制备工艺对原位合成(Al_2O_3+Si)_p/Al复合材料显微组织影响及体系分析
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摘要
以Al-SiO_2为反应体系,通过烧结反应原位合成了(Al_2O_3+Si)_p/Al复合材料。研究了第二相含量、烧结时间以及热锻压等工艺对(Al_2O_3+Si)_p/Al复合材料的第二相形貌、尺寸及分布的影响,探讨了原位合成(Al_2O_3+Si)_p/Al复合材料的生成机制。研究表明,Si相含量随着第二相含量的增多而增多且与Al和Al_2O_3相界限相对明显;随着烧结时间的延长,Si相面积相对减小,Al_2O_3相的数量相对增加;锻压后,Si相和Al_2O_3分布更加均匀且尺寸减小。复合材料在液相烧结的过程中,高温下的液相粘性流动以及在原位反应时发生的颗粒重排与固相的溶解和沉淀对材料的致密化产生了较大的作用,当烧结温度达到1000℃时,Al_2O_3颗粒数量、分布情况都得到明显地改善。
In-situ(Al_2O_3+Si)_p/Al composites were synthesized by reaction sintered method from AlSiO_2 system.The effects of content of second phase,sintering time and forging on the reinforced particles in(Al_2O_3+Si)_p/Al composites were instigated.The phase sintering mechanism in-situ synthesized(Al_2O_3 +Si)_p/Al composites was discussed and analyzed.The result shows that when the content of second phase increases,the content of Si phases increase significantly and the interfaces between them gets remarkable.The area of Si phase decreases and the number of Al_2O_3 increases as the sintering time prolonged.The forging significantly improves the distribution of Al_2O_3 and Si phase and the grains are also refined.In the sintering process,the densification depends on fluidity of liquid phase at high temperature,rearrangement and solutionprecipitation stage.When the sintering temperature increase to 1000℃,the number of particle distribution of Al_2O_3 are considerably improved.
In-situ(Al_2O_3+Si)_p/Al composites were synthesized by reaction sintered method from AlSiO_2 system.The effects of content of second phase,sintering time and forging on the reinforced particles in(Al_2O_3+Si)_p/Al composites were instigated.The phase sintering mechanism in-situ synthesized(Al_2O_3 +Si)_p/Al composites was discussed and analyzed.The result shows that when the content of second phase increases,the content of Si phases increase significantly and the interfaces between them gets remarkable.The area of Si phase decreases and the number of Al_2O_3 increases as the sintering time prolonged.The forging significantly improves the distribution of Al_2O_3 and Si phase and the grains are also refined.In the sintering process,the densification depends on fluidity of liquid phase at high temperature,rearrangement and solutionprecipitation stage.When the sintering temperature increase to 1000℃,the number of particle distribution of Al_2O_3 are considerably improved.
引文
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[4]Yuna Wu,Hengcheng Liao.Corrosion Behavior of Extruded near Eutectic Al-Si-Mg and 6063 Alloys[J].Journal of Materials Science Technology,2013,04:380~386.
[5]武玉英,刘相法,等.硅相形态及含量对Al-Si合金线膨胀系数的影响[J].中国有色金属学报,2007,5:688~692.
[6]贾志宏,熊兰兰,朱翔,等.工艺因素对Al-Si合金熔体粘度的影响[J].材料科学与工程学报,2013,31(3):414~417.
[7]A.Abedi,M.Shahmiri,B.Amir Esgandari,B.Nami.Microstructural Evolution during Partial Remelting of Al—Si Alloys Containing Different Amounts of Magnesium[J].Journal of Materials Science Technology,2013,10:971~978.
[8]蔡志勇,王日初,张纯,等.快速凝固过共晶Al-Si合金的显微组织及其热稳定性[J].中国有色金属学报,2015,3:618~625.
[9]高青,赵忠魁,刘波祖,孙清洲,王桂青.铸造Al-Si系合金中的合金元素的作用[J].材料导报,2014,9:74~78+91.
[10]黄俊.无压浸渗法制备β-SiC/Al电子封装材料及其性能研究[D].西安科技大学硕士学位论文,王晓刚,西安,西安科技大学,2011,6.
[11]杨奔,蒋阳,等.Al-50Si合金电子封装材料的热压法制备及性能表征[J].粉末冶金工业,2012,5:24~28.
[12]李晓烨,杨滨,等.新型TiB_2/Si-Al电子封装复合材料的微观组织及其导热性能[J].热处理技术与装备,2015,6:28~33.
[13]杨军.电子封装用Si-Al系列合金组织与性能研究[D].中南大学硕士学位论文,余琨,长沙,中南大学,2010,6.
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