Al2O3包覆石墨颗粒的制备及表征

以Al(NO3)3·9H 2O为主要原料,采用非均匀成核技术在鳞片状石墨表面包覆一层Al2O3,制备成石墨/氧化铝复合粉体.对复合粉体的制备条件、表面形貌和特性进行了研究.研究表明pH值、处理温度和覆层物质前驱体浓度是影响包覆的主要因素.TEM观察和XPS能谱检测表明,石墨颗粒表面均匀包覆有一层Al2O3.包覆后石墨表面由疏水转为亲水.     

导电复合材料的研究

以铝粉，乙炔炭黑，石墨等导电填料，不饱和聚酯树脂为基休一项玻璃纤维布为增强材料制成复合型导电复合。研究了导电填料不同种类，添加量对复合材料性能的影响。     

锂离子电池炭负极材料研究现状与发展

综述了近年来各种炭材料作为锂离子电池负极材料的新进展，着重分析了石墨、焦炭和难石墨化炭在放电容量、不可逆容量损失、充放电电位和充放电速率等主要性能上的差异以及与其结构之间的联系；指出以PAS为代表的热解炭(低于800℃)和纳米炭材料将是锂离子电池负极材料的发展方向。     

氧化硼作为电极涂层的研究

以水和磷酸二氢铝为粘结剂，对氧化硼作为电极防氧化涂层进行了研究。通过调整涂层的配比浓度，并采用预先浸泡的方法，使涂层与电极本体的粘结性能提高，石墨炭块试样在900℃的高温下长时间不氧化。     

聚乙烯/石墨阻燃复合材料的研究

研究了石墨、可膨胀石墨、膨胀石墨 /聚乙烯复合材料的阻燃性能。结果表明 ,石墨具有一定的阻燃作用 ,可膨胀石墨具有良好的阻燃效果。但可膨胀石墨填充的复合材料力学性能较差     

LDPE/石墨导电复合材料的研究

为了制备具有低渗滤阈值的导电复合材料，通过溶液插层法，选用三种不同的导电填料（石墨，膨胀石墨，膨化石墨），引入马来酸酐接枝聚乙烯。制备低密度聚乙烯/石墨导电复合材料，导电填料的结构对复合材料的电性能和力学性能有很大的影响，其中膨化石墨可使复合体系具有较低的导电渗滤阈值，但复合材料的力学性能较差。     

基于环状电极的电容式润滑油磨粒检测系统设计

摩擦副非正常磨损时将产生直径为几十微米的大金属磨粒。采用阻抗类方法检测磨粒时,要求传感器具有较高的灵敏度。为此,设计了差分结构的环状极板电容式传感器。应用电容/数字转换芯片AD7746将传感器的输出直接转换为数字信号,省去了前端复杂的信号调理电路,简化了设计,并且有效地降低了寄生电容和杂散电容的影响。实验表明:系统分辨率可以达到0.125 fF,极大提高了系统灵敏度。     

Migration of Intergranular Liquid Films and Formation of Core-Shell Grains in Sintered TiC–Ni Bonded to WC–Ni

When TiC–20 wt% Ni powder mixtures are sintered at 1400°C, relatively large TiC grains possibly containing some Ni form with near-equilibrium shapes. When these specimens are heat-treated again at 1400°C in contact with sintered WC–20 wt% Ni pieces, the liquid films between the TiC grains in the contact region migrate against their increasing curvatures, forming (Ti,W)C solid solution behind them. These migrating liquid films reverse their directions on further heat-treatment. As in other alloys, this liquid film migration must be driven by the coherency strain energy produced by W diffusion at the surface of the dissolving TiC grains. Shells of (Ti,W)C solid solution also form around the cores of TiC grains near the contact region, and this process is probably driven by both coherency strain energy and free energy of mixing. At some contact regions, (Ti,W)C precipitates nucleate and grow, probably driven mainly by the free energy of mixing. In powder mixtures, the formation of core-shell grains is expected to be driven by the coherency strain energy, the free energy of mixing, and the capillary effect.     

Raman spectra of virgin and damaged graphite edge planes

First-order Raman spectra of virgin and ion irradiated highly oriented pyrolytic graphite were performed along the basal and edge planes. Ion irradiation was performed in the low fluence regime (≈ 10¹²–10¹³ ions cm⁻²) using a 400 keV Ar⁺ beam in order to a introduce controlled amount of defects in the structure. Virgin edge Raman spectra reveal the presence of a 1351 cm⁻¹ structure (D^*) shifted 10 cm⁻¹ away from the disorder induced D-line found upon irradiating or grinding the graphite surface.The 1351 cm⁻¹ D^* structure is then considered as the feature coming from the rupture of the D_6h⁴ space group symmetry. A comparison between D^* and the classical 1360 cm⁻¹ D-line is discussed in terms of induced disorder.     

一种新型吸附剂在痕量重金属分析中的应用

以二苯并18-冠-6交联席夫碱型壳聚糖作为新型吸附剂，用石墨炉原子吸收分光光度法测定了经过滤处理后的燃煤烟气中痕量铬、镉和铅的含量。经过滤处理后的燃煤烟气含铬1．42／μg／m3，其中三价铬占54．20％，为0．77μg／m3，镉0．256μg／m3，铅5．30μg/m3。