论文部分内容阅读
第一讲 常用热喷涂技术的原理和特点(续) 三、等离子喷涂技术 1.普通等离子喷涂技术 等离子喷涂是以等离子弧为热源,将喷涂材料加热到熔融状态并高速喷射在基体表面形成涂层。图6为等离子喷涂原理示意图。上以后,并不能立即产生电弧,还需要在前枪体与后枪体之间并联一个高频电源。高频电源接通使钨极端部与前枪体之间产生火花放电,于是电弧被引燃。电弧引燃后,切断高频电路。引燃后的电弧在孔道中受到三种压缩效应,温度升高,喷射速度加大,此时往前枪体的送粉管中输送粉状材料,粉末在等离子焰流
First, the principle and characteristics of commonly used thermal spraying technology (continued) Third, plasma spraying technology 1. General plasma spraying technology Plasma spraying is a plasma arc as a heat source, the spray material is heated to a molten state and high-speed jet coating on the surface of the substrate . Figure 6 is a schematic diagram of plasma spraying. On the future, and can not immediately produce arc, but also need to be in front of the gun body and the gun body in parallel with a high-frequency power supply. The high-frequency power is turned on so that a spark discharge occurs between the tip of the tungsten and the front gun body, and the arc is ignited. After the ignition of the arc, cut off the high-frequency circuit. After the ignition of the arc in the tunnel by the three compression effects, the temperature increases, the injection speed increases, this time forward gun body powder feed powder conveying powder, powder in the plasma flame flow