2024 Powder Metallurgy World Congress & Exhibition

Presentation information

General Sessions (Oral) » T14 High Temperature Materials

[T14] High Temperature Materials

Oral

Tue. Oct 15, 2024 10:30 AM - 12:00 PM Room F (3F 315, Conference Center)

Chairpersons: Miki Inada (Kyushu University, Japan), Akira Kishimoto (Okayama University, Japan)

10:30 AM - 11:00 AM

[15F-T14-05] Keynote: Deformation-Resistant Multipurpose Ultra-High Temperature Ceramics with Superior Hardness, Toughness, and Flexural Strength

*O. Vasylkiv1 (1.National Institute for Materials Science, Japan)

Keywords:SPS, Deformation resistance, UHTC

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.