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are deposited in the reactor scale from -100 mm to -230 mm.Key words:ZrC coating; low pressure chemical vapor deposition; phase composition; microstructure; homogeneity......
lateral extrusion; hardness homogeneity 1 Introduction Production of ultra-fine and nano-structured materials by means of severe plastic deformation (SPD) techniques has attracted many researchers... in the present work and detailed information on the levels of hardness and the degrees of homogeneity on three orthogonal planes has been achieved. In the present research work, DECLE process was applied......
technique; grain refinement; hardness distribution homogeneity 1 Introduction Aluminum and its alloys are among the interesting industrial materials due to their specific properties such as low density... that the initial aluminum sample has the hardness of HV 42.2 with the high-level hardness distribution homogeneity of 1.395. Imposing one pass CGP process on the aluminum sample leads to the considerable hardness......
(1) (2) 式中:tmax为散热器台面上热源区域的最高温度,℃；tin为散热器进风口的空气温度,℃；tmin为散热器台面上器件安装区域的最低温度,℃. 图1 散热器及功率器件外观结构 Fig. 1 Appearance structure of air-cooling heatsink and power device 图2 波纹翅片结构 Fig. 2 Structure of wavy fin 为降低台面温升和提升均温性,一方面,可以增加散热器翅片的换热面积,如在散热片上增加凸起结构,如图2所示的波纹状凸起；或者增加散热片数量,但由Biot数的定义及强制对流换热的特性可知,对于等截面......
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simulations were carried out to investigate the load-displacement behavior, the plastic deformation characteristics and the effective plastic strain homogeneity of Al-1080 deformed by different forming... workpiece has a higher degree of deformation homogeneity than the other deformation processes. The microhardness values were calculated based on the average effective plastic strain. The predicted......
in practical application. Key words: electromagnetic flowmeter; magnetic field homogeneity; optimization of excitation coil; magnetic field intensity; weighting function 电磁流量计是工业过程参数测量中广泛应用的一种流量仪表,具有结构简单,流......
rolling; homogeneity; microstructure; properties 随着飞机设计理念的创新,航空制造业对铝合金的要求经历了从第一代高静强度到第四代高强度,高韧度和耐腐蚀等综合性能的改变[1-2].新一代铝合金对其规格提出了严格要求,使高性能铝合金向高强度,高韧度,低淬火敏感性发展[3].使用铝合金超厚板制作大型结构件,摒弃如焊接或铆接的传统成型方式,既可使结构质量减小......
properties of the samples were compared under these two methods and assessed by XRD,Raman,BET,TEM,H2 TPR,OSC,XPS and catalysts measurements. The formation of homogeneity phase structure can be facilitated by changing the precipitating properties of Ce3+ under oxidation coprecipitation method, which is helpful to enhance the homogeneity of Ce and Zr at atomic level.What’s more, it is conducive......
properties of the samples were compared under these two methods and assessed by XRD,Raman,BET,TEM,H2 TPR,OSC,XPS and catalysts measurements. The formation of homogeneity phase structure can be facilitated by changing the precipitating properties of Ce3+ under oxidation coprecipitation method, which is helpful to enhance the homogeneity of Ce and Zr at atomic level.What’s more, it is conducive......
