一、前言石墨材料以高的热稳定性、适中的密度、高的强度和均匀的微晶结构为特征,在放电加工中得到了广泛应用。特别在电火花加工型腔膜具(如锻模、压铸模和塑料模等)方面被选为一种主要的电极材料。随着电火花加工技术的迅速发展,电火花石墨材料的研制工作正积极地开展起来。我国大约从七十年代开始这项研制工作,取得了较好的成绩,现在已生产出十余个品种的电火花石墨电极。据我 I. INTRODUCTION Graphite materials are characterized by high thermal stability, moderate density, high strength and uniform microcrystalline structure and are widely used in EDM. In particular, it has been selected as a major electrode material for EDM die cavities such as forging dies, die-casting dies and plastic dies. With the rapid development of EDM technology, the development of EDM graphite materials is being carried out actively. About 70 years since the beginning of this research and development work in our country, and achieved good results, now has produced more than ten varieties of EDM graphite electrodes. As far as I