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and products prepared by carbon assisting hydrogen reduction of precursor at different temperatures for 1 h 偏钨酸铵粉末与葡萄糖以W,C摩尔比1:2.6的比例混合煅烧后制备的前驱体以及前驱体分别在700,750,800 ℃下还原1 h后产物的SEM像如图2所示.由图2(a)中可以看出,前驱体粉末呈...SEM像 Fig. 2 SEM images of products prepared by carbon assisting hydrogen reduction of precursor with tungsten carbon molar ratio of 1:2.6 at different temperatures for 1 h 而C与H2O反应生成的CO会与W发生反应生成......
J. Cent. South Univ. Technol. (2008) 15(s1): 275-279 DOI: 10.1007/s11771-008-362-7 Influence of rheological parameters in all drag reduction regimes of turbulent channel flow with polymer... of rheological parameters on vortex dynamics and the extent of drag reduction (DR) were deciphered via extensively analyzing the hi-fidelity direct numerical simulation results of the turbulent channel......
Application of soft reduction technique to continuous-casting billetsMingzhong Liu, Jingshe Li, Shiqi Li,, Hongjun Yan, Yingjun Fan, and Mingsheng YangMetallurgical and Ecological Engineering School... reduction technique can decrease the presence of central porosity and centerline segregation, and thus to enhance the internal quality effectively. In order to produce high quality billets, Xinxing Ductile......
Preparation of ferromagnetic binary alloy fine fibers by organic gel-thermal reduction process SHEN Xiang-qian(沈湘黔), CAO Kai(曹 凯), ZHOU Jian-xin(周建新) School of Materials Science and Engineering... reduction process from the raw materials of critic acid and metal salts. These alloy fibers synthesized were featured with a diameter of about 1 μm and a length as long as 1 m. The structure, thermal......
On Niobium Reduction in Blast Furnace董一诚,杨天钧,孟涛,王振峰摘 要:<正> The Baotou Iron Ore of China contains very high niobium. This paper reported the results through laboratory and practical experiments on niobium enrichment in blast furnace. The effect of temperature, constituents of slag and silicon content in hot metal on niobium recovery was studied......
of ferromagnetic metal fine fibers by organic gel-thermal reduction process CAO Kai(曹 凯), SHEN Xiang-qian(沈湘黔), JING Mao-xiang(景茂祥), ZHOU Jian-xin(周建新) (School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China) Abstract: The organic gel-thermal reduction process was used for the preparation of ferromagnetic metal Ni, Co and Fe fine fibers from the raw materials......
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New Steel Making Process through Reduction and Sintering of Cementite Powder N.OUCHIDA1,T.TSUCHIYAMA1,K.NAKASHIMA1,S.TAKAKI1,M.EGASHIRA2 (1.Department of Materials Science and Engineering, Kyushu University;2.Sumitomo Metal Industries, Ltd) 摘要:A new steel making process through reduction and sintering treatment of cementite powder was proposed, and microstructure of the material obtained......
PREPARATION OF IRON CARBIDE FROM MAGNETITE PELLETS BY CO-H2 MIXTURES REDUCTION J.P.Jiang1,D.Q.Cang1,H.W.Ni2 (1.School of Metallurgy,University of Science and Technology Beijing,Beijing 100083,China... can be divided into two stages: reduction ofmagnetite pellets and carburization of reduction product.The carbon deposition has agreat influence on formation of iron carbide.In order to get a high......
钢种和断面对连铸板坯轻压下效率的影响林启勇1,朱苗勇2(1.重庆市中冶赛迪工程技术股份有限公司自动化事业部2.东北大学 材料与冶金学院,辽宁沈阳 110004)摘 要:结合轻压下效率的理论计算式,考察了板坯断面,钢种对连铸板坯轻压下效率的影响规律.结果表明:压下效率与板坯宽度,厚度呈线性增加关系,板坯宽度每增加15%,压下效率增加约4%;板坯厚度增加15%,压下效率增加约32%;钢种的两相区温度宽度越小,压下效率越高;板坯宽度与钢种对压下效率的影响较小,板坯厚度对压下效率的影响大.关键词:连铸板坯......
