A detection method of powder equivalent diameter

A technology of equivalent diameter and detection method, applied in measurement devices, particle size analysis, scientific instruments, etc., can solve problems such as the lack of a unified detection method for equivalent particle diameter and the unclear equivalent calculation model, and to overcome the problems of agglomeration and surface Defects, shortened inspection cycle, high precision effect

Active Publication Date: 2018-06-01
舜典仪器(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using the gas adsorption method, the equivalent calculation model for isothermal physical adsorption is not yet clear, and the equivalent particle size directly obtained by isothermal physical adsorption instrument has not yet formed a unified detection method

Method used

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  • A detection method of powder equivalent diameter
  • A detection method of powder equivalent diameter
  • A detection method of powder equivalent diameter

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A method for detecting the equivalent diameter of powder. The concrete steps of detection method described in the present embodiment are:

[0039] The first step, take a clean and dry sample tube, and measure the mass of the sample tube as m 0 =18.5881g; then take 0.0500-2.0000g of the powder to be tested and put it into the sample tube. The powder to be tested is Al 2 o 3 Powder, Al 2 o 3 The diameter of the powder is <0.1mm.

[0040] In the second step, the Al 2 o 3 The powder sample tube is fixed in the degassing station of the isothermal physical adsorption instrument, and degassed for 14-24 hours under the conditions of a vacuum of 0.05-0.2 Pa and a temperature of 100-200 °C.

[0041] Step 3: Cool the degassed sample tube to 25-35°C, and then backfill the cooled sample tube with high-purity nitrogen to normal pressure.

[0042] Step 4: Remove the sample tube backfilled with high-purity nitrogen from the degassing station of the isothermal physical adsorpti...

Embodiment 2

[0058] A method for detecting the equivalent diameter of powder. The concrete steps of detection method described in the present embodiment are:

[0059] The first step, take a clean and dry sample tube, and measure the mass of the sample tube as m 0 =15.7910g; then take 0.0500-2.0000g of the powder to be tested and put it into the sample tube. The powder to be tested is iron ore powder, and the diameter of the iron ore powder is less than 0.1mm.

[0060] In the second step, the sample tube containing the iron ore powder is fixed in the degassing station of the isothermal physical adsorption instrument, and degassed for 9-19 hours under the conditions of a vacuum degree of 0.05-0.2 Pa and a temperature of 150-250°C.

[0061] Step 3: Cool the degassed sample tube to 25-35°C, and then backfill the cooled sample tube with high-purity nitrogen to normal pressure.

[0062] Step 4: Remove the sample tube backfilled with high-purity nitrogen from the degassing station of the isoth...

Embodiment 3

[0078] A method for detecting the equivalent diameter of powder. The concrete steps of detection method described in the present embodiment are:

[0079] The first step, take a clean and dry sample tube, and measure the mass of the sample tube as m 0 =14.5989g; then take 0.0500-2.0000g of the powder to be tested and put it into the sample tube. The powder to be tested is elemental Al powder, and the diameter of the elemental Al powder is less than 0.1 mm.

[0080] In the second step, the sample tube containing the elemental Al powder is fixed in the degassing station of the isothermal physical adsorption instrument, and degassed for 4-14 hours under the conditions of a vacuum degree of 0.05-0.2Pa and a temperature of 200-300°C.

[0081] Step 3: Cool the degassed sample tube to 25-35°C, and then backfill the cooled sample tube with high-purity nitrogen to normal pressure.

[0082] Step 4: Remove the sample tube backfilled with high-purity nitrogen from the degassing station ...

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Abstract

The invention relates to a powder equivalent diameter detection method. According to the technical scheme, the method comprises the steps that the mass of a clean and dry sample tube is measured to be m<0>, and 0.0500-2.0000 g of powder to be detected is put into the sample tube; the sample tube containing the powder to be detected is fixed at an isothermal physical adsorption instrument degassing station, degassing is conducted for 4 h to 24 h on the conditions that the vacuum degree ranges from 0.05 Pa to 0.2 Pa, and the temperature ranges from 100 DEG C to 300 DEG C, cooling is conducted to 25 DEG C to 35 DEG C, and high purity nitrogen is backfilled to normal pressure; the mass of the sample tube backfilled with high purity nitrogen is measured to be m<1>; a first adsorption volume V<1> corresponding to the relative pressure (P / P<0>)<1> of the powder to be detected at a first time point and a second adsorption volume V<2> corresponding to the relative pressure (P / P<0>)<2> of the powder to be detected at a second time point are detected in liquid nitrogen; finally, a powder equivalent diameter D can be obtained according to a mathematical model of the powder equivalent diameter D. The powder equivalent diameter detection method has the advantages of being high in precision, short in period, wide in evaluation range and good in safety property.

Description

technical field [0001] The invention belongs to the technical field of powder detection. In particular, it relates to a detection method for powder equivalent diameter. Background technique [0002] The particle size parameter of powder is an important index to measure the quality of powder, which directly affects its preparation and application. However, the particles in the powder are of different sizes and sizes, especially the proportion of particles of each scale is different, which has caused certain obstacles to the measurement and calculation of the particle size of the powder. How to accurately detect and comprehensively count, and then obtain the equivalent particle size of powder materials has become a key issue in the development of material science. [0003] At present, the detection of powder material diameter mainly adopts sieving method and observation method (Chen Weiping, et al. Several methods of nanoparticle testing. Journal of Jinan University (Natural...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02
CPCG01N15/02
Inventor 张寒赵惠忠顾华志葛山尹玉成刘志强李亦韦余俊
Owner 舜典仪器(上海)有限公司
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