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Carbon-deficient high-entropy transition metal carbide ceramic material and preparation method thereof
The invention relates to a carbon-deficient high-entropy transition metal carbide ceramic material and a preparation method thereof. The method comprises the following steps of: blending five transition metal oxides with carbon black or graphite, drying, carrying out heat treatment in a vacuum state in a pressureless furnace, and cooling to obtain a single-phase high-entropy carbide; and then blending with a metal simple substance or a mixture of different metal simple substances, drying, and carrying out spark plasma sintering. The method has the advantages of simple process, high controllability, easiness in realizing large-scale production and the like; a large number of carbon vacancies and lattice distortion caused by high entropy exist in the prepared carbon-deficient high-entropy carbide ceramic, so that the thermal conductivity of the material is further reduced.
本发明涉及一种缺碳型高熵过渡金属碳化物陶瓷材料及其制备方法。该方法包括：将五种过渡金属氧化物与炭黑或石墨共混，干燥，以无压炉在真空状态下热处理，冷却，得到单相高熵碳化物；然后与金属单质或不同金属单质的混合物共混，干燥，放电等离子烧结。该方法工艺简单、可操控性强、容易实现规模化等优点；制备得到的缺碳型高熵碳化物陶瓷内部存在大量碳空位和高熵化带来的晶格畸变，有利于进一步降低材料的热导率。
Carbon-deficient high-entropy transition metal carbide ceramic material and preparation method thereof
The invention relates to a carbon-deficient high-entropy transition metal carbide ceramic material and a preparation method thereof. The method comprises the following steps of: blending five transition metal oxides with carbon black or graphite, drying, carrying out heat treatment in a vacuum state in a pressureless furnace, and cooling to obtain a single-phase high-entropy carbide; and then blending with a metal simple substance or a mixture of different metal simple substances, drying, and carrying out spark plasma sintering. The method has the advantages of simple process, high controllability, easiness in realizing large-scale production and the like; a large number of carbon vacancies and lattice distortion caused by high entropy exist in the prepared carbon-deficient high-entropy carbide ceramic, so that the thermal conductivity of the material is further reduced.
本发明涉及一种缺碳型高熵过渡金属碳化物陶瓷材料及其制备方法。该方法包括：将五种过渡金属氧化物与炭黑或石墨共混，干燥，以无压炉在真空状态下热处理，冷却，得到单相高熵碳化物；然后与金属单质或不同金属单质的混合物共混，干燥，放电等离子烧结。该方法工艺简单、可操控性强、容易实现规模化等优点；制备得到的缺碳型高熵碳化物陶瓷内部存在大量碳空位和高熵化带来的晶格畸变，有利于进一步降低材料的热导率。
Carbon-deficient high-entropy transition metal carbide ceramic material and preparation method thereof
一种缺碳型高熵过渡金属碳化物陶瓷材料及其制备方法
LIU JIXUAN (author) / WEI XIAOFENG (author) / ZHANG GUOJUN (author) / LI FEI (author)
2020-08-14
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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