有机胶体黏附力作用下的钎焊工艺

摘要

Adhesion force of organic colloidal can improve the interfacial tension of the material sur-faces to be connected and thus provide favorable conditions for brazing between dissimilar materials. The epoxy resin was chosen as viscous colloid,TiH2 powder as the source of active elements,and AgCu eutectic alloy foil as filler metal.The mixture of TiH2 and epoxy resin in a certain percentage was coated on the surface of SiO2f/SiO2 composites and heated to evaluate the wetting ability.The re-sults of wetting experiment on the coated surface show that colloid adhesion improves the wetting and spreading of brazing filler materials.The application of this novel method in brazing can realize sound joints between Invar alloy and SiO2f/SiO2 composites,Cf/SiC composites or Al2 O3 ceramic.%利用有机胶体的黏附作用力改善待连接表面的界面张力，可为实现异种材料间的钎焊连接提供有利条件。以环氧树脂为黏性胶体，TiH2粉为活性元素源，AgCu 共晶合金箔为钎料，将 TiH2与环氧树脂混合后涂敷在 SiO2f／SiO2复合材料表面，并在此表面进行钎料润湿实验。结果表明：胶体黏附力对钎料的润湿铺展具有促进作用。将此工艺用于钎焊连接，可实现 SiO2f／SiO2复合材料、Cf／SiC 复合材料以及 Al2 O3陶瓷与 Invar 合金的冶金致密连接。