Reaction Mechanism of Nano-sized Al2O3p/Al Composites Prepared in Al-SiO2 System

Mou Shuyu; Chen Gang; Zhang Zhenya; Zhao Yutao; Zhang Hui; Xu Jiasheng; Zhang Ting

doi:10.15980/j.tzzz.2020.08.018

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Reaction Mechanism of Nano-sized Al₂O_3p/Al Composites Prepared in Al-SiO₂ System
Vol. 40, Issue 8, Pages: 883-887(2020)
Published： 2020 ，
DOI： 10.15980/j.tzzz.2020.08.018

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[1]牟姝妤,陈刚,张振亚,赵玉涛,张慧,徐家盛,张婷.Al-SiO_2体系反应生成纳米Al_2O_(3p)/Al复合材料的机理[J].特种铸造及有色合金,2020,40(08):883-887.

Mou Shuyu, Chen Gang, Zhang Zhenya, et al. Reaction Mechanism of Nano-sized Al₂O_3p/Al Composites Prepared in Al-SiO₂ System. [J]. Special Casting & Nonferrous Alloys 40(8):883-887(2020)
[1]牟姝妤,陈刚,张振亚,赵玉涛,张慧,徐家盛,张婷.Al-SiO_2体系反应生成纳米Al_2O_(3p)/Al复合材料的机理[J].特种铸造及有色合金,2020,40(08):883-887. DOI： 10.15980/j.tzzz.2020.08.018.

Mou Shuyu, Chen Gang, Zhang Zhenya, et al. Reaction Mechanism of Nano-sized Al₂O_3p/Al Composites Prepared in Al-SiO₂ System. [J]. Special Casting & Nonferrous Alloys 40(8):883-887(2020) DOI： 10.15980/j.tzzz.2020.08.018.

摘要

采用放热弥散法

利用Al和纳米SiO

混合粉末

原位制备了纳米α-Al

/Al复合材料。用X射线衍射仪、扫描电镜、差示扫描量热法以及能谱仪分析了复合材料的组织组成

并研究了该体系的反应机理。结果表明

Al-纳米SiO

体系经900℃保温30 min可以反应完全

生成纳米Al

和Si

其中纳米Al

的体积分数可达7%且在铝基体上均匀分布;该体系的反应激活能随着反应的进行不断提高

说明在该体系化学反应的最后阶段必须提供足够能量

才能保证反应进行完全。

Abstract

Nano-sized α-Al

/Al composite was prepared in situ by exothermic dispersion method using the mixed powder of Al-nano-SiO

. The microstructure and reaction mechanism of the composite were investigated by X-ray diffraction（XRD）

scanning electron microscopy（SEM）

differential scanning calorimetry（DSC） methods

and energy spectrometer（EDS）. The results reveal that Al-nano-SiO

can react completely to form nano-sized Al

and Si at 900 ℃ for 30 min

in which the volume fraction of the reinforcement can reach 7% with evenly distributed on the aluminum matrix. The corresponding activation energy is increased with the reaction process

indicating that the reaction of Al-nano-SiO

system can be completed only when sufficient energy is provided in the final reaction stage.