期刊
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
卷 22, 期 3, 页码 319-324出版社
SPRINGER
DOI: 10.1007/s12613-015-1076-0
关键词
chromium powder; nitridation; chromium nitride; ammonia; chemical synthesis; reaction mechanism
类别
资金
- Innovation Foundation of Shanghai University [sdcx2012033, sdcx2012062]
- Special Research Foundation for Training and Selecting Outstanding Young Teachers of Universities in Shanghai [B.37-0407-12-008]
- National Natural Science Foundation of China [51072112, 51272154]
- Projects of International Cooperation and Exchanges NSFC [51311130110]
CrN powder was synthesized by nitriding Cr metal in ammonia gas flow, and its chemical reaction mechanism and nitridation process were studied. Through thermodynamic calculations, the Cr-N-O predominance diagrams were constructed for different temperatures. Chromium nitride formed at 7002-1200A degrees C under relatively higher nitrogen and lower oxygen partial pressures. Phases in the products were then investigated using X-ray diffraction (XRD), and the Cr2N content varied with reaction temperature and holding time. The results indicate that the Cr metal powder nitridation process can be explained by a diffusion model. Further, Cr2N formed as an intermediate product because of an incomplete reaction, which was observed by high-resolution transmission electron microscopy (HRTEM). After nitriding at 1000A degrees C for 20 h, CrN powder with an average grain size of 63 nm was obtained, and the obtained sample was analyzed by using a scanning electron microscope (SEM).
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