Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8044050 | Vacuum | 2018 | 32 Pages |
Abstract
Carbon fiber reinforced carbon matrix (Cf/C) composite and Ni base superalloy were brazed in vacuum using MBF 20 filler. By varying brazing temperatures and holding times, the effects of brazing parameters on the microstructure as well as its evolution and mechanical properties of the joints were investigated. The results show that the microstructural evolution of joints experiences three stages. With the rising of brazing process parameters, the dissolution of Cf/C turns strong, leading to the formation of rough composite/filler interface and the increasing of amount of Cr7C3 and MC complex metal carbides. The residual stress concentration in joint changes consequently. The maximum shear strength of the joint can reach 35â¯MPa (which is up to 92% of the shear strength of Cf/C substrate), 15â¯MPa and 9â¯MPaâ¯at room temperature, 800â¯Â°C and 1000â¯Â°C, respectively. The fracture initiates and propagates in Cf/C composite.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
J.M. Shi, L.X. Zhang, X.Y. Tian, H.W. Li, J.C. Feng,