Spark plasma sintering as advanced PM sintering method
Spark plasma sintering as advanced PM sintering method
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DOI：
10.1179/003258902225007041
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发表时间：
2002-12-01
影响因子：
1.4
通讯作者：
Mamedov, V
中科院分区：
文献类型：
--
作者：
Mamedov, V
本文对放电等离子烧结(SPS)的研究工作作了简要综述。SPS是一种新发展起来的快速烧结技术，具有在短时间内实现快速致密化和最小晶粒长大的巨大潜力。实验数据表明，SPS处理后粉末烧结性的提高主要与脉冲电流引起的颗粒表面活化和接触区扩散速率增加有关。应用快速加热可以绕过以表面传输控制烧结为主的低温区。这可以将粉末表面积保持在散装运输非常重要的温度水平。然而，激活效应的性质，特别是关于其加速扩散过程的性质，还没有明确的确定。大量的研究工作报道了脉冲电流作用过程中等离子体的产生。然而，SPS过程中热等离子体的出现是一个有争议的问题，等离子体-粒子相互作用是一个复杂的现象。目前，SPS加工的工业应用主要考虑在难以或极难获得高性能材料的领域，以及通常采用HP或HIP工艺的领域。显然，在这一领域需要做更多的工作，以便更好地了解整个过程，并为更广泛的工业应用卫生和植物检疫措施奠定坚实的基础。
A short overview of works on spark plasma sintering (SPS) is given in the present paper. SPS is a newly developed rapid sintering technique with a great potential for achieving fast densification results with minimal grain growth in a short sintering time. It is proven by obtained experimental data that enhanced sinterability of powders subjected to SPS mainly associated with particle surface activation and increased diffusion rates on the contact zones caused by applied pulse current. Application of rapid heating results in bypassing of low temperature regions where surface transport controlled sintering is dominant. This preserves the powder surface area to temperature levels where bulk transport is significant. However, the nature of activation effects, especially in its regards to acceleration of diffusion processes, is not clearly established. A lot of research work reports about the occurrence of plasma during the application of pulse current. However, the appearance of thermal plasma during SPS is a controversial issue and plasma-particle interaction is a complex phenomenon. Presently the industrial application of SPS processing is considered mainly in the areas where it is difficult or extremely difficult to obtain high performance materials and where normally HP or hipping processes are applied. Apparently significantly more work is required in this field for better understanding of the entire process and for making a stable ground for more extended industrial application of SPS.