激光熔积钴铬合金的热膨胀系数测定

The measurement of thermal expansion coefficient of Co-Cr alloy fabricated by selective laser melting

目的 :研究不同工艺参数下SLM钴铬合金的热膨胀系数是否符合临床需求,为国产SLM钴铬合金的研制及SLM技术早日国产化提供技术支持。方法 :用DIL402PC型热膨胀仪分别记录9组试件从室温到980℃的升温曲线,升温速度和降温速度均控制在5 K/min,然后分别计算9组试件△T 20~500℃和20~600℃的平均热膨胀系数。结果:9组不同工艺参数SLM钴铬合金在△T 20~500℃的平均热膨胀系数分别为13.9×10^(-6)/K、13.6×10^(-6)/K、13.9×10^(-6)/K、13.7×10^(-6)/K和13.5×10^(-6)/K、13.8×10^(-6)/K、13.7×10^(-6)/K、13.7×10^(-6)/K和13.9×10^(-6)/K;在△T 20~600℃的平均热膨胀系数分别为14.2×10^(-6)/K、13.9×10^(-6)/K、13.8×10^(-6)/K、14.0×10^(-6)/K、14.1×10^(-6)/K、14.1×10^(-6)/K、13.9×10^(-6)/K、14.2×10^(-6)/K、13.7×10^(-6)/K。结论:不同工艺参数下的国产SLM钴铬合金与VITA VMK 95瓷粉的热膨胀系数能达到理想的金瓷匹配,符合临床需求。

PURPOSE： To investigate the thermal expansion coefficient of different processing parameters upon the CoCr alloy prepared by selective laser melting（SLM） technique,in order to provide technical support for clinical application of SLM technology.METHODS： The heating curve of self-made Co-Cr alloy was protracted from room temperature to980℃ with DIL402 PC thermal analysis instrument,keeping temperature rise rate and cooling rate at 5 K/min,and then the thermal expansion coefficient of 9 groups of Co-Cr alloy was measured from 20℃ to 500℃ and 600℃.RESULTS： The9 groups thermal expansion coefficient values of Co-Cr alloy heated from 20℃ to 500℃ were 13.9 ×10^（-6）/K,13.6 ×10^（-6）/K,13.9 ×10^（-6）/K,13.7 ×10^（-6）/K,13.5 ×10^（-6）/K,13.8 ×10^（-6）/K,13.7 ×10^（-6）/K,13.7 ×10^（-6）/K,and 13.9 ×10^（-6）/K,respectively;when heated from 20℃ to 600℃,they were 14.2 ×10^（-6）/K,13.9 ×10^（-6）/K,13.8 ×10^（-6）/K,14.0 ×10^（-6）/K,14.1 ×10^（-6）/K,14.1 ×10^（-6）/K,13.9 ×10^（-6）/K,14.2 ×10^（-6）/K,and 13.7 ×10^（-6）/K,respectively.CONCLUSIONS： The results showed that the Co-Cr alloy has good matching with the VITA VMK 95 porcelain powder and can meet the requirement of clinic use.