Comments on the sliding wear of metals

The author reviews selected experimental results which have contributed to improved understanding of sliding wear processes. The emphasis is on the chemical and structural changes which occur at and near the surface of metallic materials during sliding in different environments. The importance of plastic deformation, fracture, transfer, mechanical mixing, phase transformations and oxidation is discussed. Examples of transitions are described, and interesting correlations noted. In selecting the content of this paper, the author includes controversial results and conclusions and raises questions about the development of wear equations, interpretations of the wear coefficient, the importance of adhesion, the roles of hardness, the causes of transitions and the location of debris-producing cracks.     

光导热塑记录系统在火药包覆质量激光全息无损检测中的应用

本文利用新型记录系统——光导热塑记录系统,代替了通常所采用的全息银盐干版,使激光全息无损检测摆脱了暗室,为以后装机,并使之应用于工厂实际检测奠定了基础;另外还总结了一条适合检测火药包覆质量的典型光路,获得清晰的全息条纹图案.     

《材料力学》课教学初探

本文综合论述了材料力学的课程体系和内在规律,从调动学生学习积极主动性角度出发,对材料力学的绪论讲授、教学思路的确立、类比法的采用、归纳总结及理论联系实际等五个方面进行探讨。     

Optimization of abrasive water jet cutting of ductile materials

Full factorial design of experiments was developed in order to investigate the effects of jet pressure, abrasive mixing rate, cutting feed, and plate thickness upon three response variables, surface finish of cutting wear zone, percentage proportion of striation free area, and maximum width of cut. The set of sixteen experiments was performed on each of the following two ductile materials: AISI 4340 (high strength low alloy steel, hardened to 49HRc) and Aluminum 2219. Analysis of Variance (ANOVA) was performed on experimental data in order to determine the significance of effects of different parameters on the performance measures. It was found that cutting feed and thickness were highly influential parameters, while abrasive mixing rate is influential upon surface roughness only. Strong interaction was found between jet pressure and workpiece material. Multi-criteria numerical optimization was performed in order to simultaneously maximize/minimize different combinations of performance measures.     

Cr12MoV钢冷挤压模具的热处理工艺

通过对冷挤压凸模的工作特点及失效分析，提出改善模具材料中碳化物的分布的方式及合理的热处理工艺，这是提高该模具使用寿命的关键措施．     

关于住宅坡屋顶的思考

对近几年各城市住宅建设中出现的坡屋顶热进行了分析,认为住宅设计中采用坡屋顶有其客观必然性和现实意义;⑴美化住宅造型,改善城市景观形象;⑵提高住宅屋顶的防水性能,增强住宅商品的耐久性;⑶有较好的保温隔热能力,利于建筑节能;⑷带动新型建材产业的发展。对住宅设计中采用坡屋顶形式、改善住宅整体功能和美化城市形象、实现人居环境的可持续发展等提出4点建议和意见。     

2号高炉进风面积的调节

叙述了武钢2号高炉针对原燃料条件变化进行进风面积的调整及调整效果，并对其原因进行了分析。     

Frequency-dependent dynamic effective properties of porous materials

The frequency-dependent dynamic effective properties (phase velocity, attenuation and elastic modulus) of porous materials are studied numerically. The coherent plane longitudinal and shear wave equations, which are obtained by averaging on the multiple scattering fields, are used to evaluate the frequency-dependent dynamic effective properties of a porous material. It is found that the prediction of the dynamic effective properties includes the size effects of voids which are not included in most prediction of the traditional static effective properties. The prediction of the dynamic effective elastic modulus at a relatively low frequency range is compared with that of the traditional static effective elastic modulus, and the dynamic effective elastic modulus is found to be very close to the Hashin-Shtrikman upper bound.     

正极材料LiNi1/3CO1/3Mn1/3O2包覆LiNi0.8Co0.15Al0.05O2的性能

以NiSO4·6H2O、CoSO4·7H2O、MnSO4·H2O、NH3·H2O及NaOH为原料,采用共沉淀方法在LiNi0.8 C00.15 Al0.05 (OH)2球形粒子表面包覆一层Ni1/3 Co1/3Mn1/3(OH)2三元材料前驱体,配锂后在750℃下、氧气气氛中焙烧12 h,合成复合层状材料Li[(Ni0.8 Co0.15Al0.05)0.97(Ni1/3Co1/3Mn1/3)0.03]O2.复合层状材料具有核壳结构,包覆壳层的厚度约为1μm.复合层状材料在2.8～4.3 V充放电,0.1C首次放电比容量为188.2 mAh/g;0.2 C循环100次的容量保持率为96.2％;在55℃下以0.2C循环100次,放电比容量保持在163.2 mAh/g.     

电弧作用下 AgMeO 触头材料的物理冶金过程分析

本文分析了ＡｇＭｅＯ触头材料电弧侵蚀机理,对电弧的热力作用下触头材料的各种响应从物理冶金本质角度进行全面研究,在此基础上对ＡｇＭｅＯ触头材料组元和组织的优化设计作了完整的分析讨论,提出优化设计判据,最后提出能充分表征触头材料电气使用性能的材料物理性能参数。