聚乙二醇改性环氧树脂浸渗液的研究

本文开展了低聚合度聚乙二醇对环氧树脂浸渗液的改性研究。对浸渗液的配方和工艺进行了试验,并探讨了浸渗动力学。

Al_2TiO_5/Al_2O_3复合材料的抗铝液浸渗性能分析

钛酸铝系复合材料中钛酸铝的体积分数不同,会导致Al2TiO5/Al2O3复合材料的抗铝液浸渗性能的不同。在Al2TiO5中分别按10%、20%、40%、60%、80%、90%(体积分数)引入Al2O3进行复合。通过对渗铝试样的外观形貌、微观结构分析,进而对其铝液浸渗性能进行了分析比较,发现富钛酸铝的钛酸铝/氧化铝复合材料(φ(Al2TiO5)>40%)抗铝液浸渗性能好;而富氧化铝的钛酸铝/氧化铝复合材料(φ(Al2TiO5)<20%)有金属铝液沿热震产生的裂纹渗入复合材料内部,容易导致复合材料断裂失效。该研究结果对可靠应用钛酸铝系复合材料作为铝液的容器具有实际工程应用价值。

汽车动力传动系统铸件的浸渗技术

2004年2月26日,英国汽车零部件厂商协会(SMMT)在上海举办“汽车动力传动系统”研讨会。会上英国Ultraseal国际公司专门介绍了汽车动力传动系统铸件的浸渗技术,对我国汽车发动机缸体、缸盖等铸件生产企业具有一定的帮助。 Ultraseal国际公司从事铸件浸渗技术已有30多年历史,为所有处理气孔的行业提供独特的专业服务,能解决铸件内普遍存在的气孔。

浸渗技术及其应用

本文简要介绍了浸渗技术的原理、方法、用途以及有关浸渗剂的技术性能;并结合几年来的生产实践,应用浸渗技术的生产工艺及影响因素和解决措施,作了阐述。

铸件浸渗工艺研究

铸件在铸造过程中内部存在着疏松，气孔等缺陷，本文介绍一种流体通过渗入铸件微固化后达到密封表面，提高铸件表面质量的工艺。

压缩机缸体渗漏的修补

本文总结了压缩机缸体渗漏修补的实验室工作和生产实践性试验,试用了以低粘度无机或有机粘结剂用真空加压浸渗法进行修补的方法。文中叙述了工艺条件、生产流程,并对两种不同的浸渗液进行了比较,为缸体铸造缺陷和运行中发生渗漏的旧缸的修复提供了一种途径。

Retention of clay-solidified grouting curtain to Cd^(2+), Pb^(2+) and Hg^(2+) in landfill of municipal solid waste

The effects of components and their ratio of grouts on anti-seepage capability of clay-solidified grouting curtain and its permeability of heavy metal cations were investigated by permeating experiments, using reactive solute transport model to study the permeation of heavy metals (Cd2+, Pb2+ and Hg2+). The study of permeating for different mixture ratios of cement and clay indicates that hydraulic conductivity of clay-solidified grouting curtain with different ratios of solid to liquid or with the same ratio of solid to liquid but with different ratios of cement to clay is changed. The laboratory simulation test results also show that precipitates produced in heavy metal cation migration process in curtain block up water flowing passage which makes the hydraulic conductivity of the solution-permeated curtain decrease with the leakage time. The permeation velocities for different heavy metal cations vary with ionic concentration, exchange capacity and ion radius etc. The test results indicate that the permeation rapidity order of heavy metals cations in clay-solidified grouting curtain is Hg2+>Pb2+ in the same experimental circumstance. In addition, permeability for different mixture ratios and antisepsis capabilities of clay-solidified grouting curtain were studied in tests.

Studies on Effect of Syrup Concentration and Drying Modes on Quality of Kesar Mango Slices

An attempt was made to preserve mango slices by treating with 2% calcium chloride solution followed by dipping into sugar syrup of different concentrations i.e. 50°, 60° and 70 °Brix respectively. The treated slices were subjected for drying in different modes of drying （oven, microwave oven and cabinet tray drying） and analyzed for various physico-chemical and organoleptic quality characteristics. The study revealed that the osmo-air dried slices of mango produced with partial dehydration facilitated by osmotic agent （sugar syrup of 60 °Brix. A fruit： sugar syrup ratio of 1：4 （w/v） for 18 h at 40 ℃ temperature） followed by mechanical drying showed superiority in sensorial quality attributes over other concentrations of ingredients and the rest of the modes of drying. The good quality osmotically dehydrated mango slices could be preserved with maximum retentions of vitamins with better dehydration, rehydration and sensorial quality characteristics.

液固浸渗挤压成形C_(f)/Al复合材料环形薄板件工艺研究

提出一种挤压头与板件截面积之比小于1的复合材料制备工艺方法,对浸渗过程进行了分析,并探究了不同工艺参数对浸渗质量的影响。优选的工艺参数:浇注温度为950℃,预热温度为560℃、挤压压力为35 MPa。采用此参数制备了浸渗良好的环形薄板件。所制备的复合材料密度比基体合金降低了14.8%,抗拉强度为125 MPa,比基体提高了58%。