Effect of Joining Temperature on Microstructure and Properties of SiC Joints by Air Brazing Process with Al
The effect of the joining temperature on the microstructure and properties of the SiC joint joined by using Al foil as an interlayer under air atmosphere was investigated.The results show that the loss of metal Al at the high temperature of 1000℃can cause the formation of pores in the interlayer of the SiC joint.Under the same heating treatment process,reducing the joining temperature to 900℃can not only avoid the generation of pores defects in the connection layer,but also can effectively promote the complete conversion of the middle layer Al to Al2O3.Compared with the SiC joint joined at 1000℃,the room temperature shear strength of the SiC joint joined at 900℃is improved from(22.0±5.4)MPa to(117.0±18.7)MPa.
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