Effects of carbon on the synthesis and densification of tantalum carbide powder

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-10-25 DOI:10.1016/j.jeurceramsoc.2024.117022

Chun Liu , Yunwu Tang , Chaoyi Ding , Wenhao Li , Weimin Wang

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Abstract

Tantalum carbide (TaC) powder was synthesised at 1500 ºC by sol-gel and carbothermal reduction processes using tantalum pentachloride (TaCl₅) and phenolic resin as the starting materials. The effects of the C/Ta ratios in the Ta-containing precursor on the reaction yield, microstructure, chemical composition, and sinterability of the powders were investigated. The results showed that a high C/Ta ratio was favourable for the formation of TaC powder. With an increase in the C/Ta ratio, the oxygen content of the powder decreased, whereas the free carbon content increased. Consolidated TaC ceramics with high relative density (> 97 %) were obtained at 1900 ºC for 5 min under 80 MPa after sintering the powder synthesised at C/Ta ratios of 4.00 and above. However, the hardness and fracture toughness of the TaC ceramics were slightly reduced when the C/Ta ratio exceeded 4.00, owing to weak interface bonding caused by excessive free carbon in the powder. It was found that sintering TaC powders prepared at a C/Ta ratio of 4.00 produced dense TaC ceramics, with a Vickers hardness and fracture toughness of 16.54 GPa and 3.72 GPa∙m^1/2, respectively.

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碳对碳化钽粉末的合成和致密化的影响

以五氯化钽（TaCl5）和酚醛树脂为起始材料，通过溶胶凝胶和碳热还原工艺在 1500 ºC 下合成了碳化钽（TaC）粉末。研究了含 Ta 前驱体中的 C/Ta 比对粉末的反应产率、微观结构、化学成分和烧结性的影响。结果表明，高 C/Ta 比有利于形成 TaC 粉末。随着 C/Ta 比的增加，粉末中的氧含量降低，而游离碳含量增加。以 4.00 及以上的 C/Ta 比合成的粉末在 80 兆帕下烧结 5 分钟后，在 1900 ºC 的温度下获得了高相对密度（97%）的固结 TaC 陶瓷。然而，当 C/Ta 比率超过 4.00 时，TaC 陶瓷的硬度和断裂韧性略有下降，原因是粉末中游离碳过多导致界面结合力较弱。研究发现，烧结 C/Ta 比为 4.00 时制备的 TaC 粉末可生成致密的 TaC 陶瓷，其维氏硬度和断裂韧性分别为 16.54 GPa 和 3.72 GPa∙m1/2。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.