无机材料学报

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硼酸碳热还原-渗硅反应制备碳化硼复合材料的研究

郑雅雯, 张翠萍, 张瑞杰, 夏乾, 茹红强   

  1. 东北大学 材料科学与工程学院, 材料各向异性与织构教育部重点实验室, 沈阳 110819
  • 收稿日期:2023-12-21 修回日期:2024-03-17 出版日期:2024-03-22 网络出版日期:2024-03-22
  • 作者简介:郑雅雯(2000-),女,硕士研究生. E-mail:zheng_ya_wen@163.com.
  • 基金资助:
    辽宁省教育厅基本科研面上项目(LJKMZ20220340); 公安部科技计划(2022ZB03)

Fabrication of Boron Carbide Ceramic Composites by Boronic Acid Carbothermal Reduction and Silicon Infiltration

ZHENG Yawen, ZHANG Cuiping, ZHANG Ruijie, XIA Qian, RU Hongqiang   

  1. Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
  • Received:2023-12-21 Revised:2024-03-17 Published:2024-03-22 Online:2024-03-22
  • About author:ZHENG Yawen(2000-), female, Master candidate. E-mail:zheng_ya_wen@163.com

摘要: 碳化硼性能优良,应用广泛,但制备成本较高。为了从源头解决碳化硼陶瓷材料制备成本高的问题,本工作直接以碳热还原法合成的碳化硼-C复合粉体为原料,无需进行破碎提纯,通过渗Si反应烧结制备碳化硼复合材料,所得材料性能与以市售碳化硼粉体为原料制备的材料性能相当,有效降低了其制备成本。主要研究了原料碳硼摩尔比对合成粉体以及碳化硼复合材料物相、显微组织和性能的影响,并探讨了碳化硼陶瓷复合材料的强韧化机理。结果表明:随碳硼摩尔比的增加,所合成粉体中碳化硼粉体碳硼比增加,且合成粉体中游离C含量增加,当碳硼摩尔比为2.01时,游离C包覆在碳化硼粉体颗粒表面。复合材料相组成均为B12(C,Si,B)3、SiC和Si,随碳硼摩尔比的增加,复合材料中碳化硼和游离Si含量降低,SiC含量、SiC区域尺寸、大尺寸SiC区域和纳米SiC颗粒的数量均增加。大尺寸SiC区域的产生会降低材料强度和韧性,而SiC纳米颗粒的形成又有利于提高强度和韧性。当碳硼摩尔比为1.35时,复合材料的抗弯强度和断裂韧性最高,分别为338 MPa和4.06 MPa∙m1/2

关键词: 碳化硼, 碳热还原法, 渗Si反应烧结, 碳硼摩尔比, 显微组织

Abstract: Boron carbide possesses excellent properties and has a wide range of applications, but its production cost is relatively high. To address the issue of high preparation cost of boron carbide ceramic materials from the source, we directly used boron carbide-C composite powder synthesized by carbothermal reduction method as the raw material, without crushing and purification. Boron carbide composites were prepared through Si infiltration reaction sintering, yielding material properties comparable to those prepared from commercially available boron carbide powder, effectively reducing its preparation cost. We mainly studied the influence of the molar ratio of carbon to boron on the synthesis of powder and the phase composition, microstructure and properties of boron carbide ceramic composites materials, and explored the toughening mechanism of boron carbide ceramic composites. With the increase of the molar ratio of carbon to boron, the carbon to boron ratio in the synthesized boron carbide powder increases, as well as the content of free C, which coats the surface of the boron carbide particles at the molar ratio of 2.01. The phase composition of the boron carbide composite materials is B12(C,Si,B)3, SiC and Si. With the increase of carbon-boron molar ratio, the content of boron carbide and free Si in the composite decreases, while the content of SiC, the size of SiC region, the number of large SiC regions and SiC nanoparticles increase. The formation of large SiC regions decreases the strength and toughness of the material, while the creation of SiC nanoparticles contributes to the improvement of strength and toughness. When the carbon to boron molar ratio is 1.35, the composite exhibits the highest flexural strength and fracture toughness, reaching 338 MPa and 4.06 MPa∙m1/2, respectively.

Key words: boron carbide, carbothermal reduction method, Si infiltration reaction sintering, carbon boron molar ratio, microstructure

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