Consolidation of ceramic nanopowders
Consolidation of ceramic nanopowders
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DOI：
10.1179/174367608x318844
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发表时间：
2008-05
影响因子：
2.2
通讯作者：
A. Ragulya
中科院分区：
文献类型：
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作者：
A. Ragulya
本文综述了纳米结构陶瓷的固结问题。近年来的实验室实践显示了几种潜在的重要技术用于陶瓷纳米粉末的固结，例如放电等离子烧结、高压烧结和速率控制烧结。发现在这些过程中的晶粒生长因子小于10。这些先进技术必须适应纳米粉末的固结，并需要专门设计用于固结目的的纳米粉末。当适用于纳米粉末时，这些技术必须在快速模式下完成，以消除残余孔隙并保留纳米尺寸的颗粒。然而，实际验证暴露出诸如大的残余孔隙率、三通中的稳定孔隙、缺陷晶界和强烈晶粒生长等问题。当烧结的温度-压力-时间表相对于最小晶粒生长进行优化时，所有这些问题都可以避免。
This review is dedicated to the problems of nanostructured ceramics consolidation. Laboratory practice in recent years has displayed several potentially important technologies for consolidation of ceramic nanopowders, such as spark plasma sintering, high pressure sintering and rate controlled sintering. The grain growth factor in these processes was found to be less than 10. These advanced technologies have to be adapted to consolidation of nanopowders and require nanopowders specifically designed for consolidation purposes. When adapted to nanopowders, these techniques must be accomplished in rapid rate mode to eliminate residual porosity and retain nanosize grains. Practical verification, however, has exposed problems such as large residual porosity, stable pores in triple junctions, defective grain boundaries and intensive grain growth. All these problems can be avoided when the temperature–pressure–time schedule of sintering is optimised with respect to minimal grain growth.