激光焊接齿科CoCr-NiCr异种合金组织结构研究Study of microstructure of laser welded dento-prosthetic CoCr-NiCr alloy
李长义,杨贤金,张连云,崔振铎
摘要(Abstract):
选用齿科烤瓷用NiCr合金和支架用CoCr合金,利用脉冲Nd-YAG激光,在不同电压下进行焊接,考察焊件力学性能,优选电压条件,研究此条件下焊件熔焊区及其附近区域化学成分、显微组织变化规律。结果表明,适合齿科临床应用焊接电压为280V,此条件下可以得到显微组织致密、细小的熔焊区,熔焊区与两侧母材呈冶金结合,主要成分为Ni元素,以固溶体和化合物形式存在;Co、Cr元素部分溶入固溶体,部分与Mo、Be形成化合物。焊接中冶金过程充分,无新相生成。双向侧吹氩气可以对熔焊区起到良好的保护作用,无氧化物形成。
关键词(KeyWords): NiCr合金;CoCr合金;激光焊接;组织结构
基金项目(Foundation): 天津市自然科学基金(043601111)
作者(Author): 李长义,杨贤金,张连云,崔振铎
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