A COMPOSITE CERAMIC-METAL MATERIAL

摘要

To date, highly porous ceramic materials have been infiltrated with a metal melt so that the product produced therefrom has a predominantly metallic structure. This ceramic-metal composite (CMC) is substantially metal-like in its properties, so that the requirements with regard to hardness, heat stability and wear are well below the values of the purely ceramic materials. The properties of the ceramic materials with regard to flexural strength, toughness, modulus of elasticity, hardness and resistance to wear are to be improved while retaining or increasing the properties such as hardness, temperature behaviour and resistance to wear, which are superior compared with metallic materials. The metal-ceramic composite is characterised in that the ceramic is composed of several layers, the layer thickness being between 10 and 150 mu m and the mean pore radius between 100 and 1000 nm with a final open porosity of 5-14% and a total porosity of 5-30%, and the metal fills the pore volume except for a residual pore volume of 0.1 to 10%, based on the initial porosity. The ceramic-metal composite is preferably used for binding to metal structures, such as welded or soldered ceramic/metal constructions.