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碳熱還原結(jié)合熔鹽法制備碳化鈦粉末與表征
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武漢科技大學(xué)省部共建耐火材料與冶金國家重點實驗室,武漢科技大學(xué)省部共建耐火材料與冶金國家重點實驗室,武漢科技大學(xué)省部共建耐火材料與冶金國家重點實驗室,武漢科技大學(xué)省部共建耐火材料與冶金國家重點實驗室,武漢科技大學(xué)省部共建耐火材料與冶金國家重點實驗室

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Synthesis of stoichiometric titanium carbide by a combination of carbothermal reduction and the molten salt method and its characterization
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The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology,,,,

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    摘要:

    以NaCl為熔鹽介質(zhì),采用銳鈦礦型鈦白粉和炭黑為原料,探索一種碳熱還原結(jié)合熔鹽法合成高純碳化鈦(TiC)的方法。借助XRD研究了反應(yīng)溫度和原料配比對合成碳化鈦的影響,采用SEM、TEM、EDS,粒度分析儀,熱力學(xué)分析等檢測分析手段對合成產(chǎn)物的特性和過程進行分析。結(jié)果表明:相比傳統(tǒng)的碳熱還原合成碳化鈦的方法,NaCl熔鹽介質(zhì)的引入可以有效的降低碳化鈦的合成溫度(從1700℃到1550℃)以及合成高純碳化鈦的時間(從10h到3h)。結(jié)合研究成果,提出了熔鹽介質(zhì)中溶解-沉淀的合成機理。

    Abstract:

    This paper presents a novel method of preparing stoichiometric titanium carbide (TiC) powders by combining carbothermal reduction and molten salt synthesis (MSS) from raw starting materials of titanium oxide (anatase), C (carbon black), and sodium chloride. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), laser particle size analysis, energy spectrum analysis (EDS), and thermodynamic analysis were used to characterize the powders. The effects of heating temperatures and molar ratios of titania to carbon black on the preparation of TiC are discussed. Results showed that the use of MSS to reduce the synthesis temperatures of both stoichiometric and pure TiC from 1700°C to 1550°C and the time required for synthesis decreased from 10 h for conventional carbothermal reduction of TiO2 to 3 h. A dissolution-precipitation mechanism of synthesis of TiC by MSS was established based on these observed results.

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宋云飛,祝洪喜,鄧承繼,員文杰,丁軍.碳熱還原結(jié)合熔鹽法制備碳化鈦粉末與表征[J].稀有金屬材料與工程,2018,47(4):1082~1088.[SongYunfei, Zhu Hongxi, Deng Chengji, Yuan Wenjie, Ding Jun. Synthesis of stoichiometric titanium carbide by a combination of carbothermal reduction and the molten salt method and its characterization[J]. Rare Metal Materials and Engineering,2018,47(4):1082~1088.]
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  • 收稿日期:2016-05-09
  • 最后修改日期:2016-08-15
  • 錄用日期:2016-10-18
  • 在線發(fā)布日期: 2018-05-31
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