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is due to short length of PVA fiber (8 mm) used in this study. The PVA-T1 fiber type due to its greater length and modulus of elasticity in comparison to other PVA fibers was selected as reinforcing... J. Cent. South Univ. (2018) 25: 51-59 DOI: https://doi.org/10.1007/s11771-018-3716-9 Tensile properties of strain-hardening cementitious composites containing polyvinyl-alcohol fibers hybridized......
reaction model, and the corresponding apparent activation energy and pre-exponential factor are 505.82 kJ/mol and 2.16×1014 s-1 respectively. Key words: calcium silicate compounds; formation kinetics... sinter process to produce alumina from low-grade aluminum resources, which can significantly reduce the lime addition and the corresponding residue amount. However, the formation mechanism of CS in low......
and NaCl) could significantly accelerate the oxidation process of the alloy. STEM results indicate that the corroded scale consists mainly of TiO2, Nb2O5, TiNb2O7, amorphous silicate and NaNbO3. Key words: Nb-Si based alloys; molten salts; oxidation; hot corrosion; silicate 1 Introduction The need for high performance structural materials in aerospace and industrial components operating at high......
which produces alumina concentrate for alumina extraction by the Bayer process; 2) synthesizing tobermorite whiskers from the filtrated alkali liquor containing silicate via a hydrothermal method.../L NaOH liquor,and agitated at 20 r/min. Filtration was performed immediately after leaching, and alumina concentrate and alkali liquor containing silicate were collected, respectively. Fig. 1......
of 1173~1473 K in synthetic air for 100 h. The formation of the alumina layer approximately obeyed the parabolic rate law, with the exception of short initial stage. The parabolic rate constant values for the Zr-doped Fe3Al decreased at all tested temperatures. Fe3Al revealed massive spallation, whereas Fe3Al-Zr produced a fiat, adherent oxide layer. The microstructure investigations of the alumina......
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Microstructure evolution of rare earth Pr modified alumina-silicate short fiber-reinforced Al-Si metal matrix compositesPENG Jihua,LI Wenfang,HUANG Fangliang,TIAN Jun,LIU Gang,and DU Jun School....% alumina-silicate shot fibers (Al2O3-SiO2(sf)) were fabricated by an infiltration squeeze method. Pure Pr metal was added into these composites. The effect of Pr addition on the microstructure......
Nd3+ Doped Silicate Glass Photonic Crystal Fiber with Random Hole Distributions杨旅云,陈丹平,达宁,汪晨,彭明营,赵崇军,周秦岭,姜雄伟,陈庆希,朱从善,邱建荣摘 要:<正>The fabrication of one kind of large core area Nd3 + doped silicate glass photonic crystal fiber, and demonstration of the fiber’s waveguidence properties were reported. This fiber owns a random air hole distribution......
on the glass forming ability of matrix. However, as a new kind of matrix material, data on wettability of these molten alloys on reinforcements are rather scarce. Alumina particles or fibers are usually...Wetting behavior of Zr55Cu30Al10Ni5 melt on alumina XU Qian-gang(徐前刚)1, 2, ZHANG Hai-feng(张海峰)2, HU Zhuang-qi(胡壮麒)2 (1. Department of Materials Science and Engineering,Shenyang Institute......
Effect of Na2O on alumina leaching property and phase transformation of MgO-containing calcium aluminate slags WANG Bo, SUN Hui-lan, GUO Dong, ZHANG Xue-zheng School of Materials Science... aluminate slags, the method of adding Na2O into calcium aluminate slags was studied and its effect on leaching mechanism was also analyzed. The results show that the alumina leaching efficiency......
