真空感应熔炼CuCr25合金氧含量的影响因素

Studies of Oxygen Content in CuCr25 Alloys Prepared by Vacuum Induction Melting

研究了坩埚材料、真空度和合金元素Al对真空感应熔炼CuCr2 5合金氧含量的影响。结果表明 :使用碱性氧化物MgO坩埚制得的CuCr2 5合金的氧含量非常高 ,达到千分之几 ,同时可以引起Cr的偏析。而使用中性氧化物Al2 O3 坩埚后可以完全避免这些问题 ,合金的组织和性能大大改善 ,氧含量降低到 70 0× 10 -6左右 ,如果在此基础上添加适量的脱氧剂Al,则可以制备出性能优异的CuCr2 5触头材料 ,其性能完全达到常规CuCr5 0触头材料的水平。

Influence of crucible materials and base pressure of the vacuum system on oxygen content of CuCr25 alloy,prepared by vacuum induction melting (VIM) was studied.The results show that the crucible materials strongly affect the oxygen content of the CuCr25 alloy.For example,with an alkaline MgO crucible,the O content can be as high as 3500×10 -6 and Cr segregation also occurs,whereas an alumna (Al 2O 3) crucible reduces the O contents to 700×10 -6 or lower.We found that addition of reduction agent,such as Al,may further reduce oxygen content considerably.