激光近形制造钛合金试件力学性能的初步研究  

Mechanical Properties of Titanium Alloy Specimens Fabricated by Laser Engineered Net Shaping:a Preliminary Study

作　　者：郑韵哲[1] 吴琳[2] 商宁波[3] 

机构地区：[1]解放军201医院口腔科,辽阳市111000 [2]中国医科大学口腔医学院修复科 [3]中科院沈阳金属研究所

出　　处：《中国激光医学杂志》2009年第5期273-278,共6页Chinese Journal of Laser Medicine & Surgery

基　　金：863计划资助项目(2006AA03Z446);辽宁省科学计划资助项目(2005225013-5)

摘　　要：目的比较激光近形制造技术和铸造技术制作的钛合金试件的材料性能,探索激光快速成形此新工艺在口腔修复领域中的应用。方法以-200～325目气雾化法制备的球形钛合金粉末为原料,应用激光近形制造技术制作钛合金试件,测试其在拉伸试验中的抗拉强度、屈服强度,三点弯曲试验中的弯曲弹性模量、抗弯强度,以及维氏显微硬度,并与铸造技术制作的钛合金试件进行对比;观察两种不同加工方法制作的钛合金试件的组织结构,以及拉伸断口的微观形貌特征。结果激光近形制造技术制作钛合金试件,成形速度快,成形件无缺陷,其抗拉强度、屈服强度、弯曲弹性模量、抗弯强度、维氏显微硬度分别为(1056.92±61.69)N/mm2、(62.65±61.91)N/mm2、(133722.62±3618.18)MPa、(2313.42±129.16)MPa、376.24±14.88。激光近形制造试件的抗拉强度、屈服强度显著高于铸造钛合金试件。金相显微镜显示激光近形制造钛合金试件的组织为针状细枝晶的微晶结构,拉伸断口呈现均匀细致的韧窝形貌,发生韧性断裂。结论激光近形制造技术可以满足口腔修复的加工要求,但需要进一步研究其成形性能及提高精度。Objective To compare the properties of titanium alloy specimens fabricated by laser engineered net shaping （LENS） and casting, and to probe the new method of laser rapid forming in prosthodontics field. Methods The titanium alloy specimens were fabricated from gas-atomised spherical titanium alloy powder sized from 200 to 325 mesh by LENS technology. The tensile strength and yield strength in tensile testing,the flexibal module and anti-bend strength in three point bending testing, and the micro-vickers hardness of the titanium alloy specimens were measured and compared with those of other specimens made by wax-lost casting. The microstructures and natural fracture surface of the titanium alloy specimens made by two different process were observed. Results The titanium alloy specimens could be obtained by the method of LENS technology,which had a rapid shaping speed, and had no defect. The tensile strength, yield strength, flexibal module, anti-bend strength and the micro-vickers hardness of the titanium alloy specimens were about （ 1 056. 92 ± 61.69） N/mm^2, （62. 65 ± 61.91 ） N/mm^2, （ 133 722. 62 ± 3 618.18 ） MPA, （2 313.42 ± 129. 16） MPA, and 376. 24 ± 14. 88. The tensile strength and yield strength of the titanium alloy made by laser engineered net shaping were much better than those made by casting. The optical microscopy showed that the microstructure of the titanium alloy specimens fabricated by LENS was a dense and acircular structure distributed uniform at all field. The tensile fractured surface of the titanium alloy specimens fabricated by LENS appeared to be a mass of even dimple, and the fracture mechanism belonged to ductile fracture. Conclusions The LENS technology is satisfied for the prosthodontics completely,yet the further study on the forming properties and on the better forming precision will carry ont.

关 键 词：钛合金 电脑辅助设计/电脑辅助制造(CAD/CAM) 激光近形制造 力学性能 

分 类 号：R783.6[医药卫生—口腔医学]