SURFACE ALLOY COATING COMPOSITE MATERIAL USED FOR HIGH TEMPERATURE RESISTANT MATERIAL, COATING AND PREPARATION METHOD THEREOF

摘要

The present invention provides a surface alloy coating composite material used for a high temperature resistant material, a coating and a preparation method thereof, which are characterized in that: the surface alloy coating composite material is made of metal alloy powder with a face-centered cubic structure and enamel powder, and a component percentage thereof is as follows: 10-70wt% is the metal alloy powder, and remaining is the enamel powder; the metal alloy powder is selected from at least one type of NiCrAIX, NiCrX and NiCoCrAIX, wherein X is at least one type of hafnium, zirconium, a rare earth element and mixed rare earth, and the mixed rare earth can be two types or more than two types of rare earth elements that are used together or a rare earth element and one type or multiple types of Na, K, Ca, Sr and Ba that are used in a combined way. The surface alloy coating composite material can improve high temperature oxidation resistance and hot corrosion resistance performance, fracture toughness and thermal shock resistance performance of a high temperature alloy substrate. A thermal protective coating made of the material is dense, continuous and smooth, and can form at least partial metallurgical bonding with the high temperature alloy substrate.