INFLUENCE OF TEMPERATURE-GRADIENTS ON SINTERING - EXPERIMENTAL TESTS OF A THEORY
INFLUENCE OF TEMPERATURE-GRADIENTS ON SINTERING - EXPERIMENTAL TESTS OF A THEORY
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DOI：
10.1111/j.1151-2916.1989.tb06106.x
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发表时间：
1989-02-01
影响因子：
3.9
通讯作者：
SEARCY, AW
中科院分区：
文献类型：
--
作者：
BERUTO, D;BOTTER, R;SEARCY, AW
将 MgO 在 1303 至 1233 K 温度梯度下的 H2O 催化烧结与等温样品的烧结进行了比较。垂直于温度梯度的平面中样品尺寸的变化以及固定烧结时间的密度增加都大于假设温度梯度中的致密化仅是梯度中的每个局部温度的函数的预测。在所使用的条件下，蒸气传输和液相传输都不重要。因此，结果支持了最近的预测，即温度梯度不仅通过蒸汽传输（如早期研究所预期的那样），而且还通过表面、晶界或体扩散路径来补充驱动烧结和相关过程的表面能变化。
The H2O‐catalyzed sintering of MgO in temperature gradients between 1303 and 1233 K is compared to sintering of isothermal samples. Both the changes in sample dimensions in planes normal to the temperature gradients and the increases in density for a fixed sintering time are greater than predicted on the assumption that densification in a temperature gradient is a function only of each local temperature in the gradient. Under the conditions used, neither vapor transport nor transport through a liquid phase is important. The results, therefore, support a recent prediction that temperature gradients supplement surface energy changes in driving sintering and related processes not only by vapor transport, as expected from earlier studies, but also by a surface, grainboundary, or bulk diffusion path.