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放电等离子烧结和热压制备的碳化锆：致密化动力学、晶粒生长及热性能

Zirconium Carbide Produced by Spark Plasma Sintering and Hot Pressing: Densification Kinetics, Grain Growth, and Thermal Properties.

作者信息

Wei Xialu, Back Christina, Izhvanov Oleg, Haines Christopher D, Olevsky Eugene A

机构信息

Department of Mechanical Engineering, San Diego State University, 5500 Campanile Dr., San Diego, CA 92182, USA.

General Atomics, 3350 General Atomics Ct., San Diego, CA 92121, USA.

出版信息

Materials (Basel). 2016 Jul 14;9(7):577. doi: 10.3390/ma9070577.

DOI:10.3390/ma9070577
PMID:28773697
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5456903/
Abstract

Spark plasma sintering (SPS) has been employed to consolidate a micron-sized zirconium carbide (ZrC) powder. ZrC pellets with a variety of relative densities are obtained under different processing parameters. The densification kinetics of ZrC powders subjected to conventional hot pressing and SPS are comparatively studied by applying similar heating and loading profiles. Due to the lack of electric current assistance, the conventional hot pressing appears to impose lower strain rate sensitivity and higher activation energy values than those which correspond to the SPS processing. A finite element simulation is used to analyze the temperature evolution within the volume of ZrC specimens subjected to SPS. The control mechanism for grain growth during the final SPS stage is studied via a recently modified model, in which the grain growth rate dependence on porosity is incorporated. The constant pressure specific heat and thermal conductivity of the SPS-processed ZrC are determined to be higher than those reported for the hot-pressed ZrC and the benefits of applying SPS are indicated accordingly.

摘要

放电等离子烧结（SPS）已被用于固结微米级碳化锆（ZrC）粉末。在不同的加工参数下获得了具有各种相对密度的ZrC颗粒。通过应用相似的加热和加载曲线，对常规热压和SPS处理的ZrC粉末的致密化动力学进行了比较研究。由于缺乏电流辅助，常规热压似乎比SPS处理具有更低的应变速率敏感性和更高的活化能值。采用有限元模拟分析了SPS处理的ZrC试样体积内的温度演变。通过最近改进的模型研究了SPS最后阶段的晶粒生长控制机制，该模型考虑了晶粒生长速率对孔隙率的依赖性。确定SPS处理的ZrC的恒压比热容和热导率高于热压ZrC报道的值，并据此指出了应用SPS的好处。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3e7/5456903/af576a5956e5/materials-09-00577-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3e7/5456903/977eadb82d80/materials-09-00577-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3e7/5456903/af576a5956e5/materials-09-00577-g011.jpg

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本文引用的文献

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1000 at 1000: The effect of electric field and pressure on the synthesis and consolidation of materials: a review of the spark plasma sintering method.1000 时的 1000：电场和压力对材料合成与固结的影响：放电等离子烧结法综述
J Mater Sci. 2020;55(32):15365-15366. doi: 10.1007/s10853-020-05040-4. Epub 2020 Jul 10.
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