Microstructures and mechanical properties of C_f/LAS composite and Ti60 alloy joints brazed with TiZrNiCu + C_f mixed powders

Abstract

In this paper, carbon fiber reinforced lithium aluminosilicate (LAS) glass‐ceramics matrix composites (Cf/LAS composites) are joined to Ti60 alloy using TiZrNiCu + Cf mixed powders by proper process parameters. The carbon fibers distribute uniformly in the brazing interlayer and react with Ti, Zr elements in the brazing alloy to form (Ti, Zr)C thin reactive layers, which are between the carbon fibers and the Ti, Zr elements. The effect of Cf content on the mechanical properties and microstructure of brazed joints are investigated. The microstructure of brazed joints varied obviously with the increasing of Cf content. The thickness of reactive layer between interlayer and Cf/LAS composites and Ti solid solution (Ti (s.s)) decrease gradually, and the volume of eutectic structure (Ti(s,s) + (Ti,Zr)2(Ni,Cu)) decrease gradually. The obtained brazed joints exhibit a maximum shear strength of 73.5 MPa at room temperature using TiZrNiCu + 0.3 wt% Cf mixed powders. The enhanced shear strength can be attributed to the reduction in thermal stress and the reinforcing effect originated from the carbon fiber addition.

Lithium aluminosilicate (LAS) glass-ceramics: a review of recent progress

“…The increase in shear strength from 47.3 MPa to 73.5 MPa was reported with the 0.3% addition of C f filler in braze alloy powder. The increase in the joint strength was ascribed to the crack propagation through the composite interlayer instead of interface near the C f [288].…”

Brazing of SiC ceramics pretreated by chromium coating using inactive AgCu filler metal

“…Many methods, such as adhesive joining, 4 solid‐state bonding, 5 and brazing, 6‐9 have been developed for joining ceramics to itself or metals (alloys). Among these methods, brazing is suitable to obtain reliable ceramics/ceramics (or metal) metallurgical joints due to its simplicity, convenience, low cost, and high joint strength 10‐12 …”

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