【摘要】 分别采用纯氩和氩-氮混合气作为离子气,对SiCp/6061复合材料进行了等离子弧焊研究。在对颗粒分布均匀性的数学表征进行理论分析的基础上,探讨了等离子弧焊对SiC颗粒在复合材料中分布均匀性的影响规律。结果表明,等离子弧焊使SiCp/6061复合材料中SiC增强颗粒的分布均匀程度发生了明显变化。在焊接熔池中不仅颗粒的量明显减少,颗粒分布的均匀性也显著降低。采用氩-氮混合气体代替纯氩气作为焊接的离子气,SiC颗粒烧损和团聚可在一定程度上得到抑制。更多还原

【Abstract】 Plasma arc welding of SiC_p/6061 composite has been studied as argon or argon-nitrogen mixture has been employed as plasma gas.According to the theoretical analysis of the mathematical characterization of particle distribution uniformity,the influence of plasma arc welding on the distribution uniformity of SiC particles in the composite has been examined.It is proposed that the distribution uniformity of SiC particles has changed significantly after plasma arc welding.In the welding region,the distribution uniformity of SiC particles has decreased while there are much less particles than before welding.However,the decrease as well as the aggregation of SiC particles can be somewhat restricted as argon-nitrogen mixture rather than pure argon has been employed as plasma gas.更多还原