Effect of B3Si on the Structure and Properties of B4C Ceramics

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Superhard Materials Pub Date : 2023-07-19 DOI:10.3103/S1063457623030176

P. V. Mazur, O. M. Grigoriev, L. M. Melakh, I. V. Kozak, M. V. Karpets, D. V. Vedel

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Abstract

Dense composite ceramics based on B₄C with an addition of 10 to 50 wt % of B₃Si were obtained by hot pressing. An increased amount of boron silicide decreases the hot pressing temperature to obtain a high-density material. We found a hot pressing temperature, optimal for each of the compositions and possess the highest hardness, which is associated with the formation of a fine-grained structure. Densification occurs during reactive hot pressing, which consists in the decomposition of B₃Si into Si and BSi_n (n = 12–23) and further interaction with B₄C to form SiC and B₁₂(Si,B,C)₃. The modification of boron carbide with silicon leads to the stabilization of hardness at ~24–26 GPa in the load range from 2 to 200 N. The highest bending strength of ~500 MPa is observed for samples with up to 20 wt % of B₃Si. The optimal composition, which combines high values of hardness and flexural strength, is B₄C–20 wt % B₃Si.

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B3Si对B4C陶瓷结构和性能的影响

采用热压法制备了B3Si添加量为10% ~ 50%的B4C基致密复合陶瓷。硅化硼用量的增加降低了热压温度以获得高密度材料。我们发现了一个热压温度，对每种成分都是最佳的，并且具有最高的硬度，这与细颗粒结构的形成有关。致密化发生在反应热压过程中，B3Si分解为Si和BSin (n = 12-23)，并进一步与B4C相互作用形成SiC和B12(Si,B,C)3。在2 ~ 200n的载荷范围内，硅对碳化硼的改性使其硬度稳定在~24 ~ 26gpa，当B3Si含量达到20%时，其抗弯强度可达~ 500mpa。结合高硬度和抗弯强度值的最佳成分是B4C-20 wt % B3Si。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Superhard Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

1.80

自引率

66.70%

发文量

审稿时长

2 months

期刊介绍： Journal of Superhard Materials presents up-to-date results of basic and applied research on production, properties, and applications of superhard materials and related tools. It publishes the results of fundamental research on physicochemical processes of forming and growth of single-crystal, polycrystalline, and dispersed materials, diamond and diamond-like films; developments of methods for spontaneous and controlled synthesis of superhard materials and methods for static, explosive and epitaxial synthesis. The focus of the journal is large single crystals of synthetic diamonds; elite grinding powders and micron powders of synthetic diamonds and cubic boron nitride; polycrystalline and composite superhard materials based on diamond and cubic boron nitride; diamond and carbide tools for highly efficient metal-working, boring, stone-working, coal mining and geological exploration; articles of ceramic; polishing pastes for high-precision optics; precision lathes for diamond turning; technologies of precise machining of metals, glass, and ceramics. The journal covers all fundamental and technological aspects of synthesis, characterization, properties, devices and applications of these materials. The journal welcomes manuscripts from all countries in the English language.