Ti-coated diamond with different particle sizes and proper amounts of cubic boron nitride (cBN) was used to fabricate polycrystalline diamond composite (PDC) with improved wear resistance and thermal stability under high temperature and high pressure (5.5–6.5GPa, 1500–1650 °C). The ratio of Ti-coated diamond powder, cBN powder and normal diamond powder was W_30–50: W_4–8: W_0–1 = 70: 15: 15. Cobalt (Co) was used as a binder, and cemented tungsten carbide was used as a substrate to sinter a new high-performance PDC. Ti and TiC on the surface of Ti-coated diamond reacted with cBN under high temperature and high pressure to generate new ceramic phases such as TiB₂, TiN and TiN_0.3, which have high hardness and good wear resistance. Compared with the conventional PDC, the impact toughness and wear resistance of PDC with Ti-coated diamond and cBN addition were enhanced by 19% and 28%, respectively. The ceramic phase acts as a protective barrier, which enhances the initial graphitization and oxidizing temperature to 942–950 °C, which were 162–170 °C higher than the conventional PDC. The new ceramic barrier wrapped around the surface of the diamond and Co after the formation of the D-D (diamond-diamond) bonding will give priority to the oxidation reaction of Co and diamond with oxygen, which prohibits cobalt-catalytic graphitization of diamond, meeting the needs of PDC thermal stability and wear resistance in the field of drilling.

使用具有不同粒径和适量立方氮化硼（cBN）的钛涂层金刚石来制造多晶金刚石复合材料（PDC），该复合材料在高温和高压（5.5–6.5GPa，1500–1650）下具有更高的耐磨性和热稳定性。 °C）。钛涂层金刚石粉末，cBN粉末和普通金刚石粉末的比例为W _{30 – 50}：W _{4 – 8}：W _{0 – 1}  = 70：15：15。钴（Co）用作粘合剂，硬质合金钨硬质合金被用作烧结新型高性能PDC的基材。Ti涂层金刚石表面上的Ti和TiC在高温高压下与cBN反应生成新的陶瓷相，如TiB ₂TiN和TiN _0.3，具有高硬度和良好的耐磨性。与常规PDC相比，添加Ti涂层金刚石和cBN的PDC的冲击韧性和耐磨性分别提高了19％和28％。陶瓷相起到保护层的作用，可将初始石墨化和氧化温度提高到942-950°C，比常规PDC高162-170°C。形成DD（金刚石-金刚石）键后，新的陶瓷阻挡层包裹在金刚石和Co的表面，将优先考虑Co和金刚石与氧气的氧化反应，这将阻止钴的催化石墨化，从而满足金刚石的要求。钻探领域对PDC的热稳定性和耐磨性的需求。