Diffusion welding of SiC Fiber-reinforced Aluminum- base Alloy Composite

一项调查是由SiC纤维再增强铝基合金复合材料制成的，该复合材料是通过传统融合焊接技术进行的一种非常困难的结合。焊接用铝铜镁系列合金（2017年， 2024年合金）制成，铝5%钙合金在540 ° C至630 ° C的1x <10^（-4）> Torr。快速冷却的Al-5%钙合金箔，宽度10毫米，厚度40-50<mu>米，是由液体镶嵌制成的。从实验中，以下的结果都得到了。（1）Al-Al焊接的高粘结强度是通过使用电化学抛光获得的。（2）焊接表面上SiC纤维的投影是由电抛光引起的。投影纤维在提高张力和弯曲强度的过程中发挥了重要的作用。（3）在2017年和2024年使用FRM将Al扩散到FRM中，合金油已经在固体线上固体和液体相位共存的温度范围内被识别出来。当液体阶段的体积分数为1- 5%时，最大张力强度被增加。（4）用Al-5% Ca合金油在630 ° C的焊接温度下制成的保温材料，具有180分钟的最大张力强度。这是一个值得注意的因素，以加速SiC纤维和铝矩阵之间的接口反应。

An investigation has been made of the diffusion welding of SiC fiber-reinforced aluminum-base alloy composite which is very difficult to join by the conventional fusion-welding technique. The welding was made using Al-Cu-Mg series alloy (2017, 2024 alloy) and Al-5%Ca alloy as insert-metals at 540゜C to 630゜C in 1x <10^(-4)> Torr. The rapidly cooled Al-5%Ca alloy foil, 10 mm in width and 40-50 <mu> m thick, were produced by liquid quenching. From the experiment, the following results are obtained.(1) A higher bond strength for the Al-Al weldment is obtained by using electrolytic polishing.(2) The projection of SiC fiber on the welding surface is caused by the electrolytic polishing. The projecting fibers play an important role in improvement of tensile and bend strength of the joint.(3) Diffusion welding of Al to FRM using 2017 and 2024 alloy foils have been caried out in the temperature range above the solidus line where solid and liquid phases coexist. The maximum tensile strength was obtained when the volume fraction of the liquid phase was 1-5%.(4) The weldments made with Al-5%Ca alloy foil at the welding temperature of 630゜C for 180 min have the maximum tensile strength. This is attributable to acceleration of the interface reaction between SiC fiber and Al matrix by Ca.