Joining of SiO₂–BN ceramic to Nb using a CNT-reinforced brazing alloy

Abstract

CNTs played a key role in reducing the residual stress and reinforcing the mechanical properties (at both room and high temperatures) of the brazed joint.

Effect of the BN content on the thermal shock resistance and properties of BN/SiO2 composites fabricated from mechanically alloyed SiBON powders

“…[1][2][3] Among the various structural materials, h-BN ceramics with high melting points (>3000 C), high refractoriness, good ablation resistance, low dielectric coefficient and loss tangent (5.16 and 10-11 Â 10 À4 , respectively, at room temperature), excellent thermal shock resistance, and good machinability [4][5][6] are suggested to be a suitable candidate for antenna and radome window materials on carrier-rockets, airships and missiles. 7,8 However, the poor sinterability and mechanical properties as well as weak oxidation resistance have limited the application of single-phase h-BN materials. Hence, improvements in the sinterability and mechanical properties of hexagonal boron nitride have been the main issues in the past decades.…”