METHOD FOR FORMING POROUS LAYER ON SURFACE OF COPPER MATERIAL

摘要

PURPOSE:To form a good porous alumina layer by sticking a powder mixture composed of aluminum and a brazing material on the nickel or iron coating layer on the surface of a copper material and heating and brazing the same in an inert atmosphere. CONSTITUTION:Higher alcohol is coated on the surface of a copper material 1 coated thereon with nickel or iron 2 which is hardly diffusible in copper or aluminum by a suitable method. Powder of aluminum of about 20-1,000mum and a brazing material are sprayed on the surface of the material 1. The material is heated in a vacuum or nonoxidative atmosphere to melt the brazing material, thereby forming a porous layer 5 consisting of aluminum powder 4. The layer 5 is securely stuck on the surface of the material 1 by the alloy layer 3 of nickel or iron and aluminum.