摘要
采用包埋渗法在TZM钼基高温合金表面制备抗氧化的渗铝层,渗铝温度为1 050℃,渗铝时间为12 h;采用SEM、EDS和XRD等分析了渗层的显微组织、物相组成和元素分布等,并对渗层的硬度和抗高温氧化性能进行了研究。结果表明:渗层的相组成为Al_5Mo、Al_3Mo和Al_4Mo;渗层均匀致密,厚度达到130μm,具有双层结构,与基体形成了冶金结合;渗层表面呈颗粒状,其显微硬度达到了8 000 MPa;在800℃×80 h高温氧化下包埋渗铝层具有较好的抗氧化性能。
Oxidation resistant aluminized layers on the TZM Mo-based superalloy surface were prepared by pack cementation technique at 1 050℃for 12 h.The microstructure,phase composition and element distribution of the layers were analyzed by means of SEM,EDS and XRD.The hardness and high temperuture oxidation resistance of the layer were discussed.The results show that the phase composition of the layers were Al_5Mo,Al_3Mo and Al_4Mo.The layer with double layer structure was uniform and compact,whose thichness was 130μm and had a good metallurgical bonding with the substrate.The hardness of the aluminized layer with granular surface was 8 000 MPa. The pack cementation aluminized layer had good oxidation resistance after oxidizing at 800℃for 80 h.
出处
《机械工程材料》
CAS
CSCD
北大核心
2010年第9期64-66,93,共4页
Materials For Mechanical Engineering
基金
江苏省科技成果转化专项资金资助项目(BA2007036)
关键词
钼基高温合金
包埋渗
铝化物
高温氧化
Mo-based superalloy
pack cementation
aluminide
high temperature oxidation
