BMI树脂CBN超精油石制备及性能研究

以丙酮为溶剂溶解BMI树脂,将制成的树脂液与CBN磨料按比例混合均匀形成料浆,浇注成型后加热挥发丙酮并使树脂固化制备CBN超精油石.从油石微观结构上分析了丙酮的最佳用量,结果表明:丙酮用量低于16.9%时,无法将CBN磨料与BMI树脂混合均匀;丙酮用量为23.4%～29.0%时,可制备成均匀稳定的料浆;丙酮用量高于33.8%时,料浆中的CBN磨料会连续沉降.另外,当丙酮用量为23.4%时,BMI树脂比例在7%～16%范围内随着含量的增加油石强度和硬度增大,超过16%时粘度的增加将导致丙酮不易挥发,油石中存在大量的气孔,其强度和硬度均反而降低.

The Rearch for Preparation and Performances of BMI Resin CBN Precision Whetstone

BMI resin solution synthesized by using BMI resin and the solvent of acetone was mixed with CBN abrasive in proper proportion to prepare slurry, and then the whetstone was prepared with the process of casting, acetone evaporating and resin curing. The best dosage of the acetone was analyzed with the microstructure of the whetstone. Experiment results have shown that, when the content of acetone is under 16.9%, the CBN abrasive is not well-distributed in the BMI resin. However, when the content of acetone is 23.4%~29.0%, the CBN abrasive distributes uniformly. Nevertheless, as the content of acetone was up to 33.8%, the CBN abrasive deposits in the BMI resin. In addition, when the content of acetone is 23.4% and the BMI resin content is in the region of 7%~16%, the flexure strength and hardness of the whetstone are reinforced with the increase of the content of BMI resin. If the content of BMI resin is beyond 16%, it is difficult to volatilize the acetone as the viscosity of slurries increases, which results in the increase of the porosity and the decrease of the flexural strength and the hardness of the whetstone.