Abstract
Abstract It is needed to join C/C composite to other materials since its individual use is limited. Brazing is a method to join C/C composite that has been studied most, maturest and most widely used in recent decades. The quality of a brazed joint is largely determined by the intermediate layer material. It is significant to choose filler materials reasonably. C/C composite is difficult to be wetted by common brazing filler materials. Moreover, there is a large difference in the coefficient of thermal expansion between C/C composite and metals. At present, there is no brazing filler alloy exclusively recommended for commercial C/C composites and metal brazing. Usually, active elements are added into filler metals to improve the wettability of them on C/C composite surface. The existing research includes Al-based, Ag-based, Cu-based, Ti-based, Ni-based brazing filler metals, and so on. In addition, various particle reinforced composite filler materials and stress buffer metal interlayer added composite filler materials have been studied for brazing C/C composite. The summarization of the overview on the application of intermediate filler metals is made in this paper. The basic reference basis is provided for the subsequent brazing filler metals development and joint performance improvement for C/C composite brazing.
Highlights
It is needed to join C/C composite to other materials since its individual use is limited
In order to improve the wettability of brazing filler metals on C/C composites, active metal elements such as Ti, Cr and V which can react with C to form carbide are generally added to brazing filler metals, such as Al-Ti, Ag-Cu-Ti, Cu-Ti, Cu-Cr, Ni-Ti, Ni-Cr-P, Ni-Cr-Si-B brazing filler metals mentioned above
The active metal can react with C in the brazing process to generate carbide reaction layer, and the metallurgical bonding formed at the joint improves the joint strength
Summary
Abstract: It is needed to join C/C composite to other materials since its individual use is limited. Brazing is a method to join C/C composite that has been studied most, maturest and most widely used in recent decades. The quality of a brazed joint is largely determined by the intermediate layer material. Carbon fiber reinforced carbon matrix composite, known as carbon/carbon composite (C/C composite) is a new composite material with both functional and structural properties It is characterized by low density, high specific strength, high specific stiffness, high specific modulus, good thermal conductivity, good fracture toughness, good ablation resistance, good thermal shock resistance, excellent friction and wear resistance, good fatigue resistance and corrosion resistance, etc. The properties of brazing joints are related to the composition of joint products, the structure of compounds, the structure of matrix material interface, and difference of thermal expansion coefficient of brazed parts. The basic reference basis is provided for the subsequent brazing filler metals development and joint performance improvement for C/C composite brazing
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