摘要
目的探讨牙科低金含量银钯合金在不同温度处理后的时效强化机制。方法采用标准牙科失蜡铸造程序制备21个10 mm×10 mm×1 mm的试样备用。首先将全部试样固溶处理后冰水淬火冷却。之后3组试样分别在400、459、600℃温度下等温强化处理1、2、5、10、20、50、100 min。然后观察试件金相结构,行显微镜硬度测试与X射线衍射仪(XRD)检测。结果时效温度越高合金硬度值增加速度越快。金相显微镜观察发现,随着时效时间增加,晶界和亚晶界处有沉积相出现并逐渐增多。XRD结果显示,400℃时效处理组从50min起有富铜(Cu)相出现,459℃时效处理从10 min起有富Cu相和Cu3Pd出现,600℃时效处理组从5 min出现Cu3Pd。结论不同时效处理后低金含量银钯合金硬度升高与相变所致的内应变高度相关。
Objective To explore the age-hardening mechanism of dental low-gold content Ag-Pd alloy after different heat-treatment techniques.Methods A total of 21 samples with 10 mm×10 mm×1 mm shaped were cast by standard lost-wax casting craft.Then the samples were divided into 3 groups,7 samples in each group.After solution-treated,3 groups were heat-treated at 400,459,600℃,respectively,for 1,2,5,10,20,50 and 100 min.Then,the metallographic structure of the test piece in all 3 groups were observed,and performed the micro-Vicker’s hardness test and X-ray diffraction(XRD)test.Results Higher treatment temperature led to quicker increasing of hardness.The results of Micro-Vicker’s test showed that,with more treatment time,deposition was observed in grain boundary and sun-grain boundary.The results of XRD showed that Cu-rich phase was found in 400℃group when treated for 50 min;Cu-rich phase and Cu3 Pd phase were found in 459℃group when treated for 10 min;and Cu3 Pd phase were found in 600℃group when treated for 5 min.Conclusion The increasing of hardness of low-gold content Ag-Pd alloy was closely related to inner strain caused by phase transition.
作者
潘小波
杨征
田保
孟玉昆
PAN Xiaobo;YANG Zheng;TIAN Bao;MENG Yukun(Department of Stomatology,the People's Hospital of Guangxi Zhuang Autonomous Region,Nanning,Guangxi Zhuang Autonomous Region 530021,China;Department of Rehabilitation,Hospital of Stomatology West China College,Sichuan University,Chengdu,Sichuan 610044,China;Department of Stomatology,Sichuan Provincial People's Hospital,Chengdu,Sichuan 610072,China)
出处
《重庆医学》
CAS
2019年第24期4235-4237,4241,共4页
Chongqing medicine
基金
桂科技攻关项目(0993003B-31)
关键词
热处理
低金含量银钯合金
时效强化机制
显微硬度
金相结构
heat treatment
low-gold content Ag-Pd alloy
age-hardening mechanism
micro-hardness
metallurgical structure
