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Preparation method for high strength and high porosity in-situ growing magnesium borate whisker ceramic

A magnesium borate whisker and high porosity technology, which is applied in the field of ceramics, can solve the problems of high strength and porosity of magnesium borate whisker porous ceramics, and achieve the effects of solving strength limitations, simple process, and energy saving

Inactive Publication Date: 2018-07-10
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: the magnesium borate whisker porous ceramics prepared by the existing method cannot have both high strength and porosity. Method for whisker ceramics

Method used

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  • Preparation method for high strength and high porosity in-situ growing magnesium borate whisker ceramic
  • Preparation method for high strength and high porosity in-situ growing magnesium borate whisker ceramic
  • Preparation method for high strength and high porosity in-situ growing magnesium borate whisker ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 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

[0039]Take 8.1589g basic magnesium carbonate, 7.7906g boric acid, 0.1595g sodium pyrophosphate, 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 ...

Embodiment 3

[0041] Take 8.1589g basic magnesium carbonate, 7.7906g boric acid, 0.4785g sodium pyrophosphate, 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...

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Abstract

The invention discloses a preparation method for a high strength and high porosity in-situ growing magnesium borate whisker ceramic. The method includes the steps of: A, weighing the raw materials basic magnesium carbonate, boric acid, sodium pyrophosphate, polyvinyl alcohol and water; B, subjecting the raw materials weighed in step A to ball milling and mixing; C, drying the mixture prepared by step B under a 80DEG C temperature condition; D, conducting compression moulding on the material dried in step C; E, subjecting the compression moulded blank to drying treatment under a 110DEG C temperature condition; and F, sintering the blank dried in step E so as to obtain a finished product. On the basis of retaining in-situ synthesis preparation of magnesium borate whisker porous ceramic, themethod provided by the invention employs solid phase sintering technique, on the one hand solves the low porosity problem of magnesium borate whisker porous ceramic under a high strength condition, and on the other hand solves the problems of complex process and the like in preparation of magnesium borate whisker porous ceramic by freezing injection molding and sol-gel techniques.

Description

technical field [0001] The invention relates to the technical field of ceramics, in particular to a method for preparing magnesium borate whisker ceramics grown in situ with high strength and high porosity. 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 higher than 40% and the compressive strength is higher than 15MPa, the porous ceramics can be called high-strength and high-porosity ceramics. There are following problems in prior art: [0003] (1) A method for preparing porous ceramics with high porosity and in...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/81C04B38/00
CPCC04B35/01C04B35/803C04B38/00C04B2235/442C04B2235/447C04B2235/96C04B38/0074
Inventor 陈善华罗青松韩世虎
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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