共查询到20条相似文献,搜索用时 46 毫秒
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1 引 言1999年中央工艺美院陶瓷系教师曾在龙泉创作一批青瓷作品。青瓷釉色似南宋龙泉粉青和哥窑油灰。据介绍这些作品是采用当地原料和传统配方在龙窑中烧制的。有人提出能否利用北京当地原料或市面上销售的原料 ,在油窑、液化气窑中仿制出龙泉青瓷釉。为此 ,查阅了有关龙泉的出土报告资料和有关部分对龙泉青瓷胎、釉的化学成分进行测试分析的研究报告与论文 ,并对古窑址出土的龙泉青瓷釉片的外观特征和内部结构进行了鉴定和镜下观察分析 ,笔者开始了仿制实验。实验中所用的制釉原料系北京市场和附近陶瓷产区购买的普通原料 ;制胎原料利… 相似文献
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利用能量色散X射线荧光光谱仪,对广州沙边窑出土的窑具、青釉、酱釉瓷进行成分分析.结果显示,样品的胎都使用了含铝较高的原料,窑具中杂质较多,而瓷胎中还含有一定量的钾.瓷釉中的钙和钾含量相近,同为主要助熔剂,所以瓷釉多为钙碱釉.通过与西村窑同类型瓷器样品成分的比较,发现二者虽具有相似的制瓷工艺,但西村窑产品的胎、釉具有明显... 相似文献
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龙泉大窑枫洞岩窑址出土的明代青瓷EDXRF研究 总被引:1,自引:0,他引:1
采用能量色散X荧光光谱(X-ray fluorescence spectrometer,EDXRF)对龙泉大窑枫洞岩出土的一批制作工整、纹样精细、釉色滋润、器形庞大的明代青瓷进行测试,并采用多元统计分析方法对结果进行了分析。从胎、釉化学成分入手,将测试结果与早前测试的北宋、南宋龙泉大窑青瓷以及南宋官窑青瓷瓷片的化学组成进行对比,发现从北宋到明代,龙泉青瓷釉中CaO含量显著下降,K2O+Na2O的含量逐渐增加。明代龙泉青瓷与南宋龙泉青瓷相比,CaO的含量平均下降了6.05%,碱金属氧化物总量平均上升1.51%。从胎体成分上看,龙泉大窑青瓷从南宋到明代制胎原料取用上具有连续性的特点。同时,探讨了釉色成因与化学组成之间的关系。 相似文献
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中国历代南北方青瓷的研究 总被引:4,自引:0,他引:4
本文研究了25种历代南、北方青瓷标本。对青瓷胎、釉的化学组成、显微结构、烧成温度以及显气孔率均作了详细测定和研究。历代越窑青瓷胎的化学组成十分近似于浙江当地瓷石,但钛、铁着色氧化物含量较高。这表明青瓷胎是以瓷石和掺少量高含铁量粘土(紫金土)配制而成。从北方青瓷胎中含Al_2O_3较高推断,北方青瓷的胎主要是采用含铝量高的粘土原料制成,这也是大部分北方青瓷胎常常呈现多孔的原因。从扫描电子显微镜照片上也得到了证实,这些气孔多为开口气孔。 南、北方青瓷釉中的钙含量及其演变规律很相似。五代以前的钙含量为15~20%,北宋以后降低到15%以下,而钾、钠含量则有所增加,显示了北宋以后由石灰釉演变成石灰-碱釉的巨大进展。南北方青瓷釉中钛铁着色氧化物的含量也比较接近。然而,该两类釉的着色色调郤不十分相同,除与钛铁含量有关外,主要由于烧成气氛和基釉组成不同的缘故。 大部分青瓷釉中均含有少量P_2O_5,并随CaO含量成比例增长。作者认为这可能与当时使用了部分动物性骨质原料有关。广西永福窑釉呈深豆绿色,这是釉中所含铜、铁混合着色的效果。釉中CuO含量为1.25%。 物性测试结果表明,东汉晚期越窑青瓷的瓷化程度都很高,其显气孔率在0.5%以下,扫描电子显微镜只发现一些闭口气孔,从物理 相似文献
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位于安徽淮南市上窑镇等地的寿州窑是古代著名的窑口,以烧制黄釉瓷著称于世。实验采用能量色散X射线荧光光谱仪(EDXRF)对安徽寿州窑考古发掘出土的59件黄釉瓷标本的胎釉组成进行了测试分析。结果表明寿州窑出土黄釉瓷胎体符合北方瓷器胎体特征,即采用了高岭土类原料制胎;寿州窑黄釉属于高钙釉,但未采用南方以唐代越窑青瓷为代表的制胎原料与钙质原料混合的釉料配方,而采用或借鉴了北方地区的制釉技术。从科学技术角度揭示了唐代寿州窑瓷器的胎釉原料与制瓷技术特征,这对于补充和完善中国古陶瓷科技发展史具有非常重要的意义。 相似文献
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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… 相似文献
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P. P. Budnikoff 《Journal of the American Ceramic Society》1924,7(11):817-820
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. 相似文献
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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. 相似文献
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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. 相似文献
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. 相似文献
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ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES 总被引:5,自引:0,他引:5
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 Ta. 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. 相似文献
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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。 相似文献