牙用烤瓷支架钴铬钼合金热膨胀系数的测定

The Study of the Thermal Expansion Coefficient of a Kind of Co-Cr-Mo Framework and Ceramic Alloy

目的为DA94合金的研制及临床应用提供热膨胀系数的实验依据。方法用DA94合金制作直径3.0mm×20.0mm圆柱状试件2个,两端平齐。在TMA2940型热机械分析仪上绘制从室温到700℃的热膨胀曲线,升温速度10℃/min。计算温度范围ΔT在25～500℃的热膨胀系数。结果DA94合金热膨胀系数为13.915×10-6/℃(@500℃)。结论DA94合金的热膨胀系数与临床常用瓷粉VITAVMK95瓷粉匹配良好,可满足临床要求。

Objective To investigate the thermal expansion coefficient of the Co-Cr-Mo alloy, and for clinic use. Methods The two column speeiments which Ф3,0 mm× 20 mm were casted with DA9-4 Co-Cr-Mo alloy. And then protract the thermal expansion curve with the TMA2940 thermal analysis instntment, Results The thermal expansion coefficient of the Co-Cr-Mo alloy is 13,915 × 10^-6/℃ （ @ 500 ℃ ）. Conclusion The result showed that the alloy has good matching with the VITA VMK95 porcelain powder and can meet the requirment of clinic use.