Journal of The Japan Society of Electrical Machining Engineers

Show abstractHide abstract

Surface treatment is widely applied to industrial products as a method of improving the properties of material surfaces. Plasma spraying is a surface treatment method that allows a wide range of material selection and enables the formation of ceramics and plastics, as well as metals. On the other hand, implant materials are substitute materials to supplement a damaged human body. Typical examples are artificial knee joints, artificial hip joints and artificial tooth roots. In this study, we applied the plasma spraying technique to implant materials and evaluated the coated surface. The results of the experiment are as follows: (1) The surface treated by the improved plasma spraying had a good film with low porosity and the adhesion was improved compared with that by the conventional plasma spraying. (2) The results of absorbance measurement showed that the hydroxyapatite (HAp)–sprayed specimen has higher absorbance than that of the general treatment applied to implant materials. The biocompatibility is expected to be good.

View full abstract

Download PDF (1870K)

Electrical discharge machining (EDM) is a useful method for machining hard materials such as cemented carbide. However, in the equipment used in sinking electrical discharge machining (SEDM), the electrodes wear and can become exhausted during use. It is necessary to prepare several electrodes in advance of machining. We developed a new SEDM method that uses a feeding wire electrode. It is named wire electrical discharge (WED) milling. By this method, the machining is similar to mechanical milling with a ball end mill, but is free from problems such as tool wear or the built-up edge in mechanical milling. In this paper, the machining of various shapes was carried out on cemented carbide using the WED milling method. In addition, a transistor control capacitor electrical discharge circuit was used when machining cemented carbide, with the purpose of improving the machining speed.

View full abstract

Register with J-STAGE for free!