Joining of C_f/SiC composite to Ti alloy using composite filler materials

Abstract

Cf/SiC was successfully joined to Ti alloy with Ag–Cu–Ti–W, Ag–Cu–Ti–SiC and Ag–Cu–Ti–TiC mixed powders by some suitable brazing parameters. Microstructure and shear strengths of the preformed joint were investigated. The results showed that the W particulate and reaction products can uniformly distribute in the brazing layer of the performed joint. These composite brazing layers relaxed the thermal stress of the joint effectively. These characteristics were beneficial to the joint, which had shear strengths that were significantly higher than the optimal shear strengths of the joint brazed with pure Ag–Cu–Ti at room temperature and 500°C.

Improving the strength of brazed joints with in situ synthesized TiB whiskers

“…However, the quality of brazed joint is degraded by residual stress due to coefficient of thermal expansion (CTE) mismatch between metals and ceramics, and between brazing alloys and ceramics [2]. To solve this problem, low CTE materials (SiC [3][4][5], Al 2 O 3 [6], TiC [3,7,8]) have been added into brazing filler alloy. However, direct addition method has many intrinsic limitations.…”

Flash joining of conductive ceramics in a few seconds by flash spark plasma sintering

“…The SEM micrographs in Figure 7 reveal that the joint region is highly defective for the lowest treatment time, 6 s, whereas the joint appears well developed with increasing processing times up to 10 s. A thin interlayer originated from the pyrolysis of the pre-ceramic resin can be identified in the latter sample, as shown in the micrographs obtained using the backscattered electron detector in Figure 7. Thus, an effective joint can be obtained in a few seconds without the need of a metallic interlayer, which is commonly used when processing this material [59][60][61][62].…”

Microstructural investigation of in situ TiB whiskers array reinforced ZrB2–SiC joint

“…In order to overcome this problem, some low CTE materials (such as SiC [7][8][9], Al 2 O 3 [10], TiC [11]) have been incorporated in the brazing alloy. However, direct addition has its intrinsic limitations, such as inhomogeneous distribution, poor wettability, etc.…”