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

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...

AI Technical Summary

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

Images