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首页> 外文期刊>Journal of Materials Science >Effect of green density and electric field direction on densification of YAG nano-powders by spark plasma sintering
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Effect of green density and electric field direction on densification of YAG nano-powders by spark plasma sintering

机译：生坯密度和电场方向对火花等离子体烧结YAG纳米粉致密化的影响

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摘要

Nanocrystalline YAG powders with 34-nm average particle size were cold isostatic pressed (CIP) between 10 and 240 MPa to form compacts with 43–52% green densities. Spark plasma sintering (SPS) was performed for 5 min at 1,400 °C and 90 MPa using clusters of three disc specimens packed in series with the electric field direction. The pore size and its volume fraction decreased with the increase in the CIP pressure. The final density varied between 86% and 99% and strongly depended on the specimen location in the series. Density, grain size, and pore size analyses showed that the specimens facing the electric current experienced higher SPS temperatures. Possible temperature gradient due to axial displacement of non-conducting oxide was too low to explain the observed effect. Effect of the green density on the final density was marginal.
机译：将平均粒径为34 nm的纳米YAG粉末冷等静压（CIP）在10至240 MPa之间，以形成生坯密度为43-52％的压坯。火花等离子体烧结（SPS）在1,400°C和90 MPa下使用三个圆盘样品簇按电场方向串联进行了5分钟。孔径和其体积分数随CIP压力的增加而减小。最终密度在86％至99％之间变化，并且强烈取决于系列中的样品位置。密度，晶粒度和孔径分析表明，面对电流的样品经历了更高的SPS温度。由于非导电氧化物的轴向位移而可能产生的温度梯度太低，无法解释所观察到的效果。绿色密度对最终密度的影响很小。

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