PCM法泡沫铝泡体稳定机制的研究
发布时间：2019-03-11 11:38
【摘要】：泡沫铝是一种非常独特的多孔泡沫材料，由于其是由气孔与铝金属共同组成的复合材料，因此具有较为宽广的功能性和结构性。泡沫铝具有低密度、高孔隙率的特点，具有吸声、降噪、减震等功能性。由于其独特性，泡沫铝在近几年的研究中已经成为了国内外研究学者的主要研究内容。 本文采用PCM法，分别以纯铝粉，合金元素粉末，不同粒度TiH2为发泡剂，通过挤压的方式制备泡沫铝预制体。再通过不同的发泡温度，对预制体进行发泡。论文研究了TiH2粒度，Mg元素添加量对泡沫铝膨胀度及孔结构的影响，，通过实验制定最佳发泡参数制备发泡效果最好的泡沫铝，并研究其相应的发泡机制，通过得到的结论再进一步对多个泡沫铝预制体件进行结合实验的研究。 实验结果表明：发泡剂粒度的不同对于泡沫铝发泡有很大的影响。发泡剂粒度越大，释氢温度越高，粒度的一致性越好，分布均匀。发泡温度为740℃时，TiH2含量为0.4%，粒度在200-300目范围内制备的的泡沫铝的膨胀度最高，密度较低，孔结构较为均匀、稳定。当以Al-8Si合金粉末为基体，Mg添加量为4%，TiH2含量为1%，发泡温度在690℃时，可制备出高膨胀度的，泡孔更加均匀稳定的高质量泡沫铝。当以Al-4Mg-8Si粉末作为发泡结合件的基体时，可制备高膨胀度的泡沫铝结合件。结合过程中，氧化膜是通过机械力作用的方式进行机械结合。无论是否添加合金元素，氧化膜都无法消除。泡体内部泡孔是通过冶金结合的方式，扩散结合。
[Abstract]:Aluminum foam is a kind of unique porous foam material. Because it is a composite material composed of pores and aluminum metal, it has wide functional and structural properties. Aluminum foam has the characteristics of low density, high porosity, sound absorption, noise reduction, shock absorption and other functions. Because of its uniqueness, aluminum foam has become the main research content of scholars at home and abroad in recent years. In this paper, aluminum foams were prepared by extrusion with pure aluminum powder, alloying element powder and different particle size of TiH2 as foaming agent by PCM method. Then the preform was foamed at different foaming temperatures. The effects of particle size of TiH2 and addition of Mg on the expansion degree and cellular structure of aluminum foams were studied in this paper. The best foaming parameters were determined by experiments, and the foaming mechanism of aluminum foams was studied. The combination experiments of several foamed aluminum prefabricated parts are further studied by the conclusions obtained in this paper. The experimental results show that the different particle size of foaming agent has a great influence on the foaming of aluminum foam. The larger the foaming agent size is, the higher the hydrogen release temperature is, the better the consistency of particle size is, and the more uniform the distribution is. When the foaming temperature is 740 鈩
本文编号：2438247
[Abstract]:Aluminum foam is a kind of unique porous foam material. Because it is a composite material composed of pores and aluminum metal, it has wide functional and structural properties. Aluminum foam has the characteristics of low density, high porosity, sound absorption, noise reduction, shock absorption and other functions. Because of its uniqueness, aluminum foam has become the main research content of scholars at home and abroad in recent years. In this paper, aluminum foams were prepared by extrusion with pure aluminum powder, alloying element powder and different particle size of TiH2 as foaming agent by PCM method. Then the preform was foamed at different foaming temperatures. The effects of particle size of TiH2 and addition of Mg on the expansion degree and cellular structure of aluminum foams were studied in this paper. The best foaming parameters were determined by experiments, and the foaming mechanism of aluminum foams was studied. The combination experiments of several foamed aluminum prefabricated parts are further studied by the conclusions obtained in this paper. The experimental results show that the different particle size of foaming agent has a great influence on the foaming of aluminum foam. The larger the foaming agent size is, the higher the hydrogen release temperature is, the better the consistency of particle size is, and the more uniform the distribution is. When the foaming temperature is 740 鈩
本文编号：2438247
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