氩气雾化镍基高温合金粉末的氧化特性研究  

Oxidation Characteristics of Nickel-Based Superalloy Powders Prepared by Argon Gas Atomization

作　　者：刘娜[1] 李周[1] 张国庆[1] 袁华[1] 许文勇[1] 张勇[1] 

机构地区：[1]北京航空材料研究院先进高温结构材料国防科技重点实验室,北京100095

出　　处：《稀有金属》2011年第4期481-485,共5页Chinese Journal of Rare Metals

基　　金：北京市科技计划项目(D09080300510901);国家973项目(2010CB631205)资助

摘　　要：采用氩气雾化法(AA法)制备出FGH96高温合金粉末,将筛分后的粉末在真空和氩气保护下存储,对储存条件、储存时间以及粉末特性对粉末中氧含量的影响进行研究,分析气雾化高温合金粉末的氧化特性。结果表明,随着储存时间的延长,粉末中的氧含量均呈现增长趋势,真空下粉末的氧含量变化曲线最趋平缓,储存一个月,氧含量由88.3×10-6增加至110×10-6,适合做较长时间的储存;氩气气氛下,短时间内粉末的储存效果较好,随着时间延长储存效果下降,氧含量增长较快,储存一个月达到137×10-6。AES分析结果表明粉末表面存在氧化造成的成分偏析以及碳、氧元素污染,氧元素主要与富集表面的Ti,Cr等元素生成氧化物,粉末表面状态对单个粉末的氧化特性有较大的影响,粉末表面越粗糙,粘附的卫星颗粒越多,粉末的氧含量越大,粉末的氧含量呈现先增加后减小的趋势,表现为高斯分布,其中氧的富集层厚度最大约为38 nm,粉末表面越光滑则氧含量越少,氧含量沿深度分布曲线表现为单调减小,氧元素以物理吸附为主。Nickel-based superalloy powders were fabricated by argon gas atomization,after screening,the powders of particle size less than 63 μm were kept in vacuum as well as argon protection,the effect of storage conditions and storage time on the oxygen content of the powders was analyzed.By means of AES,the oxidation characteristics of powders with different surface state were also discussed.The results showed that,oxygen content of the powders increased as the extension of storage term,the oxygen content curve of powders storage under vacuum was more flat,the oxygen content increased from 88.3×10-6 to 110×10-6,which indicated that vacuum condition was suitable to be used for long term storage;under argon gas atmosphere,the result of short term storage was better,but with time extending,the oxygen contend quickly increased.The AES analysis indicated that there were composition segregation and enrichment of carbon and oxygen elements,the condition of powder surface had great effect on oxidation characteristic,the powders with more satellite particles on coarse surface resulted in high oxygen content,the largest thickness of oxygen enrichment film was approximately 38 nm,the oxygen absorption was lower as powder surface was smoother,the depth distribution of oxygen element represented monotone decreasing.

关 键 词：气雾化 镍基高温合金 储存条件 氧化 

分 类 号：TF123[冶金工程—粉末冶金]