Abstract
The preparation of hydroxyl chromium oxide by hydrogen reduction of disodium chromate and particulate hydroxyl mechanical activation features were studied. Then with self-made hydroxyl chromium as the raw material, a direct reduction and carburization process was used to prepare ultra-fine chromium carbonization. Through SEM and XRD, the high performance mechanical activation, key coefficients, microstructure, hardness and wear-resisting property were investigated. The results reveal that suitable mechanical activation and carbon reducing carbonization temperature, carbonization time, carbon content are beneficial to obtaining ultra-fine chromium carbonization. Typically, when the time of high performance grinding is 5 min, the carbon reducing temperature is 1 100 ℃, the carbon reducing time is 1 h, the carbon content is 28%, and finally the particle size of chromium carbide powder is 1 μm. Under this condition of preparation of ultra-fine chromium carbide, both the hardness and wear resistance are better than those in the industrialization of chromium carbide coating.
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Supported by the National High-tech Research and Development Program of China (863 Program) (No. 2012AA062303), National Natural Science Foundation of China (Nos. 51764016, U1402271, 51504058, 51504059), Jiangxi Science and Technology Landing Project (No. KJLD13046), and the Doctoral Scientific Research Foundation of Jiangxi University of Science and Technology (No. jxxjbs17045)
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Tian, L., Chen, L., Zhang, T. et al. Preparation and properties of ultra-fine chromium carbonization of high performance mechanical activation. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 56–63 (2018). https://doi.org/10.1007/s11595-018-1785-0
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DOI: https://doi.org/10.1007/s11595-018-1785-0