共搜索到2527条信息，每页显示10条信息，共253页。用时：0小时0分0秒773毫秒
coating thickness on casting imperfection and porosity percentage as well as eutectic silicon spacing of the alloy. The results showed that increasing slurry viscosity and flask dipping time influenced... porosity. Key words: aluminum alloy; lost foam casting; coating thickness; slurry viscosity; dipping time; porosity 1 Introduction Lost foam casting (LFC) as a cost-effective and environmentally......
......
casting was investigated based on industrial experiments. The results show that the solidification structure of austenitic stainless steel can be remarkably refined, the central porosity and shrinkage... that of molten carbon steel in the same magnetic flux density. Key words: horizontal continuous casting; austenitic stainless steel; electromagnetic stirring; equiaxed grains; central porosity......
......
, phase composition and corrosion resistance of the micro-arc oxidation (MAO) coatings treated with silicate aqueous solution on the AZ91D magnesium alloys were studied. The surface porosity and surface... while the duty ratio plays a weak role. The thickness, surface porosity and corrosion resistance of coatings increase accordingly with enhancing voltage, but the frequency and duty ratio have certain......
:P624.6 文献标志码:A 文章编号:1672-7207(2014)09-3200-11 Diagenesis and porosity evolution..., with which the study of buried history was combined and applied to the restoration of process of porosity evolution. The results show that the reservoir sandstones from the 8th member of Yanchang formation......
......
) and pressures (13-812 MPa) in a hydrothermal diamond anvil cell (HDAC) reveals the preservation mechanism of porosity in deep carbonate reservoirs in the northeastern Sichuan Basin. The carbonate... and burial dissolution may not be the dominant diagenesis in the origin of porosity. Thin section photomicrographs observations in Changxing and Feixianguan Formations demonstrate that eogenetic pores......
......
℃时含油率达到最大值,为30.5%.此后随烧结温度的提升,轴承密度迅速提升,导致开孔率线性下降,850 ℃和900 ℃时相应的开孔率分别为26.0%和20.8%. 图7 不同烧结温度制备弥散铜-锡含油轴承的密度和开孔率 Fig. 7 Density and open porosity of ODS copper-tin oil bearings sintered... to 850 ℃, metallurgical bonding is widely observed between powder particles, which remarkably improves the strength and slightly decreases the open porosity of the bearings. Once the sintering......
