Method for measuring porosity of porous ceramic material by using non-invasive liquid nitrogen

A technology of porous ceramics and porosity, applied in suspension and porous material analysis, measurement devices, permeability/surface area analysis, etc., can solve problems such as mass loss errors, inorganic damage, etc., to reduce the possibility of crack formation, reduce Injury, effect of reducing capital requirements

Inactive Publication Date: 2012-07-25
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

[0004] In the past, most scholars used the boiling method or vacuum method to measure the porosity of ceramics, but these different methods have some problems in the measurement of porosity in porous ceramics, including the residual inorganic substances in ceramic fragments or ceramic fragments. damage to objects, errors due to loss of mass, need for specialized equipment and long operating times or use of hazardous materials

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  • Method for measuring porosity of porous ceramic material by using non-invasive liquid nitrogen
  • Method for measuring porosity of porous ceramic material by using non-invasive liquid nitrogen

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Embodiment 1

[0038] A method for measuring porosity with non-destructive liquid nitrogen, the method steps are as follows:

[0039] (1) Measurement of dry sample mass D;

[0040] Hang the dry sample put into the copper wire mesh basket above the Dewar bottle filled with liquid nitrogen, after the sample is cooled, record the mass D at this time as 1.6930g;

[0041] (2) Measurement of the mass S of the saturated sample in liquid nitrogen;

[0042] Submerge the sample put into the copper mesh basket after cooling into liquid nitrogen completely, and when the reading of the mass of the sample in liquid nitrogen remains unchanged, record the mass S at this time as 1.4765g. ;

[0043] (3) Measurement of the mass W in the air at the moment when the saturated sample is taken out from the liquid nitrogen;

[0044] Take out the copper wire mesh basket filled with liquid nitrogen saturated sample from the liquid nitrogen, place it in the air, and record the mass W of the sample at different times...

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Abstract

The invention discloses a method for measuring porosity by using non-invasive liquid nitrogen, and belongs to the field of porosity measurement. The method comprises the following steps of: firstly suspending a dry test sample above a Dewar flask filled with liquid nitrogen, and weighing the mass D of the dry test sample after the test sample is cooled; secondly, completely soaking the cooled test sample into the liquid nitrogen, and recording the mass S when the mass reading value of the test sample in the liquid nitrogen is unchanged; and finally taking the saturated test sample filled with the liquid nitrogen out, putting the saturated test sample in air, recording the mass corresponding to different moments, drawing a diagram by using the time as transverse coordinates and the mass of the corresponding moment as longitudinal coordinates to solve the instantaneous mass W of the test sample taken out of the liquid nitrogen in the air, and calculating the porosity by using the Archimedes principle. The method is simple and easy to operate and has less possibility of damaging the test sample which is low in strength and is in a fragment form; and hazardous materials and expensive equipment are not required in the process.

Description

technical field [0001] The invention belongs to the field of testing the porosity of porous ceramics, in particular to a method for measuring the porosity with non-damaging liquid nitrogen. Background technique [0002] Porosity is a fundamental property of ceramics, including porous ceramics. In this regard, the measurement of porosity plays an important role in characterizing the properties of ceramics. Currently, two aspects of research are related to the characteristics of porosity. First of all, it can tell people the production technology of ceramics, which includes many factors, such as raw material type, molding technology, sintering temperature, etc., all of which may have an impact on the porosity of ceramics. Second, it may also tell people about the properties of the material. Some engineering experiments have shown that the performance of ceramics, including porous ceramics, is affected by porosity. These properties include strength, permeability, thermal in...

Claims

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Application Information

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IPC IPC(8): G01N5/02G01N15/08
Inventor 梁小平任素娥刘建王化平左蕊李冬梅李建新王虹
Owner TIANJIN POLYTECHNIC UNIV
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