对苯二甲酸二甲酯成孔剂对β-SiC超精油石性能影响研究

Effect of Dimethyl Terephthalate Pore Former on Properties of β-SiC Super Essential Oil Stone

以β-SiC微粉为原料,陶瓷结合剂为粘结剂,对苯二甲酸二甲酯(DMT)为成孔剂,采用无压烧结工艺制备出性能优异的新型超精油石,研究了DMT含量对β-SiC超精油石气孔率、孔隙结构、力学性能及微观组织结构的影响。结果表明:当DMT添加量为4wt%时,油石气孔率为53.4%,气孔尺寸主要为2~4μm,占比孔隙体积78%,抗弯强度为21.5 MPa,洛氏硬度为55.9 HRH,冲击韧性为1.21 kJ/m^2,气孔孔径细小且呈弥散均匀分布。该油石在金属表面尤其是轴承沟道磨抛加工过程中,可高效率的获得光洁度高、拉丝纹路均匀的产品表面。

The β-SiC micropowder was used as the raw material, the ceramic binder was used as the binder, and dimethyl terephthalate(DMT) was used as the pore forming agent. The new super essential oil stone with excellent performance was prepared by the pressureless sintering process. The effects of DMT content on the porosity, pore structure, mechanical properties and microstructure of β-SiC super essential oil stone were studied. The results show that when the amount of DMT added is 4 wt%, the porosity of the oil stone is 53.4%, the pore size is mainly 2-4 μm, the specific pore volume is 78%, the flexural strength is 21.5 MPa, the Rockwell hardness is 55.9 HRH, the impact toughness is 1.21 kJ/m^2 and the pore diameter is fine and uniformly distributed. The oil stone can obtain high-quality surface of the product with high smoothness and uniform texture on the metal surface, especially in the process of bearing channel grinding and polishing.