【摘要】 以硅溶胶、铝溶胶及化学纯H₃BO₃、NaNO₃、LiNO₃为原料,以溶胶凝胶法制备Al₂O₃-B₂O₃-SiO₂-R₂O体系无机溶胶陶瓷结合剂,并以金刚石为磨料,采用喷雾干燥法制备金刚石-陶瓷复合粉体,后经干燥、压制、烧结制得金刚石-陶瓷复合烧结体。利用X射线衍射仪、TG-DSC、扫描电镜、抗折试验机等表征手段对无机溶胶陶瓷结合剂的物相组成、显微形貌、复合烧结体断面形貌及抗弯强度等进行分析。结果表明,820℃/1h下进行烧结,以此配方制备的无机溶胶陶瓷结合剂结构均匀,且可熔融为液相并对金刚石进行较好地包覆。随着陶瓷结合剂含量的增加,金刚石-陶瓷复合烧结体的抗弯强度随之提高,而气孔率随之降低,且当结合剂含量为30wt%时,抗弯强度和气孔率分别为95.42MPa和34.36%。更多还原

【Abstract】 Using silica sol,alumina sol and chemical pure H₃BO₃,NaNO₃,LiNO₃ as raw materials,the sol-gel method was used to prepare Al₂O₃-B₂O₃-SiO₂-R₂ O inorganic sol ceramic binder,and then based on the diamond,spraying drying method was used to prepare diamond-vitrified bond composite powders and then the bulk samples were obtained after pressing and sintering the powders.The phase compositions,microstructure,fracture morphology,bending strength of the inorganic sol ceramic binder and sintered samples were characterized by X-ray diffraction,TG-DSC,scanning electron microscopy and motorized bending tester.Results showed that the ceramic binder heated at 820℃ for 1 hour,the binder has uniform structure and can be melted into a liquid phase to better coating the diamond.With the increase of binder content,the bending strength of the diamond-vitrified increases,while the porosity decreases.When the binder content is30 wt%,the bending strength and porosity are 95.42 MPa and 34.36%.更多还原