Abstract: Carbon/calcium aluminate composite powder was synthesized by carbon-bed sintering, taking organic calcium (oxa-late, calcium citrate, calcium stearate) and aluminium oxide as raw materials. The impact of sintering temperature and the species of organic calcium on the phase and microstructure of the obtained composite powder were analyzed by XRD, Raman spectroscopy and SEM. And the properties of the composite powder were characterized by particle size analyzer and thermogravimetric analyzer. The results indicated that C12A7 in the product gradually convert into CA and CA2 as the sintering temperature raised from 1 200 ℃ to 1 400 ℃. Compared to specimen with calcium carbonate as calcium source, the specimen that take organic calcium as calcium source and sinter at 1 400 ℃ present higher CA2 content in the Raman spectra of all the samples, D and G peaks corresponding to free carbon appear at about 1 350 cm-1 and 1 580 cm-1, respectively, which indicate that all the products contain free carbon. As can be seen in the SEM results, the free carbon of the specimen (1400-Cit) sintered at 1 400 ℃ with the calcium citrate as calcium and carbon sources is dispersively distributed in calcium aluminate and wrapped by it, forming a nearly spherical composite. The 1400-Cit contains the highest carbon content of 5.98wt% which is obtained by oxidation weightlessness method.
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2018, Vol. 32 
