Development of cavitation resistant alloy as a replacement material

钨铬钴合金是一种高耐腐蚀材料，广泛用于阀门。然而，这种合金制造困难，并且在无线电激活环境中具有较长的半衰期。因此，需要开发替代材料。在本研究中，采用纯钛和镍粉的混合物制备了PTA（等离子转移电弧）焊缝覆盖层。焊缝覆盖层的镍含量在40 ~ 80 %之间。结果表明，Ti40at%-Ni60at%的焊缝覆盖层具有最高的抗腐蚀性能。在950℃下热处理1h后，焊缝覆盖层的抗冲蚀性能得到提高，其抗冲蚀性能与钨铬钴合金相近。结果表明，钛镍焊层是钨铬钴合金的替代材料。

Stellite alloy is a high erosion resistant material and is widely used for valves. However, this alloy is difficult to fabricate and has a long half period for radio activated environment. Therefore, it was required that the replacement material should be developed. In this study, a PTA (plasma transferred arc) weld overlay was fabricated using the mixtures of pure titanium and nickel powders. The nickel content of weld overlay ranged from 40 at% to 80at%. It was found that the weld overlay of Ti40at%-Ni60at% show the highest erosion resistance. The erosion resistance of this weld overlay was improved with the 1hour heat treatment at 950 degree C. The erosion resistance of these Ti-Ni weld overlays was similar to that of the stellite alloy. It was concluded that the Ti-Ni weld overlay is the replacement material by the stellite alloy.