电泳沉积固体氧化物燃料电池关键参数研究综述（英文）

目的:电泳沉积是一种简单且具有成本效益的涂层技术。其出色的形态特征控制,适用于制造需要每个组件层都具有其独特属性的固体氧化物燃料电池。本文旨在综述电泳沉积的最新进展、制备稳定悬浮液所需的关键因素以及通过电泳沉积技术制造固体氧化物燃料电池所涉及的相关参数。创新点:1.分析了维持悬浮液稳定性的关键参数,包括粒径和固体载荷等胶体相关参数以及介电常数和电导率等悬浮介质相关参数。2.讨论了这些参数对粒子流动性、电动电位和电泳沉积技术于固体氧化物燃料电池应用的综合效应。方法:1.对以往的研究进行综述,并总结电泳沉积技术制造固体氧化物燃料电池组件层的发展(表1),包括稳定悬浮液的制备以及电泳沉积工艺关键参数的优化。结论:鉴于每个固体氧化物燃料电池组件层都涉及不同类型的材料,且每种材料都需要特定的参数来实现有效沉积,因此,为了获得各组件层所需要的性能,制备悬浮液配方的正确性和电泳沉积工艺的优化显得至关重要。

Stress intensity factors under combined bending and torsion moments

This paper discusses stress intensity factor (SIF) calculations for surface cracks in round bars subjected to combined torsion and bending loadings. Different crack aspect ratios, a/b, ranging from 0.0 to 1.2 and relative crack depths, a/D, ranging from 0.1 to 0.6 were considered. Since the loading was non-symmetrical for torsion loadings, a whole finite element model was constructed. Then, the individual and combined bending and torsion loadings were remotely applied to the model. The equivalent SIF method, F*EQ, was then used explicitly to combine the individual SIFs from the bending and torsion loadings. A comparison was then carried out with the combined SIF, F*FE, obtained using the finite element analysis (FEA) under similar loadings. It was found that the equivalent SIF method successfully predicted the combined SIF for Mode I. However, discrepancies between the results determined from the different approaches occurred when FIII was involved. It was also noted that the predicted F*FE using FEA was higher than the F*EQ predicted through the equivalent SIF method due to the difference in crack face interactions.

Wear behavior of copper-containing ferritic iron under a dry sliding condition

The effect of solute Cu and Cu precipitates on the wear behavior of ferritic iron under an unlubricated condition was investigated.The specific wear rate of Cu-containing steel abruptly decreased up to 50 N of load,and then gradually decreased with further increased load.The specific wear rate of the as-quenched specimen,in which Cu was in a solid solution,was the lowest among all the specimens at low loads,and all specimens had almost the same specific wear rate at high loads.Subsurface observation showed that the hardness increments of all specimens decreased with increased depth below the worn surface.The as-quenched specimen had a relatively large depth of deformed region than the other specimens even though the increments in hardness were almost the same for all specimens at low loads.With the same hardness at an unworn state,the as-quenched and over-aged specimens exhibited a substantial increase in hardness and large deformed regions below the worn surfaces.This finding indicated that the enhancement in plastic deformation and work hardening led to the decrease in the specific wear rate of the as-quenched specimen at low loads and the improvement in the wear resistance of all specimens at high loads.