消失模铸造模样材料结构及其燃烧性能研究
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摘要
通过美国康塔NOVA 2000e比表面积及孔径分析仪、扫描电子显微镜和差热热重同时测定装置对EPS和STMMA两种消失模材料的比表面积和显微结构进行了表征分析,实测了温度和时间对这两种材料燃烧性能的影响.结果表明:与EPS相比,STMMA的比表面积较大、粒径较小,且有较多的蜂窝状微孔;在相同的燃烧时间下,STMMA燃烧较快,残余物较少;在同一温度下,EPS和STMMA的残余率均随着燃烧时间的增加而减小,但STMMA的残余率更小;采用STMMA生产的铸件机加工5mm左右就无黑渣,较EPS底面的黑渣缺陷大幅度减少.
The specific surface area and microstructure of EPS and STMMA were analyzed by means of the NOVA2000 e specific surface area and pore size analyzer,SEM and differential thermogravimetric analysis. It measured the influence of temperature and time on the combustion of the two kinds of materials.The results show that compared with EPS,STMMA has larger specific surface area,smaller particle size,and more cellular micropores. At the same burning time,STMMA burned faster with fewer residues.Under the same temperature,the residual rate of EPS and STMMA decreased with the increase of combustion time,but the residual rate of STMMA is smaller.The castings produced by STMMA have no black slags while machined deep to around 5 mm,and the defects of black slags on the bottom of EPS is greatly reduced.
The specific surface area and microstructure of EPS and STMMA were analyzed by means of the NOVA2000 e specific surface area and pore size analyzer,SEM and differential thermogravimetric analysis. It measured the influence of temperature and time on the combustion of the two kinds of materials.The results show that compared with EPS,STMMA has larger specific surface area,smaller particle size,and more cellular micropores. At the same burning time,STMMA burned faster with fewer residues.Under the same temperature,the residual rate of EPS and STMMA decreased with the increase of combustion time,but the residual rate of STMMA is smaller.The castings produced by STMMA have no black slags while machined deep to around 5 mm,and the defects of black slags on the bottom of EPS is greatly reduced.
引文
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[3]赖春明,谭海林,张麦秋.消失模-壳型复合铸造EPS泡沫模样表面的光整工艺研究[J].金属加工:热加工,2016(17):72-74.
[4]朱文文,杨争光,原晓雷.消失模模样板材生产工艺研究[J].中国铸造装备与技术,2015(2):72-75.
[5]Q XU,C JIN,Y JIANG.Analysis of the relationship between MCC and thermal analysis results in evaluating flammability of EPS foam[J].Journal of Thermal Analysis and Calorimetry,2014,118(2):687-693.
[6]Q XU,C JIN,G GRIFFIN,et al.Fire safety evaluation of expanded polystyrene foam by multi-scale methods[J].Journal of Thermal Analysis and Calorimetry,2014,115(2):1 651-1 660.
[7]胡仙林.苯乙烯与甲基丙烯酸甲酯共聚制备气化模材料研究[D].武汉:武汉工程大学,2015.
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[9]周晓光.低碳合金钢斗齿铸造新工艺的研究[D].武汉:华中科技大学,2012.
[10]黄刚,叶升平,于惠明,等.基于制动钳的无薄膜消失模工艺[J].铸造,2013,62(1):51-54.
[11]赵杰.不同密度及放置角度下EPS保温材料着火及火蔓延特性研究[D].马鞍山:安徽工业大学,2016.