Al_4C_3的形成及对Gr-Al-Si复合材料的作用

Formation of AI_4C_3 Phase and Its Effects on the Graphite (Gr)-Al-Si Composites

Al4 C3 的生成会影响Gr Al Si复合材料的界面反应。然而研究证明在原料中少量的Al4 C3 存在 ,有利于提高石墨分布的均匀性 ,又不影响该材料的高温抗拉强度等综合性能。Al4 C3 的形成温度以 5 5 0～ 6 0 0℃为宜。Al4 C3 的含量可用X射线定量分析来确定。

It is reported in the literature that the formation of Al 4C 3 can affect the interface reaction of Gr-Al-Si composites. In this paper, however, the results showed that the presence of a small amount of Al 4C 3 phase in raw materials is beneficial to improve u-niform distribution of graphite without detriment to tensile strength of the materials at high temperature. An alternative available approach was presented for preparing qualified Gr-Al-Si composite in gravity casting. The proper Al 4C 3 phase formation temperature ranged from 550 to 600 ℃. Amount of Al4C3 can be measured by X-ray quantitative analysis.