A powder metallurgy route to fabricate CNT-reinforced molybdenum-hafnium-carbon composites

Wei, Yong; Luo, Lei; Liu, Huai-Bing; Zan, Xiang; Song, Jiupeng; Xu, Qiu; Zhu, Te; Wu, Yucheng

doi:10.1016/j.matdes.2020.108635

Cited by 17 publications

(4 citation statements)

References 40 publications

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“…For the sintering temperature of 1600 • C, a network-like grain structure was observed on the fracture surface of the TZC side [36] and the grains were well refined. In addition, by conducting a comparative analysis between the tensile fracture behaviors of TZC material at room temperature and 500 • C, it can be observed that the size of grains in the TZC reduced significantly when temperature increased from room temperature to 500 • C. The reduction in grain size at higher temperature can be attributed to the doping of CNTs, which can increase the short-range order of the joint and refine the grain structure, and thus lead to a higher tensile strength [37]. Compared to the room temperature case, the ODS-W side had a diverse fracture mode.…”

Section: Mechanical Performancementioning

confidence: 99%

Study on Microstructure, Mechanical Performance and Thermal Shock Resistance of Diffusion Welded Joint of ODS-W and TZC Alloy

Liu,

Zhou,

et al. 2023

Metals

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The diffusion welded joint of oxide dispersion strengthened tungsten (ODS-W) and Mo-Ti-Zr-C alloy (TZC) was successfully fabricated with the use of spark plasma sintering (SPS) at a vacuum level of 10 Pa. This study systematically investigates the microstructure, mechanical performance, and thermal shock resistance of the ODS-W/TZC connector at four different temperatures, ranging from 1300 to 1600 °C. The diffusion distance between the W and Mo atoms at the interface of ODS-W/TZC joint raises as the sintering temperature increases, with a maximum diffusion distance of up to 2 μm at 1500 °C, but then slightly decreases at 1600 °C. The ODS-W/TZC connector bonded at 1500 °C exhibits the best tensile performance, with tensile strengths of 459 MPa and 786 MPa at room temperature and 500 °C, respectively. A maximum hardness of 446 HV is obtained at the interface when the sample is sintered at 1600 °C. Thermal shock tests are conducted on the surface and interface of the ODS-W/TZC connector sintered at various temperatures. ODS-W/TZC samples prepared below 1500 °C were severely damaged, leading to exfoliation after laser thermal shock, while samples prepared above 1500 °C produced fewer damage cracks. Confocal laser scanning microscope (CLSM) analysis demonstrated that the ODS-W/TZC joint fabricated at 1500 °C exhibited substantially reduced height perturbation of both its surface and interface compared to that of ODS-W, providing evidence for its superior thermal shock resistance.

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Section: Mechanical Performancementioning

confidence: 99%

Study on Microstructure, Mechanical Performance and Thermal Shock Resistance of Diffusion Welded Joint of ODS-W and TZC Alloy

Liu,

Zhou,

et al. 2023

Metals

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“…The increase in hardness is attributed to the finer grain size and higher relative density of the composites under higher sintering conditions. The increase in fracture toughness is attributed to the improved microstructure and mechanical properties of the composites under higher sintering conditions [33][34][35][36].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Enhanced Sintering Performance of Ceramic Composites Fabricated by Powder Metallurgy

Bopanna,

Durga,

Singh

et al. 2023

E3S Web Conf.

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In this study, we investigate the enhanced sintering performance of ceramic composites fabricated by powder metallurgy. The sintering process is a critical step in the production of ceramic composites, as it significantly affects the microstructure, mechanical properties, and overall performance of the final product. We employed a novel approach to optimize the sintering parameters, including temperature, pressure, and time, to achieve a uniform and dense microstructure with minimal porosity. The ceramic composites were fabricated using a mixture of alumina (Al2O3) and zirconia (ZrO2) powders, which were ball-milled to achieve a fine particle size distribution. The powders were then compacted and sintered under various conditions to study the effects of sintering parameters on the microstructure and mechanical properties of the composites. The results showed that the optimized sintering conditions led to a significant improvement in the density, hardness, and fracture toughness of the ceramic composites. The microstructure analysis revealed a uniform distribution of the ceramic phases and a reduction in the grain size, which contributed to the enhanced mechanical properties. The findings of this study provide valuable insights into the sintering process of ceramic composites and pave the way for the development of high-performance ceramic materials for various applications, including aerospace, automotive, and biomedical industries.

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“…Yong Wei et al [ 13 ] prepared CNTs/HfH 2 -strengthened HfC-doped molybdenum (Mo-Hf-C; MHC) alloys by a powder metallurgy process. Through dispersion strengthening, grain refinement, lattice distortion, and purification of free oxygen, the relative density, microstructure, and mechanical properties were improved.…”

Section: Introductionmentioning

confidence: 99%

Preparation of an MHC Alloy by Direct Doping of HfC and Its High Temperature Oxidation and Volatilization Behavior

et al. 2022

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An HfC-doped molybdenum (Mo-Hf-C; MHC) alloy was prepared via a powder metallurgy process, including dry direct doping followed by ball-milling, cold-isotactic-pressing, and vacuum sintering. An oxidation comparison experiment was conducted, and the oxidation and volatilization behaviors were analyzed using the mass change, volatile generation rate, and morphology transformation. The results show that relatively uniform powder morphology can be obtained by the direct doping of carbide and high-energy ball milling. The oxidation of the MHC alloy at a lower temperature was characterized by the oxygen-absorption and a slight weight gain, while at a higher temperature and longer holding time, it was characterized by the mass volatile weight loss. A significant weight change appeared at 800 °C for 30 min with a weight loss rate of 4.8%. Surface oxidation products developed horizontally from ridged oxides at lower temperature stages to a flaky oxide layer at higher temperatures. The peeling of the oxide layer was the result of interfacial pore development, which led to exposure of the alloy matrix and further oxidation. Based on the oxidation and volatilization characteristics of HfC-doped MHC alloys, we conclude that the oxidation and volatilization of the MHC alloy conformed to the general law; however, the significant weight loss temperature, weight loss rate, volatilization temperature, and volatilization rate were improved compared with pure molybdenum and traditional molybdenum alloys, thus, indicating that the precipitation of the second phase HfC particles at the grain boundaries and within the grains can inhibit the oxidation and volatilization of matrix elements to a certain extent.

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A powder metallurgy route to fabricate CNT-reinforced molybdenum-hafnium-carbon composites

Cited by 17 publications

References 40 publications

Study on Microstructure, Mechanical Performance and Thermal Shock Resistance of Diffusion Welded Joint of ODS-W and TZC Alloy

Study on Microstructure, Mechanical Performance and Thermal Shock Resistance of Diffusion Welded Joint of ODS-W and TZC Alloy

Enhanced Sintering Performance of Ceramic Composites Fabricated by Powder Metallurgy

Preparation of an MHC Alloy by Direct Doping of HfC and Its High Temperature Oxidation and Volatilization Behavior

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