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加热扩散对电弧喷涂Al涂层的影响 被引量:4
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作者 李德元 唐勇 贾倩倩 《沈阳工业大学学报》 EI CAS 北大核心 2018年第5期498-504,共7页
为了提高Al涂层的抗高温氧化性及硬度,采用电弧喷涂方法在Q235碳钢基体上制备了Al涂层.结果表明,经过加热扩散处理后Al涂层和基体之间形成了扩散层.涂层厚度、加热温度与加热时间对扩散层具有一定影响.当加热温度为800℃和900℃时,Al涂... 为了提高Al涂层的抗高温氧化性及硬度,采用电弧喷涂方法在Q235碳钢基体上制备了Al涂层.结果表明,经过加热扩散处理后Al涂层和基体之间形成了扩散层.涂层厚度、加热温度与加热时间对扩散层具有一定影响.当加热温度为800℃和900℃时,Al涂层主要形成相为Fe Al、Fe Al2、Fe Al3和Fe2Al5.经过加热扩散处理后Al涂层具有优良的抗高温氧化性,且平均硬度相比未经加热扩散处理的Al涂层提高了10倍以上,利用扩散系数求出的扩散层深度与实际扩散层深度相近. 展开更多
关键词 FE-AL金属间化合物 电弧喷涂 加热扩散 扩散 抗高温氧化性 涂层硬度 Q235碳钢 扩散系数
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Variable mass and thermal properties in three-dimensional viscous flow: Application of Darcy law 被引量:4
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作者 Iffat JABEEN Muhammad FAROOQ Nazir A. MIR 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第5期1271-1282,共12页
This article concentrates on the properties of three-dimensional magneto-hydrodynamic flow of a viscous fluid saturated with Darcy porous medium deformed by a nonlinear variable thickened surface.Analysis of flow is d... This article concentrates on the properties of three-dimensional magneto-hydrodynamic flow of a viscous fluid saturated with Darcy porous medium deformed by a nonlinear variable thickened surface.Analysis of flow is disclosed in the neighborhood of stagnation point.Features of heat transport are characterized with Newtonian heating and variable thermal conductivity.Mass transport is carried out with first order chemical reaction and variable mass diffusivity.Resulting governing equations are transformed by implementation of appropriate transformations.Analytical convergent series solutions are computed via homotopic technique.Physical aspects of numerous parameters are discussed through graphical data.Drag force coefficient,Sherwood and Nusselt numbers are illustrated through graphs corresponding to various pertinent parameters.Graphical discussion reveals that conjugate and constructive chemical reaction parameters enhance the temperature and concentration distributions,respectively. 展开更多
关键词 Newtonian heating chemical reaction variable mass diffusivity Darcy law
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