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, which is ceramic particle in solution, was used as tool thermal protector agent to limit thermal exchanges with the extrusion tool and to limit aluminium chemical attack. Fig.4 Schematic diagram... thermal protector on surface quality of thixoforged parts Tool thermal protector coating is important to avoid chemical attack on tool steel and galling as shown in Fig.14. Fig.14 Galling of thin wall......
], polishing agents [3,4], photonic and electronic devices [5-7], gas sensing [8] and solid oxide fuel cells (SOFC) [9,10]. Many metallic and non-metallic elements have been tried, in the past... microscopy (TEM) and energy- dispersive spectrometry (EDS) were taken for morphology and chemical composition by JEOL JEM-2010 transmission electron microscope, which was operated at 200 kV. The textural......
cross section, stability in corrosive solutions [6] and good electrical conductivity (2×107 S/m) of its microparticles [7]. The desirable chemical and thermal stability of B4C is due to its covalent...×30 mm× 100 mm was cut and its surface was polished with a polishing machine to remove grease and surface oxide. The sample was washed with nitric acid, alcohol and distilled water to prepare......
of 25 kV. Thin sheets for transmission electron microscope (TEM) observation were cut parallel to impact direction, followed by mechanical polishing to a thickness about 50 mm. Final thinning to electron transparency was achieved by double jet polishing in a solution of 10 mL nitric acid +45 mL n-butanol + 45 mL methanol. The polishing voltage was kept constant at 30 V and the temperature......
to the matrix. It is obvious from Table 2 and Fig. 1 that copper exists in the surface microstructure as well as in the bulk microstructure of the alloy. Alkaline cleaning, chemical polishing... alkaline cleaning, which may be metal oxides or hydroxides, such as silicon dust and copper dust. The smuts were completely removed during chemical polishing. After chemical polishing, a thin layer......
were widely investigated [15-17]. In last several decades, many explanations have been proposed to describe the ISE, including the presence of oxides or chemical contamination near the surfaces [18... process and the average value was used to plot the load-depth (p-h) curves and to calculate the indentation hardness. It should be noted that the W surface obtained through mechanical polishing is rather......
(by dissolving copper containing particles) during anodising process, the surface of the alloy should be depleted from copper/copper-containing phases. Alkaline cleaning, chemical polishing and deoxidizing... was covered with black smuts which may be metal oxides or hydroxides such as silicon and copper dust. The smuts were completely removed during chemical polishing. After chemical polishing, it was seen......
-mediated synthesis of Li4Ti5O12 nanoparticle and its electro-chemical properties[J]. Electrochemistry Communications, 2004, 34(6): 1093?1097. [7] Kiyoshi N, Ryosuke N, Tomoko A, Hiroshi M. Preparation......
with HNO3 at different temperatures on silver adsorption LIU Wen-hong1, YUAN Huai-bo2, L? Jian-ping1 (1. College of Chemical Engineering, Hefei University of Technology, Hefei 230009, China; 2... supporting silver [J]. Carbon, 1998, 36(11): 1567-1571. [3] Kumar V S, Nagaraja B M, Shashikala V, Padmasri A H, Madhavendra S S, Raju B D, Rao K S R. Highly efficient Ag/C catalyst prepared by electro......
the bacterial and ferric sulphate leaching of zinc sulphide[J]. Hydrometallurgy, 2004. 73(2): 313-324. [15] 田昭武. 电化学研究方法[M]. 北京: 科学出版社, 1984: 240-246.TIAN Shao-wu. Electro-chemical study technique[M]. Beijing...; 文献标识码:A Electro-generative mechanism for simultaneous leaching of chalcopyrite-MnO2 in presence of Acidithiobacillus thiooxidans XIAO Li1, 3, QIU Guan-zhou2, FANG Zheng1 (1......
