SiC_p/2024Al铝基复合材料表面颗粒暴露及真空钎焊分析

Analysis on SiC_p/2024 aluminum matrix composites surface reinforcements exposing and vacuum brazing

采用复合材料表面颗粒暴露及表面合金化工艺,利用M6和BAI88S i钎料对S iCp/2024A l铝基复合材料进行钎焊试验,并进行金相分析、拉伸试验和X射线衍射试验。结果表明:采用(NaOH+HNO3)工艺能将复合材料表面颗粒部分暴露出来;采用表面沉积Cu,使用M6钎料,能改善钎缝的结合状态;钎缝与铝基复合材料间无明显界限,结合良好,并形成了有S iC颗粒增强的复合钎缝,S iC颗粒在钎缝中无团聚现象;钎焊接头强度能达到202 MPa;在钎缝中无A l4C3脆性相生成。

Using the particle exposing and surface alloying technique of aluminum matrix composite,taking M6 and BAI88Si as the filler metal,the SiCp/2024Al aluminum matrix composite was brazed.The metallographic analysis,tensile test and X-ray diffraction experiment were done.The test results indicate that the surface reinforcements are partly exposed by（NaOH＋HNO3） solution.The brazing joint combination state could be improved by depositing Cu element with M6 filler metal.The brazing joint and the base metal combined well with no obvious boundary.The reinforced composite solder joints with SiC particle are formed.There is no SiC particle agglomerated in the brazing joint.The tensile strength of the welded joint can reach 202 MPa.There is no Al4C3 brittleness phase formed in the brazing joint.