摘要
测定了铸造镍基高温合金K35在850—1000℃温度范围内的氧化动力学曲线;并计算出其氧化激活能Q_(p1)=274 kJ/mol,Q_(p2)=315 kJ/mol,其氧化动力学曲线都符合抛物线规律,900℃以下,K35合金属于完全抗氧化级;900—1000℃为抗氧化级,X射线衍射、扫描电镜和能谱分析表明,K35合金的氧化膜分为3个区域:外层是性质疏松的Ti及Cr氧化物混合层,并含有少量尖晶石NiCr_2O_4与NiAl_2O_4;中间层是性质致密的Cr_2O_3氧化层;内层(过渡层)是Al_2O_3。
The oxidation behavior of a cast Ni-base superalloy K35 in air over the temperature range of 850 to 1000 degreesC for period up to 100 h has been studied. The results indicate that oxidation kinetics obey parabolic law from which the values of activation energy Qp(1) = 274 kJ/mol and Q(p2) = 315 kJ/mol were estimated. The scales on the surface were determined by SEM, and EPMA equipped with an EDXS unit. The results show that oxidation scales are composed of loose upper layer consisted of TiO2/TiO-Cr2O3 and a small amount of NiCr2O4 and NiAl2O4, compact intermediate layer Cr2O3, as well as discrete internal oxides Al2O3.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第7期749-754,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金59895152
关键词
铸造镍基高温合金
高温氧化
氧化动力学
cast Ni-base superalloy
high temperature oxidation
oxidation kinetics
