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基于在WC-Co基体中加入纳米Al2O3强化硬质合金性能的设想,对几种配方的纳米Al2O3-硬质合金复合材料进行了力学性能测试、耐磨耐冲击试验和微观组织结构的分析研究。结果表明,加入适量的纳米Al2O3不但可细化合金晶粒,使材料组织结构更加均匀,耐磨性能提高,而且增强了WC晶界的强度,使得材料的断裂形式由沿晶断裂转向穿晶断裂,起到增强补韧的作用。同时,加入稀土也提高了材料的综合性能。将纳米复合材料制成钻齿并装配成钻头进行了现场试验,与硬质合金齿钻头相比,其破岩效率提高20%,使用寿命提高80%。
Based on the idea of adding nano-Al2O3 into the WC-Co matrix, the mechanical properties, wear-resistant and impact-resistant properties and microstructure of nano-Al2O3-cemented carbide composites with several formulations were studied. The results show that adding appropriate amount of nano-Al2O3 can not only refine the alloy grains, make the structure of the material more uniform and improve the wear resistance, but also increase the strength of the WC grain boundary, which makes the fracture mode of the material change from intergranular fracture to transgranular fracture , Play a role in enhancing the toughness. At the same time, adding rare earth also improves the overall performance of the material. The nanocomposites were made into drill bits and assembled into bits for on-site testing. Compared with the carbide bit, the rock breaking efficiency was increased by 20% and the service life was increased by 80%.