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对X射线荧光光谱法(XRF)测定锆质耐火材料中二氧化锆的测量不确定度的来源进行分析,并对相应的不确定度分量进行评定,最终给出了扩展不确定度。 相似文献
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本文采用X射线荧光光谱法(XRF)对950铂合金中铂含量进行测试分析,主要分别从标准片、分析样品测试的均匀性、标准曲线的线性关系、测量结果的重现性、样品组成和标准片的不一致性等影响因素来评定测量结果的不确定度。最后得出合成不确定度和扩展不确定度。本方法的建立有利于在实际检测工作中对贵金属含量的判定进行合理的评定。 相似文献
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不确定度可用于对试样加工质量的评估、内检和外检质量评估以及不同分析方法等的质量评估。通过对EDTA滴定法测定铝土矿石中氧化铝的不确定度来源进行分析识别,并对影响不确定度的各分量进行量化,计算合成标准不确定度和扩展不确定度并给出不确定度报告。结果表明,分取试样溶液的体积是最大的不确定度来源。 相似文献
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选用高温预氧化熔片制样,应用理论系数法和散射线内标法校正元素间谱线干扰和基体效应,用X射线荧光光谱法测定铝土矿中硅、铝、铁、钾、钠、钙、镁、磷、钛、锰、硫、锆、锶、钒、铬、镓等16种主次量组分,各相对标准偏差(RSD,n=11)均小于10%,测定值与外检结果吻合. 相似文献
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Matthew L. Fisher Miroslav Colic Masa P. Rao Fred F. Lange 《Journal of the American Ceramic Society》2001,84(4):713-718
The influence of the addition of silica particles (5, 15, 25, and 300 nm) on the zeta potential and viscosity of aqueous alumina slurries (250 nm particles) was investigated in a pH range where the surface charge was positive for alumina and negative for silica. For slurries formulated with the smaller silica particles, the isoelectric point shifted from pH 9.0 to pH ∼3 (depending on the particle size of the silica) with increasing volume fraction of silica particles. At pH 9, the original isoelectric point for the alumina alone, these mixed slurries had a shear-rate-independent, low viscosity (Newtonian behavior). Both of these results show that the smaller (≤25 nm) silica particles adsorb to the surface of alumina. The fraction of silica adsorbed to the alumina surface was dependent on the size of the silica particles, and was consistent with surface coverage calculations based on the effect of surface curvature on the limits of dense random parking. The larger silica particles (300 nm) could not physically cover the surface of the alumina particles, and simply formed a mixed, attractive particle network that exhibited a much higher viscosity with non-Newtonian (viz., shear rate thinning) behavior. 相似文献
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本文简单阐述了硅微粉的分类、应用和性质,分析了硅微粉在氧化铝泡沫陶瓷中的作用及高温反应的结合机理,同时研究了硅微粉对氧化铝泡沫陶瓷浆料性能和制品性能的影响。经试验分析,适量的硅微粉可促进氧化铝泡沫陶瓷的烧结,提高制品的强度,而对氧化铝浆料无不良影响。 相似文献
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采用直接压片成型的方法,建立了一种高硅分子筛中氧化钾的X射线荧光光谱分析方法(XRF)。实验结果表明,该方法线性良好,相关系数r=0.9997;与化学法测定结果比较相对误差小于5.6%;精密度试验RSD值小于2.1%;方法具有良好的准确度和精密度;本方法直接压片测定,具有简单、快速、成本低的优点,能满足企业大批量生产的分析要求。 相似文献
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采用X-射线荧光光谱法测定石灰石中CaO含量,对影响分析结果的主要不确定度分量进行讨论和分析,建立了数学模型。通过对试样称量、测量重复性、标准物质、工作曲线变动和高低标校准引起的不确定度分量的评定,计算了合成标准不确定度和扩展不确定度。评定结果表明,标准物质引起的不确定度对总不确定度影响最大。 相似文献
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Pure Al2 O3 powder compact sintered at 1400°C after adding 100 mol ppm of SiO2 shows grain boundaries that are flat, even across the triple junctions. TEM observations show that these flat grain boundaries are parallel to the basal planes of the grains on one side. These flat grain boundaries must be singular. At such a low SiO2 concentration and a low temperature, it is very unlikely that any liquid phase is present at these grain boundaries to cause such flat boundary shapes. 相似文献
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S. M. Smith R. O. Scattergood J. P. Singh K. Karasek 《Journal of the American Ceramic Society》1989,72(7):1252-1255
Results are presented for the effect of the hot-pressing environment and the oxygen content of Sic whiskers on the fracture toughness of an A12 03 -matrix composite reinforced with 15 vol% Sic. For the composite with Sic whiskers having a 55 at.% oxygen layer, the fracture toughness (Kic ) decreases from 8.03 to 6.64 MPa-m1/2 when the hot-pressing environment is changed from argon to a vacuum of ∼6.7 × 10−2 Pa. The results indicate that the decrease in Klc of the composite is related to the degradation of Sic whiskers by reaction with SiO2 , which is enhanced in a vacuum environment where the reaction products are constantly removed. 相似文献
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以水性纳米二氧化硅溶胶、铝溶胶为成膜材料,用自制的胶凝固化剂,添加消泡剂、流平剂等功能性助剂,组成了新型无机陶瓷质涂料。经检测其具有优异性能:6H以上的高硬度,可在600℃下长期使用,室外耐候可达30 a以上,不燃烧也不助燃,不含有机VOC,不含有毒重金属。 相似文献
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介绍了使用X射线荧光光谱法测定氧化铝陶瓷主次量成分。用熔融玻璃片法制样,此方法简单,迅速,成本低。选用铝土矿GBW07177~GBW07182和GSB04—2606—2010系列标准样品,采用仪器软件SuperQ中提供的飞利浦模式的经验系数(Classic)和基本参数法校正元素间的谱线重叠干扰和基体效应,使用Magix(PW2403)x射线荧光光谱仪对样品中的Al2O3,SiO2,Fe2O3,TiO2,K2O,Na2O,CaO和Mg0共8个元素进行测定,各组分的RSD均小于3.36%,测量结果与计算值的误差在化学分析允许差范围内。 相似文献