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STRUCTURE OF DENTAL GALLIUM ALLOYS

机译：牙科镓合金的结构

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The interest in gallium alloys as a replacement for amalgam has increased in recent years due to the risk of environmental pollution from amalgam. Alloy powders with compositions close to those for alloys of amalgam are mixed with a liquid gallium alloy. The mix is condensed into a prepared cavity in much the same way as for amalgam. The aim of the present work was to study the structure of: (1) two commercial alloy powders containing mainly silver, tin and copper, and (2) the phases formed by mixing these powders with a liquid alloy of gallium, indium and tin. One of the alloy powders contained 9 wt% palladium. Cross-sections of cylindrical specimens made by these gallium mixes were investigated by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Discrete grains of the following phases were found to be present in both gallium alloys: hexagonal Ag2Ga, tetragonal Cu(Pd)Ga-2, cubic AggIn4 and tetragonal beta-Sn. Indications of hexagonal or orthorhombic Ag2Sn were found in the remaining, unreacted alloy particles. In the palladium-containing alloy the X-ray reflections indicate a minor fraction of cubic CugGa4 in addition to the Cu(Pd)Gap phase. Particles of beta-Sn are probably precipitated because Sn-Ga phases cannot be formed according to the binary phase diagram. (C) 1996 Elsevier Science Limited [References: 19]
机译：近年来，由于汞合金有可能污染环境，因此人们对镓合金替代汞合金的兴趣有所增加。将组成与汞齐合金接近的合金粉末与液态镓合金混合。混合物以与汞合金几乎相同的方式冷凝到准备好的腔中。本工作的目的是研究以下结构：（1）主要包含银，锡和铜的两种市售合金粉末，以及（2）通过将这些粉末与镓，铟和锡的液态合金混合而形成的相。一种合金粉末包含9重量％的钯。通过扫描电子显微镜，能量色散谱和X射线衍射研究了由这些镓混合物制成的圆柱形试样的横截面。发现在两种镓合金中均存在以下相的离散晶粒：六方Ag2Ga，四方Cu（Pd）Ga-2，立方AggIn4和四方β-Sn。在剩余的未反应的合金颗粒中发现了六方或正交的Ag2Sn。在含钯合金中，X射线反射表明除了Cu（Pd）Gap相之外，还有少量的立方CugGa4。由于根据二元相图无法形成Sn-Ga相，因此可能会沉淀出β-Sn颗粒。 （C）1996 Elsevier Science Limited [参考号：19]

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