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Brazing of C/SiC Composites to TC4 Alloys

Author: DongZhenHua
Tutor: FengJiCai；ZhangLiXia
School: Harbin Institute of Technology
Course: Materials Processing Engineering
Keywords: Vacuum brazing . C / SiC composites TC4 Interface structure Shear Strength
CLC: TG454
Type: Master's thesis
Year: 2008
Downloads: 70
Quote: 2
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Abstract


C / SiC composite as a new material, fully combines the advantages of carbon fibers and SiC matrix, showing a low density, high strength, high temperature, ablation resistance, anti-erosion, etc., in the aerospace and automotive sector has a broad application prospects. Using the amorphous TiZrNiCu foil and Ni foil C / SiC composite and TC4 alloy successful connection to determine the two connector interface structure, process parameters on the joint organization, the solution clear interface connection mechanism; tested the connector at room temperature and high temperature mechanical properties, determine the path of the joint fracture process parameters - interface structure - the relationship between the mechanical properties. By C / SiC composites / TiZrNiCu/TC4 alloy connector interface reaction test and analysis results to determine the the brazing temperature T = 900 ° C, holding time t = 10min, connector interface structure: C / SiC composites / Ti5Si3 TiC ZrC / (Ti2Cu TiCu CuZr) / [Ti (ss) (Ti2Cu TiCu CuZr)] / TC4; When the brazing temperature was raised to 960 ° C, the Ti5Si3 and ZrC compounds of disappear. To evaluate the shear strength of C / SiC composites / TiZrNiCu/TC4 of the mechanical properties of the alloy joints, T = 960 ° C, t = 10min, the joint shear strength up to 99MPa; connector near the C / SiC composites TiC reaction layer of the side of the compound layer with of TiCu Ti2Cu CuZr fracture. 960 ° C / 10min connector in the 600 ° C, 800 ° C high temperature shear strength of 59MPa and 54MPa, respectively. Ni foil as an intermediate layer, T = 1000 ° C, t = 30 when the connector interface structure: C / SiC composite from materials / TiC/Ti2Ni / [Ti2Ni Ti (ss)] / TC4. Increased brazing temperature or holding time, shear strength growth decreasing trend. When T = 1100 ℃ / t = 30min when the highest joint shear strength of 128MPa; connector TiC reaction layer close to the C / SiC composite side and the brazing seam Ti2Ni Ti (ss) layer fracture. 1100 ° C / 30 min joints at 600 ° C high temperature shear strength to 120MPa and 800 ° C high temperature shear strength of 78MPa. Marc finite element analysis software, the residual stress of the two connectors, the two connectors is substantially the same as the residual stress distribution, the residual stress peak appears in the brazing filler metal layer and at the interface of the composite material, and in the presence of sharp corners a certain degree of stress concentration. Alloy joints of C / SiC composites / TiZrNiCu/TC4 of residual stress peak up to 340MPa, C / SiC composite material / Ni/TC4 of the peak of the alloy joints only 150 MPa, and the same area of ??the residual stress value of the former, resulting in the former The joint strength is low.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Brazing
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