ZnO-Al2O3-B2O3-SiO2系微晶玻璃结晶行为及对金刚石磨料的润湿性

为改良微晶玻璃结合剂，以熔融法制备锌铝硼硅系微晶玻璃，研究硼硅比和烧结工艺对其热学、力学性能，析晶行为，显微结构及对磨料的润湿性的影响。发现:硼含量增多，锌铝硼硅系玻璃的热膨胀系数升高、耐热性下降、抗弯强度先升高后降低；硼含量过高时，结合剂完全包覆磨料，不利于磨削加工。另一方面，硅含量增多，玻璃的黏度增大、对磨料的润湿性能变差；硅含量过高时，试样抗弯强度不足。ZABS系微晶玻璃的最佳配比w_B:w_Si=1:1。热处理工艺为710℃时保温2 h，得到的试样的热膨胀系数为5.132 7×10-6℃-1，抗弯强度达78 MPa，对磨料的润湿性好。 

Crystallization of ZABS glass and its wettability on diamond abrasive

To modify glass-ceramic bond, ZnO-Al₂O₃-B₂O₃-SiO₂ (ZABS) glass was prepared by conventional melting method. The influence of boron-silicon ratio and sintering process on its thermal and mechanical properties, as well as crystallizing behavior was discussed. The microstructure of the glass and its wettability on diamond abrasive were studied. Results show that with increased boron content, the thermal expansion coefficient of glass increases and its thermal resistance decreases, while bending strength first increases and then decreases. Too much boron will make the bond cover the grain entirely, which is bad for grinding. It is also found that with increased silicon content, the viscosity of glass increases, thus leading to poor wettability to grains. Too much silicon leads to poor bending strength. In conclusion, the best boron-silicon ratio of ZABS glass is 1:1 in weight, and the optimized heat treatment is 710℃ for 2 h. The glass would have a thermal expansion coefficient of 5.132 7×10-6℃-1 and a bending strength of 78 MPa, as well as good wettability to grains.