摘要
目的 :比较激光焊接锻钛和铸钛的机械性能。方法 :采用国产Nd :YAG激光焊接机分别焊接锻钛和铸钛 ,并与未焊接的锻钛和铸钛进行对比。实验分 4组 :激光焊接锻钛组、激光焊接铸钛组、锻钛组、铸钛组。利用万能In stron拉伸实验机测试试件的拉伸负荷、屈服负荷和伸长量 ,并作断口扫描电镜观察和维氏显微硬度测试。结果 :激光焊接锻钛的拉伸负荷与锻钛原材料无明显区别 ,屈服负荷大于原材料 ;铸钛的拉伸负荷及屈服负荷略大于锻钛 ;焊接铸钛的拉伸负荷及屈服负荷与焊接锻钛区别不大。焊接及铸造后钛材的伸长量均下降。断口扫描电镜观察显示铸钛呈树枝样结构 ,焊接后呈蜂窝状结构 ;锻钛的蜂窝结构较深 ,激光焊接后蜂窝变浅。激光焊接铸钛的维氏显微硬度略大于激光焊接锻钛。结论 :激光焊接锻钛和铸钛机械性能差别不大 ,可以应用于临床。
Objective:This study was aimed to compare the mechanical properties of laser welded wrought and cast titanium. Methods: According to relevant reports and clinical demands, the specimens of TA2 were machine milled or cast into certain sizes using LZ centrifuge vaccum pressure titanium casting machine. This experiment involved four groups including the laser welded wrought titanium group, the laser welded cast titanium group, the wrought titanium group and the cast titanium group. There were 6 complete specimens in each group and the specimens were ultrasonically cleaned with ethyl and distilled water before they were welded with home made Nd:YAG apparatus, and comparisons of mechanical properties were made among these groups. All tensile specimens were mounted on the Instron universal testing machine to test tensile loads, yield loads and absolute elongations were measured. The cross section of fractured surface was observed under S 2700 Hitachi SEM and Vickers′ microhardness values in different areas were detected with AKASHI microhardness tester. Results: It was showed that the tensile load of laser welded wrought titanium made no difference from that of the original wrought titanium, but the yield load of laser welded wrought titanium was bigger than that of the original wrought titanium. The tensile load and yield load of cast titanium were slightly bigger than those of wrought titanium. The tensile load and yield load of laser welded wrought titanium made no statistic difference from those of laser welded cast titanium. The absolute elongations of cast or welded titanium were lower than those of wrought or non welded titanium. The fractured surface of cast titanium under SEM appeared lath like structure and that of welded cast titanium honeycomb like structure. The honeycomb like structure of wrought titanium was more obvious than that of laser welded wrought titanium. The microhardness value of laser welded cast titanium was slightly bigger than that of laser welded wrought titanium. Conclusion:\ The mechanical\;property of laser welded wrought titanium might be not apparently different from that of laser welded cast titanium.\;
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2000年第6期374-376,共3页
West China Journal of Stomatology
基金
国家自然科学基金资助项目 (编号 394707)
关键词
激光焊接
铸钛
锻钛
机械性能
牙科材料
laser welding
cast titanium
wrought titanium
mechanical property
