尖晶石型钴蓝颜料的研究进展

介绍了尖晶石型钴蓝颜料的结构和显色机理,结合纳米材料的制备方法,综述了近年来钴蓝颜料制备方法及工艺,主要有固相反应法、液相反应法、气相法.其中固相反应法生产工艺简单,是目前工业生产常用方法,但制备的颜料粒径、色泽、稳定性等性能不能充分满足市场需求;液相反应法与气相法均可制成高品质的钴蓝颜料,但工艺复杂、成本较高.最后对钴蓝颜料的应用和发展作了简要介绍.     

三元硼化物陶瓷涂层的制备及其力学性能研究

笔者采用的是在Q235钢基体表面用固相反应法制备三元硼化物陶瓷涂层,因为固相反应法制备陶瓷消耗的能源少、污染小、工艺简单,相对传统的制备工艺所需成本较低,所以研究固相反应型三元硼化物陶瓷涂层有很高的科学价值和实用价值。笔者采用Fe-B、Mo、Fe、Al、Cr为陶瓷骨料,使用无机粘结剂磷酸二氢铝作为陶瓷涂层的粘结剂来制备三元硼化物陶瓷涂层,对这种制备陶瓷涂层的工艺做基础性的研究。研究主要有:陶瓷涂层配比研究,陶瓷骨料配比,陶瓷骨料与磷酸二氢铝粘结剂最佳配比;固相反应法制备三元硼化物陶瓷涂层工艺:Q235钢基体表面预处理,固化温度,固化工艺等;涂层结构与性能研究:对涂层的致密性、显微组织、相组成、涂层与基体的结合强度、涂层抗热震性能、涂层的耐磨性进行了研究。     

两种方法制备BaTiO3陶瓷组织性能比较

制备钛酸钡粉体主要有两种方法,目前还没有文献对两种制备方法进行系统比较,本文采用两种方法即溶胶凝胶法和固相反应法制备钛酸钡粉体,并对粉体的微观形貌和相组成进行比较分析,结果表明两种方法均能成功制备钛酸钡粉体,而溶胶凝胶法制备的粉体由于颗粒细小均匀,因此性能优于固相反应法制备的粉体.分别将两种方法所得粉体经成型烧结制备陶瓷,并对其进行性能检测和微观形貌观察,结果表明采用溶胶凝胶法所得粉体制备的陶瓷由于晶粒发育良好、结构紧密及气孔较少.因此具有较高的体积密度及优良的PTc性能,其体积密度p=3.11g/cm3,室温电阻率p=60Ω·cm,电阻温度系数α25=1 6.7%·℃-1.     

Nd：GGG多晶原料的制备与表征

采用固相反应法制备了Nd:GGG晶体原料.XRD测试结果表明,固相反应法合成Nd:GGG原料的最佳温度为1300 ℃;扫描电镜观察发现,粉体颗粒呈球形,平均粒径约为1 μm;荧光性能的分析表明,荧光发射的最强峰位于1061.54 nm处,是Nd3+4F3/2-4I11/2跃迁产生的荧光发射.     

钴蓝颜料的研究与开发

笔者对尖晶石型钴蓝颜料的结构和显色机理做了介绍,并对钴蓝颜料的制备方法加以综述。其制备方法主要有固相反应法、液相反应法,其中固相反应法是目前工业生产的常用方法。实验中根据钴蓝颜料的结构与显色机理在配方中引入氧化锌,研究氧化锌对于钴蓝颜料呈色以及烧成温度的影响。最终确定合理配方,节约了氧化钴资源,同时烧成温度也降低了,减少了天然气能量消耗,达到了低碳的目的。     

无水钨酸钾的合成研究

以碳酸钾和三氧化钨为原料，用高温固相反应法和水溶液法分别合成了无水钨酸钾。在高温固相反应法中，采用热分析法来指导产物的合成，用XRD物相分析手段对合成条件进行了研究。在水溶液法中，对制备的产物进行了XRD分析和热分析表征，XRD表明水溶液法合成的产物易形成（001）取向。研究及理论分析表明，水溶液法是制备高纯度产物的更有效的方法。     

尖晶石相锂锰氧化物合成工艺的研究进展

尖晶石相锂锰氧化物具有价格便宜、性能优良和无毒等特点,已成为锂离子电池正极材料应用的重要发展对象,近年来已获得了较广泛的重视,并且取得了许多成果。重点介绍了尖晶石相锂锰氧化物的主要合成方法,如固相反应法、软化学法等,并对它们的原理、优势和缺点进行了简单的介绍和讨论,对锰酸锂合成工艺的未来发展和走向作了简单的展望。     

固相反应法玻璃质陶瓷涂层的制备及性能研究

本文采用固相反应法在Q235钢表面制备陶瓷涂层,并在陶瓷骨料中添加Bi2O3-B2O3-SiO2系低熔点玻璃粉以促进反应及提高性能。试验表明:同系列不同软化温度玻璃粉加入之后对涂层各种性能的提高程度不同。     

锆英石矿粉合成无机颜料的研究

本文介绍了采用“高温固相反应法”利用矿石粉制备锆质颜料的工艺方法,用本方法制备颜料比用我国目前惯用方法,其产品成本可成倍降低,而质量可达到国内同类产品水平。     

湿化学法制备Pb(Zrx Ti1-x)O3超细粉体的研究进展

介绍了锆钛酸铅(PZT)陶瓷的特性及应用，以及用超细粉体制备PZT陶瓷与传统的固相反应法相比所具有的优点。对目前常用的几种制备PZT超细粉体的湿化学方法作了详细综述。     

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…     

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.     

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.     

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.     

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。     

几种针状焦性能对比

针状焦分石油系和煤系两大类,这主要取决于针状焦的原料来源。在同一系列中由于原料不同和工艺条件不同 ,针状焦的各自性能也不相同。针状焦是生产超高功率石墨电极和高功率石墨电极的主要原料 ,针状焦的性能对石墨电极的质量有至关重要的影响。所以对针状焦性能以及其对石墨电极质量影响的研究十分必要的。以下是常用的几种进口针状焦和国产针状焦的性能对比。１原料性能分析对比原料试样包括４种针状焦 ,其中两种为进口针状焦：三菱针状焦和新日化针状焦;另两种为国产针状焦：鞍山针状焦和锦州针状焦。其中除锦州针状焦是石油系针状焦外…     

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.     

环氧树脂羟基值测定方法的研究

利用乙酸酐、吡啶和浓硫酸混合的乙酰化试剂测定环氧树脂中羟基值含量的方法具有操作简便、滴定终点明显和分析结果误差小等优点。     

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。     

聚酰亚胺的合成法

本文评述了缩聚型聚酰亚胺的主要合成方法和近年来国际上在合成中所做的探索。