高导热共晶Al-Si合金的制备及其性能

王剑; 曹东; 许德英

doi:10.15980/j.tzzz.2018.04.025

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高导热共晶Al-Si合金的制备及其性能
Preparation and Properties of the Eutectic Al-Si Alloy with the High Thermal Conductivity
2018年38卷第4期页码：441-445
纸质出版日期： 2018 ，
DOI： 10.15980/j.tzzz.2018.04.025

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[1]王剑,曹东,许德英.高导热共晶Al-Si合金的制备及其性能[J].特种铸造及有色合金,2018,38(04):441-445.

Wang Jian, Cao Dong, Xu Deying. Preparation and Properties of the Eutectic Al-Si Alloy with the High Thermal Conductivity[J]. Special Casting & Nonferrous Alloys, 2018,38(4):441-445.
[1]王剑,曹东,许德英.高导热共晶Al-Si合金的制备及其性能[J].特种铸造及有色合金,2018,38(04):441-445. DOI： 10.15980/j.tzzz.2018.04.025.

Wang Jian, Cao Dong, Xu Deying. Preparation and Properties of the Eutectic Al-Si Alloy with the High Thermal Conductivity[J]. Special Casting & Nonferrous Alloys, 2018,38(4):441-445. DOI： 10.15980/j.tzzz.2018.04.025.

摘要

采用OM、激光导热及直读光谱等手段

研究了Sr、B变质及退火对共晶Al-Si合金组织及热导率的影响。结果表明

通过B+Sr复合变质

共晶Si相由层片状转变为纤维状

杂质含量降低

合金的导热性能得到显著提升。B、Sr加入顺序对合金组织及导热性能有显著影响。经0.02%的B+0.03%的Sr复合变质处理合金的热导率为159.5W/（m·K）

较未变质合金提升约31.2%。经350℃×4h退火处理

B+Sr复合变质合金的热导率为178.8 W/（m·K）

较其铸态合金提升约10.93%。

Abstract

The effects of Sr-B modification and annealing on the microstructure and thermal conductivity of eutectic Al-Si alloy were investigated by the optical microscope

laser flash apparatus and optical emission spectrometer.The results indicate that the flake-like eutectic Si is transformed into the fibrous structure

and the Al matrix purity is improved through B+Sr compound modification

which obviously enhances the thermal conductivity.The addition order of Sr-B has the remarkable effects on the microstructure and thermal property.The thermal conductivity of 0.02%B+0.03%Sr modified alloy reaches159.5 W/（m·K）

increased by 31.2%than that of the unmodified alloy.With the annealing treatment at 350 ℃for 4 h

the thermal conductivity of 0.02%B+0.03%Sr modified alloy reaches 178.8 W/（m·K）

increased by 10.93%than that of the untreated alloy.