Microstructure, mechanical properties and ablation behavior of ultra-high-temperature Ta-Hf-C solid solution coating prepared by a step-by-step plasma solid solution method

Tan, Zhenyu; Zhu, Wang; Yang, Li; Zhou, Yue; Wu, Qian; Gong, Lunjun

doi:10.1016/j.surfcoat.2020.126405

Cited by 23 publications

(11 citation statements)

References 26 publications

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“…Even so, the H V of this sample is also close to the highest hardness of the sintered HfC sample obtained by other methods. More importantly, the corresponding K IC is unexpectedly high (approximately 7.5 MPa·m 1/2 ), which is almost twice that of previously reported data. − A comparison of the Vickers hardness and fracture toughness of the HPHT-consolidated HfC samples with those from different sintering methods is shown in Figure e,f. As the consolidation temperature is increased from 1100 to 1700 °C, the Vickers hardness increases rapidly from 18.3 to 25.8 GPa.…”

Section: Resultssupporting

confidence: 47%

Achieving Dislocation Strengthening in Hafnium Carbide through High Pressure and High Temperature

et al. 2021

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Dislocations profoundly impact the mechanical behavior of materials. High dislocation density induced strengthening is easily achieved in metallic materials, but it is a challenge in ceramics. Here, we highlight the dislocation engineering of an ultrahigh-temperature ceramic, hafnium carbide (HfC), by high-pressure and high-temperature (HPHT) consolidation. The microstructure and temperature-dependent high-pressure consolidation behaviors were systematically investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Our results reveal that pressure-induced intergranular strains promote the generation of high-density dislocations in multiple orientations near grain boundaries and finally enhance the hardness and oxidation resistance of the HfC ceramic. These findings elucidate that dislocation strengthening can be achieved in ultra-high-temperature ceramic HfC, which offers crucial insights for the design and synthesis of advanced ceramic materials.

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Section: Resultssupporting

confidence: 47%

Achieving Dislocation Strengthening in Hafnium Carbide through High Pressure and High Temperature

et al. 2021

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“…The large standard deviations of the values are associated with heterogeneity of the coating, the presence of pores and structural defects. [23] However, the obtained values are sufficiently larger than the hardness of the copper substrate H V = 1.4 GPa. The obtained nanohardness of the HfTa 2 C 3 coating is comparable with the hardness of pure hafnium and tantalum carbides (11-15 GPa [30,31] ) and of HfTaC 2 , which equals 20-28 GPa.…”

Section: Experimental Synthesismentioning

confidence: 75%

“…Changes in the stoichiometry of ternary Hf x Ta y C z compounds are probable because of a wide area of homogeneity of the cubic carbide phases in the HfTaC system: HfC and TaC have the same NaCl-type crystal structure and can form infinite HfTaC solid solutions in the whole range of compositions. [23] The obtained values of the lattice constant a show that the plasma dynamic synthesis makes it possible to produce not only the well-known HfC, TaC, and HfTaC 2 compounds, but also specific and hypothetical Hf 9 TaC 10 , Hf 7 TaC 8 , Hf 6 TaC 6 , Hf 3 TaC 4 , Hf 4 Ta 3 C 6 , HfTa 2 C 3 , and HfTa 7 C 8 having a cubic structure. Hf 7 TaC 6 , Hf 4 Ta 3 C 6 , HfTa 2 C 3 , and HfTa 7 C 8 were predicted for the first time, while other compounds have recently been computationally predicted.…”

Section: Experimental Synthesismentioning

confidence: 79%

“…The obtained nanohardness of the HfTa 2 C 3 coating is comparable with the hardness of pure hafnium and tantalum carbides (11-15 GPa [30,31] ) and of HfTaC 2 , which equals 20-28 GPa. [23,30] High values of hardness of the synthesized coatings result from the reaction of TaC with HfC in the solution that involves the mutual substitution of the Hf and Ta atoms in the crystal lattice, which is similar to the mechanism of solid solution hardening in alloys. [32] Formation of a hard coating makes it possible to harden metal substrate surfaces and increase their wear resistance.…”

Section: Experimental Synthesismentioning

confidence: 85%

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Large‐Scale Synthesis and Applications of Hafnium–Tantalum Carbides

Kvashnin

Никитин

Shanenkov

et al. 2022

Adv Funct Materials

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Comprehensive theoretical and experimental studies are performed to discover a new way of synthesis of HfTaC coatings. Here, an evolutionary search for stable crystal structures in the ternary HfTaC system with subsequent selective large‐scale experimental synthesis of coatings using a unique plasma dynamic experimental setup is performed. Optimization of the experimental process allows us to perform selective synthesis of coatings made of hafnium–tantalum carbides with predefined stoichiometry, crystal structure, and properties. Along with more than 70 compounds, the HfTaC system belongs to ternary and quaternary carbides of group IV and V transition metals, and this study opens the door to synthesis of a large number of functional coatings composed of other carbides including high‐entropy carbides.

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“…Binary carbides TaC and HfC are one of the potential candidate coating materials for high wear parts such as high temperature bearings and tools [1,2]. The attractive thing is that ternary Ta-Hf-C solid solution ceramics formed by TaC and HfC have been proven to have the higher hardness (~30 GPa) and the highest melting point temperature (>4200 K) from experimental and computational studies, which has been incorporated into the surface engineering wear-resistant material [3][4][5]. Many methods have been developed for the synthesis of Ta-Hf-C solid solution coatings, including plasma spraying, chemical vapor deposition, and physical vapor deposition [6,7].…”

Section: Introductionmentioning

confidence: 99%

Structure, Mechanical, and Micro-Scratch Behavior of Ta-Hf-C Solid Solution Coating Deposited by Non-Reactive Magnetron Sputtering

Tan

Guo

et al. 2022

Materials

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The TaC, HfC, and Hf-Ta-C coatings are successfully prepared by non-reactively DC magnetron sputtering. The effects of working pressure and deposition temperature on the structure and mechanical properties of Ta-Hf-C coating are analyzed. The scratch performance of the Ta-Hf-C coating deposited on 304 stainless steel and tungsten substrates are investigated. Results show the hardness and elastic modulus of Ta-Hf-C solid solution coating both increase to 37.8 ± 1.1 GPa and 435.8 ± 13.8 GPa due to the solid solution strengthening effect. Plastic deformation resistance H3/E2 of Ta-Hf-C coating can reach 0.285, which is more than twice that of binary coating. Furthermore, the scratch performance and failure mechanism show that Ta-Hf-C coating has a weaker plastic deformation resistance on soft substrate and low friction characteristic (0.01) on hard substrate, which implies that Ta-Hf-C coating is a good protective coating that can be applied to cutting tools.

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Microstructure, mechanical properties and ablation behavior of ultra-high-temperature Ta-Hf-C solid solution coating prepared by a step-by-step plasma solid solution method

Cited by 23 publications

References 26 publications

Achieving Dislocation Strengthening in Hafnium Carbide through High Pressure and High Temperature

Achieving Dislocation Strengthening in Hafnium Carbide through High Pressure and High Temperature

Large‐Scale Synthesis and Applications of Hafnium–Tantalum Carbides

Structure, Mechanical, and Micro-Scratch Behavior of Ta-Hf-C Solid Solution Coating Deposited by Non-Reactive Magnetron Sputtering

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