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Description:

The request for new multipurpose ultra-high temperature transition-metal carbide and boride ceramics causes the worldwide demand for a new class of composites with sufficient balance of high toughness, hardness, and superior flexural strength up to 2000°C. Deformation resistivity of reaction-driven SPSed boron carbide, TiB2 with stiff skeleton of B4C, Ta0.2Hf0.8C, Zr-Ta boride composite with artificially created hierarchical superstructure, tantalum mono-boride, medium-entropy Zr-Ta-Nb diboride, and TaB2-ZrB2-TiB2-HfB2 to be addressed. With RT to 1800 °C mean strength of 650 MPa, boron carbide exhibits ultrahigh flexural strength far exceeding 1000 MPa accompanied by a change in the deformation mechanism from brittle fracture to plastic deformation at 2000 °C. Ultra-strength of boron carbide through the mechanism of ultra-high temperature flexure & strain-driven amorphization to be discussed.

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• In Copyright
  

Keyword: Deformation-resistant ceramic, UHTC, Mechanical properties

Conference: World PM2024 Powder Metallurgy World Congress & Exhibition (2024-10-13 - 2024-10-17)

Funding:

• NIMS AB3080 (多結晶光学材料 革新的光材料創出のための基盤研究)
• JSPS 24K08035 (KAKENHI 非晶質相形成による超高温セラミックスの高機能化に向けたマルチスケール研究)

Manuscript type: Not a journal article

MDR DOI: https://doi.org/10.48505/nims.4980

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Updated at: 2024-11-21 16:35:37 +0900

Published on MDR: 2024-11-21 16:35:37 +0900