【摘要】 以微米级金刚石微粉为初始材料,利用自主研发的二级6–8型超高压大腔体装置,不添加黏结剂,在15GPa左右条件下制备了超硬、高韧的厘米级块体聚晶金刚石,聚晶块体由高压硬化所致的、具有纳米亚结构的微米级金刚石颗粒组成。该材料的维氏硬度与单晶金刚石的最高维氏硬度（～120GPa）相当,断裂韧性(18.7MPa·m^1/2)可媲美高性能硬质合金。更多还原

【Abstract】 Using micro-grained diamond powder as starting material,centimeter-sized super-strong micro-grained polycrystalline diamond（MPD）compacts have been prepared under about 15 GPa with a lab-designed two-stage 6-8 type multi-anvil large volume high pressure apparatus.The polycrystalline bulk is composed of micron diamond particles with nano-substructure induced by work hardening under high pressure.The Vickers hardness of the MPD bulk can reach the top limit of the single crystal diamond（about 120GPa）.The fracture toughness of MPD sample is as high as 18.7MPa·m^1/2,which is similar to that of high performance tungsten carbide material.更多还原