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technology for biological compatible porous magnesium materials were explored by the powder metallurgy method, and microstructures, porosity and mechanical properties of sintered porous magnesium were... pores. The overall porosity and porosity of open pore of the sintered porous magnesium increase with the increase of added spacer material, while decrease with the increase of the molding stress......
of porosity from 34.1% to 59.2% were produced by adding different amount of the pore-forming agent into initial silicon nitride powder. The microwave dielectric property of these ceramics at a frequency of 9.36 GHz was studied. The crystalline phases of the samples were determined by X-ray diffraction analysis. The influence of porosity on the dielectric properties was evaluated. The results show......
, Kunming University of Science and Technology, Kunming 650093) 摘要:The composition and structure of electroless tin coating were analyzed by SEM and X-ray diffraction. In the meantime, porosity, solderability and extensibility were determined by physical and chemical methods. The results showed that the porosity of the tin coating increases with the rise of bath temperature and decreases......
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properties of PM steels also affect the wear behavior. Porosity has differenteffects on the wear of PM steels depending on the application conditions. Under drysliding condition, higher porosity results..., but this relationshipchanges with the porosity and microstructures of PM steels.`` Key words:wear; PM steel; porosity; microstructure; hardness; [全文内容正在添加中] ......
flexural strength ((126.7±2.7) MPa) and high open porosity of 50.4% at elevated temperature (1200 °C). These results are attributed to the significant role of added Li2CO3 as sintering additive, where... demonstrate their great potential as a promising candidate for high temperature applications. Key words: sintering additive; flexural strength; porosity; glassy phase; Si3N4 porous ceramics Cite......
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at 900 °C for 9 min and firing at 1 230 °C for 15 min. The porosity and microstructures of fired pellets prove that the higher ratio of pyrite cinder is given, and the more holes and cracks are achieved...: pyrite cinder; desulfuration; compressive strength; porosity; microstructures 1 Introduction Pyrite cinder, as a subsidiary product of sulfuric acid production by roasting of pyrite ores, occupies much......
material through reaction sintering process, and the pore structures corresponding to the sintering temperature was also characterized. The results show that the porosity of porous NiAl intermetallic compounds during the preparation increases with the sintering temperature increasing. The porosity in the sintered body and the maximum pore size of porous NiAl are about 53% and 55 μm, respectively......
morphologies((a), (c), (e), (g)), and pore distributions((b), (d), (f), (h)) of MAO coated AZ31B Mg alloy 表1 MAO涂层表面孔的孔径分布及孔隙率 Table 1 Distribution and porosity of surface pore of MAO coated Mg... Table 2 Fitting parameters of Tafel curves of bare and MAO coated Mg alloys and porosity 2.2.2 交流阻抗谱 图4所示为镁合金及MAO涂层样品在3.5%NaCl溶液中的Nyquist图.显然,Nyquist图呈现出高频单容抗弧和低频感抗弧响应,可采用图5所示的等效电路描述.Rs为......
