溶胶-凝胶涂钛热处理对镍铬合金涂层的影响

Effect of Heat Treatment with Sol-gel Method on Surface of Ni-Cr Alloy after Coating Ti

目的探讨溶胶-凝胶沉积钛法中热处理过程对烤瓷用镍铬合金表面钛涂层的影响。方法经镍铬合金表面预处理、溶胶制备(氯化钛和乙醇溶液)、涂层、热处理(干燥、缩合、烧结成膜),建立溶胶-凝胶沉积钛方法。依据ISO 10289外观评价,分析10个试件经不同热处理后表面颜色及起皮的情况。结果当缩合温度高、时间长,试件起皮的量少,且颜色较浅;而随着烧结温度的升高和持续时间的延长,试件表面颜色变深。当缩合温度为200℃,时间为2 h,烧结温度为450℃,时间为2 h时,金属钛涂层与镍铬合金表面结合最为紧密。结论不同热处理过程通过影响氧化反应,改变金属钛涂层与镍铬合金表面的结合程度。

Objective To study the effect of heat treatment with sol-gel method on the surface of Ni-Cr alloy for PFM after Ti coating. Methods To establish the sol-gel method of Ti coating on the surface of Ni-Cr dental casting alloy for PFM （pre-treatment for the surface of Ni-Cr alloy, preparation of sol, coating, heat treatment） and to evaluate the color and fragmentation of 10 materials after heat treatment by ISO 10289. Results When kept at a higher condensation temperature and held for a longer time, the materials had less fragmentation. A higher agglutination temperature and a longer time made the materials look deep. When the condensation process was heat treated at 200℃ for 2 h and the agglutination process at 450℃ for 2 h, the thin film of Ti combined firmly with the surface of Ni-Cr alloy. Conclusion The procedure for heat treatment of Ti coating will affect the level of oxidation reaction on the surface of Ni-Cr alloy, and will change the level of combination between Ti and Ni-Cr alloy.