Microstructure and Mechanical Property of the ZrB₂-Based Ultra-High-Temperature Ceramic Composites Brazed Joint

Abstract

ZrB2-SiC ceramic composites was brazed by using Ti-Zr-Ni-Cu active filler in a vacuum furnace. The microstructure and interfacial phenomena of the joints were analyzed by means of SEM, EDS and XRD. The joining effect was evaluated by shear strength. The results showed that the reaction products of the ZrB2-SiC ceramic composites joint brazed with Ti-Zr-Ni-Cu active filler were TiC, ZrC, Ti5Si3, Zr2Si, Zr(s,s) and (Ti, Zr)2 (Ni, Cu). The maximum shear strength of the ZrB2-based ultra-high-temperature ceramic composites brazed joints is 143.5 Subscript textMPa at brazing temperature T=920°C and holding time t=10min.

Evaluation of Amorphous Ti Brazes to Join Zirconium Diboride‐Based Ultra‐High‐Temperature Ceramics to Metallic Systems

“…Additives to these diborides, such as SiC and carbon, improve the thermal and mechanical properties, and oxidation resistance. The diboride‐based ceramics have been characterized for physical, mechanical, thermal, and thermomechanical properties and evaluated for performance under harsh conditions, including degradation of strength at elevated temperatures . In most applications, components made out of UHTC may need to be joined to diverse materials, including high‐temperature metallic alloys, especially in situations where the UHTC‐to‐metal joint lies outside the hottest zone and may be amenable to external cooling.…”