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烧结温度变化的影响Mo2TiAlC2陶的多孔结构

Junsheng Yang¹, Yiquan Fan¹, Hua Tan^2,3

¹College of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430048, China.

Materials (Basel, Switzerland)

|August 26, 2023

概括

这项研究使用激活反应烧结制造了多孔的碳化 (Mo₂TiAlC₂) . 在1500°C达到最佳孔隙结构和高孔隙度,详细介绍了孔隙形成机制.

科学领域:

材料科学材料科学材料科学
陶工程陶工程陶工程
粉末金工艺在粉末金工艺

背景情况:

像碳化 (Mo₂TiAlC₂) 这样的先进陶对于高性能应用至关重要.
控制孔隙性是定制陶性能以适应特定用途的关键.

研究的目的:

通过激活反应烧结来研究多孔Mo₂TiAlC₂的合成.
描述烧结温度对相位构成,体积膨胀和孔隙性的影响.
在烧结过程中阐明孔隙形成机制.

主要方法:

使用元素粉末 (Mo,TiH,Al,石墨) 进行激活反应烧结.
使用X射线衍射 (XRD),扫描电子显微镜 (SEM) 和毛孔大小测试进行表征.
烧结温度从700°C到1500°C的系统变化.

主要成果:

多孔Mo₂TiAlC₂表现出显著的体积膨胀和结构变化随着温度的增加.
孔隙性和体积膨胀率增加到1300°C,然后在更高的温度下降.
在1500°C时,可获得多孔的Mo₂TiAlC₂,体积膨胀35.74%,多孔度为47.1%,具有均的孔隙结构.

结论:

烧结温度对多孔Mo₂TiAlC₂的微观结构和特性产生了重大影响.
孔隙形成归因于包括初始孔隙演变,粘合物去除,TiH₂分解和Kirkendall效应在内的因素.
该研究成功地在1500°C下合成了多孔性Mo₂TiAlC₂,具有受控的多孔性和均结构.

关键词:

在Mo2TiAlC2中.孔隙形成机制的形成机制多孔性多孔性大量的扩张率的增长率.

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