A kind of method for preparing cocralysi alloy target material

Abstract

The invention discloses a preparation method of CoCrAlYSi alloy target and relates to a CoCrAlYSi alloy target which is prepared from multiple intermediate alloys by using an appropriate smelting process and is stable in element content, segregation-free and good in quality performance. The preparation method of the CoCrAlYSi alloy target is characterized in that a Co-Al alloy is used for ensuring that the melting temperatures of all materials tend to be close, and the volatilization of a low-melting-point element Al is avoided; a Cr-Si alloy is used for avoiding complex reaction between an Si element and other elements; and a Cr-Y alloy is added before casting so as to avoid oxidation slagging of Y and instability of the content of the Y in the finished product, and the segregation-free alloy target product in which the contents and proportions of elements are identical is successfully prepared finally.

Description

technical field [0001] The present invention is aimed at a special melting method proposed for a CoCrAlYSi alloy target used to prepare a thermal barrier coating, in order to stabilize the content of low melting point and easily oxidizable elements in the alloy, eliminate segregation, and improve the quality and yield of the target . Background technique [0002] The development history of thermal barrier coating (TBC) technology has been more than 40 years. It deposits the coating on the surface of the hot end parts through the coating process, thereby improving the high temperature corrosion resistance of the metal hot end parts and prolonging the service life of the workpiece. the goal of. Thermal barrier coating technology is applied to gas turbine turbine blades, guide vanes, airfoils, and turbine propellers to reduce fuel consumption of the engine, enhance long-lasting performance, and greatly increase service life [[EvansAG, MummDR, HutchinsonJW, et al.Mechanismscont...

AI Technical Summary

Problems solved by technology

Domestic workers have prepared the alloy target of this system, but the CoCrAlY alloy target has its own characteristics: the melting point of the Al element is low, and it will volatilize violently during smelting, and Al will have a variety of complex interactions with other elements. reaction, and the reaction products are mostly brittle, the compatibility between the products is unknown, and the slagging is serious, which causes great difficulties to the alloy melting and even makes it impossible to cast; the Y element is very easy to oxidize, once the oxide film is formed around it, it will It will block its contact with the surrounding liquid alloy and cannot be dissolved in, and because the rare earth Y is extremely active, it will also generate a large amount of slag during smelting, making it difficult to control the content in the alloy; the matrix element Co itself is brittle and hard, and the alloy is difficult to processing, therefore, there are no reports of successful preparation in China

Most of the currently used CoCrAlY alloy targets are imported from abroad, and the uneven content of elements in them causes splashing during the sputtering process, which affects the control of coating quality, and the content of rare earth elements in the alloy still cannot reach a stable level. level, so that the traceability is low, which hinders the systematic research on coating performance and restricts the application of thermal barrier coatings