硅低温热解活化包覆超细金刚石及其抗氧化和分散稳定性

doi:10.11896/cldb.21120094

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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.

Key words： Si in-situ thermolysis core-shell structure ultra-fine diamond high-temperature resistance dispersion stability

Published: 10 June 2023 Online: 2023-06-19

CLC number:

TB32

Fund:National Key R & D Program of China (2022YFE010462), the National Natural Science Foundation of China (51901093, 52075234,51674130), the Project of Industrial Support Plan for Colleges and Universities in Gansu Province(2020C-11), Hongliu Distinguished Young Talent Support Program of Lanzhou University of Technology, Major Special Projects of Gansu Province (21ZD4WA017), and the Program of “Science and Technology International Cooperation Demonstrative Base of Metal Surface Engineering Along the Silk Road”(2017D01003).

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	Articles by authors
	LI Wensheng
	HUANG Xiaolong
	CHENG Bo
	LI Jianjun
	SONG Qiang
	Uladzimir Seniuts

Cite this article:

LI Wensheng,HUANG Xiaolong,CHENG Bo, et al. Low Temperature Pyrolysis Activation of Complex Ultra-Fine Diamond and Its Oxidation Resistance and Dispersion Preperities[J]. Materials Reports, 2023, 37(11): 21120094-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21120094 OR http://www.mater-rep.com/EN/Y2023/V37/I11/21120094

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