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首页> 外文期刊>Dental Materials Journal >Tarnish resistance evaluation of experimental Pd-free Ag-Au-Pt-Cu dental alloys
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Tarnish resistance evaluation of experimental Pd-free Ag-Au-Pt-Cu dental alloys

机译：实验性无钯Ag-Au-Pt-Cu牙科合金的耐变色性评估

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This study evaluated the tarnish resistance of eight experimental Pd-free Ag-Au-Pt-Cu dental alloys in a 0.1% Na_(2)S aqueous solution at 37°C. Color measurements of the plate samples were made using a computerized spectrophotometer before and after immersion in the test solution for up to 72 hours. Tarnish discoloration was evaluated using the color difference vector, ΔE *, in the CIELAB color space. Microstructural observation of each sample through an optical microscope revealed the matrix phase as the major constituent and second-phase small grains in the matrix phase. Selective tarnish discoloration occurred in the matrix, and fractional area of the matrix to the whole surface area was influenced by the sum of Au and Ag concentrations. The ΔE * value significantly decreased with increasing Au/(Au+Ag) atomic ratio. In conclusion, the Au/(Au+Ag) ratio in an alloy and the fractional area of the matrix were found to be primary and auxiliary factors affecting the tarnish resistance of the experimental alloys.
机译：这项研究评估了37种0.1％Na_（2）S水溶液中8种无Pd Ag-Au-Pt-Cu牙科合金的耐变色性。板样品的颜色测量是在浸入测试溶液中长达72小时之前和之后使用计算机分光光度计进行的。在CIELAB色彩空间中，使用色差矢量ΔE *评估了油漆变色。通过光学显微镜对每个样品的显微结构观察显示，基质相是主要成分，而第二相小晶粒则在基质相中。基体中发生选择性的锈蚀变色，并且基体相对于整个表面积的分数面积受Au和Ag浓度之和的影响。 ΔE*值随着Au /（Au + Ag）原子比的增加而显着降低。总之，发现合金中的Au /（Au + Ag）比和基体的分数面积是影响实验合金耐变色性的主要和辅助因素。

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