Spark plasma sintering of mullite: Relation between microstructure, properties and spark plasma sintering (SPS) parameters
Spark plasma sintering of mullite: Relation between microstructure, properties and spark plasma sintering (SPS) parameters
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DOI：
10.1016/j.ceramint.2015.01.078
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发表时间：
2015-06
影响因子：
5.2
通讯作者：
D. Ghahremani;T. Ebadzadeh;A. Maghsodipour
中科院分区：
文献类型：
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作者：
D. Ghahremani;T. Ebadzadeh;A. Maghsodipour
研究了放电等离子烧结（SPS）莫来石（D50=3.29 μm）粉末的工艺。改变SPS参数，如保压温度、施加的外部压力和保压时间。莫来石的烧结性随保温温度、保温时间和外加压力的增加而增加。研究了气孔率对SPS法制备的莫来石力学性能（硬度、断裂韧性）的影响。脉冲直流电流被发现在莫来石的致密化和实现接近理论密度发挥主导作用。测得近全致密莫来石的硬度为1256 HV，断裂韧性为2.8MPa·m ~（1/2）。
The spark plasma sintering (SPS) of mullite powder (D50=3.29 μm) was investigated. The SPS parameters such as the dwell temperature, applied external pressure, and dwell time were varied. The sinterability of mullite increases with increase in the dwell temperature, dwell time and applied external pressure. The influence of porosity on mechanical properties (hardness, and fracture toughness) of mullite prepared by SPS is measured. Pulsed DC current is found to play a dominant role in the densification of mullite and achieving near theoretical density. Hardness, and fracture toughness of near fully dense mullite are measured as 1256 HV, and 2.8 MPa m1/2respectively.