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一、前言用粉末冶金方法制造硬质合金在历史上划时代的发明是1923年Karl Schroter提出的德国专利〔1〕。1926年以Widia为商品牌号出售WC与Co相结合的WC-6％Co合金是硬质合金工业生产的开端。1928年美国、日本也开始生产。在德国,WC-6％Co系合金为G类,用于切削铸铁。其中添加少量VC和TaC的细颗粒WC合金为H类,自1929年用于切削高硬度铸铁等。此外还发展增加含Co量的高韧性合金,至今仍将～30％Co合金用做耐磨、耐冲击的矿山用工具。此外,还开辟了用WC-Co系合金难切削钢的应用系列,即1931年开始市售的含TiC的WC-TiC-Co合金(德
I. INTRODUCTION The epoch-making invention of cemented carbide by powder metallurgy was the German patent [1] proposed by Karl Schroter in 1923 [1]. The sale of WC-6% Co, a combination of WC and Co, by Widia in 1926, marks the beginning of industrial production of cemented carbide. In 1928 the United States, Japan also began production. In Germany, WC-6% Co alloys are class G for cutting cast iron. Which add a small amount of VC and TaC fine particles of WC alloy H class, since 1929 for cutting high hardness cast iron and so on. In addition, the development of high toughness alloys that increase the amount of Co is still used up to ~ 30% Co alloy as a wear and impact resistant mine tool. In addition, also opened up with WC-Co alloy hard-to-cut steel application series, that is, commercially available in 1931 with the TiC WC-TiC-Co alloy