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杨依帆 《武汉理工大学学报(材料科学英文版)》2017,32(4):800-805
Hydration mechanism of tabular alumina carbon composites reinforced by Al4C3 in situ reaction with Mg and Al was researched in water steam using super automatic thermostatic water bath from 25 °C to 85 °C. It is shown that hydration mechanism of the composites is chemical reaction control at 44.3 °C-84 °C in H2O(g). The hydration was controlled by diffusion from 24.7 °C to 33 °C. The ratio of added Mg/Al influences the HMOR of the composites.The mechanism of HMOR of the composites with different ratios of Mg/Al can be discovered by means of SEM analysis. The active Mg/Al powder and flake graphite inside give the composites outstanding hot strength resulting from the interlocking structure of Al4C3 crystals at high temperature. Besides, the matrix changes into the Al4C3 with high refractoriness. The method of preventing the hydration of tabular alumina carbon composites reinforced by Al4C3 in situ reaction was immersed in the wax at suitable temperature or storing them below 33 °C in a dry place or storing them with paraffin-coating. 相似文献
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数字与云的音乐时代让人们彻底摆脱随身听、CD唱机和MP3播放器,安装一款音乐App到自己的智能手机,从海量曲库中挑选喜爱的曲目,享爱高品质的音乐已成为许多人的生活方式之一。 相似文献
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通过改变基质成分以及骨料临界粒径大小制备六种高铝浇注料预制件,选用粒度在1 ~3 mm之间的棕刚玉颗粒为磨料,用自由落体式冲蚀磨损试验机在预制件原砖面和内部切面上进行固体颗粒冲蚀试验.研究了高铝浇注料预制件在不同冲蚀角度、磨料速度、冲蚀时间下耐磨性能的变化情况.实验结果表明:在相同冲蚀试验条件下,高铝浇注料预制件原砖面的耐磨性能低于内切面,内部颗粒紧密相嵌,原砖面颗粒堆积松散从而基质占比偏多;骨料临界粒径大的浇注料抗冲蚀磨损性能较好,表面层中基质占比更大,进入稳态冲蚀所需的时间更长. 相似文献
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