碳钢坩埚表面渗铝复合涂层

以碳钢板为基板材料, 通过表面渗铝和高温化学反应在其表面形成复合保护涂层。研究了反应层厚度与反应温度、时间之间的关系, 并用光学显微镜、XRD对涂层形貌、相组成进行了表征。实验结果表明: 反应产物层厚度随反应温度、时间的增加而增加; 复合涂层由过渡层和反应产物层组成, 过渡层组成为Fe₃Al及少量Fe₂Al₅、Fe₁₄Al₈₆、Al₂O₃, 反应产物层组成为TiB₂、MgO和少量的Mg₂TiO₄、Mg₂B₂O₅、Fe₃Al、FeAl、Ti₂B₅。 

Composition coatings on the surface of carbon steel crucible by aluminizing

The composition protective coatings on the surface of carbon steel crucible were prepared by aluminizing and high temperature chemical reaction. The relations between the thickness of reaction product layer and reaction temperature and time were investigated. The microstructures and phase composition of the coating layer were investigated by means of optics microscope and XRD. The experimental results show that the thicknesses of reaction product layers increase with the reaction temperature and time increasing. The composition coatings are composed of transition layer and reaction product layer. The constitution of transition layer are Fe₃Al and small amount of Fe₂Al₅, Fe₁₄Al₈₆ and Al₂O₃. The reaction product layer are consisted of TiB₂, MgO and small amount of Mg₂TiO₄, Mg₂B₂O₅, Fe₃Al, FeAl and Ti₂B₅.