化学共沉淀法制备铬锡红色料的研究

采用化学共沉淀法制备了铬锡红色料，结果表明，加入量为１５％氟化钠作为矿化剂的试样在１０００℃开始呈现美丽的玛瑙红色，到１３００℃合成出高品位、高温稳定的铬锡红色料。化学共沉淀法与固相合成法相比，其呈色更好，粒度分布范围更窄，关键在于改善由顺序沉淀引起的组分偏析。     

复混肥生产技术综述

综述了复混肥料的生产技术和特点，介绍了团粒法，料浆法，熔体法以及挤压法生产颗粒复混肥的工艺流程。     

磁性Fe3O4纳米颗粒制备方法的比较

使用醇-水法、氢氧化钠共沉淀法和氨水共沉淀法制备磁性Fe3O4纳米颗粒.制得的纳米Fe3O4用饱和油酸钠的醇溶液进行改性.采用XRD,SEM,TEM,IR和振动样品磁强计等手段对制备的样品进行了表征研究.实验结果表明三种方法中,醇-水法和氨水共沉淀法所制备的纳米Fe3O4表面改性效果良好;氨水共沉淀法制备的颗粒磁性最强,但实验时间长;醇-水法制备的粉体粒径最小,但颗粒分散情况相对较差;氢氧化钠共沉淀法最简单,实验时间最短,收率也较高,但粉体性能不如其它两种.     

粉红色釉料的研究

用陶瓷法、溶胶-凝胶法和共沉淀法以及三种矿化剂试验确定形成可用于透明釉和乳浊釉的粉红色料的最佳方法。     

合成方法对LiCo1/3Ni1/3Mn1/3O2材料结构与性能的影响

本文用高温固相法和共沉淀法合成了层状结构的LiCo1/3Ni1/3Mn1/3O2材料.用X射线衍射仪(XRD)、环境扫描电子显微镜(ESEM)、电化学工作站、充放电仪等设备测试了该材料的结构和电化学性能.结果表明共沉淀法合成的材料层状结构更明显,颗粒的粒度小,材料的可逆性好.放电比容量和循环性能均优于高温固相法合成的材料.     

溶胶凝胶法制备铬锡红色料研究

采用溶胶－凝胶法制备了铬锡红色料,对不同矿化剂,不同温度下合成的色料进行了ＸＲＤ、ＩＲ、可见分光光度和颗粒度的测试。结果表明：在采用适当的矿化剂所合成的色料中,锡榍石含量在１２００℃已达到最大值;铬己固溶入锡榍石晶格中取代了部分锡,从而使色料呈现玛瑙红色,在１２００℃合成出高品位、高温稳定的铬锡红色料,这个温度比固相法合成的温度降低了１００℃。与固相合成法相比采用溶胶－凝胶法合成的试样其呈色更好,     

液相共沉淀法合成浸渍阴极用Ba5CaAl4O12

Ba5CaAl4O12是浸渍阴极电子发射最主要的活性物质。采用液相共沉淀法，通过调节共沉淀反应的金属盐溶液浓度、溶液的pH、沉淀剂的加入方式及洗涤方式，制备出分散良好的超细碳酸钡、碳酸钙、氢氧化铝的混合前驱体粉末，经1200℃煅烧2h，得到超细粉末。采用XRD，SEM分析产物粉末的物相组成、颗粒形貌，结果表明产物为具有Ba5CaAl4O12结构的结晶颗粒，粒径在0．2～0.5μm。     

白光LED用Eu掺杂钨、钼酸盐红色荧光粉的研究进展

详细介绍了近几年来白光LED用Eu掺杂钨、钼酸盐红色荧光粉的制备方法:高温固相法、溶胶—凝胶法、水热法、共沉淀法等。总结了这几种方法及钨、钼酸盐红色荧光粉的优缺点,并对高发光效率样品的制备提出了一些可行研究方案。     

纳米远红外陶瓷粉体的制备工艺与性能研究

本研究分别采用固相合成法和液相共沉淀法制备远红外陶瓷粉体，采用X光小角散射法测试其颗粒分布和平均粒度，采用XRD分析其物相和SEM观察其显微结构形貌，结果表明，液相共沉淀法制备的远红外陶瓷粉体的平均粒度达到95纳米，且颗粒大小分布窄，而固相合成法制备的远红外陶瓷粉体颗粒粗大且不均匀，经中国计量科学研究院测试，液相共沉淀法制备的远红外陶瓷粉体的法向全辐射发射率为93％，固相合成法制备的远红外陶瓷粉体的法向全辐射发射率仅为82％。     

共沉淀法合成磷酸铁锂的途径概述

共沉淀法合成LiFePO4材料的步骤简单,成本低且颗粒均匀,通过控制材料的形貌,粒径,可制备出高振实密度,高倍率性能良好的材料。随着对共沉淀法的深入研究,合成的途径也越来越多,文章介绍了不同LiFePO4材料的合成途径和各种途径的优缺点,并对共沉淀法包覆和掺杂改性的研究情况做了简单的介绍。     

SEDIMENTATION OF BINARY MIXTURES OF PARTICLES OF UNEQUAL DENSITIES AND OF DIFFERENT SIZES

A model is developed for the sedimentation from a suspension of two particle species of unequal densities and of different sizes. The composition and the thickness of various layers in the sediments are predicted using graphical and analytical methods. The model predictions were in excellent agreement with experimental results, when the particle size ratio was ≥ 108. When size ratio of the particles was 2.60 and 4.31 the agreement occurred in about 50 percent of the cases.     

COMPARISON OF METHODS OF ANALYSIS OF GYPSUM1

The different analytical methods proposed for the evaluation of gypsum have been subjected to an experimental test. A combination method, consisting of a fusion with KHCO₃ and determination of CaO by KMnO₄ titration, the SO₃ by Andrews method of titration of BaCrO₄ has been found to give very reliable results with the least consumption of time.     

骑式摩托车油箱喷涂工艺的改进

面对日益激烈的市场竞争,摩托车油箱外观质量越来越成为影响销售的因素之一。文章介绍了改进工艺后的油箱涂装,该涂装体系提高了油箱外观的丰满度,降低了油箱涂装的生产成本。     

氢气纯度分析方法准确性的探讨

ONACCURACYOFANALYSISOFOFHYDROGEN1前言我公司目前应用的氢气纯度分析方法有两种,一种是爆炸反应法,另一种是焦性没食子酸吸收法。几年来,人们对两种分析方法的准确性曾有过褒贬不一的评论。这里我们也谈谈自己粗浅的观点。2爆炸法测定氢气纯度一定量的氢气样品与适量的空气之均匀混合物因反应后生成液体水而引起气体体积减少,减少的体积等于参加反应气体体积之和。其中l／3为氧气,2／3为氢气。根据氢气取样量和反应前后混气体体积之差,以及氢气在反应中的体积比例关系,可计算出样品的氢气纯度。计算公式式中：A一混…     

HEASUREHENT OF INSTANTANEOUS RATES OF LOSS OF VOIATILE COMPOUNDS DURING DRYING OF DROPS

A novel technique serves to monitor instantaneous rates of loss of a volatile solute from a suspended drop during drying. A highly sensitive electron capture detector is used to monitor concentrations of SF6 released into a flowing gas stream from a suspended, drying drop. Simultaneously, the appearance and morphological development of the drop are monitored with a video camera. This provides the wherewithal of relating instantaneous rates of loss of the volatile solute to particular events during the development of particle morphology.

Initial experiments have been carried out with drops of aqueous solutions of glucose, sucrose, maltodextrin and coffee extract. The results clearly display the onset of the volatiles-retentive selective diffusion phenomenon. There is also substantial loss of the volatile component later in the drying process, when the drops undergo repeated ex ansion, bursting and cratering due to the formation of internaf bubbles. These experiments appear to be the first quantitative demonstration of major losses accompanying changes in drop morphology.     

用两个形状指数表征粉煤灰颗粒形貌的研究

引用两个形状指数表征颗粒形状的概念,即先将颗粒形状近似为椭圆,再将椭圆图像分离:以圆为基准的颗粒宏观形状指数δ;以光滑椭圆为基准的颗粒轮廓凹凸度,即微观形状指数ζ。分析和发展了近似椭圆模型。并运用图像分析仪对粉煤灰、水泥样品进行实验。结果表明,粉煤灰颗粒的两个形状指数δ和ζ都大于水泥颗粒。证明粉煤灰颗粒的球形度、表面光滑度优于水泥,而且,随着粒径增大,δ和ζ呈下降趋势,表明磨制颗粒越粗。(?)粒形状越不规则。文中还运用近似椭圆模型再现了颗粒的模拟图像。     

典型煤碳燃烧特性研究和数值模拟

本文以三种典型煤的碳燃烧为研究对象，分别采用简单一维沉降燃烧方式和等温加热燃烧方式，实验研究了煤在快速加热条件下，其碳的初期和中，后期燃烧过程。以实验为基础，建立了煤的碳燃烧模型，变工况数值模拟了煤的碳燃烧过程，揭示了煤不同条件下的单颗粒碳燃烧特性。     

茶多酚提取方法进展

本文综述了国内外现有茶多酚提取方法的现状以及近期的研究进展，并对其优缺点进行了评价。这将有助于中低档茶的综合利用和茶多酚的进一步开发应用。     

卫生陶瓷烧成用窑炉发展之我见

归纳了当今卫生陶瓷工业的发展现状和水平 ,对窑炉产业提出了的新要求 ,分析了某一新型窑炉的特点 ,对发展我国陶瓷窑炉产业提出了建议     

ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES

Viscosity of Simple Soda-Silicate 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log₁₀ viscosity amounting to 0.6, those of Washburn et al., being relatively too high. If correction for this is made, the isothermal curves of log₁₀ viscosity as a function of soda content are smooth up to 50% Na₂O, showing no inflection. The observations as a function of temperature T are all represented within accidental error by an equation of the type where all three constants vary regularly with the composition. Change of Viscosity of Glass (6SiO₂, 2Na₂O) due to Molecular Substitution of CaO, MgO and Al₂O₃ for Na₂O The effect is clearly brought out by plotting (from the results of English) the change of log₁₀η due to the substitution as a function of temperature. The curves each show a sharp bend at a temperature between 840° and 1050°C, which is designated the aggregation temperature T_a. If we divide these curves by the corresponding percentage substituted, we get curves for each oxide which are straight and parallel below the aggregation temperatures, the slopes (increase of change of log₁₀η per 100°C) being −0.056 (CaO), −0.055 (MgO), −0.018 (A1₂O₃) per per cent oxide substituted. For substitution of 1/2 molecule the slopes are −0.325 (CaO), −0.23 (MgO) and −0.18 (Al₂O₃) per 100°. At the aggregation temperature the change of log₁₀η per per cent is a minimum, 0.03 to 0.06 for CaO, 0.12 for MgO, 0.07 for Al₂O₃. Evidence of Aggregation in Glasses, from viscosity Measurements The sharp bends in the plots of change of log₁₀η due to substitution of an oxide for Na₂O, suggest the beginning of molecular aggregation at these temperatures. These aggregation temperatures are close to the devitrification temperatures, but the effect on the viscosity curves cannot be due to actual devitrification since it does not change with time. Taking the aggregation temperatures as equal to devitrification temperatures, additional isotherms are roughly sketched into the equilibrium triangle of the system Na₂O-CaO-SiO₂. Change of Viscosity of Glass (4SiO₂, 2Na₂O) due to of Substitution of B₂O₃ for SiO₂ The change of log₁₀η (from the results of English) is plotted as a function of temperature, and also the change of log₁₀η per per cent B₂O₃. The curves are more complex than for the substitution for Na₂O.