Nasu T, Matsumoto N, Noguchi H
Shika Rikogaku Zasshi. 1976 Sep;17(39):194-9.
We made fifteen kinds of Au-Pt alloy each of which contain 69% gold. We measured the changes of hardness, the deformations of these alloys caused by heat treatment and also the thermal expanison coefficient of these alloys. The results were as follows. 1. The hardness of these alloys as they were cast almost the same as that of those, hardened by heat treatment. 2. The hardest alloy, as cast or hardened by heat treatment, contained 5% platinum, 20% copper and 5% silver. 3. The ability of these alloys to be hardened and softened by heat treatment was strengthened as the amount of platinum decreased and equally as the amount of copper increased. 4. The deformation of these alloys caused by heat treatment decreased as the amount of platinum increased and equally as the amount of copper decreased. 5. The deformation caused by heat treatment of these alloys which were caset by using phosphate-bonded investment was smaller than those of those alloys were cast by using gypsum investment. 6. The thermal expansion (100 degrees C approximately 400 degrees C) of these alloys as cast was larger than that of the alloys which were heated by softening treatment. The thermal-expansion-coefficient and temperature curves of these alloys as they were cast, were at 350 degrees C in the respective maximum point. On the other hand, the thermal-expansion-coefficient and temperature curves of the alloys which were heated by softening treatment, were at 175 degrees C in the respective minimum point.
我们制备了15种金铂合金，每种合金含金69%。我们测量了这些合金的硬度变化、热处理引起的变形以及它们的热膨胀系数。结果如下：1. 这些合金铸造时的硬度与热处理硬化后的硬度几乎相同。2. 铸造时或热处理硬化后最硬的合金含5%铂、20%铜和5%银。3. 随着铂含量的减少以及铜含量的同等增加，这些合金通过热处理进行硬化和软化的能力增强。4. 随着铂含量的增加以及铜含量的同等减少，这些合金热处理引起的变形减小。5. 使用磷酸盐粘结包埋材料铸造的这些合金热处理引起的变形小于使用石膏包埋材料铸造的那些合金。6. 这些合金铸造时的热膨胀（约100℃至400℃）大于经过软化处理加热的合金。这些合金铸造时的热膨胀系数与温度曲线在350℃时各自处于最高点。另一方面，经过软化处理加热的合金的热膨胀系数与温度曲线在175℃时各自处于最低点。
