激光熔覆沉积快速成形纯钛试件的性能研究  

Microstructure and mechanical properties of laser melted rapidly solidified forming pure titanium specimens

作　　者：刘晶[1] 王勇[1] 吕培军[1] 

机构地区：[1]北京大学口腔医学院·口腔医院卫生部口腔医学计算机应用工程技术研究中心,100081

出　　处：《中华口腔医学杂志》2008年第12期748-751,共4页Chinese Journal of Stomatology

基　　金：国家高技术研究发展计划（863计划,2006AA032446）

摘　　要：目的通过比较激光熔覆沉积快速成形（laser melted rapidly solidified forming，LMRSF）技术和铸造技术制作的纯钛试件的组织结构和力学性能，为LMRSF技术在口腔修复中的应用提供依据。方法以纯钛粉末为原料，应用LMRSF技术制作LMRSF纯钛试件6个。制作铸造纯钛试件6个作为对照。测定试件的抗拉强度和显微硬度，扫描电镜观察试件的组织结构和拉伸断口的形貌特征。结果LMRSF纯钛试件组织均匀细致，呈现针状细小晶粒，抗拉强度和维氏显微硬度分别为（510．0±21．2）MPa和（201．4±14．5）MPa，高于铸造纯钛试件[分别为（425．0±35．1）MPa和（186．5±9．5）MPa]，差异均有统计学意义（P〈0．01）。结论LMRSF纯钛试件的组织结构和力学性能优于铸造纯钛试件，更适合用于制作活动义齿支架。Objective To compare the microstructure and mechanical properties of pure titanium specimens fabricated using laser melted rapidly solidified forming （LMRSF） and casting, and to provide scientific evidence for the new method of laser rapid forming in prosthodontic field. Methods Six pure titanium specimens were fabricated from pure titanium powder using LMRSF technology, and six pure titanium casting specimens were used as the controls. The tensile strength was measured and the microstruetures and natural fracture surface of the pure titanium specimens made in two different ways were observed. Results Compared to that in the casting specimen, the microstrueture of the LMRSF titanium specimens was denser and acicular structure distributed more uniformly. The tensile strength and the microhardness of the pure titanium specimens were （ 510. 0 ± 21.2 ） MPa and （ 201.4 ± 14. 5 ） MPa respectively, which were much higher than those of the dental pure titanium castings [ （425.0 ± 35.1 ） MPa and （186.5±9.5） MPa]（P〈0.01）. Conclusions The microstructure and mechanical properties of the pure titanium specimens fabricated using LMRSF are better than that of the pure titanium castings. Therefore, the LMRSF will provide titanium framework with better quality for removable dental restoration.

关 键 词：钛 计算机辅助设计 激光熔覆沉积快速成形 

分 类 号：R686[医药卫生—骨科学]