聚四氟乙烯泡沫材料的成型工艺

<正> 本文从工艺等方面介绍了聚四氟乙烯(PTFE,以下简称F_4)泡沫材料的成型。用本文所述的方法生产的F_4泡沫材料,适用于过滤高纯度或强腐蚀性的气体、液体介质,蓄电池气塞、衬垫、中低压密封元件、锅炉波管预热器、密封圈和军用微波大功率天线罩、以及行馈网络雷达天线等。其主要性能:介电常数1.12～2.0,介电损耗角正切(1～5)×10~(-4)。     

The Formability of AZ31B Magnesium Alloy Sheet

The forming limit diagrams （ FLD ） of AZ31B magnesium alloy sheet were tested by means of the electro etching grid method based on the forming experiment of magnesium alloy sheet carried out with a BCS- 30D sheet forming testing machine and the strain testing analysis made with an advanced ASAME automatic strain measuring system. Experiments show that, at room temperature, the mechanical properties and deep drawing peorformance of AZ31B cold-rolled magnesium alloy sheet were so poor that it failed to test the forming limit diagrams without an ideal forming and processing capacity, while the hot-rolled magnesium alloy sheet was of a little better plasticity and forming peorformance after testing its forming limit diagrams. It can be concluded that the testing of the forming limit curves （ FLC ） offers the theoretical foundation for the drawing of the deep drawing and forming process of magnesium alloy sheet.     

Observation and computer simulation of multicomponent chemical short-range order （MCSRO） for the bulk metallic glasses

The atomic configuration of chemical short-range order (CSRO) for the Zr-base metallic glasses was investigated by using nano-diffraction and high resolution transmission electronic microscopy (HRTEM) technology with a beam size of 0.5 rim. It is illustrated that the pattern of atomic configuration of CSRO might have various compound counterparts because of the chemical interaction of bonding atoms. Some atomic configuration of MCSRO is similar to the icosahedral structure with 10-fold symmetry of very weak spots. In deed, the nano-beam technology could clearly detect the evolution of atomic configuration in nanometer scale during the transformation from the metallic melt to the primary crystallization. The local atomic configuration of CSRO is also investigated by molecular dynamics simulation (MD) for the Zr2Ni compound in a wider temperature range. The CSRO in the melt could be pictorially demonstrated as distorted coordination polyhedron of the compound structure and/or the structure similar to cubo-octahedron analogs. The MD simulation illustrates that the atomic packing of long-range order disappears just above the melting point, but the chemical interaction of bonding atoms still exists that leads to form the various CSRO with the atomic configuration similar to stable or metastable unit cell of Zr2Ni compound. The icosahedral polyhedron became more abundance as the overheating temperature was raised.     

一套完美的系统：新型的热成型、填装以及密封设备保证了生产线的顺利运行

包装设备的工艺稳定性和可靠性操作是影响制药工业生产工艺的最为关键的因素。当包装生产线中的设备是由不同的供应商提供的设备连接到一起组成时，就有可能产生一些问题。目前Gerhard Schubert公司已经开发出一种新型的热成型、填装以及密封设备，可以保证生产线无故障连续运行。     

阻燃PBT

Ticona推出5种新型阻燃Celanex PBT配混料，改进了薄壁成型的加工性，阻燃和机械性能更好。这种新树脂的流动性比别的阻燃PBT高15％～20％，循环周期要快10％-15％。其加工窗口更宽，加工热稳定性能更好。这些配混料不喷霜，可以使用高至25％的回用料。Cleanex 14系列包括了7．5％、15％、30％玻纤填充品级、非填充和冲击改性品种。30％玻纤品级（Celanex 3314）壁厚为0．39mm时满足UL94V—0，而竞争品级的壁厚要达到0．7lmm。这些可着色的配混料的机械强度和电气性能也得到提高。     

高新技术成果产业化模式探讨

在"九五"期间,我国863计划围绕着高技术陶瓷制备工艺落后、陶瓷材料可靠性低、制造成本高的关键问题,由清华大学黄勇教授课题组承担题为"低成本、高性能陶瓷胶态注射原位快速凝固成型新工艺的研究",旨在降低陶瓷的制造成本,提高材料的可靠性,实现复杂形状陶瓷零部件的净尺寸的成型和烧结,促进高技术陶瓷的产业化进程。到了"十五"863 计划又将"高可靠性陶瓷部件批量化成型关键技术及装备" 的课题作为第一启动项目,为高技术结构陶瓷的产业化带来一线曙光。经过"九五"和"十五"863计划的潜心攻关和研     

圆模成型V带传动弯曲应力分析

在考虑圆模成型橡胶Ｖ带制造过程中的曲率的基础上，对传动中Ｖ带所受的弯曲应力进行了理论分析，修正了圆模成型Ｖ带的橡胶配料设计理论，为此种Ｖ带疲劳失效机理研究提供了理论依据。     

某高层住宅楼转换层施工案例分析

讨论了厚板迭合层的几种施工方法，并对其中二次迭合成型施工法进行了详细的论述，通过具体案例分析，进行了技术经济比较，为类似工程的应用提供了参考。     

快速成型技术在企业中的应用

本文叙述了快速成型技术应用于企业的意义，介绍了国产快速成型设备的概况，展望了快速成型技术的应用前景。