共搜索到1070条信息，每页显示10条信息，共107页。用时：0小时0分1秒258毫秒
of surface scale using acid dipping, mechanical polishing to get a smooth surface, degreasing with trichloroethylene and final electro cleaning at 4 A/dm2 in a solution of sodium hydroxide... that the solution is stable for 15 h, which thereafter undergoes chemical reaction and shows a decrease in peak intensity from 1.8 to 0.2 over a period of 8 d due to consumption of Cu ions. Cyclic......
), which used a 15 J hammer to measure the total absorbed energy. Hardness was measured using a Vicker’s hardness machine (Matsuzawa DVK-2) at an applied load of 5 N. Table 1 Chemical compositions... to a final polishing with colloidal silica suspension. To examine the 3D morphology of eutectic silicon, the samples were deeply etched with a solution of 20% HCl acid and 80% ethanol for 4 h......
equation (multilevel series rules). 2 Experimental 2.1 Material and procedures The nominal chemical composition of 1060 pure aluminum used in this experiment is shown in Table 1. The compression..., two flat ends of the test specimen in the process were painted with a layer of nickel-based lubricant, and sticked on a piece of graphite foil with 0.0254 mm in thickness. Table 1 Chemical composition......
of 100 μm. Eventually, a disc 3 mm in diameter was punched from each slice for twin-jet electro polishing and thinning process at the room temperature. 4 Results and discussion 4.1 Microstructural......
to efficiently improve the mechanical and chemical properties of the fusion-welded joint by relieving the residual stresses and modifying the microstructure in the heat treatable alloys such as aluminum... the chemical compositions of the parent alloy and filler metal. The two plates were fabricated in butt joint design double-V with bevel angle of 80° and dimensions of 300 mm × 150 mm × 10 mm......
, and in addition yields exceptional mechanical, thermal and electrical properties [1]. Welding of these materials is challenging because of difference in its melting temperature, chemical compositions... action, r1 is the radius of shoulder, r2 is the dynamic radius of pin. Table 2 Chemical compositions of base materials (mass fraction, %) Table 3 Tool designs and process parameters to be continued......
, 15.1% and HV 135, respectively. Fig. 1 Electron dispersive X-ray (EDAX) analysis showing chemical composition of base metal The 5 mm thick extruded sheets were cut in plates of 300 mm in length and 50... techniques which include mounting, polishing and etching. Polished samples were etched for 90 s in Keller’s reagent (2 mL nitric acid, 4 mL hydrofluoric acid and 94 mL water) for macrostructural......
analysis [J]. Optical & Laser Technology, 2009, 41(5): 634-642. [41] HO C Y, LIN Z C. Analysis and application of grey relation and ANOVA in chemical–mechanical polishing process parameters [J... contamination and heated using an induction electrical furnace. The hollow fly ash particles were collected from NTPC Thermal Power Station, Farakka, India. The chemical compositions of AA6061 alloys......
transfer under the present neutral conditions. Some similar results with only one pair of relatively weak redox peaks have been reported in the literature [1,2,12]. The electro- chemical behavior... YANG1, Yan-fang HUANG1, Jing YANG2, Wen-cui CHAI1, Rui ZHANG2, De-liang CHEN2 1. School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, China; 2. School of Materials......
of Automation Research and Development Platform, China there are some new materials used to develop a new type of driver as the progress of material technology, such as, memory alloy [10], electro rheological... In the service occasions of human-robot physical contact, or in the industry occasions of cutting, polishing and so on, robots are usually required to have greater safety compliance. Impedance control......
