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Method for preparing high-porosity in-situ grown magnesium borate whisker porous ceramics

A magnesium borate whisker, in-situ growth technology, applied in ceramic products, applications, household appliances, etc., can solve the problem of low porosity of porous ceramics, and achieve the effect of improving toughness, high elastic modulus, and high strength

Inactive Publication Date: 2015-04-01
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] One of the purposes of the present invention is to provide a method for frozen injection molding of high-porosity in-situ growth of magnesium borate whisker porous ceramics, which solves the problem of the existing method of in-situ growth of magnesium borate whisker porous ceramics in the preparation of porous ceramics. low rate problem

Method used

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  • Method for preparing high-porosity in-situ grown magnesium borate whisker porous ceramics
  • Method for preparing high-porosity in-situ grown magnesium borate whisker porous ceramics
  • Method for preparing high-porosity in-situ grown magnesium borate whisker porous ceramics

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Embodiment 1

[0059] Take 11.0 g of basic magnesium carbonate, 10.56 g of boric acid, 1.08 g of nickel nitrate, 0.65 g of sodium methylcellulose and 0.086 g of polyacrylamide into a ball mill jar, and ball mill at a speed of 300 r / min for 12 h to obtain a finely ground The final mixture; put the mixed powder and 50 ml deionized water in a beaker, and stir for 6 h with a stirrer to obtain a ceramic slurry; inject the slurry into Figure 1-2 In the freezing device shown, the liquid nitrogen was used for rapid cooling, and the cooled green body was placed in a vacuum freeze dryer at -10 °C and 60 Pa for 60 hours of vacuum drying; then the dried green body was demolded and placed in a crucible And put it into a high-temperature furnace, first raise the temperature from room temperature to 700 °C at a rate of 2 °C / min, keep it for 1 h, and then raise the temperature from 700 °C to 900 °C at a rate of 5 °C / min and keep it for 4 h, so that the magnesium borate crystals The whiskers can grow comple...

Embodiment 2

[0061] Take 18.96 g magnesium basic carbonate, 18.10 g boric acid, 1.85 g nickel nitrate, 1.11 g sodium methylcellulose and 0.15 g polyacrylamide into a ball mill jar, and ball mill it at a speed of 300 r / min for 20 hours to obtain the finely ground Mixed material; put the mixed powder and 50 ml deionized water in a beaker, stir with a stirrer for 8 hours to obtain a ceramic slurry; inject the slurry into figure 1 In the freezing device shown, the body was rapidly cooled with liquid nitrogen, and the cooled green body was placed in a vacuum freeze dryer at -10 °C and 60 Pa for 48 h in vacuum; then the dried green body was demolded and placed in a Put it in a crucible and put it into a high-temperature furnace, first raise the temperature from room temperature to 700 °C at a rate of 2 °C / min, and keep it for 1 h, then raise the temperature from 700 °C to 900 °C at a rate of 5 °C / min and keep it for 5 h, so that the boric acid Magnesium whiskers can grow completely, and then coo...

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Abstract

The invention discloses a method for preparing high-porosity in-situ grown magnesium borate whisker porous ceramics. The method is that basic magnesium carbonate and boric acid are used as the raw materials; nitrate is used as a catalyst; sodium methyl cellulose is used as a binder; and polyacrylamide is used as a dispersing agent. The method comprises the steps of (1) mixing the materials through a ball mill; (2) preparing slurry; (3) shaping by injection molding and directionally freezing and curing; (4) freezing and drying in a vacuum condition; (5) sintering at the normal temperature; and (6) washing. Compared with the prior art, the method has the advantages that the in-situ grown magnesium borate whisker porous ceramics with high porosity reaching 85% can be prepared, the problem of relatively low porosity of the in-situ grown magnesium borate whisker porous ceramics prepared by the prior art can be solved, and the problem that non-uniform material mixing leads to non-uniform growing of whiskers in the magnesium borate whisker porous ceramics preparation process can be solved.

Description

technical field [0001] The invention relates to a method for preparing porous ceramics with high porosity and in-situ growth of magnesium borate whiskers, in particular to a method for preparing high-porosity and in-situ growth of magnesium borate whiskers porous ceramics by freezing injection molding. The prepared porous ceramic has a high porosity structure and its skeleton is composed of magnesium borate whiskers obtained from in-situ reaction during the sintering process. Background technique [0002] Porous ceramics have the advantages of low density, high porosity, high temperature resistance, moderate strength, low thermal conductivity and good thermal stability. They have extremely broad application prospects in metallurgy, chemical industry, light industry, food, environmental protection, energy saving and other fields. High-porosity porous ceramics refer to porous ceramics whose volume fraction of pores exceeds 60%. At present, the development of high-porosity por...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B38/06C04B35/622
Inventor 陈善华辜丽欢孙刚陈博程军超姜志鹏
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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