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首页> 外文期刊>Journal of the Korean Ceramic Society >MgAl2O4-reinforced c-ZrO2 ceramics prepared by spark plasma sintering
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MgAl2O4-reinforced c-ZrO2 ceramics prepared by spark plasma sintering

机译：MgAl2O4-reinforced c-ZrO2陶瓷准备的火花等离子烧结

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摘要

c-zirconia ceramic composites have been synthesized by spark plasma sintering (SPS) technique from commercial m-ZrO2, Y2O3 and waste-derived magnesium aluminate spinel (MA) powders. In this study, effect of MA addition on stabilization and reinforcement of 5 mol% yttria-stabilized zirconia (YSZ) was carefully investigated. Spark plasma sintering of designed powder mixtures at 1400 degrees C for 30 min and 40 MPa produce fully dense compacts with an average grain size of 0.5-10 mu m. The pressure was gradually increased up to 40 MPa using argon gas and was kept until the end of the sintering process. The refined microstructure (0.5-10 mu m) obtained in this study has achieved superior compaction resistance values that are ten times more than strength values of conventionally sintered specimens. Such improvement in compaction resistance of the sintered specimens was attributed to particle size refinement and grain boundary enhancement. What's more, spark-plasma sintered composites containing 10-50 wt% MA revealed higher resistance to low temperature degradation (LTD) than the reference composite that doesn't contain MA spinel; where about similar to 2.8% of t-ZrO2 was converted into m-ZrO2 in case of the latter composite while aging test didn't influence at all on the structure of the former composites. The outcomes indicated that MA has a significant effect on m-ZrO2 stabilization into a cubic phase structure that concurrently owned an enhanced and comparable compression resistance to Yttrium-doped t-ZrO2 (Y-TZP). In this respect, the ternary oxide ceramic composite systems prepared in this study present huge potential for development c-ZrO2-based industrial ceramics with a wide spectrum of mechanical characteristics for high-tech engineering applications of harsh-stress and humid environments.
机译：c-zirconia陶瓷复合材料合成了火花等离子烧结(SPS)技术与商业m-ZrO2, Y2O3和废弃物是铝酸镁尖晶石(MA)粉末。稳定和强化5摩尔%仔细yttria-stabilized氧化锆(YSZ)调查。粉混合物在1400度30分钟40 MPa产生与一个完全致密的契约平均晶粒尺寸为0.5 -10μm。压力逐渐增加到40 MPa使用氩气体和烧结的一直到最后的过程。这一研究获得的取得了优势压缩阻力值的十倍比传统的强度值烧结标本。压实电阻烧结的标本由于粒度细化和吗晶界的提高。spark-plasma烧结复合材料含有10 - 50马wt %显示高阻力低比参考温度下降(有限公司)马不含尖晶石复合;类似于2.8%的t-ZrO2转换为m-ZrO2在后者的情况下组合老化试验没有影响的前复合材料的结构。马表示,有显著的影响m-ZrO2稳定到一个立方相结构同时拥有一个增强类似压缩阻力Yttrium-doped t-ZrO2 (Y-TZP)。三元氧化物陶瓷复合系统准备在这个研究的巨大潜力发展c-ZrO2-based工业陶瓷广泛的机械特性高科技工程的应用harsh-stress和潮湿环境。

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