发布网友 发布时间:2022-04-25 19:40
共3个回答
热心网友 时间:2022-06-16 19:33
卡尔指数一词是从英文ASTM D6393国际标准而来的。是汇美科HMKFlow 6393衡量粉体流动性的综合指数,包括以下10个指数:卡尔休止角Carr Angle of Repose、卡尔崩溃角Carr Angle of Fall、卡尔差角Carr Angle of Difference、卡尔松装堆密度Carr Loose Bulk Density、卡尔紧实堆密度(也称振实密度)Carr Packed Bulk Density or Tap Density、卡尔压缩度Carr Compressibility、卡尔凝集度Carr Cohesion、卡尔均齐度Carr Uniformity、卡尔抹刀角Carr Angle of Spatula、卡尔分散度Carr Dispersibility。
卡尔指数能反映粉体的压缩度。(压缩度)由以下公式计算而得C=100rac{V_B-V_T}{V_B},其中VB指定量粉体自由填充容器的体积,VT是指相同粉体振实后的体积。卡尔指数在制药行业应用广泛,能反映粉体的流动性能。如果(压缩度)大于25%则意味着粉体流动性差,如果小于15%表示流动性好。卡尔指数与豪斯纳比有关系,豪斯纳比由另一公式计算得出。
拓展资料:卡尔指数的计算对象
1、差角:休止角与崩溃角之差称为差角。差角越大,粉体的流动性与喷流性越强。
2、压缩度:同一个试样的振实密度与松装密度之差与振实密度之比为压缩度。压缩度也称为压缩率。压缩度越小,粉体的流动性越好。
3、空隙率:空隙率是指粉体中的空隙占整个粉体体积的百分比。空隙率因粉体的粒子形状、排列结构、粒径等因素的不同而变化。颗粒为球形时,粉体空隙率为40%左右;颗粒为超细或不规则形状时,粉体空隙率为70%~80%或更高。
热心网友 时间:2022-06-16 19:33
Carr提出了一种反映粉粒流动性的简便方法。将一定量的粉粒在无任何振动的条件下填装在量筒中,从粉粒的重量和体积计算出其初始松密度Do,通过振动量筒至粉粒体积达恒定(振动频率一般为50~60Hz,振幅为0.05~0.06mm,振动时间1min),计算此时的压缩松密度Df,压缩指数((Carr指数)即为:
热心网友 时间:2022-06-16 19:34
不好意思啊,找到英文的,不会翻译吖。。
The Carr index is an indication of the compressibility of a powder. It is calculated by the formula C=100\frac{V_B-V_T}{V_B}, where VB is the freely settled volume of a given mass of powder, and VT is the tapped density of the same mass of powder. It can also be expressed as C=100\times(1-\frac{\rho_B}{\rho_T}), where ρB is the freely settled bulk density of the powder, and ρT is the tapped density of the powder.
The Carr index is frequently used in pharmaceutics as an indication of the flowability of a powder. A Carr index greater than 25% is considered to be an indication of poor flowability, and below 15%, of good flowability.[1]
The Carr index is related to the Hausner ratio, another indication of flowability, by the formula C=100\times(H-1).
参考资料:http://en.wikipedia.org/wiki/Carr_index