Porous sodium chloride of micron grain size and preparation method thereof

Abstract

The invention discloses a preparation method for a porous sodium chloride with micron diameter, in terms of mass ratio, comprising sixty to seventy five percent of sodium chloride coarse powder with adiameter between fifty micron and one hundred micron, fifteen to twenty five percent of sodium chloride micropowder with a diameter less than ten micron and ten to fifteen percent of potassium chlorate micropowder with a diameter less than ten micron. The invention is characterized in drying mixing the materials for eight to ten hours, then adding an additive comprising zero point three to one percent of polyvinyl alcohol, zero point three to one percent of glycerol, and three to ten percent of distilled water according to the mass ratio, molding by pressure, drying and sintering the molded body, drying at the temperature bewteen one hundred DEG C to one hundred and twenty DEG C with the drying heating rate between ten DEG C per minute and twenty DEG C per minute, then preserving heat forthirty minutes, sintering at the temperature bewteen seven hundred and forty DEG C to seven hundred and eighty DEG C for one to two hours with the sintering heating rate between three to five DEG C per minute, cooling to ambient temperature. The preparation mehod for a porous sodium chloride with micron diameter has the advantages of controlling porosity effectively, decreasing sintering temperature, increasing intensity and shortening sintering time.

Description

technical field [0001] The invention relates to a porous material, in particular to a porous sodium chloride and a preparation method thereof. Background technique [0002] The preparation of porous metals, ceramics and polymers requires corresponding porous preforms. Metals, ceramics or polymers are infiltrated into porous preforms, and the preforms are removed after solidification or solidification to obtain porous materials. Porous sodium chloride is a commonly used porous prefabricated type, which is low in cost and easy to remove. However, the particle size of sodium chloride that appears at present is on the millimeter scale, so only porous materials with a millimeter pore size can be prepared. Research by the University of Cambridge in the United Kingdom shows that if the pore size is reduced from millimeters to microns in the range of 50-90% porosity, many properties of porous materials will be improved by an order of magnitude according to the change of properties w...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the prior art that the particle size is in the millimeter scale, the sintering time is too long, and the efficiency is not high, the present invention provides a porous sodium chloride with a micron particle size, the particle size is only in the micron scale, the preparation cost is low, and the production method is simple , high reliability, long service life, wide application range, excellent comprehensive performance