Preparation of B<sub>4</sub>C/Al-Si Composites

Zhang Youfa; Yu Xinquan; Chen Feng; Yu Liang

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Preparation of B₄C/Al-Si Composites
Vol. 30, Issue 4, Pages: 367-369(2010)
Published： 2010 ，
DOI：

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[1]张友法,余新泉,陈锋,于良.B_4C/Al-Si复合材料的制备[J].特种铸造及有色合金,2010,30(04):367-369+291.

Zhang Youfa, Yu Xinquan, Chen Feng, et al. Preparation of B₄C/Al-Si Composites. [J]. Special Casting & Nonferrous Alloys 30(4):367-369(2010)
[1]张友法,余新泉,陈锋,于良.B_4C/Al-Si复合材料的制备[J].特种铸造及有色合金,2010,30(04):367-369+291. DOI：

Zhang Youfa, Yu Xinquan, Chen Feng, et al. Preparation of B₄C/Al-Si Composites. [J]. Special Casting & Nonferrous Alloys 30(4):367-369(2010) DOI：

摘要

采用真空无压烧结法

制备了多孔碳化硼（B4C）骨架

致密度为46.8%。然后采用真空无压浸渗法

以A356铝合金为渗体

与B4C骨架进行复合。制备了B4C/Al-Si复合材料

致密度达99%以上

抗压强度为453MPa

弯曲强度为294MPa。微观结构分析结果表明

制备的复合材料组织致密

形成的Al、Si、Al3BC相分布均匀

界面复合良好。Al主要分布在B4C颗粒间

Si相主要分布在B4C和Al的界面处

使B4C和Al紧密结合

且试样的表面和心部均有分布均匀的Al存在。制备的B4C/Al-Si复合材料中B4C形成连续的骨架结构

而孔隙处的金属相则起到增韧、增强的作用。

Abstract

Connected ceramic preforms （B4C） with porosity of 46.8% were fabricated by pressureless sintering in vacuum

then B4C/Al-Si composites with high ceramic fraction were prepared by pressureless infiltrating aluminum alloy A356 into the boron carbide preforms B4C

whose relative density

compressive strength and flexure strength are more than 99%

453MPa and 294MPa

respectively. Microstructural observation reveals that prepared composites exhibit compact structure and desirable interface bonding

in which formed Al

Si and Al3BC phases are uniformly distributed. Al phase is mainly distributed in the cavity of B4C frames and Si mainly existed in the interface of B4C and Al phase

which results in the tough combination of B4C and Al phases

meanwhile

uniformly distributed Al phase can be observed in surface and inner of composite samples. B4C ceramics is formed continuous frame in the fabricated B4C/Al-Si composites and metallic phase existed in the cavity plays the role in toughening and strengthening effects.