摘要
目的观测几种加工参数设置对选择性激光熔积（SLM）钴铬合金的表面形貌和表面维氏硬度的影响。方法使用正交实验设计9组不同的加工参数,即激光功率为2500W、2750W、3000W,扫描速度为5mm/s、10mm/s、15mm/s,送粉速率为3r/min、4.5r/min、6r/min,制备9组选择性激光熔积钴铬合金试件,每组5个（直径10mm,厚度3mm）,经抛光处理后分别进行扫描电镜观察和表面维氏硬度测试,采用SPSS16.0软件包进行数据处理。结果 9组不同加工参数制备下SLM钴铬合金试件的扫描电镜图像均呈现均匀而规则的细胞样结构;其平均表面维氏硬度均在345HV以上。结论当加工参数设置在激光功率2500~3000W,扫描速度5~15mm/s,送粉速率3~6r/min范围内时,SLM钴铬合金具有较为理想的表面形貌和表面硬度,能适合临床应用需求。
Objective To investigate the effects of several processing parameters on surface morphology and surface hardness of cobalt-chromium（Co-Cr） alloy fabricated by selective laser melting（SLM）. MethodsNine groups of selective laser melting Co-Cr alloy were fabricated by different processing parameters（laser power： 2500 W, 2750 W, 3000W; scanning speed： 5mm/s, 10mm/s, 15mm/s; power feeding rate： 3r/min, 4.5r/min, 6r/min） by orthogonal experiment design, each group has five specimens（10mm diameter and 3mm thickness）. The specimens＇ surface morphology was observed by a scanning electron microscope and their Vickers hardness was measured by micro-hardness tester. The data was analyzed with SPSS16.0 software package. Results The SEM images showed all selective laser melting Co-Cr alloy had a homogeneous and regular cellular structure and the mean surface Vickers hardness were all above 345 HV. Conclusion When laser power is set at 2500-3000 W, scanning speed is set by 5-15mm/s and power feeding rate is set by 3-6r/min, SLM Co-Cr alloy has both ideal surface property and surface hardness, which can meet the clinical demands.
出处
《口腔材料器械杂志》
2015年第4期173-176,共4页
Chinese Journal of Dental Materials and Devices
基金
上海市科学技术委员会资助(12441903001)
国家重点基础研究发展计划项目(973项目
2012 CB910401)
关键词
加工参数
选择性激光熔积
钴铬合金
表面硬度
Processing parameter Selective laser melting Co-Cr alloy Surface hardness
