The Effect of Preparing Condition and Al Increase on the Bending Strength and Wearing Property of Mo(Si, Al)2-cBN Superhard Composite

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

Journal of Superhard Materials Pub Date : 2025-09-04 DOI:10.3103/S1063457625040112

Zhang Xiaoli, Wei li, Wang Yanbin, Liu Jiahui, Wang Zhuo, Ye Tengfei, Zheng Jiaqi, Zhang Yikang, Chen Zhangjing, Jiang Zongheng

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Abstract

In this paper, Mo(Si, Al)₂-cBN superhard composite was designed and prepared successfully in lower-temperature infiltrating melt aluminum at 975°C for 20 min to overcome shortcomings in low decompose temperature and oxidation resistance, high preparing temperature of present cBN/MAX composite. XRD showed that the main phase of Mo(Si, Al)₂-cBN superhard composite were in-situ formed Mo (Si, Al)₂ and remained cBN, and the vacuum atmosphere was more advantageous for it in gaining high density and llinear shrinkage, and the relationship between molding pressure and shrinkage of this composite obeyed a parabolic form in vacuum atmosphere. The increasement of infiltrated Al was helpful to its bending strength, when Al increased to same level as reported in c-BN/Al superhard materials as 2.86 at % or 9.8 vol %, the bending strength of Mo (Si, Al)₂-cBN superhard composite reached the highest. And also, Mo(Si, Al)₂-cBN ceramic-based superhard material owned excellent wearing property which was evaluated by friction and wear experiment between W₁₈Cr₄V counter-grinding ring and prepared (Mo(Si, Al)₂-cBN ceramics block in dry friction model with a load of 49N.

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制备条件和Al添加量对Mo(Si, Al)2-cBN超硬复合材料抗弯强度和耐磨性的影响

本文设计并成功制备了Mo(Si, Al)2-cBN超硬复合材料，在975℃低温渗透铝熔体中保温20 min，克服了现有cBN/MAX复合材料分解温度低、抗氧化性强、制备温度高的缺点。XRD结果表明，Mo(Si, Al)2-cBN超硬复合材料的主要相为原位形成的Mo(Si, Al)2和剩余的cBN，真空气氛更有利于其获得高密度和线性收缩率，真空气氛下成型压力与收缩率的关系服从抛物线形式。Al含量的增加有利于其抗弯强度的提高，当Al含量增加到c-BN/Al超硬材料的2.86 %或9.8%时，Mo (Si, Al)2-cBN超硬复合材料的抗弯强度达到最高。W18Cr4V反磨环与制备的(Mo(Si, Al)2-cBN陶瓷块在载荷为49N的干摩擦模型下的摩擦磨损实验表明，Mo(Si, Al)2-cBN陶瓷基超硬材料具有优异的耐磨性能。

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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.