大直径刀具用聚晶金刚石复合片的研制

摘要

采用纳米结合剂技术，选用双峰值分布的高品级金刚石微粉，在六面顶压机上合成了ϕ55 mm 刀具用聚晶金刚石复合片。经性能测试，磨耗比在23万以上；在700℃保温2 min 的条件下，具有很好的热稳定性；经超声波微成像分析，样品无分层、裂纹、气孔、夹杂、金刚石厚度不均等缺陷；制成刀具后，在切削硬质合金时，样品与国外同类产品性能相当。%ϕ55 mm PCD compacts were synthesized on cubic press using 2-peak high quality diamond powder with nano catalyst The compacts were made into cutting tools to test the performance Results showed that abrasive ratio was more than 230 000 The compact performed good thermal stability at 2 min and 700 ℃ Micro ultrasonic image indicated that there were no defects such as delamination crack inclusion When used to cut the tungsten carbide the performance of samples could be comparable to similar with foreign products.