钛基复合材料的高周疲劳性能研究

研究了TiC粒子增强的钛基复合材料的室温轴向高周疲劳性能。测试Kt=1的试样时采用的试验频率为76Hz，R＝0．06和R＝－1时，复合材料的室温疲劳强度分别为594MPa和494MPa。试验结果表明TiC粒子增强的钛基复合材料的室温高周疲劳性能与细晶组织的Ti-6Al-4V和IMI834的相当。复合材料内含有较细小的薄片状组织，这种组织为α β相互相交错构成，这种细小的α β相间的层状组织对于阻止疲劳裂纹的扩展和提高疲劳裂纹的扩展寿命有重要作用。退火后的复合材料疲劳裂纹扩展区规则且较宽广，从而也使复合材料具有较高的疲劳强度，疲劳裂纹扩展寿命延长。     

IFR-2000阻燃聚丙烯热性能研究

研究了用无卤膨胀型阻燃剂IFR-2000作阻燃剂的阻燃聚丙烯的热性能和阻燃性能。     

电磁屏蔽涂料的发展现状及趋势

电子产品的日益普及使得电磁干扰成为一个突出问题,应用电磁屏蔽涂料是消除电磁干扰简单而有效的方法,本文介绍了电磁屏蔽涂料的组成、效能评价方法、技术思想、存在的问题以及发展趋势。复合型以及水性屏蔽涂料具有广阔的研发前景,高效能、宽频带、寿命长的电磁屏蔽涂料将会受到市场欢迎。     

石粉与粉煤灰复合作水泥混凝土掺合料的性能研究

石粉为石材加工过程中产生的废料，但其可与燃煤电厂排放的粉煤灰复合作水泥混凝土的掺合料。研究结果表明：石粉按一定掺量与粉煤灰复合后掺入水泥混凝土中，其强度、抗渗透性和抗钢筋锈蚀性均比单掺粉煤灰混凝土的有所提高，其中以6％和9％的石粉掺量与粉煤灰复合掺入混凝土中的性能为最好。     

Hydrogen sorption sites in the gallium containing hybrid catalysts used for the aromatization of light alkanes

Gallium species which were incorporated initially in the oxide form, were all in the (+3) oxidation state in the hybrid catalyst and exhibited two types of hydrogen chemisorption sites, s_hw and s_hs. The stronger sorption sites shs which predominated at higher gallium dispersion, corresponded probably to the most effective surface configuration for gallium in the aromatization ofn-butane.     

羟基磷酸铁铵的制备与表征

采用硫酸亚铁和磷酸为原料,在尿素存在的条件下,水热合成得到高纯度的羟基磷酸铁铵。研究发现,反应温度不同得到的羟基磷酸铁铵的结晶度会有所不同,形貌差异较大。利用XRD、SEM、TG-DTA和红外分析等手段对制备的样品组成、结构、晶型和形貌做分析表征,分析了羟基磷酸铁铵在加热过程中的相变过程。结果表明,在静态羟基磷酸铁铵中,磷酸和铁具有固定的化学计量比,经高温煅烧后得到高纯度磷酸铁,可应用其制备锂离子电池正极材料磷酸铁锂的前驱体,且此法合成工艺简单,具有良好的工业应用潜质。     

Co－Mo／MgO－Al_2O_3一氧化碳耐硫变换催化剂失活原因的探讨

采用程序升温硫化（ＴＰＳ）技术，微反—色谱法（ＭＲＣ）、扫描电镜、透射电镜和其它分析测试手段，对工业应用前后的Ｃｏ－Ｍｏ系耐硫变换催化剂Ｋ８－１１进行了分析，从而对其失活原因进行了分析和讨论     

釉中晶相对防静电陶瓷电性能的影响探讨

以Sb掺杂的SnO2半导体为导电填料,选取透明釉、钡无光釉、锆乳浊釉为基釉进行了防静电陶瓷的研制。通过XRD、SEM、EDS等测试手段对防静电陶瓷进行了显微结构分析,重点探讨了基釉中晶相成分与防静电陶瓷电性能的关系。结果表明,釉中晶相对防静电陶瓷电性能的影响是晶相的阻隔作用、釉成分的偏析、导电成分的偏析三者综合作用的结果,透明釉、钡无光釉能制备电性能良好的防静电陶瓷,而锆乳浊釉中锆英石晶相会降低防静电陶瓷的表面电阻,不适于制备防静电陶瓷。     

Synthesis and Characterization of Highly Dispersed Antimony-Doped Stannic Hydroxide Nanoparticles: Effects of the Azeotropic Solvents to Remove Water on the Properties and Microstructures of the Nanoparticles

Highly dispersed antimony (Sb)-doped stannic hydroxide nanoparticles have been successfully prepared using the solution chemistry method. The properties and microstructures of the nanoparticles are investigated in detail by means of infrared, transmission electron microscope, X-ray diffractometer, and Brunauer-Emmett-Teller nitrogen surface area measurements. The results indicate that the properties and microstructures of the nanoparticles strongly depend on the azeotropic solvents used to remove water at the drying stage. Various azeotropic solvents are screened to investigate their effects on the size and dispersivity of dried Sb-doped stannic hydroxide. Three empirical rules are drawn for selecting an effective azeotropic solvent: (1) the solvent molecule should contain at least one atom such as oxygen as the hydrogen (H)-bond acceptor to form H bonds with the surface –OH (acting as an H-bond donor) of polymer particle; (2) the H-bond acceptor should locate in the middle of the alkane chain rather than on the terminal so that the alkane chain can stretch out and cover more surface area, improving the dispersivity of the dried product; and (3) the solvent should have a higher boiling point (∼140°C) to reduce the time of azeotropic distillation for removing water and maintain a lower residual amount of azeotropic agent. Based on the empirical rules, it is discovered that iso-amyl acetate is the most effective azeotropic solvent.     

MAH接枝EPDM增韧PA66的研究

研究了MAH(马来酸酐)接枝三元乙丙橡胶(EPDM—g-MAH)对尼龙66(PA66)的增韧作用。利用SEM(扫描电镜)观察了共混体系的微观形貌(形态结构)，并运用小角激光散射(SALS)方法研究了EPDM的加入对PA66结晶性能的影响。结果表明，未接枝的EPDM与PA66的相容性很差，而EPDM—g—MAH与PA66相容性明显增加，EPDM-g—MAH粒子均匀分散在PA66中，共混体系力学性能有很大提高。随着EPDM—g—MAH用量的增加，PA66球晶尺寸变小，共混体系界面结合更加紧密。