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离子渗碳是几年前才出现的热处理技术。离子渗碳过程中的反应方式与离子渗氮相同。其基本原理是,由辉光放电而形成的等离子层在电场作用下轰击工件表面,并使碳源在工件表面分解后以原子的形式扩散入表层。由于工件表面具有很高的碳浓度及温度(使之具有高的扩散系数),因此加速了碳的扩散过程。这使离子渗碳在较短的时间即可获得比常规渗碳更深的渗层.在离子渗碳中,表面反应及表面碳势是控制渗速的因素.图1为工件置于处理炉5分及15分时的表层碳浓度分布,由此可看出离子渗碳中碳的快速扩散过程.在960℃的渗碳温度下,15分后即可得到表面碳浓度为0.9%及0.5毫米的渗层。
Ion carburization is a heat treatment technology that emerged only a few years ago. Ion carburizing reaction in the same way and ion nitriding. The basic principle is that the plasma layer formed by the glow discharge bombards the surface of the workpiece under the action of an electric field and causes the carbon source to diffuse in the form of atoms into the surface layer after being decomposed on the surface of the workpiece. As the workpiece surface has a high carbon concentration and temperature (so that it has a high diffusion coefficient), thus accelerating the carbon diffusion process. This allows ion carburization in a shorter period of time to obtain a deeper than conventional carburizing layer.In ion carburizing, surface reaction and surface carbon potential is to control the rate of infiltration.Figure 1 shows the workpiece placed in the furnace 5 Points and 15 minutes surface carbon concentration distribution, which can be seen in the rapid diffusion of carbon in ion-carburizing process at 960 ℃ carburizing temperature, after 15 minutes to get the surface carbon concentration of 0.9% and 0.5 mm Of the infiltration layer.