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化学共沉淀法制备Ca_2Co_2O_5粉体 林元华1,兰金叻1,赵淑金2,李国晶2,梅骜1 (1.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084;2.佳木斯大学,黑龙江,佳木斯,154007) 摘要:以硝酸钴和硝酸钙为原料,氢氧化钠为沉淀剂,利用化学共沉淀法制备Ca_2Co_2O_5粉体.采用TG-DSC,XRD,SEM和激光粒度分析仪(LPSA)等测试方法对粉体热分解过程,样品的物相,形貌和粒度分布进行表征.结果表明:在pH=13.2时制备的共沉淀粉,在750 ℃煅烧2 h后可获得单相层状的Ca_2Co_2O_5粉体,颗粒尺寸分布均匀,粒度在几百个纳米范围内. 关键词:共沉淀法; NaOH; Ca_2Co_2O_5粉体; coprecipitation methods; sodium hydroxide; Ca_2Co_2O_5 powders; [全文内容......
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Article ID: 1003-6326(2005)02-0443-04 Finite element method simulation of shotpeening wing skin panel WU Wei(吴 为), ZENG Yuan-song(曾元松), HUANG Xia(黄 遐), LI Zhi-qiang(李志强) (Beijing Aeronautical Manufacturing Technology Research Institute, Beijing , China) Abstract: Finite element method(FEM) was used to simulate the forming process of shotpeening the wing skin panel. Experiment......
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煅烧过程中出现了YAP相, 得到的粉体团聚严重, 烧结体密度很低. 关键词: YAG; 透明陶瓷; 纳米粉; 湿化学法 中图分类号: TQ174. 75 文献标识码: A Nanocrystalline YAG powders and translucent ceramics by wet-chemical method WEN Lei1, SUN Xu-dong2, QI Lu1... (AW) as the reagent and precipitants, respectively, the nanocrystalline yttrium aluminum garnet(YAG) powder was synthesized by the co-precipitation method. The precursor obtained through the AHC method......
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A new double reduction method for slope stability analysisBAI Bing(白冰), YUAN Wei(袁维), LI Xiao-chun(李小春)(State Key Laboratory of Geomechanics and Geotechnical Engineering(Institute of Rock and Soil Mechanics, Chinese Academy of Sciences), Wuhan 430071, China)Abstract:The core of strength reduction method (SRM) involves finding a critical strength curve that happens to make the slope globally fail......
PREPARATION OF MULTI-WALLED CARBON NANOTUBES USING NiO CATALYST SYNTHESIZED BY HYDROTHERMAL METHOD Y.J.Zhu1,X.M.Xue2,Y.L.Chen1,T.C.Kuang2,H.Y.Zhang3,S.H.Li1,Y.M.Chen3,C.Y.Wu1 (1.Department... NiO/SiO2 composite powder by hydrothermal method and desiccant method in open air respectively. Multiwalled carbon nanotubes (MWCNTs) were synthesized respectively by chemical vapor deposition using......