摘要
以Al粉为主料,Sn粉、SiO_2粉、苯丙乳液、聚乙烯醇、羧甲基纤维素等为配料制备高温防氧化涂料。将涂料喷涂到钛基体表面,然后置于1050℃恒温8 h,对比喷涂与热处理前后表面形貌。利用金相显微镜观察裸露面和喷涂面经热处理后的氧化层组织,使用场发射扫描电镜、能谱分析仪研究涂层界面处的微观形貌和元素扩散,采用X射线衍射仪探讨涂层界面处的相结构。结果表明,喷涂铝基高温防氧化涂层后,表面没有裂纹也没有出现脱落,表面仍保持原金属光泽,能够有效地减缓钛基体热加工过程中的高温氧化。涂层厚度对Ti-Al扩散层的厚薄无明显影响,扩散层形成了Al_2O_3-TiAl和TiAl_3-Ti多层结构,且涂层厚度为50μm左右时已经具有较好效果。
High temperature oxidation resistant coatings were prepared using Al powder as main raw material and Sn powder, SiO2 powder,styrene acrylic emulsion, polyvinyl alcohol, sodium carboxymethyl cellulose as burdening. Subsequently, the coatings were sprayed onto the surface of titanium substrate, and then the sample was placed at constant temperature of 1050 ℃ for 8 h; the surface topography was also compared for the flakes with coating or not. The microstructures of the exposed surface and sprayed surface were analyzed by optical microscope, the interface of coating microstructure and elements diffusion were analyzed by field emission scanning electron microscopy and energy spectrum analysis instrument, and the interface phase structure was analyzed by X-ray diffraction. The results show that high temperature oxidation resistant coatings at titanium billet surface have no cracks, without dropping from the surface and remaining metallic luster. It can effectively slow down the high temperature oxidation process of titanium billet during the thermal procedure. The effect of the coating thickness on the thickness of Ti-Al diffusion layer is not significant; the Al2O3-TiAl and TiAl3-Ti-Ti multilayers co-form the diffusion layer; moreover, the excellent coating thickness is about 50 μm.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第2期682-686,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51264016
513011446)
关键词
高温抗氧化涂层
钛基体
热加工过程
界面微观结构
high temperature oxidation resistant coating
titanium substrate
thermal processing
interracial microstructure
