摘要
研究了γ′-Co3(Al,W)相沉淀强化的新型钴基高温合金,Co-Al-W抗高温氧化性能。利用SEM、EPMA、XRD等方法研究了新型Co-Al-W合金在800℃和900℃空气中静态氧化增重动力学和抗高温氧化机理,并与镍基高温合金Manaurite900相比较。研究发现,在800℃氧化时,9.8W合金抗氧化能力最强,但在900℃时,9.8W和7.5W合金的增重最大,Manaurite900和10.7W的抗氧化能力最好。合金在2种温度下氧化后,表面氧化膜主要由三层构成,即Co氧化物Co3O4组成的氧化膜最外层,Co、Al、W复杂氧化物组成的中间过渡层及Al和Co氧化物组成的氧化膜最内层。
The high-temperature oxidation resistance of Co-Al-W alloy,strengthened by a ternary compound γ＇-Co3（Al,W） phase,was investigated.The kinetic data of mass gain and the cyclic oxidation behavior of the Co-Al-W alloys,including Co-9Al-7.5W（7.5W）,Co-9Al-9.8W（9.8W） and Co-9.2Al-10.7W（10.7W）,were studied at 800 and 900 ℃ by XRD,SEM and EPMA technologies,and they were compared with a nickel-base Manaurite900（MAN900） alloy.The results show that the anti-oxidative ability of 9.8W alloy is the best at 800 ℃ among these alloys.But at 900 oC the square of mass gain of 7.5W and 9.8W alloys are much greater,while the anti-oxidant property of MAN900 and 10.7W alloys are superior to other alloys.The oxide scales at 800 and 900 ℃ exhibit a multi-layered structure,including an outer layer of Co3O4,an intermediate layer composed of complex oxides of Co,Al and W elements layer,and an internal attacked layer with oxides of Co and Al.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第10期1742-1747,共6页
Rare Metal Materials and Engineering
基金
2009年中国科学院"西部之光"和"甘肃省中青年科技基金计划"(099RJYA018)项目资助
关键词
CO-AL-W合金
高温氧化
氧化机理
Co-Al-W superalloys
high-temperature oxidation
oxidation mechanism
