An effective strategy towards construction of CVD SiC fiber-reinforced superalloy matrix composite

• 作者: Haoqiang Zhang Lin Liu Zhiliang Pei Nanlin Shi Jun Gong Chao Sun
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（14）
• 页码范围: 179-185
• 页数: 7页
• 语种: 英文

摘要

In this work,a modified approach for preparing CVD SiC fiber-reinforced superalloy matrix composites was rationally developed.The composites were fabricated by vacuum hot pressing (VHP) process using precursor wires coated with (Al + Al2O3) diffusion barrier layers and GH4169 superalloy coatings.BNi-7 brazing filler metals were introduced on the surface of precursor wires in order to decrease the temper-ature of the VHP process.It was found that the VHP temperature was reduced by about 100℃,and the melting,diffusion,nucleation and growth processes of BNi-7 fillers at 900 ℃ motivated the recrystalliza-tion and plastic flow of the matrix under the increasing pressure,thereby a compact composite composed of intact SiC fibers and fine equiaxial grain structure superalloy matrix was achieved.Meanwhile,the ele-ments were distributed homogeneously among the fibers in the composite and no interfacial reactions occurred.This method provides a new insight for designing and manufacturing high-quality composites in practical engineering.