将双层辉光离子渗铌技术应用于TiAl合金从而改善其耐磨性能.对TiAl渗铌合金层组织,室温和600℃高温摩擦学性能进行了研究.结果表明,TiAl经离子渗铌后表面形成厚度约12 μm的铌合金层,渗层组织致密均匀,其组成物主要包括AlNb2、AlNb3、Ti2AlNb 和Nb.铌合金层在600℃的耐磨性明显提高,并且室温耐磨和减摩性能均优于TiAl基材.
Double glow plasma alloying of niobium was applied on TiAl alloy in order to improve its oxidation and wear resistances.Microstructure as well as tribological properties at ambient temperature and 600 ℃ were studied.The results show that a Nb-alloyed layer,about 12 μm in thickness,is formed on the surface of TiAi alloy after plasma alloying treatment.The alloyed layer consisting ofAlNb2,AlNb3,Ti2AlNb and pure niobium is compact and homogenous.Under dry sliding condition,the wear resistance at 600 ℃ is enhanced greatly for Nb-alloyed TiAl and both anti-friction and wear-resistance at ambient temperature are also better than those of untreated TiAl alloy.
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