真空铝热还原一步法制取镁钙合金的实验研究
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摘要
提出一种以煅烧后的菱镁石和白云石为原料,真空铝热还原一步法制备镁钙合金的方法。通过正交试验研究了四种影响金属还原率主要因素的主次关系,然后对这些因素进行实验研究,并通过ICP发射光谱仪、扫描电子显微镜及X射线衍射对金属产物及还原渣进行了分析。结果表明,铝粉过量系数和制块压力对MgO、CaO还原率的影响较大,还原温度和还原时间次之,在制块压力为150 MPa,还原温度1250℃,还原时间180 min,铝粉过量系数10%的条件下,MgO和CaO还原率最高,分别为93.1%和49.5%。
The Mg-Ca alloy was produced by one-step aluminothermic reduction in vacuum of the compressed block made of the calcined magnesium,dolomite and reductant of recycled Al.The influence of the reduction conditions,including the briquetting pressure,reduction temperature/time,and Al excess coefficient,on the reduction rates of MgO and CaO was investigated in orthogonal experiment and with inductively coupled plasma(ICP) atomic emission spectrometry,scanning electron microscope and X-ray diffraction.The results show that the impact of the Al-excess coefficient and briquetting pressure was greater than that of the reduction-temperature and reduction-time; Reduced at 1250℃ for 180 min and with Al excess coefficient of 10%,the reduction rates of MgO and CaO,in the block briquetted at 150 MPa,were 93.1% and 49.5%,respectively.
The Mg-Ca alloy was produced by one-step aluminothermic reduction in vacuum of the compressed block made of the calcined magnesium,dolomite and reductant of recycled Al.The influence of the reduction conditions,including the briquetting pressure,reduction temperature/time,and Al excess coefficient,on the reduction rates of MgO and CaO was investigated in orthogonal experiment and with inductively coupled plasma(ICP) atomic emission spectrometry,scanning electron microscope and X-ray diffraction.The results show that the impact of the Al-excess coefficient and briquetting pressure was greater than that of the reduction-temperature and reduction-time; Reduced at 1250℃ for 180 min and with Al excess coefficient of 10%,the reduction rates of MgO and CaO,in the block briquetted at 150 MPa,were 93.1% and 49.5%,respectively.
引文
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[3] 何阳,袁秋红,罗岚,等.镁基复合材料研究进展及新思路[J].航空材料学报,2018,38(4):26-36
[4] Liu C,Ren Z,Xu Y,et al.Biodegradable Magnesium Alloys Developed as Bone Repair Materials:A Review[J].Scanning,2018(4):1-15
[5] 张永虎,宋义全,耿丽彦.钙对铸态医用Mg-6%Zn-x%Ca 组织和力学性能的影响[J].热加工工艺,2012,41(11):29-34
[6] 张兴渊,李长青,李全安,等.Ca对Mg-5.5Al-1.2Y镁合金显微组织和力学性能的影响[J].热加工工艺,2012,41(2):24-27
[7] Chino Y,Nakaura Y,Ohori K,et al.Mechanical Properties at Elevated Temperature of a Hot-Deformed Mg-Al-Ca-Mn-Sr Alloy[J].Materials Science and Engineering,2007,A452-453(4):31-36
[8] Watanabe H,Yamaguchi M,Takigawa Y,et al.Mechanical Properties of Mg-Al-Ca Alloy Processed by Hot Extrusion[J].Materials Science and Engineering,2007,A454(16):384-388
[9] Homayun B,Afshar A.Microstructure,Mechanical Properties,Corrosion Behavior and Cytotoxicity of Mg–Zn–Al–Ca Alloys as Biodegradable Materials[J].Journal of Alloys & Compounds,2014,607(24):1-10
[10] Bettles C J,Gibson M A,Venkatesan K.Enhancedage-Hardeningbe-Haviourin Mg-4wt% Zn Micro-Alloy Edwith Ca[J].Scripta Mater,2004,51:193-197
[11] 樊昱,吴国华,高洪涛,等.Ca对镁合金组织、力学性能和腐蚀性能的影响[J].中国有色金属学报,2005,15(2):210-216
[12] Liu C L,Wang Y J,Zeng R C,et al.In Vitro Corrosion Degradation Behaviour of Mg-Ca Alloy in the Presence of Albumin[J].Corrosion Science,2010;52(10):3341-3347
[13] Zheng Y F,Gu X N,Xi Y L,et al.In Vitro Degradation and Cytotoxicity of Mg/Ca Composites Produced by Powder Metallurgy[J].Acta Biomaterialia,2010;6(5):1783-1791
[14] 肖玮,刘卫,张念炳,等.铝酸钙熟料浸出动力学研究[J].轻金属,2009,(8) :23-26
[15] 孙会兰,涂赣峰,毕诗文.七铝十二钙的合成及其在高碳钠铝酸钠溶液中的浸出性能[J].轻金属,2007,(11):17-19
[16] 范娟,阮复昌.铝酸钙的浸出工艺研究[J].应用化工,2002,31(1):1-5