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 Wysłany: Pon 18:00, 10 Sty 2011 Temat postu: ugg stivali Zinc-based alloy crystalline silicon, |
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Zinc-based alloy / crystalline silicon,ugg stivali, ceramic particles flow technology of composite materials
Eight in Canada through the atmosphere to change the nature of the melt before the heat treatment to improve absorption of the gas particles in the surface of the solid precipitation but also because the outermost surface of the nature and arrangement of atoms are hi affected. Know from the previous experiment,Moncler jacken, when the particle preheating temperature over the melting point of the substrate,ugg italia, the particle yield of education is low,moncler daunenjacke, and when the preheating temperature is too low pair,air jordans, particle recovery rate is also low. There is therefore a critical preheat temperature literature: A critical preheating temperature expression: one by one (3) where - the matrix melt; - Lang state when the metal density and latent heat; f - the packing density of particles - the critical ratio of D l for a particle in the liquid T, the density and heat capacity of preheating temperature to: <<range better. 3.3 Other claims on the particle due to the recovery rate of stirring speed on particle recovery rate of the video, ah, is obvious. Stirring speed increased the recovery rate of particles increased when the speed is too high, easy to stir people to form gas pores. However, there is no fast after remelting casting porosity. If the slurry directly to the casting, it may leave holes in the casting. In this case. Stirring speed should not be too high. Stirring time on the recovery rate of particles. Figure 2 shows, the recovery rate in the higher levels of particles. After the solid particles increases, stir shaking a short time, the metal particles while mixing people, but to scatter it is not low levels of particles. Level, when you hear longer. Particles dispersed in the matrix, but this time some particles may adhere with the fluid motion in the crucible wall. At. Level, the crucible wall particles and sent back into bad A semi-solid slurry, it is evenly distributed and that content; from the Anglo-phase organization found, stirring for a long time, the angular silicon particles significantly smaller. Cylindrical and spherical, which is solidified from the zinc Taijin fold in the silicon phase are significant differences between Cong. Taijin solidified his zinc Taijin precipitation of silicon phase is more angular, and deposited large size, uneven distribution. Of course, the proportion of particles and the substrate Lin, particle shape and the recovery rate of the particles are too small will be affected. Further study in this area 4 conclusion a. Zinc base / silicon, silicon carbide, alumina particle composites were prepared using a simple flow. Particles without coating, directly into, by a certain time of stirring, the particles can be fully wetting can also quickly poured into the metal mold and remelted to obtain castings of complex shape. b. Flow process can be obtained with particles of high zinc content of roots-based Taijin composite materials, reflow material can be poured castings Recovering depression. Stirring speed should be appropriate not just been re-baked in the composite ingot porosity; c particles should be preheated, the preheating temperature below the melting point, higher than the preheating temperature of preheating the critical particle and the matrix can improve the wettability to improve the particles collected Gu. d. Flow process by adding to the zinc-based alloys and alloys of silicon particles in the solidification of the zinc precipitation of silicon compared to small size, distribution, morphology improved. References iMehr ~ NaaR. · & MA. andF [emingsM-c% cC ~ gosJs0FAI. Alloys. TMsAIME, W duh k · PA, 1975t172 Chen Fu Quan. Zinc and zinc alloy die stack of superplastic forming technology platform. Han Harbin: Hall Book University Press. ] 985:83 LeviC. G. . A ~ schJanG. Jandmahra ~ anR. inRh ~. . ast-n8McICColumbus, 0H. 1978】 4Morten ~ nA. Cc ~ 'nieJA-andFlenaln ~ M. CSolidifi ~. ationProcessingofM ~ talMatrixComposites. J. morals】 9884O (2): 2jNaGataS. eta1. PrccedirlSsSummaryof89thAnunalM. enP God sylvaniaAFSIAFS. 1985d9 ~ 5 (Editors: Jose Education) meeting emergency consumption of aluminum and aluminum-silicon alloy refining, modification Conference will be held in July made the National Institute of Special Casting Xia Youyi zinc dust together professional committee decided to dry in early July 1993 in Jiangsu Province Zhang Jian held port city of Al-Si alloy of aluminum and refining, modification Conference, welcomed the dust in aluminum casting station workers would like to attend the meeting to take part please send a letter casting Imperial College Department of Harbin Institute of Technology, special cast and colored contact the Commission, Zip] 50006. It was also arranged small-scale trade shows, fairs, information exchange, mandarin duck, Singapore welcomed excited about aluminum casting production of the flux of gold, set hi, equipment and raw materials plant to participate, willing to participate in the editorial department, please and Comrade Chen Wei-chen Union Gao made the National Foundry Association and a special zinc Yi Fen Gold Committee of 7. L ■} ■ I-■ r.
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