3. Секція "Матеріалознавство порошкових та композиційних матеріалів і покриттів"

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About Al–Si Alloys Structure Features and Ductility and Strength Increasing after Deformation Heat Processing
(Metallophysics and Advanced Technologies 2022, vol. 44, No. 6, pp. 769–784, G. V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, 2022) V. V. Kaverinsky; Z. P. Sukhenko; G. A. Bagluk; D. G. Verbylo
A technique of deformation heat processing for Al–Si based alloys is proposed which can significantly increase their both ductility and strength and also re- veals additional reserves for their strength and hardness increasing through cold work hardening. The method includes serial of small hot plastic defor- mations with intermediate cooling and short annealing. This makes the silicon inclusion rather small with shape close to spherical, which leads to the ductil- ity increasing. Then a work hardening processing could be performed for the material. Finally, both ductility and strength appear higher than in the initial cast state.
Effect of oxidation on sliding wear behavior of NiCrSiB-TiB2 plasma sprayed coatings
(Key Engineering Materials, 2014) O. Umanskyi; I. Hussainova; M. Storozhenko; O. Terentyev; M. Antonov
The main goal of this work is to study dry sliding wear behavior of NiCrSiB-TiB2 plasma sprayed coating against NiCrSiB coating. NiCrSiB-based сomposite powders with 10, 20, 40 wt.% TiB2 particles content were deposited on steel substrates by plasma spraying. The structure of NiCrSiB-TiB2 coatings consists of Ni-based matrix and TiB2 and CrB grains. Among the coatings studied, the NiCrSiB-20wt.%TiB2 shows excellent wear-resistance. The worn surfaces were observed using scanning electron microscopy and Auger electron spectrometry analysis to determine the wear mechanisms.
EFFECT OF THE STRUCTURE OF TiB2–(Fe–Mo) PLASMA COATINGS ON MECHANICAL AND TRIBOTECHNICAL PROPERTIES
(Powder Metallurgy and Metal Ceramics, 2017) M. S. Storozhenko; A. P. Umanskii; A. E. Terentiev; I. M. Zakiev2
The structure, mechanical properties, and wear-resistance of TiB2–(Fe–Mo) plasma coatings are investigated. Composite powders in the TiB2–(Fe–Mo) system with 20, 40, 60, and 80 wt.% of the Fe–13 wt.% Mo alloy were produced by vacuum sintering with subsequent grinding. The developed powders are conglomerates that contain both refractory and metallic phases. During plasma spraying of developed coatings, a coating with heterophase structure, which consists of Fe-based metal alloy and titanium diboride grains, is formed. The effect of the microstructure of plasma-sprayed coatings on the wear-resistance under abrasive wear and dry sliding friction conditions is studied. The scratch hardness testing revealed an insufficient strength of TiB2–20 wt.% (Fe–13 wt.% Mo) coatings and their poor adhesion to the coating base, resulting in the extremely gross wear, when friction. It is found out that, due to the optimal ratio of refractory and metallic phases, the TiB2–40 wt.% (Fe–13 wt.% Mo) coating possesses high wear-resistance under abrasive wear and dry sliding friction conditions.
Exploration of Titanium-Based Fine-Particle Additive Influence on Cohesive and Adhesive Strength Enhancement in Epoxy-Polymer Composites
(PHYSICS AND CHEMISTRY OF SOLID STATE, 2024) O. Baranovska; G. Bagliuk; A. Buketov; O. Sapronov; D. Baranovskyi
The study examines how the inclusion of a dispersed powder filler affects the physico-mechanical properties of an ultrasound-modified epoxy matrix. Varying the filler content from 5 % to 60 % by weight in the composite revealed an optimal concentration for enhanced mechanical properties. Introducing the filler at 5 % led to maximum impact strength (W = 18.47 kJ/m2 ) and minimized destructive stresses during bending (σB = 51.75 MPa). At 10 % filler concentration, destructive bending stresses increased significantly from σB = 48.0 MPa to σB= 74.85 MPa, with impact strength improving from W = 7.4 kJ/m2 to W = 17.42...18.47 kJ/m2. Further increasing filler content to 20 - 60 % resulted in a slight decrease in destructive stresses while still surpassing for the filler-free epoxy matrix strength. Optimal modifier content improved adhesive characteristics, achieving a peak adhesive strength (σa = 33.4 MPa) at 20 % filler, albeit with residual stresses at 0.34 MPa. Introducing the modifier at 10% increased adhesive strength to σa = 28.6 MPa, marking a 1.15-fold improvement over the filler-free epoxy matrix, while reducing residual stresses from σres = 1.4 MPa to σres = 1.0 MPa. Higher filler content (40 - 60 %) led to decreased adhesive strength and increased residual stresses (σres = 0.62...0.69 MPa).
MATERIALS AND TECHNIQUES FOR 3D PRINTING IN UKRAINE (OVERVIEW)
(Springer Science+Business Media, LLC, 2022) O.B. Zgalat-Lozynskyy
An overview of additive manufacturing techniques in Ukraine from the end of the last century to 2021 is presented. The current state of 3D printing in Ukraine was analyzed in terms of new developments (startups), research areas, and direct implementation of additive manufacturing techniques. The main scientific and research teams that were actively engaged in the development and implementation of additive manufacturing techniques in Ukraine since the end of the 1990s were addressed. They include those involved in research of selective laser sintering for ceramic powders produced from refractory ZrO2–TiO2 and TiN–TiB2 compounds conducted at the Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, and research intended to produce 3D parts by fused deposition of metals or alloys called xBeam 3D Metal Printing conducted at the Paton Electric Welding Institute, National Academy of Sciences of Ukraine. This technique found its commercial implementation in the Chervona Hvilya PJSC startup. The paper discusses the main trends in the development of new equipment for 3D printing with ceramics, polymer/ceramic materials, and metals and alloys, as well as experiments combining different materials to achieve new properties. The latest experiments on the shape of materials are presented. They involve the formation of lattice structures that not only reduce the weight of parts but also impart properties that are comparable to those of dense materials. The main attention is paid to the overview of up-to-date capabilities and prospects for the use of additive manufacturing techniques and materials in national materials science. Attention is also focused on prospects for producing parts of complex shape for various functional purposes from ceramics, metals, and associated composites.
MICROSTRUCTURAL DESIGN OF ZrO2–Y2O3–CeO2–Al2O3 MATERIALS
(2011) E. V. Dudnik; A. V. Shevchenko; A. K. Ruban; V. P. Red’ko; L. M. Lopato
It is shown that microstructural design of ZrO2–Y2O3–CeO2–Al2O3 ceramics is based on interrelated processes in the synthesis of starting powders and their formation and sintering. Hydrothermal nanocrystalline powders are examined to establish the formation of self-reinforced and multilayer composites with high strength and bioinert implants of femoral heads resistant to ageing processes in the human body. The results serve as a scientific basis for microstructure design of fine-grained ZrO2-based composites in the ZrO2–Y2O3–CeO2–Al2O3 system with high strength and other properties.
New Powdered Nanocrystalline Soft Magnetic Composites with Portland Cement Binder
(G. V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, 2024) B. S. Baitaliuk; A. V. Nosenko; V. K. Nosenko; G. A. Bagliuk
Toroidal cores based on nanocrystalline powder Fe73Si16B7Cu1Nb3 (of Finemet type) and Portland cement ‘M-500’ as a binder are fabricated using powder metallurgy methods (where no pressing is applied). The cores exhibit reliable strength, temperature resistance up to 300°C, and excellent magnetic prop- erties. Using these composites provides lower losses and more stable frequen- cy characteristics of the cores as compared to the cores for power electronics based on carbonyl-iron powders, AlSiFe, or high-silicon electrical steel. Addi- tionally, such composites can be used for production of the devices operating at elevated temperatures, e.g., magnetic flux concentrators for induction heaters. Since these soft magnetic composites do not require pressing opera- tions, the cores’ manufacturing process is simplified significantly and ena- bles diversification of core shapes and sizes. Методами порошкової металурґії (без операції пресування) було одержано тороїдні осердя на основі порошків нанокристалічного металевого стопу MM-11Н складу Fe73Si16B7Cu1Nb3 зі зв’язкою на основі портландцементу «М-500». Такі осердя мають достатню міцність, температуростійкість до 300°С, а також відмінні магнетні властивості. Ці композити можуть замі- нити осердя для силової електроніки на основі порошків карбонільного заліза, альсиферу чи електротехнічної висококремністої криці, оскільки мають нижчі втрати та стабільніші частотні характеристики. Також такі композити можуть знаходити застосування у приладах із підвищеними температурами експлуатації, наприклад в концентраторах магнетного потоку індукційних нагрівачів. А оскільки такі магнетом’які композити не потребують операції пресування, то це значно спрощує процес вироб- ництва їх та розширює асортимент форм і розмірів таких композитів.
POLYMER MATERIALS REINFORCED WITH SILICON NITRIDE PARTICLES FOR 3D PRINTING
(Springer Science+Business Media, LLC, 2020) O.B. Zgalat-Lozynskyy; O.O. Matviichuk; O.I.Tolochyn; O.V. Ievdokymova; N.O. Zgalat-Lozynska; V.I.Zakiev3
Comprehensive research into the production of a ceramic-reinforced polymer material from highdensity polyethylene or polypropylene and -Si3N4 powder was conducted. The incorporation of silicon nitride ceramic particles (5 and 10 vol.%) into the polymers to make polymer–ceramic filaments was studied step by step. High-quality polypropylene–ceramic filaments could be obtained at an extrusion temperature of 150oC with an extrusion speed of 20 cm/min and polyethylene–ceramic filaments at 160oC and 30 cm/min. Data on the shape and size distribution of Si3N4 particles were used to simulate the elementary volume of the filaments to determine the mechanical properties of the composites applying a 2D finite-element model. The reinforcement of the polypropylene/polyethylene-matrix material by 10 vol.% Si3N4 particles was not sufficient because the composite elastic modulus increased insignificantly and the critical strain decreased substantially to incorporate a greater volume of hard particles to improve the elastic modulus. To assess the quality of the polymer–ceramic filaments, parts of different shape (washer and auger) from reinforced and unreinforced filaments were designed and printed. The printed polymer–ceramic parts demonstrated a smooth surface and had no ledges or discontinuous areas. The mechanical (Vickers and Brinell hardness) and tribological (volume wear) properties of the materials were examined. Wear tests of the polyethylene–Si3N4 composite showed that its wear resistance tended to improve with increasing ceramic content of the filament. The low abrasive wear of the Si3N4-reinforced polypropylene/polyethylene material and the behavior of ceramic particles in contact with the indenter indicate that the composite has high fracture resistance in 3D printing.
Sintered Al-Si-Ni Alloy: Structure and Properties. I. Powder Obtaining
(G. V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, 2023) G. A. Bagliuk; T. О. Monastyrska; V. V. Kaverinsky; V. P. Bevz; V. K. Nosenko; I. M. Kirian; D. L. Pakula; V. V. Kyrylchuk; A. M. Lakhnik; O. D. Rud
The work is aimed at the development of a new sintered aluminium alloy with a low temperature coefficient of linear expansion that opens fundamentally new opportunities for solving the modern needs of domestic machine- building and instrument-making enterprises in light materials with special physical properties. Phase composition, structure and properties of cast alu- minium alloys Al–Si–Ni with different contents of silicon and nickel, as well as powders obtained by grinding rapidly-quenched metal ribbons of these al- loys in a high-energy ball mill are studied using various methods of structur- al analysis. The obtained values of the coefficient of linear expansion of the studied alloys in the cast state are significantly lower than those of pure alu- minium, and they amount to ≅ (11–15)⋅10−6 K−1. The method of obtaining a powder of a rapidly-crystallized alloy by manufacturing a rapidly-quenched metal ribbons using melt spinning followed by its dispersion in a high-energy ball mill is proposed for the fabrication of finely-dispersed powder and subse- quent hot pressing. Роботу спрямовано на розробку нового спеченого алюмінійового стопу з низьким температурним коефіцієнтом лінійного розширення, що відкри- ває принципово нові можливості вирішення сучасних потреб вітчизняних підприємств машинобудування, приладобудування у легких матеріялах з особливими фізичними властивостями. З використанням різних методів структурної аналізи вивчено фазовий склад, структуру та властивості ли- тих алюмінійових стопів Al–Si–Ni з різним вмістом Силіцію та Ніклю, а також порошків, одержаних розмелюванням у високоенергетичному ку- льовому млині швидкозагартованих металевих стрічок цих стопів. Одер- жані значення коефіцієнта лінійного розширення досліджених стопів у литому стані істотно нижчі, ніж у чистого алюмінію, і становлять ≅ (11– 15)⋅10−6 К−1. Запропоновано метод одержання порошку швидкозакриста- лізованого стопу шляхом виготовлення швидкозагартованої металевої стрічки за допомогою спінінґування розтопу з подальшим її дисперґуван- ням у високоенергетичному кульовому млині для одержання дрібнодис- персного порошку та наступного гарячого пресування.
Structural and phase transformations in titanium alloys induced by ferrosilicon alloying
(BOHR Publishers PVT LTD, 2024) Oksana Baranovska; Gennadii Bagliuk; Olena Olifan; Seghii Korichev; Yaroslav Sytnyk; Ahanov Andrii
The aim of this study was to investigate the structural and phase transformations in titanium alloys induced by ferrosilicon alloying and to enhance the physical and mechanical properties of titanium-based composite materials. These findings demonstrate that the use of FS65 ferroalloy as an alloying addition leads to active interaction with titanium hydride, resulting in the formation of a complex heterophase system. Using FS65 ferroalloy, boron carbide (B4C), and carbon (C) as alloying additions, the research identifies the optimal synthesis temperature and examines the resulting microstructures and phase formations. The optimal synthesis temperature was found to be 1250◦C. At this temperature, the phases TiC, TiSi, FeTi, and Ti3SiC2 were observed in the system 65 TiH2 – 30 FeSi – 5 C (wt.%), while TiC, Ti5Si4, Fe2Ti, and TiB2 were identified in the system 65 TiH2 – 30 FeSi – 5 B4C (wt.%). The addition of 5% B4C resulted in a finer microstructure with grain sizes ranging from 0.5 to 5 μm, compared to grain sizes of 5–10 μm with the addition of 5% C. The presence of B4C also promoted the formation of TiB2. The synthesized compacts, characterized by a fine-pored, spongy structure, are easily crushed, making them suitable for use as dispersed fillers in composite materials.
Structure and Properties of TiCrFeNiC High Entropy Alloy Produced by Powder Metallurgy
(Juniper Online Journal of Material Science, 2022) Bagliuk, G.; Marich, M.; Mamonova, A.
The equiatomic high entropy TiCrFeNiC alloy was prepared by sintering or hot forging of preforms from the initial or milled powder mixtures. It is shown that sintering does not provide close to non-porous state of the sintered material. The porosity of the sintered at 1300°C samples from the initial mixture is ≈ 5%, and from milled one ≈ 9%. Minimization of porosity samples (up to 1-1.5 %) was reached only at use of hot forging of porous preforms. Sintered and hot forged alloys consist of predominant high-entropy FCC phase. Dispersed inclusion of titanium carbide particles and a small content of chromium carbide Cr₃C₂ evenly distributed in matrix phase. The hot-forged alloy has a fairly high compressive strength, reaching 2250 MPa, and a hardness of 62 HRC. The annealing after hot forging and increasing of its temperature leads to a monotonic decrease in the level of strength and hardness. Annealing as well increases the level of crack resistance of the alloy, which reaches the value of 14.3 MPa·m¹/².
STRUCTURE, PHASE COMPOSITION, AND WEAR MECHANISMS OF PLASMA-SPRAYED NiCrSiB–20 wt.% TiB2 COATING
(Powder Metallurgy and Metal Ceramics, 2015) A. P. Umanskii; M. S. Storozhenko; I. V. Hussainova; A. E. Terentiev; A. M. Kovalchenko; M. M. Antonov
The structure, phase composition, and wear mechanisms of plasma-sprayed NKhTB20 coating (NiCrSiB–20 wt.% TiB2) are studied. To produce NKhTB20 composite powder, commercial PR-NKh16SR3 (NiCrSiB) powder was mixed with 20 wt.% TiB2 and the charge was pressed and sintered in vacuum at 1100C for 30 min. During sintering, the components react to form chromium borides. The sinters were ground and classified into the particle size fraction –100+60 nm for plasma spraying. The plasma-sprayed NKhTB20 coating consists of a nickel-based matrix reinforced with titanium diboride and chromium boride grains. The friction and wear behavior of the NKhTB20 coating in dry friction against plasma-sprayed NiCrSiB and NKhTB20 coatings is examined. It is revealed that the NKhTB20/NiCrSiB friction pair has higher wear resistance than NKhTB20/NKhTB20. The contact surfaces of the NKhTB20/NKhTB20 friction pair are damaged under oxidative and abrasive wear mechanisms. Oxidative wear is the dominant mechanism for the NKhTB20/NiCrSiB friction surface. Complex oxide films form on the NKhTB20/NiCrSiB sliding surface and prevent it from damage.
Study of aluminum content on the structure and phase composition of synthesized aluminum-matrix composites
(Machines. Technologies. Materials. Vol. 17 (2023), Issue 1, pg(s) 46-49, 2023) Yevheniia Kyryliuk; Genadii Bagliuk; Stepan Kyryliuk,; Bykov Oleksandr; Yulia Shishkina
Abstract: The work shows that there is no significant change in the phase composition of composites with a change in the synthesis temperature, so we can use pre-synthesized heats at a temperature of 950 oC to obtain hot-stamped aluminum-based composites. The best characteristics of the synthesized titanium carbide were obtained for the composition 45Al-11C-44Ti (%, wt.). The lattice period of titanium carbide for this sample is 0.4324, and the particle size of titanium carbide formed after sintering is 0.8-1.5 μm. The influence of the component composition of the initial charge on the features of the structure and the phase composition of the thermally synthesized heat of the Al-C-Ti system was established.
Study of aluminum content on the structure and phase composition of synthesized aluminum-matrix composites
(Scientific Technical Union of Mechanical Engineering “Industry-4.0”, 2023) Yevheniia Kyryliuk; Genadii Bagliuk; Stepan Kyryliuk; Bykov Oleksandr; Yulia Shishkina
The work shows that there is no significant change in the phase composition of composites with a change in the synthesis temperature, so we can use pre-synthesized heats at a temperature of 950 oC to obtain hot-stamped aluminum-based composites. The best characteristics of the synthesized titanium carbide were obtained for the composition 45Al-11C-44Ti (%, wt.). The lattice period of titanium carbide for this sample is 0.4324, and the particle size of titanium carbide formed after sintering is 0.8-1.5 μm. The influence of the component composition of the initial charge on the features of the structure and the phase composition of the thermally synthesized heat of the Al-C-Ti system was established.
Synthesis and spark plasma sintering of Si3N4–ZrN self-healing composites
(2022 Elsevier Ltd., 2022) Ostap Zgalat-Lozynskyy; I. Kud; L. Ieremenko; L. Krushynska; D. Zyatkevych; K. Grinkevych; O. Myslyvchenko; V. Danylenko; S. Sokhan; A. Ragulya
A Si3N4–ZrN wear-resistant self-healing composite material was developed. Si3N4–ZrN composite ultrafine powders were synthesized at a temperature of 1200 ◦С via solid-state reactions without milling and densified by spark plasma sintering at 1650 ◦C to a relative density of 97 ± 0.5%. Balls 13.494 mm in diameter for ball bearings manufactured by spark plasma sintering had a fine-grained structure with a grain size of 200–500 nm, Vickers hardness of 22.5 ± 1.8 GPa, and indentation fracture toughness of 6.2 ± 0.4 MPa. The tribological properties of the composite were investigated under static and dynamic loading. The self-healing capability of the Si3N4–ZrN composite was evaluated in the temperature range 500–550 ◦С. High-temperature three-point bending tests of notched specimens showed a bending strength of 383 ± 21 MPa at room temperature and 413 ± 30 MPa at 500 ◦С, which confirmed the self-healing of the composite.
The influence of electrochemical corrosion on the structure and phase composition of a sintered multicomponent titanium-based composite in a 3% NaCl solution
(G. V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, 2023) Oksana Baranovska; Gennadii Bagliuk; Oleksandr Bykov; Oleksandr Hrypachevsky; Viktor Talash; Yulia Rudenko; Dmytro Baranovskyi
The electrochemical corrosion properties in a 3% NaCl solution of the titanium-based multicomponent composite of the 65TiH2– 30FeSiMn–B4C system were investigated. The kinetics and the mechanism of anode dissolution of metals and oxidation of specimens have been studied by using polarization curves, chemical and x-ray phase analyses. It was found a decrease in the titanium carbide peaks on the X-Ray defractions also the titanium silicon carbide almost disappears after immersing the sample in a 3% NaCl solution. Formation of silicon and boride phases of titanium in the synthesis process leads to an increase in corrosion resistance due to the inhibition of the velocities of both the anode and cathode processes
THE ROLE OF HAFNIUM IN MODERN THERMAL BARRIER COATINGS
(Springer Science+Business Media, LLC, 2021) S.M. Lakiza; M.I. Hrechanyuk; V.P. Red’ko; O.K. Ruban; Ja.S. Tyshchenko; A.O. Makudera; O.V. Dudnik
The world’s experience in using hafnium in two important parts of high-temperature thermal barrier coatings, such as the top thermal barrier layer and bond coat layer, was analyzed. In the top thermal barrier layer, hafnium is present as HfO2 completely or partially stabilized by yttria (or other rare- earth oxides). Another approach is to use hafnium dioxide as an addition to conventional coatings based on ZrO2 stabilized completely or partially. Electron-beam physical vapor deposition (EB- PVD) and air plasma spray process (APS) are most common techniques for applying thermal barrier coatings containing hafnium dioxide. Magnetron sputtering turned out to be successful as well. Compared to the 8YSZ coating, the 7.5YSH coating showed reduced Young’s modulus, 30% lower thermal conductivity (decreased to 0.5–1.1 W/(m · K)) at high temperatures for HfO2 stabilized with 27 wt.% Y2O3, and higher sintering resistance and heat resistance. Doping of ZrO2 and HfO2 by several stabilizers proved to be promising: specifically, doping by a mixture of one trivalent ion larger than Y3+ and another trivalent ion smaller than Y3+, preserving the metastable structure of the t phase. The importance of phase diagrams for a correct choice of the top coat composition and doping elements for the bond coat is shown. Doping the bond coat with a small amount (up to 1 wt.%) of hafnium improved its cyclic oxidation resistance and increased the adhesion of the thermally grown oxide layer to the bond coat and strength of the latter.
THERMAL BARRIER COATINGS BASED ON ZrO2 SOLID SOLUTIONS
(Springer Science and Business Media LLC, 2020) E.V. Dudnik; S.N. Lakiza; I.N. Hrechanyuk; A.K. Ruban; V.P. Redko; I.O. Marek; V.B. Shmibelsky; A.A. Makudera; N.I. Hrechanyuk
The standard material of the ceramic layer in thermal barrier coatings (TBCs)—a solid solution of ZrO2 stabilized with (6–8 wt.%) Y2O3 (YSZ)—approaches the temperature limit of its application (<1200°C) because the ZrO2 t phase sinters and undergoes t-ZrO2  T-ZrO2 + F-ZrO2 phase transformations to form M-ZrO2 at elevated temperatures. Ceramic materials for a new generation of TBCs need to be developed to increase the operating temperature (up to 1600°C), efficiency, and productivity of gas-turbine engines. The overview paper analyzes research efforts focusing on the development of TBCs using solid solutions of ZrO2 with rare-earth metal and titanium oxides. When Y2O3 in YSZ is partially substituted by CeO2, TiO2, La2O3, Sc2O3, Gd2O3, Nd2O3, Yb2O3, Er2O3, and Ta2O5, ceramics with high phase stability (ZrO2 t phase being retained in the coating) up to 1500°C, lower thermal conductivity, and required fracture toughness and sintering resistance but shorter thermal fatigue life than that of standard YSZ are produced. The concepts of greater tetragonality of the ZrO2 t phase (ceramics in the ZrO2–CeO2–TiO2 system) and a 'multicomponent defective cluster' (ceramics in the ZrO2–Y2O3–Nd2O3 (Gd2O3, Sm2O3)–Yb2O3 (Sc2O3) system) explain how the operating temperature of the TBC ceramic layer increases to 1350oC and 1600oC, respectively. The thermal conductivity of TBC ceramics in the binary ZrO2–CeO2, ZrO2–Er2O3, ZrO2–Sm2O3, ZrO2–Nd2O3, ZrO2–Gd2O3, ZrO2–Dy2O3, and ZrO2–Yb2O3 systems is lower than that of YSZ. Ceramics with high phase stability and low thermal conductivity have been produced in the ternary ZrO2–Sc2O3–Gd2O3, ZrO2–CeO2–Gd2O3, ZrO2–YbO1.5–TaO2.5, and ZrO2–Yb2O3–TiO2 systems. An integrated approach is needed to choose the composition of the ceramic layer based on the ZrO2 solid solution, select the coating technique, and improve the coating architecture to design effective TBCs with balanced properties.
THERMAL BARRIER COATINGS: CURRENT STATUS, SEARCH, AND ANALYSIS
(1068-1302/18/0102-0082 2018 Springer Science+Business Media, LLC, 2018) S. M. Lakiza; M. I. Grechanyuk; O. K. Ruban; V. P. Redko; M. S. Glabay; O. B. Myloserdov; O. V. Dudnik; S. V. Prokhorenko
The principles for selecting materials to be used as thermal barrier coatings (TBCs) are presented. The advantages and disadvantages of new methods for TBC deposition are briefly described. After measurement of the thermal conductivity and thermal expansion coefficient, it is required to ascertain that such materials do not interact with the thermally grown aluminum oxide and then to determine their strength, fracture toughness, hardness, and Young’s modulus. The thermal conductivity of TBC can be reduced by increasing its porosity and suppressing its sintering. The need for and drawbacks of multilayer coatings are shown. If TBC meets all the requirements, then TBC corrosion resistance to Na2SO4, V2O5, P2O5, sand, and volcanic ash in operation and ways to protect TBC against damage need to be determined. The prospects and areas for development of these techniques are outlined.
Tribological properties of epoxy matrix composites filled with particles of multicomponent titanium-based alloy
(Journal of Materials Science: Materials in Engineering, 2025) Bagliuk, Gennadii; Baranovska, Oksana; Varchenko, Viktor; Buketov, Andriy; Sapronov, Oleksandr; Ivanchenko, Serhii
The article presents the results of a study on the effect of a dispersed filler, produced by thermal synthesis from a mixture of titanium hydride, ferrosilicomanganese, and boron carbide powders, on the tribological characteristics of a polymer composite based on ED-20 epoxy diane oligomer. The filler was incorporated into the resin at concentrations ranging from 5 to 40 parts per 100 parts (by weight) of the epoxy oligomer. The study examines the friction coefficient and wear behavior of these composites under different conditions, demonstrating the effect of filler content on tribological performance.