化工新型材料

化工新型材料 ›› 2024, Vol. 52 ›› Issue (4) : 107-110. DOI: 10.19817/j.cnki.issn1006-3536.2024.04.048

新材料与新技术

ZrB₂超细粉末的碳热还原法合成及其烧结性能研究

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Synthesis of ZrB₂ ultrafine powder by carbothermal reduction and its sintering properties

Cao Yu, Hu Jilin, Chen Zhanjun, Tian Xiuying, Wen Jin, Peng Yangxi

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Received		Published
2022-08-15		2024-04-20
Issue Date	Revised Date
2024-05-07	2022-08-15

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摘要

以碳化硼、炭黑和氧化锆粉末为原料,在氩气气氛条件下采用碳热还原法合成ZrB₂超细粉末。研究了反应温度对合成ZrB₂粉末的烧失率、物相组成和显微形貌的影响,同时对合成机理进行初步探讨。在此基础上,以Al₂O₃、Y₂O₃、AlN等添加剂作为烧结助剂,对合成的ZrB₂粉末进行烧结性能研究。结果表明,在反应温度为1500～1600℃合成条件下,采用碳热还原法在氩气气氛中成功合成了ZrB₂超细粉末。在本实验条件下合成ZrB₂粉末的最适条件为1550℃保温1.5h。在1500℃以上所合成的ZrB₂粉末样品的显微形貌主要由一定量的片状颗粒和近似球状颗粒组成。在1600℃下保温120min所得ZrB₂陶瓷烧结体的表面与断口显微结构均比较致密,说明在本实验条件下合成的ZrB₂超细粉末具有较好的烧结活性和烧结性能。

Abstract

ZrB₂ ultrafine powder was synthesized by carbothermal reduction method under argon atmosphere using boron carbide,carbon black and zirconia powder as raw materials.The effect of reaction temperature on the ignition loss rate,phase composition and microstructure of synthesized ZrB₂ powders was studied,and the synthesis mechanism was discussed.On this basis,the sintering properties of the synthesized ZrB₂ powders were studied using additives such as Al₂O₃,Y₂O₃,AlN as sintering aids.The results showed that ZrB₂ ultrafine powder was successfully synthesized by carbothermal reduction method in argon atmosphere at the reaction temperature of 1500～1600℃.Under the experimental conditions,the optimum condition for synthesizing ZrB₂ powder was 1550℃ with a holding time of 1.5h.The microscopic morphology of ZrB₂ powder samples synthesized above 1500℃ was mainly composed of a certain amount of flake particles and approximately spherical particles.The surface and fracture microstructure of ZrB₂ ceramics sintered at 1600℃ for 120min were relatively dense,indicating that the ZrB₂ ultrafine powder synthesized under the experimental conditions had good sintering activity and sintering performance.

关键词

二硼化锆 / 粉末 / 合成 / 反应温度 / 烧结性能

Key words

ZrB₂ / powder / synthesis / reaction temperature / sintering properties

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ZrB₂超细粉末的碳热还原法合成及其烧结性能研究[J]. 化工新型材料, 2024, 52(4): 107-110 DOI:10.19817/j.cnki.issn1006-3536.2024.04.048

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