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Abstract <p>In this paper, Mo(Si, Al)<sub>2</sub>-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)<sub>2</sub>-cBN superhard composite were in-situ formed Mo (Si, Al)<sub>2</sub> 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)<sub>2</sub>-cBN superhard composite reached the highest. And also, Mo(Si, Al)<sub>2</sub>-cBN ceramic-based superhard material owned excellent wearing property which was evaluated by friction and wear experiment between W<sub>18</sub>Cr<sub>4</sub>V counter-grinding ring and prepared (Mo(Si, Al)<sub>2</sub>-cBN ceramics block in dry friction model with a load of 49N.</p>

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

  • 期刊论文

  • 发表日期：

    2025年8月1日

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

摘要

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.