硅含量和钙添加量对铸态镁硅合金热导率的影响。

Effects of Si Content and Ca Addition on Thermal Conductivity of As-Cast Mg⁻Si Alloys.

作者信息

Zhou Xiong, Guo Tian, Wu Shusen, Lü Shulin, Yang Xiong, Guo Wei

机构信息

State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China.

出版信息

Materials (Basel). 2018 Nov 26;11(12):2376. doi: 10.3390/ma11122376.

DOI:10.3390/ma11122376

PMID:30486269

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6316939/

Abstract

The Mg⁻Si alloys have low CTEs (coefficients of thermal expansion) and other merits, which contribute to their application potential in the electronic industry. However, the details of their thermal properties are still unclarified, and need more research. In this study, the thermal conductivities (TC) of Mg⁻Si ( = 1 wt.%, 1.38 wt.%, 2 wt.%, 3 wt.%, and 4 wt.%) binary alloys and Mg⁻4Si⁻Ca ( = 0.2 wt.%, 0.4 wt.%, 0.6 wt.%, 0.8 wt.%, and 1.0 wt.%) alloys over the temperature range of 25⁻300 °C were systematically studied. The results show that the TC of Mg⁻Si binary alloys decreases with the increase of Si content, while it increases slightly near the eutectic composition. The addition of a Ca element to Mg⁻4Si alloys has an obvious modification effect on the Mg₂Si phase. When the Ca content increases constantly, the TC of the alloys decreases at first; then, there is a significant increase at the content of 0.8 wt.% Ca, and after that, it continues to decline. The mechanism is mainly related to the precipitation of the CaMgSi phase at 0.8 wt.% Ca content.

摘要

镁硅合金具有低热膨胀系数（CTE）及其他优点，这使其在电子工业中具有应用潜力。然而，其热性能的细节仍不明确，需要更多研究。在本研究中，系统研究了镁硅（硅含量分别为1 wt.%、1.38 wt.%、2 wt.%、3 wt.%和4 wt.%）二元合金以及镁 - 4硅 - 钙（钙含量分别为0.2 wt.%、0.4 wt.%、0.6 wt.%、0.8 wt.%和1.0 wt.%）合金在25至300 °C温度范围内的热导率（TC）。结果表明，镁硅二元合金的热导率随硅含量的增加而降低，而在共晶成分附近略有增加。向镁 - 4硅合金中添加钙元素对Mg₂Si相有明显的变质作用。当钙含量不断增加时，合金的热导率起初降低；然后，在钙含量为0.8 wt.%时显著增加，之后继续下降。其机制主要与钙含量为0.8 wt.%时CaMgSi相的析出有关。