热处理对牙用Ti-12Zr合金组织与性能的影响
Effect of Heat Treatment on Microstructure and Properties of Ti-12Zr Alloy for Clinical Tooth
姚生莲1,2, 徐国富1,2, 李 旭1,2, 陈 蕾3
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作者单位：1. 中南大学 材料科学与工程学院, 湖南 长沙 410083; 2.中南大学 有色金属材料科学与工程教育部重点实验室, 湖南 长沙 410083; 3. 中南大学 湘雅口腔医学院, 湖南 长沙 410008
中文关键字：热处理； Ti-12Zr合金； 组织； 性能
英文关键字：heat treat; Ti-12Zr alloy; microstructure; properties
中文摘要：为了对Ti-12Zr合金在牙科的临床使用提供实验及理论依据，借助维氏硬度测量、电化学性能测试和扫描电子显微镜镜(SEM)的观察及X-射线衍射(XRD)的分析，研究了牙用Ti-12Zr合金经200、400、500、600和800 ℃加热(氧化)处理后合金的表面维氏硬度、形貌、结构及电化学性能。结果表明：经不同热氧化温度处理的Ti-12Zr合金表面能够生成不同厚度的ZrO2 和(Ti，Zr)O2陶瓷层，其硬度比Ti-12Zr合金基材高；在人工唾液环境中， 在500 ℃以下， 随热氧化温度的升高，Ti-12Zr合金表面生成的陶瓷层耐腐蚀性能随着温度的升高而增加，500 ℃时，腐蚀电位Ecorr达到最大值(-18 mV)，抗腐蚀性能最好，超过500 ℃时， Ecorr又降低，抗腐蚀性能变差。
英文摘要：The aim is to provide basis of experiment and theory for Ti-12Zr alloy clincal application. After different temperature (200, 400, 500, 600 and 800 ℃) thermal oxidation, the surface hardness were measured by digital micro-hardness tester, the electrochemical corrosion behavior was investigated in artificial saliva by the analysis of polarization curves and the surface morphologies and microstructure of Ti-12Zr alloy for clinical tooth were investigated by SEM and XRD. The results show that: ZrO2 and (Ti, Zr)O2 ceramic oxide coating produce after different temperature thermal oxidation accordingly. The micro-hardness is higher than Ti-12Zr alloy matrix. In artificial saliva, the electrochemical corrosion behavior of the ZrO2 and (Ti, Zr)O2 ceramic oxide coating improves with the increase of thermal oxidation temperature, below 500 ℃. The electrochemical corrosion behavior is best at 500 ℃, then Ecorr is -18 mV. The electrochemical corrosion behavior reduces and Ecorr reduced over 500 ℃.