Low Temperature Pyrolysis Activation of Complex Ultra-Fine Diamond and Its Oxidation Resistance and Dispersion Preperities
LI Wensheng1,2, HUANG Xiaolong2, CHENG Bo2, LI Jianjun2, SONG Qiang1, Uladzimir Seniuts3
1 School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China 2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, Lanzhou 730050, China 3 The Joint Institute of Mechanical Engineering, National Academy of Sciences of Belarus, Minsk 220072, Belarus
Abstract: The poor solution dispersion stability and high temperature oxidation resistance limits the usage performance of ultra-fine diamond (UFD). Hereby, a combined process of silicon in-situ pyrolysis, activation, and coating was designed to achieve the surface-coating modification of UFDs, and as a result, UFD/Si composite-powders materials with a core-shell structure with nanometer Si coatings are developed. The morphology, phase, composition, graphitization and the coating thickness of the coated UFD/Si powder was characterized by TEM, XRD and Raman respectively, and the high temperature oxidation resistance and the dispersion stability in the 10% dilute sulfuric acid of UFDs and UFD/Si composite-powders were investigated by thermogravimetric analysis and Fourier transform infrared spectroscopy. The results showed that the reaction of the combined process of silicon in-situ pyrolysis, activation, and coating was sufficiently active at 850 ℃, and the original UFDs were evenly coated by the amorphous silicon layer with a thickness about 10-30 nm in an ellipsoidal shape The core-shell structure coated UFD/Si presented a higher oxidation resistant temperature of 780 ℃ than that (500 ℃) of the original UFDs, and its settling time in 10 % dilute sulfuric acid was also 12h longer than that of the original UFDs, because the coated amorphous silicon layer prevented the contact between UFDs and the environment oxygen, and reduced the functional groups on the UFDs surface and the adsorption adhesion strength between UFDs.
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2023, Vol. 37 
