以ZnO - Na2O - SiO2 - Al2O3-B2O3陶瓷体系为基础,制备了添加不同摩尔比Li2O和MgO的陶瓷结合剂及立方氮化硼(cBN)磨具.利用X衍射测试仪、线性热膨胀测试仪、扫描电镜等研究了MgO∶Li2O摩尔比(M值)和烧结温度对陶瓷结合剂及磨具性能的影响.结果表明:随着M值增加,结合剂的软化点温度增加,耐火度及化学稳定性均增强,线性热膨胀系数先增加后降低.当M值为0.67时,随着烧结温度的升高,石英晶相的析出被抑制,诱导析出Mg(Zn) Al2O4晶相,且含量逐渐增加,尺寸先减小后增加；当温度为870℃时,Mg(Zn)-Al2O4晶粒尺寸最小,约为2μm,结合剂结构最为致密,抗折强度达到最大值136.28MPa.随着烧结温度的提高,cBN磨具气孔率和吸水率先降低后增加,体积密度、硬度、抗折强度、磨耗比以及磨削效率先增加后降低；当烧结温度为890℃,磨耗比及磨削效率最高,分别为98.72％和1.3675g·min-1.
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