FeCrBSiNb粉芯丝材电弧喷涂的弧区动态行为

发布时间：2018-05-26 08:39

本文选题：电弧喷涂 + 粉芯丝材　；参考：《中国表面工程》2015年01期

【摘要】：电弧喷涂粉芯丝材是由金属外皮包覆金属或非金属的复合粉末组成,喷涂过程中在弧区发生冶金反应并雾化成熔滴,大量熔滴沉积在基体表面最终形成涂层。粉芯丝材的电弧喷涂是一个高度动态的传热传质过程,采用高速摄像技术研究了喷涂过程中两根粉芯丝材交汇处的电弧、丝材熔化与熔滴形成等行为。另外,通过高速摄像试验分析了喷涂电流和电压对电弧形态及丝材熔化的影响规律。结果表明:喷涂时间歇出现燃弧、熄弧、再燃弧的循环变化;不同于实心丝材,粉芯丝材在阴阳极上的电弧都发散,这有利于丝材外皮和粉芯间的冶金反应;阴极丝材主要表现为抽吸作用下以细小熔滴或片状挤出物等形式形成熔滴,阳极丝材主要以片状液带的形式脱离并雾化成小熔滴。
[Abstract]:Arc spraying powder cored wire is composed of metal coated metal or nonmetallic composite powder. Metallurgical reaction occurs in the arc zone and atomized into droplet during spraying. A large number of droplets are deposited on the surface of the substrate to form a coating. The arc spraying of powder core wire is a highly dynamic heat and mass transfer process. The behavior of arc, wire melting and droplet formation at the junction of two powder core wires during the spraying process is studied by high speed camera technique. In addition, the effect of spraying current and voltage on arc shape and wire melting was analyzed by high speed camera test. The results show that the arc burning, arc extinguishing and reburning arc cycle change in spray time, and the arc divergence of powder core wire is different from that of solid wire, which is beneficial to the metallurgical reaction between the outer surface of wire and powder core. The cathode wire mainly forms droplet in the form of fine droplet or sheet extrusion under the action of suction, while the anode wire is mainly separated and atomized into droplet in the form of sheet liquid strip.
【作者单位】：装甲兵工程学院机械产品再制造国家工程研究中心;装甲兵工程学院再制造技术重点实验室;
【基金】：国家自然科学基金(51105377,51375492) 北京市优秀博士论文指导老师科研项目(20129003401)
【分类号】：TG174.442

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