Synthesis and thermal stability of nanocrystalline chromium disilicide
Synthesis and thermal stability of nanocrystalline chromium disilicide
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纳米晶二硅化铬的合成及热稳定性
DOI：
10.1016/j.jallcom.2003.12.015
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发表时间：
2004
影响因子：
6.2
通讯作者：
Y. Qian
中科院分区：
文献类型：
--
作者：
Jianhua Ma;Yunle Gu;Liang Shi;Luyang Chen;Zeheng Yang;Y. Qian
以无水三氯化铬和氟硅酸钠为原料，在650℃下与金属钾共还原，合成了纳米晶二硅化铬。X-射线粉末衍射图表明产物为六方相的CrSi2。透射电子显微镜图像显示，样品由直径为20-50 nm的颗粒组成，平均直径约为35 nm。TGA和DTA表明，CrSi2在700℃空气中开始氧化，在1000℃以下，只有约8.6wt.%的样品在颗粒表面氧化，由于形成了保护层，具有较高的热氧化稳定性。
Nanocrystalline chromium disilicide was synthesized by co-reducing anhydrous chromium trichloride and sodium fluorosilicate with metallic potassium at 650°C in an autoclave. X-ray powder diffraction pattern indicated that the product was hexagonal CrSi2. Transmission electron microscope images showed that the sample consisted of particles with the diameters of 20–50nm and an average diameter of about 35nm. TGA and DTA indicated that the oxidation of CrSi2began to proceed at 700°C in air, and only about 8.6wt.% of the sample was oxidized in the surfaces of the particles below 1000°C. It had high thermal oxidation stability due to the formed protective layer.