多元羧酸防皱机理的探讨

多元羧酸的防皱机理是近期织物防皱整理研究讨论的热点。其中，催化剂在体系中所起的作用现有多种说法，如催化成酐，催化成酯，以及既催化成酐又催化成酯和其他一些观点。本文就多元羧酸的防皱机理作一分析和归纳，并提出一些看法。     

晶须取向对SiCw／Al复合材料切削表面质量的影响

切削与晶须取向方向间的夹角对ＳｉＣｗ／Ａｌ复合材料切削表面质量有很大影响。当切削角为４５°时，晶须拔出和转动现象均较少，复合材料切削表面粗糙度最低。当切削角为１３５度时，晶段转动造成的撕裂破坏程度很大，复合材料切削表面粗糙度最大。     

Effect of Cu concentration on the reactions between Sn-Ag-Cu solders and Ni

The reaction between the Sn-Ag-Cu solders and Ni at 250°C for 10 min and 25 h was studied. Nine different Sn-Ag-Cu solders, with the Ag concentration fixed at 3.9 wt.% and Cu concentrations varied between 0.0–3.0 wt.%, were used. When the reaction time was 10 min, the reactions strongly depended on the Cu concentration. At low-Cu concentrations (≦0.2 wt.%), only a continuous (Ni_1−xCu_x)₃Sn₄ layer formed at the interface. When the Cu concentration increased to 0.4 wt.%, a continuous (Ni_1−xCu_x)₃Sn₄ layer and a small amount of discontinuous (Cu_1−yNi_y)₆Sn₅ particles formed at the interface. When the Cu concentration increased to 0.5 wt.%, the amount of (Cu_1−yNi_y)₆Sn₅ increased and (Cu_1−yNi₆)₆Sn₅ became a continuous layer. Beneath this (Cu_1−yNi_y)₆Sn₅ layer was a very thin but continuous layer of (Ni_1−xCu_x)₃Sn₄. At higher Cu concentrations (0.6–3.0 wt.%), (Ni_1−xCu_x)₃Sn₄ disappeared, and only (Cu_1−yNi_y)₆Sn₅ was present. The reactions at 25 h also depended strongly on the Cu concentration, proving that the strong concentration dependence was not a transient phenomenon limited to a short reaction time. The findings of this study were rationalized using the Cu-Ni-Sn isotherm. This study shows that precise control over the Cu concentration in solders is needed to produce consistent results.     

清水混凝土施工工艺

介绍了由于节约资源,具有独特的自然美等优点,清水饰面混凝土在国内外得到了越来越广泛运用的情况,探讨了清水饰面混凝土所具备的技术特点,和在工程实施的过程中对模板工程、混凝土工程在工艺方面的基本要求。     

Surface integrity when machining age hardened Inconel 718 with coated carbide cutting tools

Considerable attention has been given to the use of ceramic cutting tools for improving productivity in the machining of heat resistant super alloys (HRSA). However, because of their negative influence on the surface integrity, ceramic tools are generally avoided particularly for finishing applications. As a result the main high end manufacturers are more or less dependent on carbide cutting tools for finishing operations. Still the improper use of carbide cutting tools can also result in poor surface integrity. The objective of this investigation is to develop a set of guidelines, which will assist the selection of the appropriate cutting tools and conditions for generating favorable compressive residual stresses. This paper specifically deals with residual stresses and surface finish components of surface integrity when machining (facing) age hardened Inconel 718 using two grades of coated carbide cutting tools specifically developed for machining HRSAs. The cutting conditions were obtained from investigations based on optimum tool performance. The effect of insert shape, cutting edge preparation, type and nose radius on both residual stresses and surface finish was studied at this optimum cutting condition. This investigation, suggested that coated carbide cutting tool inserts of round shape, chamfered cutting edge preparation, negative type and small nose radius (0.8 mm) and coolant will generate primarily compressive residual stresses.     

放电电流对电火花线切割精加工表面粗糙度的影响规律研究

电火花线切割精加工的表面粗糙度是衡量加工性能的重要指标之一。在加工过程中，表面粗糙度会受到放电电流的影响，其中包括放电电流能量、电流脉宽及电流极性的影响。通过在低速走丝电火花线切割机上进行多次加工实验，研究分析了放电电流对线切割精加工表面粗糙度的影响规律。     

二甲基硅油及其表面活性剂在化纤生产中的应用

综述了二甲基硅油及其表面活性剂在化纤油剂中的应用 ,化纤油剂应具有的高平滑性、高耐热等特性 ;介绍了改善油剂的综合性能及硅油表面活性剂用来提高纤维的可纺性等性能的方法。建议我国应尽快开发研制含硅油的化纤油剂     

浅谈涤纶全拉伸丝油剂

介绍了涤纶全拉伸丝(FDY)工艺对纺丝油剂的要求,概括了国内外涤纶FDY纺丝油剂的研究状况,就油剂用表面活性剂原料的选择、油剂的配制、油剂配方设计以及油剂使用过程中应注意的一些问题进行了阐述。     

FDY油剂的润湿性及其对纺丝加工性能的影响

介绍了 FDY油剂润湿性的意义及其在纺丝加工过程中的作用。讨论了润湿性对加工纤维的摩擦系数、抗静电性、强伸度的均匀性及可纺性的影响程度     

化纤油剂用表面活性剂单体的性能及应用

介绍了用作化纤油剂平滑剂、抗静电剂、乳化剂的磷酸酯、硫酸酯、脂肪酸酯、聚醚等表面活性剂单体的结构特点与性能 ,指出了应加速我国化纤油剂用表面活性剂单体的优化开发。