PCM法泡沫鋁泡體穩(wěn)定機制的研究
發(fā)布時間：2019-03-11 11:38
【摘要】：泡沫鋁是一種非常獨特的多孔泡沫材料，由于其是由氣孔與鋁金屬共同組成的復合材料，因此具有較為寬廣的功能性和結(jié)構性。泡沫鋁具有低密度、高孔隙率的特點，具有吸聲、降噪、減震等功能性。由于其獨特性，泡沫鋁在近幾年的研究中已經(jīng)成為了國內(nèi)外研究學者的主要研究內(nèi)容。 本文采用PCM法，分別以純鋁粉，合金元素粉末，不同粒度TiH2為發(fā)泡劑，通過擠壓的方式制備泡沫鋁預制體。再通過不同的發(fā)泡溫度，對預制體進行發(fā)泡。論文研究了TiH2粒度，Mg元素添加量對泡沫鋁膨脹度及孔結(jié)構的影響，，通過實驗制定最佳發(fā)泡參數(shù)制備發(fā)泡效果最好的泡沫鋁，并研究其相應的發(fā)泡機制，通過得到的結(jié)論再進一步對多個泡沫鋁預制體件進行結(jié)合實驗的研究。 實驗結(jié)果表明：發(fā)泡劑粒度的不同對于泡沫鋁發(fā)泡有很大的影響。發(fā)泡劑粒度越大，釋氫溫度越高，粒度的一致性越好，分布均勻。發(fā)泡溫度為740℃時，TiH2含量為0.4%，粒度在200-300目范圍內(nèi)制備的的泡沫鋁的膨脹度最高，密度較低，孔結(jié)構較為均勻、穩(wěn)定。當以Al-8Si合金粉末為基體，Mg添加量為4%，TiH2含量為1%，發(fā)泡溫度在690℃時，可制備出高膨脹度的，泡孔更加均勻穩(wěn)定的高質(zhì)量泡沫鋁。當以Al-4Mg-8Si粉末作為發(fā)泡結(jié)合件的基體時，可制備高膨脹度的泡沫鋁結(jié)合件。結(jié)合過程中，氧化膜是通過機械力作用的方式進行機械結(jié)合。無論是否添加合金元素，氧化膜都無法消除。泡體內(nèi)部泡孔是通過冶金結(jié)合的方式，擴散結(jié)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
本文編號：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
本文編號：2438247
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