采用压力浸渗技术制备Si_p/LG5复合材料并对其进行高温扩散处理.组织观察表明:复合材料增强体形貌经过高温扩散处理后由不规则的尖角形状转变为三维网络结构(3D).对3D-Si/LG5复合材料界面的研究表明,与高温扩散处理前复合材料的界面相比,三维网络结构3D-Si/LG5复合材料的界面更光滑,界面结合程度也更好.三维网络结构3D-Si/LG5复合材料界面处及基体合金内部有Si析出,基体合金中存在着孪晶;三维网络结构3D-Si/ LG5复合材料的平均线膨胀系数与高温扩散处理前相比,降低了10.5%;增强体三维网络化减少界面及基体中大量细小弥散的Si析出,使得三维网络3D-Si/ LG5复合材料的热导率变化不大.
Dense and uniform Si_p/LG5 composites were fabricated by squeeze casting process, and then were treated by high temperature diffusion. Microstructure observation indicated that Si transformed from irregular sharp-particles to 3D network structure after high temperature diffusion treatment. Si-Al interface of 3D-Si_p/LG5 composites is smoother and has better bonding degree, compared with the interface of the untreated composites. There are Si precipitation in the interface and the matrix of 3D-Si_p/LG5 composites. Twin crystals were observed in the matrix of 3D-Si_p/LG5 composites. The average linear thermal expansion (CTE) of the composites is decreased by 10.5% after high temperature diffusion treatment. However, the thermal conductivity of 3D-Si_p/LG5 composites does not change significantly due to the decreased Si precipitation in the interface and matrix by 3D network structure of Si.
参考文献
| [1] | 赵龙志,方志刚,曹小明,田冲,胡宛平,张劲松.骨架结构对SiC/Al双连续相复合材料的影响[J].中国有色金属学报,2006(06):945-950. |
| [2] | 王晓峰 .三维网络结构Si-Al复合材料的制备工艺与性能研究[D].Harbin:Harbin Institute of Technology,2006. |
| [3] | Aldrich D E;Fan Z .[J].Materials Characterization,2001,47:167. |
| [4] | 林均品,张勇,陈国良.骨架增强复合材料的微观结构和性能[J].材料工程,2000(06):20-21. |
| [5] | 周伟,胡文彬,张荻.三维连续网络结构增强金属基复合材料及其制备[J].科学通报,1999(06):608-612. |
| [6] | 崔岩;张祝伟;陈续东 .[J].中国有色金属学报,2005,15(02):139. |
| [7] | 洪长青,韩杰才,张幸红,赫晓东,孟松鹤.浸渗法制备双连续TiB2/（Cu,Ni）复合材料的组织和性能[J].材料科学与工艺,2006(02):151-154. |
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