氨汽提合成塔腐蚀控制探讨

分析尿素合成塔腐蚀机理、类型,并提出防腐蚀的控制方法。     

α－SiC：H薄膜的热行为研究

采用射频反应溅射工艺沉积了α—SiC:H薄膜。利用微分扫描量热器(DSC)和差热分析仪(DTA)两种热分析方法确定了α—SiC:H薄膜的脱H过程和相转变温度，353．2℃脱Si—H和602．6℃脱C—H，并在1080℃相变结晶。在氨气流保护下的光热炉内进行热处理，Fourier红外光谱(FTIR)和反射谱的研究表明，400℃热处理后薄膜内的H含量急剧下降。高温热处理中的脱H过程有利于游离硅和游离碳的反应形成额外的Si—C键，促进薄膜致密，并能提高其在紫外部分的反射率，降低红外区域的反射率。热处理温度超过500℃，容易导致薄膜脱落。适当的退火工艺有利于拓展碳化硅薄膜在空间材料上的应用。     

Application of the Stepwise-Regression Method in Calculating High-Temperature Ceramic Phases

Phase calculation for nonequilibrium multicomponent systems is attempted using the stepwise-regression method. The experimental data (the amount and composition of glassy phase in a system of Al₂O₃–SiO₂ ceramics as functions of the state of the original materials, the firing temperature, and the composition of the samples) are treated by the proposed method. The equations obtained are accurate in estimating the amount and composition of glassy phases in the system, showing that the stepwise-regression method is effective in phase calculation.     

植酸制备的研究

介绍了制备植酸的一种新方法及制备过程，对实验的各个影响因素作了细致的讨论，得到了实验的最佳工艺条件。     

管式振荡流反应器的流动模式研究 (II)高振荡强度下的流动模型和模拟

根据高振荡强度下的粒子成像流场可视化实验结果,在分析振荡流场中漩涡结构特征的基础上,提出用带有二次流区的全混腔室和室间返混的多釜串联模型来表征高振荡强度下的管式振荡流反应器流动特性。根据停留时间分布实验结果,运用小生境遗传算法优化求解模型参数与振荡参数之间的定量关系。模拟计算表明,优化后的模型给出的停留时间分布曲线与实验结果吻合良好。     

八碳烯分离工艺的研究

从能量综合集成的角度提出了八碳烯精馏分离工艺 ,对所提流程进行了优化模拟计算及分析 ,为八碳烯分离工艺的施工设计提供了充分的依据。投产情况表明 ,该研究改变了八碳烯的生产现状 ,使得八碳烯生产的经济效益显著提高     

聚乙烯复合阻燃体系的研究及应用进展

综述了近年来国内外阻燃聚乙烯（PE）用有协同作用的复合阻燃体系：（1）卤-锑体系；（2）磷-氮体系；（3）金属氧化物体系；（4）膨胀型体系；（5）其他类等5类复合阻燃体系的研究和应用情况。     

喷射电沉积块体纳米晶Co-Ni合金工艺的研究

利用扫描电子显微镜（SEM），能谱仪（EDS）及X射线衍射（XRD）等分析方法研究了工艺参数对电解液喷射电沉积法制备块体纳米晶Co-Ni合金沉积层成分及结构的影响。结果表明；在本实验条件下，随电解液喷射速度的增加，沉积层中钴含量增加，而晶粒尺寸减小；随电解液温度的升高，沉积层中钴含量减小到一定值后增大，晶粒尺寸呈相反的趋势。沉积层的表面形貌为胞状结构。     

An EXAFS study on oxidic and sulfided K-MoO3/γ-Al2O3 catalysts

By analyzing the extended X-ray absorption fine structure (EXAFS) of the Mo K-absorption edge, structural information for both oxidic and sulfided K-MoO₃/-Al₂O₃ catalysts with different potassium content was obtained. The oxidic samples show two backscatterer peaks in the radial distribution function (RDF), which correspond to the Mo-O coordinations in the nearest Mo-O shell. The nearest oxygen atoms are present with large configurational disorder. The RDF for the K/Mo = 0 sample is significantly different from that for crystalline MoO₃ and ammonium heptamolybdate. The RDFs for potassium promoted samples are, in some extent, similar to that for ammonium heptamolybdate. The sample with K/Mo = 0.8 and that with K/Mo=1.5 do not show obvious difference in their local Mo-O structures. The EXAFS results support the earlier conclusions from Raman spectroscopy studies on identical samples [7]. When the samples are sulfided, a rearrangement of the local neighbors around Mo atoms takes place, to form small MoS₂-like crystallites. The Mo-S and Mo-Mo coordination distances on these catalysts are the same as those in crystalline MoS₂, but the coordination numbers are significantly lower than in MoS₂. The EXAFS results indicate that Mo species on the K/Mo=0 catalyst mainly consist of Mo-S-Mo units (the basic building units of MoS₂), which are highly dispersed and show a higher level of disorder than in MoS₂. With the modification by the potassium promoter, Mo species are significantly aggregated and their local neighbors are more similar to those in MoS₂, but the Mo species still exist in a state of high dispersion.     

RTM二维径向流动模型的理论概况及研究

综述了牛顿流体在放置了各向同性和各向异性预制件的RTM平板模具中二维径向恒流和恒压渗流的流动模型.对各个模型的可测量物理量之间的关系通过求解其解析解进行了必要的拓展补充推导和研究分析,对传统的二维解析方程进行了拓展和改进,提供了在不透明模具中测定渗透率的方法.即在恒流条件下利用压力传感器和恒流泵测定预制件的二维渗透率;或者在恒压条件下利用数字流量计和压力表测得二维渗透率.这些解析解的关系式也可用于实验预估模具中的压力分布及充模时间等.