牙科钴铬合金表面镀氮化锆层后的耐磨性研究

摘要

ObjectiveTo provide a reference basics for the substrate surface treatment according to oral clinic requirements, the wear resistance of zirconium nitride coating on dental Co-Cr alloy was evaluated in this study.Methods Using the magnetron sputtering deposition technology, under a constant heating temperature (200℃),①constant sputtering power (100 w) with different nitrogen partial pressure (25%, 35%, 45%), and② constant nitrogen partial pressure (35%) with different supttering power (50w, 100w, 200w), the zirconium nitride coat-ing was deposited on the surface of dental Co-Cr ally. The wear resistances of two dental Co-Cr alloys with and without zirconium nitride coating were assessed and compared by wear resistance tests.Results The weight loss of test specimens with zirconium nitride coating was significantly less than the uncoated specimens (P<0.05). Under deposition conditions of constant sputtering power and substrate temperature, the weight loss reached the minimum when the nitrogen partial pressure was 35%. Under deposition conditions of constant nitrogen partial pressure and substrate temperature, the weight loss of dental Co-Cr alloy with coatings reached the lowest value when the power was 50w.Conclusion Under the suitable technological conditions, zirconium nitride coatings with excellent properties can be prepared on dental casting Co-Cr alloy by magnetron sputtering coating technology.%目的：评价钴铬(Co-Cr)合金表面经镀氮化锆膜后的耐磨损性，为口腔临床要求的基底表面处理方式提供参考依据。方法运用磁控溅射镀膜技术，设定基体加热温度200℃恒定，分别在①功率为100w、氮气分压选择为25%、35%、45%以及②氮气分压35%，功率为50w、100w、200w的条件下，在Co-Cr合金表面沉积氮化锆涂层，采用磨损试验机测试并比较氮化锆涂层和未镀膜之间的耐磨性能。结果镀氮化锆试件的失重量显著小于未镀膜试件(P<0.05).其中当镀膜的功率和基体温度恒定条件下，氮气分压在35%时镀膜后磨损的失重量最少．而当镀膜的氮气分压和基体温度恒定时，功率在50W时镀膜后磨损的失重量最少。结论在合适的工艺条件下，用磁控溅射镀膜技术可以在牙科铸造支架Co-Cr合金表面制备耐磨性能更优的氮化锆薄膜。