5Cr21Mn9Ni4WNb2N奥氏体耐热钢晶界碳化物

5Cr21Mn_9Ni_4WNb_2N耐热钢锻造后在1200℃以上加热时，NbC聚集成大块，在1200℃以下加热时，NbC薄膜（片）的析出倾向随加热温度降低而增大，1130℃及其以下加热时，粒状和细片状M_(23)C_6随加热温度降低而增多，而且NbC块可作为碳源退化成M_(23)C_6颗粒，过高或过低温度的锻造加热，因晶界NbC块过大或晶界NbC薄膜（片）过多而不利于锻造加工。     

拧紧力矩和热应力对螺纹插装阀的影响分析

在分析螺纹插装阀整体结构和工作原理的基础上,建立螺纹插装阀阀套与阀芯间隙变化量在拧紧力矩和热应力作用下的理论计算模型,通过理论计算分析其间隙的变化规律,同时结合有限元分析结果对计算模型进行初步验证。结果表明:该计算模型可以用于分析螺纹插装阀在热应力下的使用性能,对螺纹插装阀的设计使用具有一定的指导意义。     

高压天然气球罐施工控制要点

详细介绍了2000m^3高压天然气球罐工程的制造、安装过程，并指出每个环节的控制要点。球罐投入运行后，工作状况良好。     

SiCp/Cu包覆粉体及其热沉材料的制备

采用化学镀铜工艺制备了Cu包覆SiCp复合粉体,并对复合粉体的组成和形貌进行了分析.同时,利用制得的复合粉体,结合适当的热压烧结工艺制备了Cu-35SiCp热沉材料,并对热沉材料的微观组织和热物理性能进行了研究.结果表明,SiCp颗粒在热沉材料的基体中均匀分布,界面结合良好.在试验条件下,Cu-35SiCp热沉材料的导热系数为165.7 W/(m·K),30～200 ℃温度区间内的热膨胀系数为15.1×10-6/K.     

Heat capacity of liquid and undercooled liquid metals and alloys

Trends in the dependences on temperature and concentration of experimentally determined heat capacities of liquid and undercooled liquid metals and alloys are discussed. A new adiabatic calorimeter for determining the heat capacity of liquid alloys up to 1500 K is described. The ability of several approximations and models to describe the different characteristics of the heat capacity of liquid and supercooled liquid metals and alloys is demonstrated.     

热型连铸过程的一维稳态传热模型

根据热型连铸技术原理，建立了热型连铸凝固过程一维稳态温度场的物理、数学模型。通过数值计算，得出了铸型出口温度、冷却距离、拉铸速度和喷水冷却强度等工艺参数对铸坯固液界面位置的影响。计算结果与试验结果吻合。     

小截面送料双频电磁成形的试验研究

研究了金属熔体的小截面送料双频电磁成形过程。结果表明：屏蔽罩能够调节成形感应圈内的磁场分布，使成形感应圈内的熔体处于合理状态；两感应圈间必须保持一定距离，使预热感应圈的磁场不影响成形感应圈的磁场分布，利于成形稳定；在其他条件一定的情况下，有一适合的抽拉速度和电源功率匹配；并获得了表面质量良好的耐热不锈钢样件。     

High resolution XPS characterization of chemical functionalised MWCNTs and SWCNTs

High resolution XPS analysis of chemical functionalised multi-wall carbon nanotubes (MWCNTs) and single wall carbon nanotubes (SWCNT) was done with ESCA300 (overall instrument resolution of 0.35 eV). Information to the degree of functionalisation was ascertained by argon ion bombardment of the samples followed by XPS analysis to detect the functional groups, the percentage atomic concentration of various elements present and whether or not the detected functional groups imposed a chemical shift on the CNT atoms. The results show that true chemical functionalisation was achieved and by argon ion bombardment these functional groups can be altered relative to the C 1s carbon atoms of the CNT. The choice of chemicals used for functionalisation, the techniques employed and the types of nanotubes treated are important factors in chemical characterisation. The carbon atom on the nanotube ring to which the functional group (atom) is bonded, the chirality of the CNT, the electronegativity of the functional group, the bond type and whether the CNT is single-wall or multi-wall, or cut (short) could play a role in determining the chemical shift on the CNTs atoms. These investigations are relevant to chemical functionalisation of carbon nanotubes for various applications for example DNA sensors and other biomedical sensors.     

高温高压设备瞬态密封分析的三维力学与传热学模型

以大型加氢反应器的高压法兰密封结构为研究对象，建立了瞬态及稳态密封分析的三维力学与传热学模型，主要解决了螺栓载荷的动态模拟和螺栓孔内空气环层的传热计算问题。利用该模型对加氢反应器的瞬态及稳态密封状况进行了计算。     

HEAT TRANSFER BETWEEN ROUGH SURFACES IN CONTACT OVER A HIGHLY ELLIPTICAL CONTOUR AREA: COMPARISON OF EXPERIMENTAL AND NUMERICAL RESULTS

This paper describes experimental and numerical studies of heat transfer between surfaces in contact over a highly elliptical area in a gas or in vacuum. Measurements of the steady-state thermal resistance of a high aspect ratio contact formed between cylindrical steel surfaces with widely different radii of curvature (76 cm vs 0.95 cm) are reported for two levels of surface roughness (0.05 μm and 1.0 μm rms) and compared to 3-D numerical results obtained with the multigrid method. Theoretical results obtained by evaluating the contact conductance acting over each surface element within the contour area with a method developed previously for rough but nominally flat surfaces are shown to be in excellent agreement with the rough surface experimental data.