Microstructure and Mechanical Properties of Joints in Sintered SiC Fiber-Bonded Ceramics

摘要

Active metal brazing of a new high thermal conductivity SiC-polycrystalline fiber-bonded ceramic (SA-Tyrannohex?) has been conducted using a Ti-containing Ag-Cu active braze alloy (Ticusil?). The brazed joints were characterized using SEM-EDS and Knoop hardness scans across the interfaces. The effects of fiber orientation in the composite on the microstructure, elemental composition, and microhardness are presented. Results show that this material can be successfully joined using judiciously selected off-the shelf active braze alloys to yield metallurgically sound joints possessing high integrity.