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; 文献标志码:A Preparation of ultrafine structured Ti/TiC nanocomposite powders ZHENG Yi-feng, YAO Xun, LIANG Jia-miao, ZHANG De-liang (The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China) Abstract: The ultrafine structured Ti powder and Ti/TiC nanocomposite powders were prepared by high-energy ball milling and dehydrogenation......
174.758; O 614.3 文献标识码:A Synthesis and characteristics of Y-dope BaPrO3 ultrafine powders MENG Bo, TAN Xiao-yao, PANG Zhao-bao (College of Chemical Engineering and Technology, Shandong University of Technology, Zibo 255049, China) Abstract: BaPr0.9Y0.1O3-δ ultrafine powders with homogeneous composition were synthesized via low temperature combustion process......
Trans. Nonferrous Met. Soc. China 22(2012) 608-612 Effect of milling time on microstructure of Ti35Nb2.5Sn/10HA biocomposite fabricated by powder metallurgy and sintering WANG Xiao-peng1, 2, XU Li-juan1, 2, CHEN Yu-yong1, 2, KEE Do-Woo3, XIAO Shu-long1, 2, KONG Fan-tao1, 2, LIU Zhi-guang1, 2 1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; 2......
of ultrafine spinel LiMn2O4powders calcined at 550℃ for 12h 2.6 材料的电性能 按n(Li+)∶n(Mn2+)∶n柠檬酸为1.0∶2.0∶3.0得到前驱体,在550℃时焙烧12h,合成的尖晶石LiMn2O4粉末物相纯,粒径小,选择这种粉末做首次充,放电实验,其首次充,放电循环曲线如图7所示.可见,在充电和放电曲线上各出现2...采用固相配位法制备超细LiMn2O4正极材料 陈立宝1,2, 贺跃辉1, 汤义武3 (1. 中南大学 粉末冶金国家重点实验室,湖南 长沙, 410083; 2. 中国科学院 上海微系统与信息技术研究所,上海, 200050;3. 长沙力元新材料股份有限公司,湖南 长沙, 410100) 摘要: 采用固相配位反应法制备锂离子a电池正极材料LiMn2O4,并对配位络合剂用量和反应温度对最终产......
超细 (纳米级) 颗粒材料的制备 (二) 赵谢群1,邱向东1,胡初潜1,张燕红1 (1.北京有色金属研究总院,北京100088) 摘要:The development of preparation methods of ultrafine powder made from liquid, gas, solid and mixed state materials was reviewed. The industrialization status of some ultrafine powder was also described. 关键词:Ultrafine particulate materials; Powder; Preparation; [全文内容正在添加中] ......
Synthesis and Characterization of Gadolinium Doping M-type Hexagonal Barium Ferrite Ultrafine Powders 郭睿倩1,顾明元1,陈亚杰3,梁乐1,孙培梅4,金燕萍1,李洪桂4 (1.State Key Laboratory of MMCs, Shanghai Jiaotong University... ratio of citrate/nitrate (1~3) and calcination temperature of 850 ℃ for 1 h, M-type BaGdxFe12-xO19 ultrafine powders with a particle size of less than 100 nm can be obtained, and the coercive force......
键词:钨酸钠溶液；水热处理；焦绿石型三氧化钨；超细粉体 中图分类号:TF841.1 文献标志码:A Preparation of ultrafine pyrochlore-type tungsten trioxide powder by hydrothermal..., Changsha 410083, China) Abstract: The ultrafine pyrochlore-type tungsten trioxide powders were hydrothermally synthesized from sodium tungstate solution by adding pure WO3 powders to the reaction system......
文章编号:1004-0609(2010)S1-s1008-05 生物医用钛合金的微纳化加工技术及最新进展 于振涛1, 麻西群1, 余 森1, 张明华2, 韩建业1, 刘春潮1 (1. 西北有色金属研究院,西安 710016；2. 第四军医大学 附属唐都医院,西安 710038) 摘 要:介绍生物医用钛合金超细晶材料微纳化加工技术的主要方法,特点,其显微...’an 710016, China; 2. Tang Du Hospital, The Fourth Military Medical University, Xi’an 710016, China) Abstract: The research status of the main methods, characteristic, interaction of microstructure......
WC-Co复合粉的喷雾造粒及松装密度的影响因素王海滨1, 2,宋晓艳1, 2,刘雪梅1, 2,付 军1, 2,魏崇斌1, 2,高 杨1, 2(1. 北京工业大学 材料科学与工程学院,北京100124； 2. 北京工业大学 教育部新型功能材料重点实验室,北京100124)摘 要:利用短流程原位反应合成技术制备超细WC-Co复合粉,其平均粒径为300 nm,对此复合粉进行喷雾造粒以制备具有超细结构的热喷涂粉末.采用标准漏斗法测量造粒粉末的松装密度,并利用SEM观察其形貌与结构,结合实验测定结果与理论计算结果研究料浆成分,喷雾干燥温度及初始粉末粒径对造粒粉末松装密度的影响规律.结果表明:料浆固含量最高可达70%(质量分数),此时造粒粉末松装密度达到2.31 g/cm3；随粘结剂含量的增高,造粒粉末松装密度先增高后降低,最佳含量为2.5%(质量分数)；分散剂最佳含量为1%~2%(质量分数......
的振动频率与弹条第1和第2阶固有频率相近,容易引发共振现象导致弹条断裂. 表6 弹条前4阶固有频率及振型描述 Table 6 Natural frequency and description of the first four vibration modes of elastic bar 4.2 谐响应分析 弹条在列车动荷载作用下,由于轨道不平顺的激励作用,在特定条件下会达到某个频率的共振,使...为钢轨波磨的通过频率,与弹条自由状态下的第1和第2阶模态的固有频率相近,表明DTⅥ2型扣件弹条的固有频率与典型钢轨波磨的通过频率接近,因此,在典型钢轨波磨的激励下,弹条易产生共振,从而增大弹条的振动幅值,加速弹条的疲劳损坏,造成弹条突然断裂.其中,弹条小圆弧内侧和跟端最大等效应力明显大于大圆弧拱顶和趾端最大等效应力,并且已经远远超过弹条的屈服强度,使弹条产生塑性变形,且该处是弹条断裂常发生的位置......
