陶瓷空心微球对孕镶金刚石钻头胎体性能的影响研究

Effect of ceramic hollow microspheres on the performance of impregnated diamond bits

摘要:

针对深井钻进中，钻头受高温环境影响，钻头胎体性能显著下降的技术难题，研究了空心球种类、空心球目数、空心球添加量等对热压烧结金刚石钻头胎体常温及高温力学性能的影响。结果表明：在胎体基体内添加空心球，宜添加3540目数的钇稳定的氧化锆空心球；当钇稳定的氧化锆空心球的添加量为10%时，胎体的综合性能达到最佳，冲击韧性和抗弯强度也达到最大值，分别为3 J/cm2和903.75 MPa。添加适量空心球的胎体复合材料，由于球形孔隙结构的存在，使得胎体表面粗糙度得到增强，提高了金刚石钻头的胎体出刃性能、高温下的力学性能。

Abstract:

In view of the technical problem that performance of the drill bit carcass decreases significantly due to the high temperature environment in drilling of deep wells, studies were conducted on the effect of the type of hollow spheres, the number of hollow spheres, and the adding amount of hollow spheres on the mechanical properties of the hot-pressed sintered diamond drill bit at ambient temperature and high temperature. The results showed that the 3540 mesh yttrium-stabilized zirconia hollow spheres were suitable to be added in the matrix of the carcass, and when the addition amount of yttrium-stabilized zirconia hollow spheres was 10%, the overall performance of the carcass reached the best. The impact toughness and flexural strength also reached their maximum values of 3J/cm2 and 903.75MPa, respectively. Addition of an appropriate amount of hollow spheres to the carcass composite will enhance the surface roughness of the carcass, and improve the cutting performance of the diamond carcass and the mechanical properties at high temperatures due to presence of the spherical pore structure.