纳米SiO2/环氧树脂金刚石磨块的制备与性能

以液态环氧树脂为结合剂、金刚石为磨料、纳米SiO₂为增强材料, 采用浇注法制备了金刚石磨块, 并研究了其性能。结果表明: 促进剂与成型料的总质量比0.25%、固化工艺为130℃/4 h+160℃/2 h时, 磨块可获得较好的固化效果; 金刚石表面经过硅烷偶联剂或镀Ni处理均可提高磨块的耐磨性, 磨削比分别提高15.0%和32.5%; 添加经硅烷偶联剂改性后的纳米SiO₂可均匀分散于磨块体系中, 起到质点增强的作用, 且其质量分数为4%时, 磨块的抗弯强度和洛氏硬度最大, 分别达到106 MPa和HRB 56。

Preparation and properties of nano-SiO2/epoxy resin diamond whetstone

Using liquid epoxy resin as the bond, diamond as the abrasive, nano-SiO 2 as the reinforcement, diamond whetstones were prepared by casting process, and the properties were studied. The results show that with the addition of 0.25% mass fraction of accelerant, whetstones can be cured at 130℃/4 h + 160℃/2 h. As diamond modified by silane coupling agent or Ni-coated, the wear resistance of whetstone is improved by 14.9% or 32.8%, respectively. When nano-SiO 2 modified by silane coupling agent are dispersed in the whetstone, the bend strength of whetstone can be improved. While the addition amount is 4%, the flexural strength and hardness of the biggest achieve 106 MPa and 56 HRB, respectively.