探究温度制度对制备ZrSiO4-CdSxSe1-x包裹色料的影响

笔者研究了化学共沉淀法制备ZrSiO4-CdSxSe1-x包裹色料的工艺,进一步探究了温度制度（煅烧温度、升温速率和保温时间）对其合成的包裹色料的影响,并利用扫描电镜、色差仪对实验样品进行表征和分析。实验表明：当煅烧温度为950℃时,升温速率为30℃/min,保温时间为40min,色料在透明釉的呈色效果最佳,色度值坐标...     

甘氨酸燃烧法制备红色YAl1-xCrxO3色料与表征

采用甘氨酸燃烧法合成了新型红色YAl1-xCrxO3色料。研究了Cr掺杂量,煅烧温度、保温时间以及矿化剂对YAl1-xCrxO3色料的颜色的影响。结果表明YAl1-xCrxO3色料的色度中的a*值随着Cr掺杂量的增加,煅烧温度的提高和保温时间的延长而增加,色料的红色增加明显。b*值具有与a*值相同的变化规律,其变化的原因是部分Cr3+向Cr4+转变。矿化剂Ca F2具有较好的矿化效果。在1300℃煅烧3 h,能够获得大红色高温YAl0.97Cr0.03O3色料(L*=55.26,a*=26.74,b*=17.44)。     

烧成制度对溶胶-共沉淀合成锆镨黄色料的影响

采用溶胶-共沉淀法合成锆镨黄色料,分别探讨了煅烧温度、升温速率和保温时间对合成色料的物相组成、显微形貌与色度值的影响。实验结果表明:以4℃/min的升温速率煅烧至750℃并保温时间1 h,合成的色料性能最佳,此时主晶相为硅酸锆,还有少量的二氧化锆;煅烧温度和保温时间的增加致使硅酸锆含量先增加后减少,色度值随着硅酸锆含量的变化也先提高后降低;而随升温速率的提高,硅酸锆的含量增加,并在8℃/min时完全转化为硅酸锆;随温度、升温速率和保温时间的增加,部分硅酸锆晶体的显微形貌由颗粒状发育为块状和柱状。     

棕色尖晶石色料的微波合成与呈色性能研究

以Fe2O3、MnO2、Cr2O3等为原料,采用微波加热法合成了棕色尖晶石色料.讨论了合成温度及保温时间对合成产物物相组成、显微结构和呈色性能的影响.研究结果表明微波合成过程中,1100℃下保温10 min就可得到晶粒尺寸较小、形貌规整、分布均匀且呈色性能较好的棕色色料,其主晶相为Mn1.5Cr1.5O4、MnFe2O4和Mn3O4;合成温度的升高和保温时间的延长,可使色料的红度值a*增加、明度值降低,但保温时间过长又会影响色料的呈色质量.本文的实验表明,1100℃,保温10 min的条件所制备的色料呈色性能最佳.     

包裹镉硒红色料的研制

本研究主要采用沉淀法制备包裹镉硒红颜料,研究了Zr:Cd:S:Se质量配比、矿化剂用量、烧成制度、保温时间等因素对产品性能的影响。实验结果表明,当Zr:Cd:S:Se=17.1:5.4:7.3:1(质量比)、矿化剂LiF添加量为3%、预热到煅烧温度再加入粉料、保温时间30min、色料过325目筛时,可获得理想的包裹镉硒红色料。     

煅烧和消化工艺对白云石活性的影响

以白云石为原料,采用柠檬酸测定法,通过控制煅烧温度、保温时间、消化温度和消化时间等因素,研究了煅烧和消化工艺对白云石活性的影响及最佳的煅烧和消化条件.结果表明:煅烧温度为950℃,保温时间为1.5 h时,煅烧产物中的氧化镁活性最好;以最佳煅烧条件下得到的白云灰粉进行消化反应,消化温度为80 ℃、消化时间为30 min时,得到的消化产物活性最高.工艺简单、操作方便,对进一步利用白云石制备氢氧化镁和氧化镁产品具有重要的参考价值.     

溶胶-凝胶共沉淀法制备硅铁红色料

采用溶胶-凝胶共沉淀法制备了硅铁红陶瓷色料,并且用色度测量仪、扫描电镜、透射电镜和XRD仪等分析手段对色料进行了表征。研究了Si/Fe摩尔比、合成溶液pH值、煅烧温度和矿化剂对色料颜色的影响。结果表明：随着硅铁比和煅烧温度的增加,色料的红度减小;随着pH值的增加,色料的红度值增加,当pH为10时,色料的红度值达到28.93;矿化剂的加入有利于色料的呈色,其效果与加入量有关,加入量低于3wt%时以LiF效果最好,加入量高于3wt%时以NaF效果最好。     

煅烧和消化工艺对白云石活性的影响

以白云石为原料,采用柠檬酸测定法,通过控制煅烧温度、保温时间、消化温度和消化时间等因素,研究了煅烧和消化工艺对白云石活性的影响及最佳的煅烧和消化条件。结果表明:煅烧温度为950℃,保温时间为1.5 h时,煅烧产物中的氧化镁活性最好;以最佳煅烧条件下得到的白云灰粉进行消化反应,消化温度为80℃、消化时间为30 m in时,得到的消化产物活性最高。工艺简单、操作方便,对进一步利用白云石制备氢氧化镁和氧化镁产品具有重要的参考价值。     

煅烧温度与保温时间对合成莫来石材料结构与性能的影响

本研究是利用铝型材厂污泥与叶腊石合成莫来石材料.主要探讨煅烧温度和保温时间对莫来石合成料中形成的晶相、微观形貌及其含量的影响;从中确定较佳的煅烧温度和保温时间.采用XRD法和SEM法表征各试样形成的晶相和显微结构;用Rietveld Quantification 法确定各试样中各晶相的含量.实验结果表明不同煅烧温度和保温时间各试样形成的主晶相都是莫来石固溶体(Al4.59Si1.41O9.7),确定较佳煅烧反应温度为1600 ℃,较佳煅烧保温时间为3 h,对应的莫来石固溶体含量为96.4wt%.     

煅烧石膏活性的试验研究

通过对影响煅烧石膏活性的主要因素最佳煅烧温度、保温时间、外加剂等条件及作用机理进行的试验和研究,认为煅烧石膏作为活性激发剂时,其煅烧温度应在其品型转变温度范围内;保温时间的选择应由石膏品型转变的类型确定少量外加剂能提高煅烧石膏的活性.     

硅铬绿色料中矿化剂的研究

采用固相法合成硅铬绿色料并对色料进行了XRD测试，讨论了矿化剂对色料呈色的影响和矿化剂对色料的作用机理，确定了比较适合的矿化剂种类和用量。     

水温及浸泡时间对日照绿茶氨基酸含量影响的研究

实验主要研究了水温及浸泡时间对日照绿茶中氨基酸含量的影响。研究表明:水温90℃,浸泡时间30min时,日照绿茶中氨基酸含量较高。     

超声共沉淀法制备硅铁红陶瓷颜料

采用超声共沉淀法制备了硅铁红包裹型陶瓷颜料 ,采用X射线衍射、颜色测量、光学显微镜观察等分析手段对颜料进行了表征。研究了超声频率、超声作用时间、Si/Fe比、热处理温度以及矿化剂加入对颜料包裹率以及颜色的影响规律。结果表明 :超声波作用频率提高、时间延长以及配比中Si/Fe比的提高和矿化剂的加入有利于提高颜料中氧化铁的包裹率 ,但其对颜料的颜色的影响不大。煅烧温度的提高可以明显提高颜料的包裹率和明度 ,但在一定程度上降低了颜料的红度值     

氧化铬绿解毒研究

主要研究了由工业铬酸酐高温煅烧制得的氧化铬绿颜料用还原剂AJ03干法解毒的过程,以及还原剂用量、反应温度和反应时间对氧化铬绿解毒效果的影响。结果表明,还原剂AJ03加入量为铬酸酐质量的0.5%时,在1 100 ℃以上至少高温煅烧4 h,氧化铬绿颜料中水溶铬质量分数可降至5.0×10^-5以下,具有良好的解毒效果。     

微波辅助提取牛蒡叶中绿色素及稳定性研究

采用微波提取法从牛蒡中提取绿色素，在单因素实验基础上，通过正交试验优化提取工艺条件。实验结果表明，以无水乙醇为提取剂，料液比为20：1，微波功率为500W，微波作用时间为90s，提取温度75℃，在此条件下绿色素提取效果最佳。各因素对牛蒡中绿色素提取率的影响为：乙醇体积分数〉料液比〉提取温度〉微波功率〉微波作用时间。对牛蒡中绿色素的稳定性进行考察，结果表明，温度对牛蒡中的绿色素影响不大；不同pH对牛蒡中绿色素稳定性几乎无影响；A1^3＋、Cu^2＋、Mg^2＋、Zn^2＋对牛蒡中绿色素的稳定性影响较大，而Fe^3＋对牛蒡中绿色素的稳定性影响较小；氧化剂对牛蒡绿色素的稳定性基本无影响，还原剂对牛蒡绿色素的稳定性影响较大。     

铬酸钠氢还原烧结法制备氧化铬绿颜料

提出了一种氧化铬绿颜料的全新制备工艺。通过研究在低温氢还原过程和烧结过程中影响氧化铬颜料性能的关键因素及其作用机理,制备出性能优异的氧化铬绿颜料。结果表明,低的氢还原温度和相应Al添加剂有利于得到高质量的氧化铬绿颜料;氧化铬的烧结机制为蒸发-凝聚;此外,副产物以NaOH形式回收。该工艺基于中国科学院过程工程研究所自主研发的铬盐清洁工艺与集成技术,实现了氧化铬绿颜料的短流程清洁生产。     

Slip Casting of Yttria-Stabilized Tetragonal Zirconia Polycrystals

The rheological and casting parameters of 3-mol%-yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) powder obtained by a wet-chemical coprecipitation route have been studied. Colloidal stability has been studied through zeta potential measurements. An organic surfactant has been used as deflocculant. Viscosity, casting rate, and green densities have been determined for suspensions with 28.2, 33.6, and 40.3 vol% solids content. Relative density, grain size, and t -ZrO₂ evolution versus temperature and soaking time are also reported.     

Colour development of red perovskite pigment Y(Al,Cr)O3 in various ceramic applications

Abstract

Ceramic pigments based on the perovskite structure develop a promising red hue and furthermore present no environmental or health problems. Pigment colouring efficiency was tested in different ceramic applications, both in the body and in glazes. Final products, with variations in both maximum firing temperature and soaking time, were characterised by colorimetry. The investigation focused on the factors and mechanism influencing perovskite dissolution by calculating phase compositions of different ceramic matrices and observing pigment microstructure. Pigment powders were also characterised by structural analysis and spectroscopy. Pigment dissolution was only slightly affected by the firing cycle, mostly being governed by the amount and chemical composition of the liquid phase. In particular, the larger the content of chemically aggressive components such as calcium, magnesium, zinc and lead oxides, the stronger and faster the pigment dissolution.     

Influence of crystallinity on chromatic parameters of enamels coloured with malayaite pink pigments

Chromium-doped malayaite ceramic pigments, CaSnSiO₅:Cr were obtained by solid state reaction using CaCO₃, SnO_2, SiO₂ and PbCrO₄ as precursors. The synthesis process was studied by means of thermal analysis and mass spectroscopy, the results evidencing the volatilization of carbon dioxide and lead in a large temperature range. The major aim of the study was to evaluate the dependence of the pigment colour and crystallinity from the soaking time at a maximum synthesis temperature fixed at 1400 °C. X-ray diffraction data indicate a nearly linear tendency of crystallinity increase with increasing soaking time. The colour of glazes prepared with the pigments, which was monitored by measuring their chromatic coordinates, presents a clear tendency of improvement with increasing crystallinity. This was interpreted in terms of decreasing solubility of the pigments as their crystallite size is increased. SEM and EDX studies confirm that hypothesis, evidencing very small dissolution of the highly crystallized pigments in the glaze.     

Synthesis of high near infrared reflection wurtzite structure green pigments using Co-doped ZnO by combustion method

A high near-infrared reflective green pigment with a low cobalt content, Zn_0.96Co_0.04O, was prepared by solution combustion synthesis. The pigment was characterized by XRD, SEM, TG-DSC, UV–vis and CIE L*a*b*C*h* colorimetric. The resulting green pigment showed that the chromaticity performance is better. The doping Co did not affect the main crystalline structure, all samples were retained ZnO wurtzite structure. The better green hue is a* = ?15.35 and achieved a near-infrared reflectivity up to 40%, when CoO content was x?=?0.04, combustion agent was glycine, calcination temperature was 1000?°C. The synthesized pigments have a better thermal stability, chemical stability and a small amount of cobalt oxide (2.8?wt%), and the preparation process is simple. Therefore, the green pigment of ZnO wurtzite structure has great potential in serving as cool pigments for building coatings.