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Mechanism of Action of Rare Earths in High Effective Fe Powder Welding Rods Li Jianguo1,Liu Yan1,Han Yongquan1,Huang Lihong1,Yao Qinghu1 (1.College of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China) Abstract:The optimum coating composition of alkali Fe powder welding rods was designed by orthogonal experiment with mix rates. A new kind......
, Sw represents the measured surface area of the powder, ρ is the average theoretical density of the Fe core and carbon shell (the particle diameter of the Fe core is 18 nm and the thickness of carbon...显的核-壳结构,内核金属为体心立方结构的铁,外壳为无定形碳.颗粒大多呈球形和椭球形,粒径分布在15~40 nm范围内,平均粒径为30 nm,内核粒径为18 nm,外层碳的厚度为6~8 nm,比表面积为24 m2/g. 关键词:碳包覆;Fe纳米颗粒;约束弧等离子体 (Edited by YANG Hua) Foundation item: Project (208151) supported......
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用于分析热处理后Fe纳米薄膜的微观结构. 2 结果与讨论 在纳米薄膜的制备过程中, 原子(离子)的沉积角度直接影响薄膜的颗粒大小, 形状和分布状态等相关的微观结构. 因此本文作者对不同角度沉积的Fe纳米薄膜的微观结构进行了原子力显微分析. 图2所示为不同沉积角度下获得的厚度为5nm的Fe纳米薄膜的结构. 从图2中可看出, 当离子沉积角为90°时, 纳米铁薄膜为高低起伏的较大颗粒团簇... Particles statistical analysis results of Fe nano-films deposited by different angles 由此可见, 在MEVVA磁过滤等离子沉积制备金属铁纳米薄膜的过程中, 不同离子束沉积角度对厚度仅为几个纳米的薄膜结构具有很大的影响. 这种对微观结构的影响主要源于不同沉积角度引起的原子扩......
of Metallurgical Science and Engineering, Central South University, Changsha 410083, China Received 22 March 2012; accepted 8 November 2012 Abstract: A novel technology using Fe powder as reducing agent..., the dosage of reducing Fe powder 4 g/L, agitation speed 600 r/min and temperature 80 °C. Under these experimental conditions, the recovery ratios of Ge and Cu from precipitating vitriol supernatant in Zn......
文章编号:1004-0609(2009)07-1224-06 预合金粉对粉末冶金NiFe18.5Al25合金性能的影响 崔建民1,卢 静2,袁 勇1,陈春辉2,罗丰华1, 2 (1. 莱芜钢铁集团粉末冶金有限公司,莱芜 271105; 2. 中南大学 粉末冶金国家重点实验室,长沙 410083) 摘 要:将元素Ni,Fe和Al粉以摩尔比56.5...态抗拉强度可达到868 MPa,说明元素粉末中添加的预合金粉可以控制烧结过程,提高合金的烧结密度,同时增强合金的力学性能. 关键词:Ni-Fe-Al合金;机械合金化;粉末冶金 中图分类号:TG 113.25;TF 124 文献标识码:A Influence of prealloyed powder on properties......
, respectively, and finally dried at 80 °C for 20 h to obtain Fe-doped BiVO4. 2.2 Characterization X-ray diffraction ( XRD ) analysis was conducted on a Rigaku D/Max 2500 powder diffractometer with  ...:以Bi(NO3)3,Na3VO4和Fe(NO3)3为原料,以十二烷基苯环酸钠为结构导向剂,采用水热法制备了铁掺杂BiVO4.利用XRD,SEM,TEM,HRTEM以及紫外-可见漫反射光谱(UV-Vis)对样品进行结构,形貌及光吸收性能分析.结果表明:铁掺杂BiVO4具有由纳米片组装而成的多层级花状结构.SDBS在BiVO4(100)晶面的选择性吸附是花状结构形成的关键原因.适量铁离子进入......
结合能(E=711.5 eV)可知,腐蚀产物膜中Fe元素以水合氧化铁FeO·OH的形式存在.CuNi10FeMn1合金在海水冲刷腐蚀初期,由于合金存在成分偏析,不同部位存在成分浓度差异,在局部位置形成微电池.在微电池阳极上,Cu,Ni,Fe等逐渐溶解形成阳离子,进一步发生氧化,水解等反应形成氧化物膜附着在合金表面,对氯离子,氧等腐蚀介质接触合金表面具有阻碍作用,阻碍了合金进一步腐蚀[6],主要化学...; (6) 在海水冲刷腐蚀条件下,添加Fe元素能使CuNi10FeMn1合金表面形成的Cu2O膜上附着一层致密的水合氧化铁膜[6].一方面能对氯离子,氧等腐蚀介质接触合金表面起阻......
,包头 014030; 3. 内蒙古第一机械集团股份有限公司 第五分公司,包头 014032 摘 要:为了提高TiAl-Nb合金的力学性能并优化合金成分,熔炼制备不同含Fe量(0, 0.3, 0.5, 0.7, 0.9和1.1, 摩尔分数,%)Ti46Al5Nb0.1B合金试样,系统研究合金的宏观/显微组织及压缩力学性能.结果表明,Fe元素能细化晶粒,加重枝晶间的铝偏析并在枝晶间形成富铁B2相.室温...Trans. Nonferrous Met. Soc. China 30(2020) 1315-1324 Improvement of microstructure and mechanical properties of TiAl-Nb alloy by adding Fe element Yong YANG1,2, He-ping FENG3, Qi WANG1, Rui-run CHEN1......
J. Cent. South Univ. (2020) 27: 1611-1623 DOI: https://doi.org/10.1007/s11771-020-4394-y New development of powder metallurgy in automotive industry TAN Zhao-qiang(谭兆强)1, 2, ZHANG Qing(张青)2, GUO Xue-yi(郭学益)3, ZHAO Wei-jiang(赵伟江)1, ZHOU Cheng-shang(周承商)1, LIU Yong(刘咏)1 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Hoganas (China) Co., Ltd......