包覆CaCO_3制备泡沫镁合金的研究
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摘要
选用Ca粒作为增粘剂,经包覆后的Ca CO_3粉末作为发泡剂,采用熔体发泡法制备了闭孔泡沫镁材料。为了减缓Ca CO_3在高温下的分解,采用溶胶-凝胶法包覆了Ca CO_3粉末。结果表明,以Ca粒为增粘剂,包覆后的Ca CO_3粉末为发泡剂,采用熔体发泡法可制备出低密度、高孔隙率的泡沫镁材料;随着增粘温度和发泡温度的增加,孔隙率先增大后减小;当增粘温度为720℃或者发泡温度为740℃时,孔隙率达到最大值;密度的变化规律与孔隙率的变化规律相反。
Taking calcium particles as tackifier and coated Ca CO_3 powder as foaming agent, the foamed Mg material with close cells was fabricated by melt foaming method. In order to delay the decomposition of Ca CO_3 powder at high temperature,sol-gel method was employed to coat the Ca CO_3 powder. The results show that taking calcium particles as tackifier and coated Ca CO_3 powder as foaming agent, the foam magnesium material with low density and high porosity can be prepared by melt foaming method; with the increase of tackifying temperature and foaming temperature, the porosity increases firstly and then decreases; when the tackifying temperature is 720 ℃ or the foaming temperature is 740 ℃, the porosity reaches the maximum value; the change regulation of the density is opposite to the change regulation of the porosity.
Taking calcium particles as tackifier and coated Ca CO_3 powder as foaming agent, the foamed Mg material with close cells was fabricated by melt foaming method. In order to delay the decomposition of Ca CO_3 powder at high temperature,sol-gel method was employed to coat the Ca CO_3 powder. The results show that taking calcium particles as tackifier and coated Ca CO_3 powder as foaming agent, the foam magnesium material with low density and high porosity can be prepared by melt foaming method; with the increase of tackifying temperature and foaming temperature, the porosity increases firstly and then decreases; when the tackifying temperature is 720 ℃ or the foaming temperature is 740 ℃, the porosity reaches the maximum value; the change regulation of the density is opposite to the change regulation of the porosity.
引文
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[2]Rao L J M.Handbook of membrane separations:chemical,pharmaceutical,food,and biotechnological applications[J].International Journal of Food Science&Technology,2009,44(7):1464-1466.
[3]Yang D H,Yang S R,Wang H,et al.Compressive properties of cellular Mg foams fabricated by melt-foaming method[J].Materials Science&Engineering A,2010,527(21/22):5405-5409.
[4]张赞,陈晓伟,夏兴川,等.多孔镁合金的研究现状[J].特种铸造及有色合金,2015,35(6):580-585.
[5]胡中芸,杨东辉,李军,等.泡沫镁的制备及其性能和应用[J].材料导报,2014,28(1):79-85.
[6]张士卫.泡沫金属的研究与应用进展[J].粉末冶金技术,2016,34(3):222-227.
[7]李进生,孔建.泡沫Mg合金铸造生产过程中的安全问题探究[J].热加工工艺,2014,43(9):89-91
[8]李杰,游晓红,王录才,等.熔模法制备通孔泡沫金属的研究现状[J].铸造设备与工艺,2016(1):50-53.
[9]刘源,李言祥,张华伟,等.金属-气体共晶定向凝固工艺参数对藕状多孔金属镁结构的影响[J].稀有金属材料与工程,2005,34(7):1128-1130.
[10]林金宝,王渠东,彭立明.泡沫镁合金的熔体发泡制备方法:CN101135015A[P].2008-03-05.
[11]王渠东,林金宝,彭涛.粉末压制制备多孔泡沫镁的方法:CN101135012A[P].2008-08-05.
[12]夏兴川,冯俊龙,黄建,等.一种闭孔泡沫镁合金复合材料的制备方法:CN104313383A[P].2015-10-11.
[13]王超星,王芳,武建国,等.泡沫镁CPU散热性能的影响因素分析[J].铸造设备与工艺,2012(4):11-13.
[14]Li P,Nguyen N V,Hao H.Dynamic compressive behaviour of Mg foams manufactured by the direct foaming process[J].Materials&Design,2016,89:636-641.
[15]Matz A M,Mocker B S,Müller D W,et al.Microstructural design and manufacturing of open-pore metal foams by investment casting[J].Advances in Materials Science&Engineering,2014(421/729):1-9.
[16]吴照金,王艳明.铝熔体泡沫化制备胞状铝的研究进展[J].铸造,1999(4):1-5.