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euying木虫 (小有名气)
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[求助]
求助论文一段摘要中译英 400字左右
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| 研究了二氧化硅粉末的粒径和颗粒级配对复合材料性能的影响，特别是对孔径分布的影响。选用了四种不同粒径的二氧化硅粉末，试验结果表明二氧化硅粉末的粒径对复合材料的玻璃化转变温度和压缩性能没有明显的影响。复合材料的吸水率随着粉末粒径的增大而出现小幅度的提升。根据Dinger-Funk模型，挑选了粒径合适的两种二氧化硅粉末进行颗粒级配，借助Matlab软件计算出了达到最紧密堆积状态时，两种二氧化硅粉末的质量分数分别为92%和8%。研究了颗粒级配对材料压缩性能、吸水率和孔径分布的影响，发现材料压缩性能基本不受颗粒级配的影响。随着二氧化硅粉末SS-1质量分数的提高，材料的吸水率呈现降低的趋势。材料具有广泛的介孔分布，孔径基本全部分布在2～12 nm之间，孔径分布没有明显的规律。当SS-1质量分数为92%，颗粒体系处于最紧密堆积状态时，材料的BJH脱附平均孔径和BET多点比表面积最小，并且与材料吸水率随着SS-1质量分数的变化是一致的，这都验证了颗粒级配的合理性和适用性。 |
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灿灿妹
至尊木虫 (著名写手)
- 翻译EPI: 68
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- 专业: 环境工程
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euying: 金币+99, 翻译EPI+1, ★有帮助 2015-04-21 09:31:01
euying: 金币+99, 翻译EPI+1, ★有帮助 2015-04-21 09:31:01
| The effects of grain sizes and grain composition of silica powders to the properties of the composite materials were investigated, especially the effects to pore size distribution. In this study, four different size silica powders were selected to test, the experimental results showed that the grain sizes of silica powders had no influence to the glass transition temperature and compression performance of the composite materials. Water absorption of the composite materials promoted slight with the increasing of the grain sizes. Two silica powders with reasonable grain sizes were selected and used for grain composition based on the Dinger-Funk model, then, the mass fraction(92% and 8%, respectively) of the two silica powders in the most closely accumulated state were calculated by using Matlab. The effects of grain composition to compression performance, water absorption and pore size distribution were studied and found that grain composition has no effect on compression performance of the composite materials. The water absorption has a trend of decrease with the increasing of mass fraction of SS-1 silica powde. The materials had widely pore size distributions, which were basically concentrated in 2-12nm and had on obvious correlation. The average pore size of BJH desorption and multipoint BET were the smallest when the mass fraction of SS-1 was 92% and the system was in the most closely accumulated state, which was consistent with the water absorption changeed with the mass fraction of SS-1, and the reasonable and applicable of grain composition were verified simultaneously. |
2楼2015-04-21 08:46:04