通过在2Y-TZP中加入一定量的硅酸盐玻璃相添加剂,在较低的烧结温度下,制备出细晶、具有良好综合性能的2Y-TZP材料.研究了添加剂加入后,2Y-TZP材料烧结特性、显微结构及力学性能.发现加入少量的添加剂后,不但可以明显降低材料的烧结温度,而且由于细晶及相变增韧的共同作用,材料仍具有较高的抗折强度和断裂韧性.讨论了稳定剂含量对低温烧结Y-TZP力学性能的影响,发现较低稳定剂含量的2Y-TZP材料,由于临界相变尺寸小,在断裂过程中,有更多的四方相氧化锆转变成单斜相,相变增韧的效果更好,因而具有更高的断裂韧性.
Tetragonal Zirconia Polycrystals (TZP) stabilized with 2mol% Y2O3(2Y-TZP) with superfine grains and
high perfomances were obtained by adding certain glassy additives into 2Y-TZP powders and sintered at lower temperatures. The sintering character,
microstructure and mechanical properties of the materials with various content of additives were investigated. It could not only lower sintering
temperatures, but also improve flexural strength and fracture toughness of the materials by the common effect of cryptomere strengthening and phase
transformation toughening. The influence of stabilizer content on mechanical properties of low temperature sintered Y-TZP was discussed. The results
showed that for 2Y-TZP materials, because of low stabilizer content and small critical transformation size, more tetragonal zirconia could change
into monoclinal, and had better effect of transformation toughening, hence higher fracture toughness was obtained.
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