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首页> 外文期刊>Key Engineering Materials >Influence of 3Y-TZP on Microstructure and Mechanical Properties of Al_2O_3-based Composites
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Influence of 3Y-TZP on Microstructure and Mechanical Properties of Al_2O_3-based Composites

机译:3Y-TZP对Al_2O_3基复合材料组织和力学性能的影响

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摘要

Al_2O_3 composites with different volume fractions of 3Y-TZP (3 mol% yttria-doped tetragonal zirconia polycrystalline) were prepared by using a colloidal process and pressure-casting into green specimens, then were pressureless sintered to full density at 1550℃. The resulted two-phase microstructure contained uniformly distributed and submicro- meter-sized grains. The addition of 15 vol% ZrO_2 resulted in an increase in bending strength (average 656 MPa by 4 pt. test). Appreciate amount of m-ZrO_2 phase was detected after fracture. The enhanced transformability results in an increase in flexural strength and toughness. The addition of 30 vol% ZrO_2 resulted in best toughness (5.4 MPam~(0.5)) and outstanding wear resistance (7.2 × 10~(-8) cm~3/Nm).
机译:采用胶体工艺制备了不同体积分数的3Y-TZP(3 mol%氧化钇掺杂的四方氧化锆多晶)Al_2O_3复合材料,并压铸成绿色试样,然后在1550℃无压烧结至全密度。产生的两相组织包含均匀分布的亚微米级晶粒。添加15 vol%的ZrO_2导致抗弯强度增加(4磅测试平均656 MPa)。断裂后检测到适量的m-ZrO_2相。增强的可变形性导致弯曲强度和韧性的增加。加入30%(体积)的ZrO_2可获得最佳的韧性(5.4 MPam〜(0.5))和出色的耐磨性(7.2×10〜(-8)cm〜3 / Nm)。

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