P添加对一种新型镍基铸造合金高温氧化性能的影响

Influnence of P Addition on High Temperature Oxidation Behavior of a New Type Ni-Based Superalloy

用热重法研究了微量元素P对一种新型镍基高温合金K984G高温氧化行为的影响。结果表明:合金在800℃、850℃和900℃恒温氧化动力学较抛物线规律有所偏离,氧化后期比较符合立方规律,微量元素P添加对其无影响。然而,添加微量元素使其氧化激活能由154.1k J/mol和295.7k J/mol增加至169.1k J/mol和318.4k J/mol。此外,添加P后,合金氧化激活能增加,抗氧化性能降低。

The influnence of trace element P on oxidation behabvior of a new type Ni-based superalloy K984 G at elevated temperature was studied by TGA method. The results indicate that there exists no effect of trace element on oxidation kinetics. The initial oxidation stage of the oxidation kinetic law deviates from the parabolic law and the latter stage is more in line with the cube law at 800℃,850℃ and 900℃. How ever,the values of activation energy increase from 154. 1k J / mol and 295. 7k J / mol to 169. 1k J / mol and 318. 4k J /mol,which reduces oxidation resistance,when P element is added to the alloy.