(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. 中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083;
3. 中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長沙 410083)
摘 要: 難熔金屬合金具有熔點(diǎn)高、高溫強(qiáng)度高和加工性能良好等優(yōu)點(diǎn)，被廣泛用于航空航天、核工業(yè)等領(lǐng)域，但其高溫抗氧化性能較差，涂覆高溫抗氧化涂層是解決難熔金屬合金熱/氧防護(hù)問題的有效方式。概述鉬、鈮、鉭、鎢、錸等五種難熔金屬合金國內(nèi)外常用合金牌號及其主要性能，總結(jié)這五種難熔金屬合金的高溫抗氧化涂層常用體系、制備方法及其高溫抗氧化性能，并提出多組元成分設(shè)計(jì)、復(fù)合梯度結(jié)構(gòu)設(shè)計(jì)以及制備方法組合優(yōu)化將是涂層研發(fā)的發(fā)展方向，有望逐步滿足難熔金屬合金各類熱端部件的高溫防護(hù)需求。
關(guān)鍵字: 難熔金屬合金；涂層；氧化；高溫防護(hù)；硅化物
（1. School of Material Science and Engineering, Central South University, Changsha 410083, China;
2. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
3. Key Laboratory of Non-ferrous Metals Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China）
Abstract:Due to high melting point, excellent mechanical properties and workability, refractory metals have been become the attractive materials for modern industry and aerospace applications. However, the refractory metals always exhibit rather poor oxidation resistance at high temperature. It has been proved that the method of coating is an effective route to improve the oxidation/thermal resistance of refractory metals. This work reviews the designations and properties of five kinds refractory metal alloys, including molybdenum (Mo), niobium (Nb), tantalum (Ta), tungsten (W) and rhenium (Re). The common systems, preparation methods and high temperature oxidation resistance of these refractory metal alloy coatings were summarized. It suggests that multiple composition design, gradient structure and advanced preparation methods will be the direction of coating research and development, which is expected to gradually meet the high-temperature protection requirements of all kinds of hot end parts of refractory metal alloy.
Key words: refractory metals; coating; oxidation; high temperature protection; silicide
