摘要
用无机盐料浆法在镍基高温合金K4104表面制备了Al-Si涂层。通过改变粘结剂中铬酐(CrO3)的加入量得到三种不同成分的Al-Si涂层。用静态氧化增重法对Al-Si涂层进行了1000℃的抗氧化性试验,用SiRion扫描电镜对涂层的表面形貌和截面组织形态进行分析研究。结果表明,三种成分的Al-Si涂层1000℃均具有良好的抗氧化性。Al-Si涂层表面经短时间氧化后生成了连续的亚稳态θ-Al2O3氧化膜,随着氧化时间的延长,亚稳态的θ-Al2O3向稳态的α-Al2O3转变。添加少量CrO3制备的Al-Si涂层θ-Al2O3向α-Al2O3转变所需的时间最短,而且生成的α-Al2O3氧化膜最致密,其涂层的抗氧化性优于添加大量CrO3制备的Al-Si涂层和不添加CrO3制备的Al-Si涂层。
Al-Si coating were prepared on nickel-base superalloy K41044 by slurry process. Three Al-Si coating were formed by change adding amount of agglo menant. The high temperature performance of the three Al-Si coating were studied by static high temperature oxidation test under 1000℃×200h. Morphology and cr oss section of these coating were studied by SEM. The results show that the thre e Al-Si coating have good oxidation resistance. The three Al-Si coating formed θ-Al2O3 in the early stage, which transform to α-Al2O3 with time prolonging. A l-Si coating which add a littlt CrO3 finishing transforming from θ-Al2O3 to α- Al2O3 more quickly and its oxide scales formed is more compact. So the Al-Si coa ting adding a little CrO3 have better oxidation resistance than Al-Si coating ad ding no CrO3 and Al-Si coating adding a lot of CrO3.
出处
《热加工工艺》
CSCD
北大核心
2005年第6期23-25,共3页
Hot Working Technology
