Effects of different carbon sources on the phase composition and microstructure of synthesized SiC-B4C composite powders

Yu Cao; Ruyi Deng; Jilin Hu; Jinxiu He; Dapeng Lei; Zhanjun Chen; Yangxi Peng

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자료유형: 학술저널

저자정보: Yu Cao (Hunan University of Humanities) Ruyi Deng (Hunan University of Humanities) Jilin Hu (Hunan University of Humanities) Jinxiu He (Hunan University of Humanities) Dapeng Lei (Hunan University of Humanities) Zhanjun Chen (Hunan University of Humanities) Yangxi Peng (Hunan University of Humanities)

저널정보: 한양대학교 세라믹공정연구센터 Journal of Ceramic Processing Research Journal of Ceramic Processing Research 제24권 제2호

발행연도: 2023.4

수록면: 321 - 328 (8page)

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SiC-B4C composite powders were synthesized by the carbothermal reduction method under an argon atmosphere usingdifferent kinds of carbon sources (carbon black and starch) and silica sol and boric acid as the precursor raw materials. Basedon thermodynamic analysis and calculation, the effects of different carbon sources and reaction temperatures on the mass lossrate, phase composition, and microstructure of SiC-B4C ultrafine composite powders were comparatively studied. Resultsshowed that the optimum conditions for synthesizing SiC-B4C composite powders with carbon black as the carbon source were1550 ºC for 2 h, whereas the optimum conditions for synthesizing SiC-B4C composite powders with starch as the carbon sourcewere 1450 ºC-1550 ºC for 2 h. The powder samples synthesized with carbon black as the carbon source at 1550 ºC were mainlycomposed of flaky, columnar-like, spherical, and irregular polyhedral particles (about 100-200 nm in diameter). Mutualcohesion or agglomeration between particles was minimal. In the powder samples synthesized at 1550 ºC with an excess of 10wt% starch, in addition to a certain amount of flaky, spherical, and other irregular structure particles, a certain amount ofuniform, slender whiskers (about 50-100 nm in diameter) and a certain phenomenon of lap and winding between the whiskerswere noted. The powder samples synthesized at 1550 ºC with an excess of 20 wt% starch had no whisker-like substance.

#carbon black #starch #SiC-B4C #composite powders #synthesis.

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