Mechanical properties of low temperature synthesized dense and fine-grained Cr2AlC ceramics
Mechanical properties of low temperature synthesized dense and fine-grained Cr2AlC ceramics
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DOI：
10.1016/j.jeurceramsoc.2010.08.014
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发表时间：
2011
影响因子：
5.7
通讯作者：
S. Li;Wenbo Yu;Hongxiang Zhai;G. Song;W. Sloof;S. Zwaag
中科院分区：
文献类型：
--
作者：
S. Li;Wenbo Yu;Hongxiang Zhai;G. Song;W. Sloof;S. Zwaag
采用机械活化热压工艺在较低温度下合成了细晶Cr2AlC陶瓷。将Cr、Al和C粉末按摩尔比为2：1.2：1的比例混合，经机械合金化3h后，在Ar气氛中，在30MPa和不同温度下热压1h。结果表明，在1100°C的较低温度下可以合成出晶粒尺寸约为2μm的致密Cr2AlC陶瓷。合成的细晶Cr2AlC具有99%的高密度，高于未球磨的Cr、Al和C热压合成的粗晶Cr2AlC（晶粒尺寸约35μm）的95%的密度。测定了细晶Cr2AlC的抗弯强度、断裂韧性和维氏硬度，并与粗晶Cr2AlC的值进行了比较。
Mechanically activated hot-pressing technology was used to synthesize a fine-crystalline Cr2AlC ceramic at relatively low temperatures. A mixture of Cr, Al and C powders with a molar ratio of 2:1.2:1 was mechanically alloyed for 3h, and then subjected to hot pressing at 30MPa and different temperatures for 1h in Ar atmosphere. The results show that a dense Cr2AlC ceramic with a grain size of about 2μm can be synthesized at a relatively low temperature of 1100°C. The synthesized fine-grained Cr2AlC has a high density of 99%, which is higher than the 95% density for the coarse-grained Cr2AlC (grain size of about 35μm) as synthesized by hot pressing unmilled Cr, Al and C. The flexural strength, fracture toughness and Vickers hardness of the fine-grained Cr2AlC were determined and compared with the values for the coarse-grained Cr2AlC.