离子束电子束多功能材料表面处理设备

本设备由以下系统组成:注入系统,有溅射离子源及不对称三电极加速管,能量50keV,流强4mA(N~+);电子束系统,能量45keV,功率密度10~2—10~6W/ cm~2;配备微机程序的束偏摆装置;靶材易换的磁控溅射靶;可作旋转、平移、升降等机械运动的高真空工作室(φ500×1600mm)。可进行离子注入及混合、电子束上釉及合金化、磁控溅射离子镀等工艺。该设备为材料表面改性和薄膜制备提供了新的手段。     

铜合金制品常见缺陷分析及预防措施

分析了铜合金制品常见缺陷的产生原因,如：裂纹和开裂、气泡和起皮、过热和过烧等。并提出了相应的预防措施,这些措施可确保产品质量,有显著的经济效益。     

Controlled synthesis of core-mesoporous shell from biomass sustainable N-doped hollow carbonaceous nanospheres

Encompassing ecological and economic concerns, the utilization of biomass to produce carbonaceous materials has attracted intensive research and industrial interest. Using nitrogen containing precursors could realize an in situ and homogeneous incorporation of nitrogen into the carbonaceous materials with a controlled process. Herein, N-doped hollow core-disordered mesoporous shell carbonaceous nanospheres （HCDMSs） were synthesized from glucosamine hydrochloride （GAH）, an applicable carbohydrate-based derivative. The obtained HCDMSs possessed controlled size （-450-50 nm） and shell thickness （-70-10 nm）, suitable nitrogen contents （-6.7-4.4 wt.%）, and Brunauer-Emmett-Teller （BET） surface areas up to 770 m^2.g^-1. These materials show excellent electrocatalytic activity as a metal-free catalyst for the oxygen reduction reaction （ORR） in both alkaline and acidic media. Specifically, the prepared HCDMS-1 exhibits a high diffusion-limited current, and superior durability and better immunity towards methanol crossover and CO poisoning for ORR in alkaline solution than a commercial 20 wt.% Pt/C catalyst.     

370nm激光在结肠癌变早期诊断上的应用研究

本文利用Ｃｒ：ＬｉＣＡＦ可调谐激光器,经ＢＢＯ晶体倍频,获得了８ｍＪ、３４ｎｓ、３７０ｎｍ的巨脉冲激光;并利用３７０ｎｍ激光激发离体结肠癌组织和正常组织进行组织的自体荧光实验,并作了对比和分析,获得了对结肠癌变的早期诊断的很有价值的荧光光谱。     

丝锥用HYTV3高性能高速钢的耐磨性和可磨削性评价

介绍了河冶科技自主研发的丝锥用3V级HYTV3高性能高速钢与国外某厂3V级高速钢的性能。通过合金化设计、精准化工艺控制,HYTV3高速钢获得细小均匀的MC碳化物组织。通过改变磨削加工类型、砂轻材质、砂轮转速参数,对比了M2、HYTV3、M3、GV3、M35五种材质的耐磨性和可磨削性,证明HYTV3高速钢在保持良好耐磨性的同时具有优异的可磨削性。     

Effects of Ti,Al and Hf on niobium silcides formation in the Nb-Si <Emphasis Type="Italic">in situ</Emphasis> composites

The effects of alloying elements Ti, Al and Hf on niobium silicides formation in the Nb-Si in situ composites have been investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The binary, ternary and multicomponent alloys have been fabricated by vacuum non-consumable arc melting method. The results show that Ti tends to stabilize Nb₃Si phase, while Al promotes the direct formation of β-Nb₅Si₃ phase with a tetrahedral D8 _m structure. Exceptionally, it seems that Hf is beneficial to the formation of γ-Nb₅Si₃ phase with a hexangular D8₈ structure. For the multicomponent Nb-Si in situ composites, the cooperative effects of different elements on niobium silicides formation basically maintain the character of ternary system.