Surface modification process by electrical discharge machining with a Ti powder green compact electrode
Surface modification process by electrical discharge machining with a Ti powder green compact electrode
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DOI：
10.1016/s0924-0136(02)00597-6
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发表时间：
2002-10
影响因子：
6.3
通讯作者：
Zhiguo Wang;Yu Fang;P. Wu;Wansheng Zhao;K. Cheng
中科院分区：
文献类型：
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作者：
Zhiguo Wang;Yu Fang;P. Wu;Wansheng Zhao;K. Cheng
介绍了一种利用电火花加工进行表面改性的新方法。在普通电火花加工机床上，以煤油为工作液，在一定条件下，用钛或其它粉末压制电极，在工件表面形成硬质陶瓷层。这种革命性的新方法被称为放电涂层（EDC）。电火花放电加工的过程是从电极材料的磨损开始的，在高温下煤油液分解出的碳颗粒与电极材料发生化学反应生成硬质碳化物。碳化物迅速堆积在工件上，几分钟内就变成了一层约20μm厚的硬质陶瓷层。本文系统地研究了钛粉绿色致密电极电火花放电的原理和过程。实验和分析表明，该工艺可在金属工件表面形成致密的TiC陶瓷层。陶瓷层的硬度比基体高3倍以上，且硬度从表面到基体逐渐变化。该方法在刀具、模具的表面修复和强化等表面改性领域具有广泛的应用前景。
This paper describes a new method of surface modification by electrical discharge machining (EDM). By using an ordinary EDM machine tool and kerosene fluid, a hard ceramic layer can be created on the workpiece surface with a Ti or other compressed powder electrode in a certain condition. This revolutionary new method is called electrical discharge coating (EDC). The process of EDC begins with electrode wear during EDM, then a kind of hard carbide is created through the chemical reaction between the worn electrode material and the carbon particles decomposed from kerosene fluid under high temperature. The carbide is piled up on a workpiece quickly and becomes a hard layer of ceramic of about 20μm thickness in several minutes. This paper studies the principle and process of EDC systemically by using a Ti powder green compact electrode. Experiments and analyses show that a compact TiC ceramic layer can be created on the surface of the metal workpiece. The hardness of the ceramic layer is more than three times higher than that of the base body, and the hardness changes gradually from the surface to the base body. This method can find wide application in the fields of surface modification, such as the surface repairing and strengthening of cutting tools and molds.