Patent ID: 8647520
Filing Date: 2014-02-11
Classification: C23C,F05B,F05C

Abstract:
1. A method for restoring strength and wear resistant of a metallic matrix ceramic comprising a metallic binder and ceramic filler particles, which metallic matrix ceramic has been exposed to temperature and pressure cycling in a gas exhaust nozzle, whereby micro cracks are developed in the outer layer of the metallic binder wherein the metallic binder containing micro cracks, partly or fully, is removed from the metallic matrix ceramic by chemical etching operation, wherein the chemical etching operation comprises adding a chemical solvent comprising an iron chloride acid solution, wherein the chemical solvent is added by a movable multi-hole spray nozzle device to the outer layer for dissolving binder containing micro cracks, washing the outer layer for neutralization and cleaning the outer layer from dissolved binder and solvent residues and then drying the outer layer, where after the chemical etching operation a new binder material is added by sputtering to the outer layer for replacing lost binder material in the metallic matrix ceramic, and where after the new binder is added, the metallic matrix ceramic is compressed by a shot peening operation for achieving a dense outer layer, wherein the ceramic filler particles are close to each other, and wherein the chemical etching operations and the shot peening operation alternate and are repeated for a plurality of cycles, which depends on the frequency and the depth of the micro cracks.