Ceramic-metal composites.

摘要

A reinforced composite structure is provided comprising a heat resistant chemically-bonded layer of a ceramic composition mechanically attached to a metallic substrate. The structure includes a metallic anchoring matrix characterized by a plurality of spatially and cooperably arranged reinforcing elements, the matrix being attached to the substrate and projecting from the surface thereof with the spatially arranged reinforcing elements of the matrix collectively defining a ceramic-occupiable zone of finite thickness adjacent to and following the surface configuration of said substrate, the zone having at least confined therein the heat resistant chemically-bonded ceramic in intimate contact with the reinforcing elements.

The chemically-bonded ceramic layer is produced by mixing a low-temperature chemical bonding agent with the ceramic composition which is then heated to a low termpera- ture below the normal sintering temperature of the ceramic composition generally employed when the chemical bonding agent is not present, whereby the layer of reinforced heat resistant ceramic is strongly mechanically bonded to the substrate by virtue of matrix attached to the substrate. The invention is particularly applicable to the production of heat resistant abradable seals for use in aircraft turbine engines.