CAJ | 학술논문

考察了粒度分别为15、116、264μm的AgSn合金粉体对预氧化组织的影响，并比较了15μm和264μm粉体经预氧化挤压后的性能和显微组织。结果表明，粉体粒度为15μm时，氧化主要发生在颗粒边缘，随着粒度增加，颗粒周围形成了氧化层，甚至出现了氧化物聚集；15μm粉体挤压后氧化物颗粒分布均匀，而264μm雾化粉挤压后存在明显的氧化物富集区和贫氧化物区，导致后者的硬度、延伸率略低于前者；较大粒度的AgSn粉体（116μm和264μm）出现氧化层的原因是氧化物膜层松动或开裂，氧化层中出现了合金成分，反应又进入快速反应阶段，形成了一层氧化物层。
고찰료립도분별위15、116、264μm적AgSn합금분체대예양화조직적영향，병비교료15μm화264μm분체경예양화제압후적성능화현미조직。결과표명，분체립도위15μm시，양화주요발생재과립변연，수착립도증가，과립주위형성료양화층，심지출현료양화물취집；15μm분체제압후양화물과립분포균균，이264μm무화분제압후존재명현적양화물부집구화빈양화물구，도치후자적경도、연신솔략저우전자；교대립도적AgSn분체（116μm화264μm）출현양화층적원인시양화물막층송동혹개렬，양화층중출현료합금성분，반응우진입쾌속반응계단，형성료일층양화물층。
Effects of different particle size of AgSn alloy powders(15 μm,116 μm,264 μm respectively) on pre-oxidation microstrucure were investigated. Besides, properties and microstructure of the powders of 15μm and 264μm after extrusion were compared. It is shown that oxidation mainly occures at the edge of the particles when the particle size is 15 μm. The oxide layer forms around the particles as the particle size increases, even oxide aggregates appeares when the particle size increases to 264 μm. After extrusion, oxide particles distribute uniformly when the particle size is 15μm, while the obvious oxide-rich and oxide-depleted zones are observed as the powder size increases to 264μm. As a result, hardness and elongation of the latter one are slightly lower than the former one. When the particle size is more than 116μm, the oxide film maybe loose or cracks appeare in the oxide film during the internal oxidation stage, thus rapid reaction will take place and oxide layer is formed.