华西口腔医学杂志

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激光表面强化技术对牙用铸造合金耐腐蚀性能影响的研究

WU Junling1, ZHANG Qiang2, WANG Xin-hong3   

  1. 1.山东大学口腔医院山东省口腔生物医学重点实验室, 山东济南250012;2.济南市口腔医院口腔修复科, 山东济南250001;3.山东大学材料科学与工程学院连接技术研究所, 山东济南250061
  • 收稿日期:2010-10-25 修回日期:2010-10-25 出版日期:2010-10-20 发布日期:2010-10-20
  • 通讯作者: 吴峻岭,Tel:0531-88382853
  • 作者简介:吴峻岭(1977—),男,山东人,主治医师,博士

Effect of laser surface hardening technology on the corrosion resistance of dental casting alloy

WU Junling1, ZHANG Qiang2, WANG Xin-hong3   

  1. 1. College of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan 250012, China; 2. Dept. of Prosthodontics, Jinan Dental Hospital, Jinan 250001, China; 3. Institute of Joining Technology, College of Materials Science and Engineering, Shandong University, Jinan 250061, China
  • Received:2010-10-25 Revised:2010-10-25 Online:2010-10-20 Published:2010-10-20
  • Contact: WU Junling,Tel:0531-88382853

摘要:

目的研究激光表面强化技术对牙用铸造合金耐腐蚀性能的影响。方法制备23个钴铬合金金属片试件,将其中22个试件随机分成实验组(试件进行激光表面强化处理)和对照组(试件不进行激光处理),每组11个,其中10个用电化学方法检测耐腐蚀性能,1个用扫描电镜观察表面金相结构及形貌。另取1个试件,其表面只进行部分区域激光表面强化处理,用于表面金相结构及形貌的对比观察。结果实验组试件金属晶粒分布均匀,而且晶粒细化,尺寸基本一致;部分区域激光表面强化处理试件的激光强化处理区有明显细化晶粒的现象。实验组和对照组自腐蚀电位、自腐蚀电流对数间的差异有统计学意义(P<0.01)。结论激光表面强化处理可以明显提高钴铬合金在人工唾液中的耐腐蚀性能。

关键词: 激光, 耐腐蚀性, 牙用铸造合金, 钴铬合金

Abstract:

Objective To investigate the effect of the laser surface hardening technology on the corrosion resistance of dental casting alloy. Methods Twenty -three cobalt -chromium alloy specimens were made in this study. Twenty-two specimens were equally divided into two groups randomly. One was experimental group for laser surface hardening processing and the other was control group without any treatment. In each group, ten specimens were used for corrosion analysis by electrochemical method, and one for surface metallographical structure and morphology observation by scanning electron microscope. Remaining one specimen was partially processed on limited area for surface metallographical structure and morphology comparison. Results Metal grains distributed uniformly and achieved a good refinement with mainly the same size in experimental group. Metal grains in specimen which processed in its partial surface area also achieved a good refinement in the laser processing area. There was statistical difference in electric potential of corrosion and logarithmic value of current of corrosion between experimental group and control group(P<0.01). Conclusion Laser surface hardening technology has a positive effect in improving the corrosion resistance of dental casting alloy in artificial saliva.

Key words: laser, corrosion resistance, dental casting alloy, cobalt-chromium alloy