采用非均相沉淀法在3 mol％氧化钇稳定的氧化锆粉体表面包覆0.5％～1.5％(质量分数)的Al2O3,研究了包覆Al2O3对3Y-TZP陶瓷的致密化及时效敏感性的影响.实验采用热膨胀仪测定氧化锆生坯的致密化过程,生坯经1450℃烧结致密化后,测试烧结体的密度、平均晶粒直径和机械性能.采用XRD、SEM表征材料的显微组织.结果表明:相比于传统的共沉淀法,通过表面包覆的方式向氧化锆中加入少量的Al2O3更能促进3Y-TZP陶瓷的烧结致密化.表面包覆少量Al2O3的3Y-TZP可在1350～1400℃烧结致密化.此外,表面包覆Al2O3能显著降低3Y-TZP陶瓷的时效敏感性,这与大量Al3+在3Y-TZP陶瓷晶界的偏聚有关.
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