美国一项专刮（专利号吧071473）提出一种含C。3～20％（质量）的WC－C。硬质合金，该合金的特点是采取WC粉颗粒分级方法，达到合金组织均匀化。WC粉颗粒分级是：平均WC粒度为＞20Pm，但不允许有粒度小于平均粒度0．SPm的颗粒，也不允许有粒度为WC平均粒度05～2倍的颗粒。按费 United States a scratch (patent number 071473) proposed a containing C. 3 to 20% (mass) of WC-C. Carbide, the alloy is characterized by WC powder particles grading method to achieve uniform alloy structure. WC powder particle classification is: average WC particle size> 20Pm, but not allowed to have a particle size less than the average particle size 0. SPm particles, nor does it have a particle size of WC average particle size of 05 to 2 times the particles. Press fee