Ti_3Al基体/NiCrAlY涂层体系界面固态反应行为研究

STUDY OF THE INTERFACIAL SOLID REACTION BETWEEN THE Ti3Al SUBSTRATES AND THE NiCrAlY COATINGS

重点研究了温度和时间因素对Ｔｉ３Ａｌ基体／ＮｉＣｒＡｌＹ涂层体系界面反应行为的影响。用阴极电弧离子镀方法在Ｔｉ３Ａｌ基体上涂镀ＮｉＣｒＡｌＹ合金涂层，然后在各种不同温度和时间下对试样进行真空扩散热处理。通过对试样截面的ＳＥＭ观察和ＥＤＳ、ＥＭＰＡ、ＸＲＤ成分分析发现：温度对界面反应的影响存在转折点，在８７０℃以上进行热处理，界面呈现出典型的固态反应行为；在不同的温度区域界面反应的控制因素有差异；考察时间对界面反应的影响发现，反应内外层的控制因素不同。

The effect of heat treatment time and temperature the interfacial reaction between NiCrAlY coatings and Ti3Al substrates have been investigated. The Ti3Al substrates were coated with catholic arc ion plated NiCrAlY and then heat treated in vaccum at different temperature and length of time. SEM observation and EDS、EMPA、XRD analysis results showed that:there were great difference in the interfacial reaction between under and above 870℃.Typical solid reaction occurred after heat treatment at 870℃or above. An investigation of the interfacial reaction suggested that the decisive factors were different at different temperature period and at different part of the interface.