φ8800mm焦炭塔的焊后整体热处理

介绍了直径8800mm的两台焦炭塔采取燃油法焊后整体热处理的工艺系统及热处理过程,各项 数据表明,整体热处理效果良好,完全符合设计要求。     

Vapor growth of novel carbon submicro-fibers with a tile-like form and carbon nanofibers with a zigzag form

Carbon submicro-fibers with a tile-like form and carbon nanofibers with a zigzag form were grown by a CVD process using iron powder as a catalyst, H₂S as an impurity, and acetylene as the carbon source. The morphology and the microstructure were examined, and the influence of the deposition conditions on their nanostructures was discussed. The results reveal that sulfur is indispensable for the growth of these two structures. Reaction temperature and total gas-flow rates also affected the deposits and their yield significantly. At 700 °C, it is suitable to grow the tile-like structure, while at higher temperature, such as 800 °C, it is suitable to form the zigzag structure.     

M2钢冷变形时微裂纹形核原位观察与机理

采用带拉伸机构的扫描电镜和透射电镜等实验手段研究了热轧退火状态Ｍ２高速工具钢在单向拉伸变形时微裂纹形核机制及位错塞积状态。连续观察到了单向拉伸变形时钢中碳化物粒子的开裂全过程。证实了位错塞积的存在及其对微裂纹形核的促进作用。     

用蛇纹石提镁残渣直接合成六配位有机硅化物

以蛇纹石提镁残渣为原料,采用常压蒸馏法直接合成了六配位有机硅化物。用红外光谱法和X射线衍射法分析了合成产物的结构。结果表明：合成的产物为有机硅化合物。实验确定的最佳合成条件为：氮气通入量50ml／min,反应时间2．Sh,乙二醇相对馏出量为75％。在此条件下,钡盐和钙盐的收率分别为86．5％和54．6％。     

Interfacial optimization of SiC nanocomposites reinforced by SiC nanowires with high volume fraction

High volume fraction SiC nanowires-reinforced SiC composites (SiCNWs/SiC) were prepared by hybrid process of chemical vapor infiltration and polymer impregnation/pyrolysis in this research. SiCNWs networks are first to be made promising a high volume fraction (20 vol%), and the pyrolytic carbon (PyC) interphase with 5 nm is designed on SiCNWs surface to optimize the bonding condition between SiCNWs and SiC matrix. Nanoindentation shows a modulus of 494 ± 14 GPa of SiCNWs/SiC composites without interphase comparing to the one with PyC interphase of 452 ± 13 GPa. However, the 3-point bending test shows a higher strength of the composite with PyC interphase (273 ± 32 MPa) comparing with the one without interphase (240 ± 38 MPa). The fracture surface is observed under SEM, which shows a longer SiCNWs pullout of the composite with PyC interphase. The energy dissipation during the 3-point bending test is calculated by the length of nanowire pull-out, it demonstrates that the SiCNWs with PyC interphase possess better performance for toughening composite. Further characterization proves that the PyC interphase can give SiCNWs/SiC composites higher fracture toughness (4.49 ± 0.44 MPa·m^1/2) than the composites without interphase (3.66 ± 0.28 MPa·m^1/2).     

A Self-Healing Amalgam Interface in Metal Batteries

Poor cyclability and safety concerns caused by the uncontrollable dendrite growth and large interfacial resistance severely restrict the practical applications of metal batteries. Herein, a facile, universal strategy to fabricate ceramic and glass phase compatible, and self-healing metal anodes is proposed. Various amalgam-metal anodes (Li, Na, Zn, Al, and Mg) show a long cycle life in symmetric cells. It has been found that liquid Li amalgam shows a complete wetting with the surface of lanthanum lithium titanate electrolyte and a glass-phase solid-state electrolyte. The interfacial compatibility between the lithium metal anode and solid-state electrolyte is dramatically improved by using an in situ regenerated amalgam interface with high electron/ion dual-conductivity, obviously decreasing the anode/electrolyte interfacial impedance. The lithium-amalgam interface between the metal anode and electrolyte undergoes a reversible isothermal phase transition between solid and liquid during the cycling process at room temperature, resulting in a self-healing surface of metal anodes.     

基于离心纺丝技术制备稳定的碳化锆纤维

本研究提出了一种利用离心纺丝技术制备稳定碳化锆(ZrC)纤维的有效方法。此方法使用醋酸锆和蔗糖作为锆源和碳源, 聚乙烯吡咯烷酮(PVP)作为纺丝助剂, 经过1600 ℃的裂解与碳热还原热处理后, 所纺原丝转化成由均匀纳米ZrC晶体组成的ZrC纤维。研究结果表明, 纤维中残留的少量碳可助力ZrC纤维在2000 ℃的超高温环境下仍保持较好的结构稳定性。     

三维碳化硅纳米线增强碳化硅陶瓷基复合材料的电磁屏蔽性能

碳化硅纳米线具有优异的电磁吸收性能, 三维网络结构可以更好地使电磁波在空间内被多次反射和吸收。通过抽滤的方法制备得到体积分数20%交错排列的碳化硅纳米线网络预制体。然后采用化学气相渗透工艺制备热解炭界面和碳化硅基体, 并通过化学气相渗透和前驱体浸渍热解工艺得到致密的SiCNWs/SiC陶瓷基复合材料。甲烷和三氯甲基硅烷分别是热解炭和碳化硅的前驱体, 随着热解碳质量分数从21.3%增加到29.5%, 多孔SiCNWs预制体电磁屏蔽效率均值在8~12 GHz (X)波段从9.2 dB增加到64.1 dB。质量增重13%的热解碳界面修饰的SiCNWs/SiC陶瓷基复合材料在X波段平均电磁屏蔽效率达到37.8 dB电磁屏蔽性能。结果显示, SiCNWs/SiC陶瓷基复合材料在新一代军事电磁屏蔽材料中具有潜在应用前景。