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首页> 外文期刊>Journal of Materials Science >Y2O3 and Nd2O3 co-stabilized ZrO2-WC composites
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Y2O3 and Nd2O3 co-stabilized ZrO2-WC composites

机译：Y2O3和Nd2O3共稳定的ZrO2-WC复合材料

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摘要

Y2O3 + Nd2O3 co-stabilized ZrO2-based composites with 40 vol% WC were fully densified by pulsed electric current sintering (PECS) at 1350 degrees C and 1450 degrees C. The influence of the PECS temperature and Nd2O3 co-stabilizer content on the densification, hardness, fracture toughness and bending strength of the composites was investigated. The best combination of properties was obtained for a 1 mol% Y2O3 and 0.75 mol% Nd2O3 co-stabilized composite densified for 2 min at 1450 degrees C under a pressure of 62 MPa, resulting in a hardness of 15.5 +/- 0.2 GPa, an excellent toughness of 9.6 +/- 0.4 MPa.m(0.5) and an impressive 3-point bending strength of 2.04 +/- 0.08 GPa. The hydrothermal stability of the 1 mol% Y2O3 + 1 mol% Nd2O3 co-stabilized ZrO2-WC (60/40) composites was compared with that of the equivalent 2 mol% Y2O3 stabilized ceramic. The double stabilized composite did not degrade in 1.5 MPa steam at 200 degrees C after 4000 min, whereas the yttria stabilized composite degraded after less than 2000 min. Moreover, the (1Y,1Nd) ZrO2-WC composites have a substantially higher toughness (similar to 9 MPa.m(0.5)) than their 2Y stabilized equivalents (similar to 7 MPa.m(0.5)).
机译：Y2O3 + Nd2O3共稳定的ZrO2基复合材料（WC含量为40％）在1350摄氏度和1450摄氏度下通过脉冲电流烧结（PECS）进行了完全致密化。研究了复合材料的硬度，断裂韧性和弯曲强度。对于最佳的性能组合，是在1450℃，62 MPa压力下将1 mol％的Y2O3和0.75 mol％的Nd2O3共稳定的复合材料压实2分钟，结果硬度为15.5 +/- 0.2 GPa，出色的9.6 +/- 0.4 MPa.m（0.5）韧性和令人印象深刻的2.04 +/- 0.08 GPa的三点弯曲强度。比较了1 mol％Y2O3 + 1 mol％Nd2O3共稳定的ZrO2-WC（60/40）复合材料的水热稳定性与等效的2 mol％Y2O3稳定的陶瓷的水热稳定性。 4000分钟后，双稳定复合材料在200摄氏度的1.5 MPa蒸汽中未降解，而氧化钇稳定复合材料在不到2000分钟后降解。此外，（1Y，1Nd）ZrO2-WC复合材料的韧性（近似于9 MPa.m（0.5））比其2Y稳定当量（近似于7 MPa.m（0.5））高得多。

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