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Method for preparing magnesium borate whisker ceramic film supporter with proper porosity and compressive strength

A technology of ceramic membrane support and magnesium borate whiskers, which is applied in the field of preparation of in-situ synthesis of magnesium borate whiskers porous ceramics by solid-state sintering method, can solve the problems of large range of compressive strength and porosity, magnesium borate whiskers Problems such as complex porous ceramic process, to achieve the effect of easy operation, energy saving and simple process

Inactive Publication Date: 2019-03-12
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other in-situ methods for synthesizing magnesium borate whisker porous ceramics, the present invention solves the pressure resistance of magnesium borate whisker porous ceramics on the one hand by adopting the solid-state sintering method on the basis of retaining in-situ synthesis to prepare magnesium borate whisker porous ceramics. The problem that the range of strength and porosity varies too much, on the other hand, it solves the problem of complex process for preparing magnesium borate whisker porous ceramics by freezing injection molding method and sol-gel method

Method used

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  • Method for preparing magnesium borate whisker ceramic film supporter with proper porosity and compressive strength
  • Method for preparing magnesium borate whisker ceramic film supporter with proper porosity and compressive strength
  • Method for preparing magnesium borate whisker ceramic film supporter with proper porosity and compressive strength

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preparation example Construction

[0050] A method for preparing a magnesium borate whisker ceramic membrane support with suitable porosity and compressive strength. The method uses basic magnesium carbonate and boric acid as main raw materials, magnesium fluoride as a sintering aid, and polyvinyl alcohol binder, etc. , through the process of weighing, ball milling, pressing, drying and sintering, the magnesium borate whisker porous ceramic whose skeleton is composed of magnesium borate whiskers was directly synthesized in situ. The specific steps are as follows:

[0051] Step 1, the basic magnesium carbonate and boric acid are mixed according to the Mg:B molar ratio of 1:1.1 to 1:1.5, and the mass content is magnesium fluoride and magnesium fluoride with a mass content of 1% to 5% of the total mass of basic magnesium carbonate and boric acid. The polyvinyl alcohol with a content of 5% of the total mass of basic magnesium carbonate and boric acid, and the deionized water with a mass content of 55.56% of the tota...

Embodiment 1

[0057] Take 8.1589g basic magnesium carbonate, 7.7906g boric acid, and 0.7975g polyvinyl alcohol and put them into a ball mill jar. Add 9ml of deionized water into the ball mill jar, and use wet ball milling. Place the ball mill pot in a planetary ball mill and mill it at a rate of 300r / min for 8 hours to obtain ceramic powder. Put the powder obtained after ball milling in an oven and dry at 80°C for 15 hours. Weigh the dried powder in the mold Medium compression molding, the diameter and thickness of the formed green body are both 22mm, the green body obtained after pressing is placed in an oven for 2 hours at 110°C, and then the dried body is placed in a quartz dry pot and then placed in a box-type high-temperature furnace In the process, the temperature was first raised from room temperature to 600°C at a rate of 2°C / min, and kept for 1 hour, then raised to 900°C at a rate of 5°C / min and held for 2 hours, and finally cooled to room temperature with the furnace. The cooled ...

Embodiment 2

[0059] Take 8.1589g basic magnesium carbonate, 7.7906g boric acid, 0.1595g magnesium fluoride, and 0.7975g polyvinyl alcohol and put them into a ball mill jar. Add 9ml of deionized water into the ball mill jar, and use wet ball milling. Place the ball mill pot in a planetary ball mill and mill it at a rate of 300r / min for 8 hours to obtain ceramic powder. Put the powder obtained after ball milling in an oven and dry at 80°C for 15 hours. Weigh the dried powder in the mold Medium compression molding, the diameter and thickness of the formed green body are both 22mm, the green body obtained after pressing is placed in an oven for 2 hours at 110°C, and then the dried body is placed in a quartz dry pot and placed in a box-type high temperature In the furnace, first raise from room temperature to 600°C at a rate of 2°C / min, hold for 1 hour, then raise to 900°C at a rate of 5°C / min and hold for 2 hours, and finally cool down to room temperature with the furnace. The cooled sample w...

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Abstract

The invention discloses a method for preparing a magnesium borate whisker ceramic film supporter with proper porosity and compressive strength. The method is characterized in that alkaline magnesium carbonate and boric acid are used as the main raw materials, MgF2 (magnesium fluoride) is used a sintering additive, PVA (polyvinyl alcohol) is used as an adhesive, and deionized water is used as a solvent. The method comprises the following steps of (1) weighing; (2) ball milling and mixing of material; (3) drying at the temperature of 80 DEG C; (4) pressing and forming; (5) drying at the temperature of 110 DEG C; (6) sintering. Compared with the prior art, the method has the advantages that on the basis of reserving the preparation of magnesium borate whisker porous ceramic via in-situ synthesis, the magnesium borate whisker porous ceramic with compressive strength of 11.35 to 14.51 MPa and porosity of 51.77 to 60.95% can be prepared; the problem of overlarge change in compressive strength and porosity of the magnesium borate whisker porous ceramic is solved, and the problems including complicated technology in preparation of the magnesium borate whisker porous ceramic by freezing mold injection method and sol-gel method are solved.

Description

technical field [0001] The invention relates to a preparation method of a magnesium borate whisker ceramic membrane support body with suitable porosity and compressive strength, in particular to a preparation method for in-situ synthesis of magnesium borate whisker porous ceramics by a solid-phase sintering method. The prepared porous ceramic has suitable porosity and compressive strength, and the framework is composed of high-strength magnesium borate whiskers. Background technique [0002] Porous ceramics have the advantages of high porosity, low thermal conductivity, high strength, low thermal conductivity, good thermal stability and excellent high temperature performance. They have very broad application prospects in the fields of chemical industry, food, environmental protection and light industry. At present, in the preparation process of porous ceramics, the compressive strength of ceramics decreases due to the existence of pores. Generally, when the porosity is high...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/58C04B35/622C04B35/64
CPCC04B38/00C04B35/58C04B35/62227C04B35/64C04B2235/3206C04B2235/6562C04B2235/6567C04B2235/96C04B38/0074
Inventor 陈善华韩世虎罗青松
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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