真空渗流法制备泡沫铝及其动态力学性能的研究

以真空渗流法制备陶瓷中空球泡沫铝,研究了应变率对吸能量和吸能效率的影响、相对密度对屈服强度的影响,并与普通泡沫铝进行比较。结果表明,工艺简单可行,所制备的泡沫铝的动态压缩应力-应变曲线只有弹性变形区和塑性变形区;随应变率的增大,屈服强度和吸能效率变化规律不明显,吸能量增大;随相对密度的增大,屈服强度增大,吸能量增大,吸能效率也增大;动态压缩时两种泡沫铝的吸能效率均较高,最大吸能效率大于0.9,是良好的吸能材料。     

真空压铸的发展

真空系统是压铸过程中排除气体的最有效的方法之一。然而，真空压铸的发展几经起伏，现在则发展到一个新的阶段。从模具中抽出气体是几种抽气方法中较为简便的一种。真空气道的设计与常规气道则有所不同     

牙科烤瓷炉在高温下的真空密封措施

介绍了自动可编程真空烤瓷炉在烤瓷工艺过程中，温度对真空度及密封的影响，以及相应所采取的有效的真空密封措施。运行实践表明：该密封措施稳定、可靠，简单易行，便于实现烤瓷过程的自动化。     

The effect of vacuum evaporation plating on phase structure and electrochemical properties of AB5–5 mass% LaMg3 composite alloy

In this paper, Cu, Al and Ni were plated on the AB₅–5 mass% LaMg₃ composite hydrogen storage alloy using a vacuum evaporation plating method. The phase structure and the electrochemical properties were investigated. The X-ray diffraction (XRD) analysis shows that the phase structure is not changed obviously after the plating Cu, Al and Ni on the composites. The electrochemical tests show that maximum discharge capacity, high rate dischargeability (HRD), dischargeability at low temperature and cyclic stability was improved by vacuum evaporation plating Cu, Al and Ni. Maximum of discharge capacity of the AB₅–5 mass% LaMg₃ composite alloy plating Ni can reach 351 mAh/g, which is 3.5% higher than that of the untreated. HRD at I_d = 1200 mA/g of the composite alloy plating Cu is 45.0% of that at 60 mA/g, which is 20.4% higher than the untreated. Discharge capacity of the composite alloy plating Cu at low temperature 233 K is 205 mAh/g, which is 57.3% of that at 298 K, and it is much higher than 36.8% of the untreated composites. The discharge capacity retention of the composite alloy plating Al after 200 cycles is 7.8% higher than the untreated.     

气提式双锥干燥机的开发

介绍了双锥回转真空干燥机的一种改良型机种——气提式双锥干燥机。这种干燥机不但具有原机的优点，并且有效地解决了原机在干燥中易结块成团和大型化困难等问题     

Drying characteristics of porous material immersed in a bed of hygroscopic porous particles fluidized under reduced pressure

A relatively large wet material was immersed in a fluidized bed of hygroscopic porous particle (silica gel beads) under reduced pressure. And then the drying characteristics were compared with those in the case of inert particle (glass beads). The comparison of drying characteristics is performed experimentally and theoretically. In calculation, the water transfer from the sample to the fluidized bed was considered. The calculation results are in good agreement with the experimental data. The effects of the operational conditions (the pressure in the drying chamber and the temperature of the drying gas) on the drying characteristics were also examined in both fluidizing particles.The drying finishes earlier in the case of hygroscopic porous particle than in the case of inert particle regardless of pressure in the drying chamber, since the water transfer from the sample facilitates the drying in the case of hygroscopic porous particles. The temperature decrement in drying appears in the case of inert particle. This phenomenon is also observed in the case of hygroscopic porous particle, but the decrement degree of the temperature is much smaller than that in the case of inert particle. The difference of the minimum temperature in the sample in drying between the cases of hygroscopic porous particle and inert particle is very slight for different pressures in the drying chamber.     

真空增压铸造技术及其应用前景

详细论述了真空增压铸造的技术原理、工艺特性及技术优点。结合铝合金铸件大型、复杂、薄壁、整体化和高气密性的发展趋势，针对性地分析了真空增压铸造技术推广应用的适应性，并提出了相应的技术对策。     

EPC干砂造型工艺分析

干砂、加砂方法、砂箱、模型及模型族、振动、负压等因素对消失模铸造都有不同程度的影响，合理地控制这些因素对稳定铸造工艺及提高铸件质量是非常重要的。     

高速钢表面硬质合金覆层的组织及性能

通过热喷涂-真空粉末烧结的方法在高速钢表面制备硬质合金覆层，分析了硬质合金覆层组织和界面结构的特点、测试了硬质合金覆层的结合强度、硬度和耐磨性。结果表明，热喷涂后经过1200℃烧结，获得1—3mm厚度的硬质合金覆层，结合强度达到450MPa，硬度达到85HRA，具有较高的耐磨性能。     

多晶硅的真空感应熔炼及定向凝固研究

以工业硅为原料进行了多晶硅的真空感应熔炼及定向凝固研究，用自行设计的真空定向凝固设备制备了多晶硅铸锭。金相显微镜观察显示铸锭的显微组织为粗大的柱状晶，经电感耦合等离子体发射光谱仪分析，其纯度由99．50％提高到99．86％，各种杂质含量都有所减少。