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ballack315629金虫 (著名写手)
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[求助]
弱问，理论密度theoretical density 是不是就是真密度true density
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| 弱问，理论密度theoretical density 是不是就是真密度true density。 球磨后用Helium pycnometry测出的密度，是不是就是理论密度。[ Last edited by ballack315629 on 2012-4-15 at 19:29 ] |
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2012-04-15 19:29:00, 443.12 K
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【答案】应助回帖
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Absolute powder density: The mass of powder per unit of absolute volume Apparent particle density: The mass of a particle divided by its apparent (particle) volume Apparent powder density: The mass of a powder divided by its apparent volume Bulk density: (also called Bulk powder density): The apparent powder density under defined conditions . The mass of the particles divided by the volume they occupy that includes the space between the particles The ratio of the mass of a collection of discrete pieces of solid material to the sum of the volumes of: the solids in each piece, the voids within the pieces, and the voids among the pieces of the particular collection Effective particle density: The mass of a particle divided by its volume including open pores and closed pores Envelope density: The ratio of the mass of a particle to the sum of the volumes of: the solid in each piece and the voids within each piece, that is, within close-fitting imaginary envelopes completely surrounding each piece The ratio of the mass of a particle to the envelope volume of the particle Skeletal density: The ratio of the mass of discrete pieces of solid material to the sum of the volumes of: the solid material in the pieces and closed (or blind) pores within the pieces Tap density (also called Tap powder density): The apparent powder density obtained under stated conditions of tapping Theoretical density: The ratio of the mass of a collection of discrete pieces of solid material to the sum of the volumes of said pieces, the solid material having an ideal regular arrangement at the atomic level True density (also called True particle density); The mass of a particle divided by its volume, excluding open pores and closed pores |
11楼2012-10-27 19:42:36
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3楼2012-04-14 00:03:29
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ballack315629(金币+1): 谢谢参与
tjcdp: 金币+1, 鼓励热心回复！ 2012-04-21 17:51:20
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ballack315629(金币+1): 谢谢参与
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zhangquan8385: 金币+1, 鼓励 2012-04-23 07:57:43
zhangquan8385: 回帖置顶 2012-04-23 07:57:46
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首先，理论密度和真实密度完全不一样。 其次，你所说的Helium pycnometry是怎么操作的，能说具体一点吗。 陶瓷材料密度有如下几种表示： 1. 结晶学密度。指由原子组成的没有缺陷的连续晶格计算出来的理想密度。 2. 理论密度。与结晶学密度同义，但考虑了固溶体和多相。 3. 体积密度。陶瓷体实际测出的密度，包括陶瓷内部所有的晶格缺陷，各种相组成和制造中形成的气孔。 4. 相对密度。指陶瓷实测体积密度与其理论密度比值的相对百分数。 前两种密度是指陶瓷材料内没有缺陷的理想情况，意味着制造过程形成的气孔为零，所以在结构内的原子间只有间隙。 在制造中形成的缺陷和气孔的情况下，通常使用体积密度或相对密度。 结晶学密度或理论密度可以从晶体结构数据（晶胞参数）和所含元素的相对原子质量通过计算得到。 对于坯体的体积密度测量： 烧结后的陶瓷体体积密度通常采用排水法，按阿基米德定律计算出来。 烧结前的陶瓷素坯用排汞法测量。 |
4楼2012-04-14 05:34:18