反相微乳液法制备球形金刚石堆积磨料与性能研究

Preparation and properties of spherical diamond stacked abrasives by inverse microemulsion method

以无机硅溶胶为结合剂,金刚石微粉为单颗粒磨料,以异辛醇、无水乙醇、OP-10的混合液为微乳液体系,采用反相微乳液法制备球形陶瓷结合剂金刚石堆积磨料。利用扫描电镜、表面粗糙度仪等表征手段考察不同结合剂量对球形金刚石堆积磨料的显微结构、抛光性能影响。结果表明,采用反相微乳液法能获得球形度较好的金刚石堆积磨料。在660℃下烧结,异辛醇等有机物能充分分解,溶胶结合剂以薄膜的形式对金刚石颗粒进行较好的包覆,堆积磨料粒径可控制在50～100μm。抛光实验表明,随着结合剂量的增加,抛光速率先增大后减小,在结合剂含量为50%(质量分数)左右时加工效率最高,玻璃表面粗糙度先减小后增大,在结合剂量为55%(质量分数)左右时,工件的表面一致性较好,粗糙度最低,约为Ra0.095μm。

Inverse microemulsion method was used to prepare spherical ceramic binder diamond stacked abrasives with inorganic sol as the binder,ordinary diamond powder as single grain abrasive,and 2-ethylhexanol,ethanol and OP-10 as the microemulsion,respectively.The effects of different binder dosage on the fronts of microstructure and polishing performance of spherical diamond stacked abrasive were characterized by scanning electron microscopy,surface roughness tester,and other methods.Results show that at the temperature of 660℃,2-ethylhexanol and other organic substances could be fully decomposed,and the diamond particles could be coated by sol binder in the form of thin film.Diamond stacked abrasives with better sphericity could be obtained inverse microemulsion method,and their grain sizes could be controlled in 50-100μm.Polishing experiments show that with the increase of binder content,the polishing rate increased first and then decreased.When the binder content was about 50 wt%,the processing efficiency was highest,and the surface roughness of the glass decreased first and then increased.When the binder dose was about 55 wt%,the surface consistency of the glass workpiece was good with the lowest roughness of about 0.095μm.