Patent ID: 7223067
Filing Date: 2007-05-29
Classification: C04B,C09K,C23C,Y02T,Y10T

Abstract:
1. A flow machine with an abradable of a particle composite material which contains granular core particles of ceramic material whose surfaces carry functional layers, wherein these layers form an intermediate phase of the composite which is stable at a high operating temperature, the intermediate phase being produced in situ on the particle surfaces at least in part by a chemical reaction of a precursor material and material of the granular core particles, wherein bonds are formed between the granular core particles arranged in a porous composite by the intermediate phase and these bonds have a breaking characteristic of abradables, and wherein the granular core particles are coated with a mixture of the precursor material and ceramic material prior to a formation of the composite, with the precursor material and the ceramic material consisting of fine-grain particles whose diameters are smaller than 1 μm.