共查询到19条相似文献,搜索用时 62 毫秒
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光透法是一种基于沉降原理,即利用一束平行光透过悬浮液时产生的光的衰减进行粒度分布测量的方法。由国家标准总局和冶金部标准化研究所授命上海钢铁研究所负责起草的金属粉末粒度分布的测定——光透 相似文献
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经改进的光透法测试粉末粒度计算方法的原理是:同种粉末各不同粒径颗粒在特定的条件下有它固定的沉降高度。把这个固定的沉降高度制成"温度-沉降高度曲线板",使曲线板上各点依次对应于由仪器记录下来的粉末沉降曲线。这样,可以很简便地读出所需各粒径的透光量。此方法省去了为确定被测试粉末所需各粒径的沉降高度而进行的繁琐计算过程,可节省计算及采集数据点时间的80%左右,且精度高、差错少。 相似文献
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选用顶击式振筛机及拍击式振筛机对氟化铝粒径分布进行测定,通过试验确定了合适的筛分时间,同时对用筛尺寸进行了推选。采用该法测定数据稳定,重现性好。 相似文献
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Fe—10%Ni—0.2%M(M为Ti和Al)及Fe—10%Ni—0.025%Al—0.1%Ti—0.02%N合金,经化学或电解提取,用单粒子光读法超定了过滤薄膜上氧化或氮化物夹杂的空间粒度分布。用单粒子光读法超定的粒度分布,与用带电子探针微区分析的扫描电镜,三维观测过滤器薄膜上的粒子得到的结果进行了比较。由单粒子光读法和带电子探针微区分析的扫描电镜超出的粒子体积分数和化学分析计算出的体积分数进行了比较。发现,尤其是在检阅dv>5μm的粒子粒度分布时,单粒子光读法要比带电子探针微区分析的扫描电镜观超法优越。 相似文献
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ICP—AES法快速测定金属钴粉中的九种杂质元素 总被引:2,自引:0,他引:2
文章采用iCAP6300型ICP光谱仪测定多种元素。以硝酸(1+1)溶解金属钴粉,用钴基体匹配,选择合适的背景校正方法和各元素最佳波长,用水平观测方式同时测定金属钴中的镁、铝、铜、锌、铁、铅、硅、锰、镍九种杂质元素含量。其检出限分别为/μg·g-1:0.34、0.17、0.21、0.18、0.19、0.24、0.16、0.14、0.29,相对标准偏差小于5%,标准加入回收率为92%~104%。该方法快速简便,准确度高,适用于生产分析。 相似文献
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采用光子相关光谱法测定硫酸钛白工艺中水解偏钛酸的粒度分布,研究了不同分散方法和测试条件对测定结果的影响。通过研究分散介质、分散剂及其用量,偏钛酸用量,超声分散时间及稳定时间等分散方法和测试条件,得到光子相关光谱法测定偏钛酸粒度分布的适宜分散条件。试验结果表明:采用蒸馏水为分散介质,分散剂六偏磷酸钠浓度为0.05%,50 mL分散水解偏钛酸浆料0.044 g左右,超声分散5 min后立即测定其粒度分布,此为光子相关光谱法测定水解偏钛酸粒度的最佳分散测试条件。 相似文献
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Particle Size Distribution of Lunar Soil 总被引:1,自引:0,他引:1
Meteorite impact on the lunar surface produces a consistent, broadly graded soil. In this note, the geotechnical and geological systems are compared to characterize lunar soil. In geotechnical terms, the lunar soil particle size distribution is described as sandy silt/silty sand, well-graded. In geologic terms, it is described as very fine sand, very poorly sorted, nearly symmetrical, and mesokurtic. Because of its broad particle size distribution, lunar soil may be internally erodible. 相似文献
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采用干筛分法、 激光衍射法和扫描电子显微镜法测试了粉末涂层材料的粒度, 对比了不同方法的测试结果,
研究了粉末材料的形貌对粒度测试的影响。 结果表明: 干筛分法测试球形的粉末、 不规则形粉末、 片状粉末的粒
度分布具有较好的重复性; 三种方法测试的结果相差较大, 且粒度越大, 差异越大。 相似文献
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铼粉作为铼制品的基础原料,其压制性能是影响产品质量和服役性能的关键因素之一。分别以4种不同粒度的铼酸铵作为原料,通过两步氢还原法制得铼粉,后续以场发射扫描电镜(SEM)、 X射线衍射仪(XRD)、费氏粒度仪、粉体物性仪等设备,表征和测试粉体的微观形貌、物相、粒度以及物性指标,进而综合研究粒度对铼粉压制性能的影响规律。结果表明:铼酸铵粒度变小对前驱体粉的微观形貌影响很大,粉体整体从颗粒状演变为片状,最终呈树枝状;同时铼酸铵的粒度降低使制得铼粉的费氏粒度和激光粒度皆变小(最低为2.53μm和24.1μm),振实密度和填充密度也相应降低,进而使粉体的压制性能得到改善。 相似文献
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Yingxia Li Sim-Lin Lau Masoud Kayhanian Michael K. Stenstrom 《Canadian Metallurgical Quarterly》2005,131(9):1267-1276
Particles in highway runoff contain various sorbed pollutants, and many best management practices (BMPs) are selected for particle removal efficiency, which makes particle size distribution a crucial BMP design parameter. Particles between 2 and 1,000?μm in diameter were quantified for three rainfall events during the 2002–2003 rainy season at three highway sites in west Los Angeles. Rainfall, runoff flow rate, and a large suite of water quality parameters were also measured. An experimental protocol was developed for bottle cleaning, sample storage, and mixing that provided repeatable results. Particle aggregation occurred which required samples to be analyzed in less than 6?h; the concentration of small particles decreased with a corresponding increase in the concentration of larger particles in stored samples. The particle concentration decreased as the storm progressed and the number of large particles decreased more rapidly than the total number of particles. Particles demonstrated a strong first flush. On average, 40% of the particles were discharged in the first 20% of the runoff volume. 相似文献
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Bingqiao Yang Alejandro Lopez-Valdivieso 《Mineral Processing and Extractive Metallurgy Review》2013,34(3):208-215
In this work, the contact angles of molybdenite powders in various size fractions (+150 μm, ?150 + 75 μm, ?53 + 38 μm, ?38 + 20 μm, and ?5 μm) were determined with the Washburn method by measuring the mass of capillary rise liquids in molybdenite powder beds as the function of time. It was shown that molybdenite powders had a smaller contact angle in superfine size range (?5 μm) than the common size range (+20 μm), which might be attributed to the large decrease of the face/edge ratio on molybdenite surfaces. Also, it has been found that the contact angle of molybdenite particles did not change as the decrease of particle size in the range of +20 μm. 相似文献