不同包埋材料对Ti-6Al-7Nb合金铸件表面反应层影响的实验研究  

The experimental study of the influence of different investment materials on the surface reaction layer of Ti-6Al-7Nb alloy castings

作　　者：邹承蓉[1] 何惠明[1] 温静 

机构地区：[1]第四军医大学口腔医学院,陕西西安710032 [2]甘肃省军区平凉干休所,甘肃平凉743403

出　　处：《牙体牙髓牙周病学杂志》2008年第5期273-276,共4页Chinese Journal of Conservative Dentistry

基　　金：陕西省工业攻关基金资助项目(2006K06-G8)

摘　　要：目的:研究不同包埋材料对Ti-6Al-7Nb合金表面反应层的影响,筛选出适合于临床应用的包埋材料。方法:利用临床现用的氧化镁系、磷酸盐系、氧化锆系包埋材料分组包埋铸造Ti-6Al-7Nb合金试件,肉眼观察其表面光滑度和粘粉情况;扫描电镜和金相显微镜观察反应层形貌及微观结构;能谱分析仪对反应层元素成分进行分析;显微硬度仪测量反应层硬度及厚度。结果:氧化镁系包埋料组试件表面反应最轻微,未见明显反应层,表面O及其它元素含量极少,表面显微硬度值最低。磷酸盐和氧化锆系包埋料组试件表面反应层可见4层结构,为烧结层、氧化层、包埋料浸入层及金属基体层,并且表面烧结层和氧化层内富含O及包埋料中Al、Zr、Si等元素,随深度增加,包埋料浸入层内O元素含量逐渐减少,仍有少量包埋料中元素成分,直至金属基体层内完全消失,其表面显微硬度值较氧化镁系包埋料组试件高。结论:氧化镁系包埋材料比氧化锆系和磷酸盐系包埋材料更适合于Ti-6Al-7Nb合金。AIM： To investigate the influence of different investment materials on the reaction layer of Ti-6Al- 7Nb all oy castings, and screen the suitable investment materials for Ti -6Al-7Nb alloy in clinic. METH- ODS： The castings of Ti-6Al-7Nb alloy were invested with the different investment materials based by ZrO2, MgO and phosphate. The roughness and the status of sticky powder were macroscopically observed. The structure of reaction layer was observed with scanning electron microscopy （SEM） and metallurgical microscope. The element composition was analyzed with energy dispersive spectrum （EDS）. The hardness and thickness of reaction layer were observed with microhardness apparatus. RESULTS： The reaction layer of castings invested with MgO - based investment was the thinnest and had the lowest microhardness. The reaction layer of castings invested with phosphate and ZrO2 - based investment was consisted of sintering, oxide, immersion and alloy layer. The content of O, A1, Zr and Si was high and reduced with the depth. The microhardness of these two groups was higher than that of MgO - based group. CONLUSION： The MgO -based investment material may be the best choice for casting Ti-6Al-7Nb alloy.

关 键 词：Ti-6Al-7Nb合金 表面反应层 铸造 包埋材料 

分 类 号：R780.2[医药卫生—口腔医学]