DZ445镍基高温合金高温长时间氧化形成的多层膜结构

刘来娣, 丁彪, 任维丽, 钟云波, 王晖, 王秋良

Multilayer Structure of DZ445 Ni-Based Superalloy Formed by Long Time Oxidation at High Temperature

LIU Laidi, DING Biao, REN Weili, ZHONG Yunbo, WANG Hui, WANG Qiuliang

表4 900℃下不同时段的氧化动力学方程指数(n)、恒温氧化速率常数(K)和氧化激活能(E)

Table 4 Oxidation kenetics equation exponent (n), oxidation rate constant (K), and activation energy (E) before and after the formation of continuous CrTaO4 layer and subinner layer at 900oC

Time n K E / (kJ·mol-1) Before the formation of CrTaO4 layer 2.17 1.0 × 10-2 mg2·cm-4·h-1 325 Between the formation of subouter and subinner layer 4.17 1.93 × 10-3 mg3·cm-6·h-1 424 After the formation of subinner layer 25.00 3.5 × 10-5 mg25·cm-50·h-1 485