Al2O3-ZrO2 based foam ceramic and preparation method thereof

A technology of foam ceramics and preparation steps, which is applied in the field of foam ceramics, can solve the problems of reducing the mechanical properties of materials, high raw material costs, unimproved zirconia foam ceramic filters to purify molten metal, etc., and achieves good thermal shock stability and strength high effect

Active Publication Date: 2018-03-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method improves the high-temperature strength and thermal shock stability of zirconia foamed ceramics to a certain extent, but its main defects are: (1) high cost of raw materials; (2) strict equipment requirements; The hollow ribs produced after decomposition are repaired, thus reducing the thermal shock resistance of the material; (4) The ability of zirconia foam ceramics to purify and filter molten metal has not been improved
However, its main defects are: (1) the ability of the zirconia foam ceramic filter to purify molten metal is not improved; (2) no defoamer is added; Stress concentration reduces the mechanical properties of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a kind of Al 2 o 3 -ZrO 2 Base foam ceramics and preparation method thereof, the steps of the preparation method are:

[0029] Step 1. Put 100 parts by mass of alumina micropowder and 50 to 80 parts of silica sol with a mass concentration of 16 to 20 wt% in a stirrer, and stir for 20 to 30 minutes to prepare slurry I;

[0030]Step 2. Mix 55-64 parts by mass of zirconia micropowder, 36-45 parts by mass of alumina micropowder, and 5-6.7 parts by mass of yttrium oxide powder to obtain mixed powder I, and then add 0.1 -0.6 parts by mass of polycarboxylate, 0.3-2 parts by mass of ammonium lignosulfonate, 0.1-0.5 parts by mass of octanol and 22-47 parts by mass of water, and mechanically milled for 1-3 hours to prepare slurry II;

[0031] Step 3: Immerse the polyurethane sponge in the slurry I under vacuum conditions, spray compressed air or centrifugally shake the slurry after immersion, and dry naturally for 12-24 hours to obtain Al 2 o 3 -ZrO 2 The prefabricated gree...

Embodiment 2

[0035] a kind of Al 2 o 3 -ZrO 2 Base ceramic foam and its preparation method. The preparation method shown in this embodiment except step 2, all the other are the same

[0036] Example 1.

[0037] Step 2: Mix 64 to 73 parts of zirconia micropowder, 27 to 36 parts of alumina micropowder, 2.5 to 3.7 parts of yttrium oxide powder and 2.8 to 3.9 parts of calcium oxide powder to obtain a mixed Powder I, then add 0.1 to 0.6 parts of polycarboxylate, 0.3 to 2 parts of ammonium lignosulfonate, 0.1 to 0.5 parts of octanol and 23 to 45 parts of water to the mixed powder I, mechanically Ball milling for 1 to 3 hours to obtain slurry II;

[0038] The Al prepared in Example 2 2 o 3 -ZrO 2 After testing, the compressive strength at room temperature is 1.7-2.5MPa; the number of water cooling cycles at 1100°C is 11-15 times; the impurity content of molten metal is reduced by 87-93% after filtering the metal copper liquid; the erosion resistance of alkali solution is 15-15 After 20 h...

Embodiment 3

[0040] a kind of Al 2 o 3 -ZrO 2 Base ceramic foam and its preparation method. The preparation method shown in this embodiment except step 2, all the other are the same

[0041] Example 1.

[0042] Step 2, add 73 to 82 parts of zirconia micropowder, 18 to 27 parts of alumina micropowder, 2.2 to 3.5 parts of yttrium oxide powder, 2.0 to 3.6 parts of calcium oxide powder and 0.8 to 0.9 The magnesia powder of the quality of 0.3-2 parts of ammonium lignosulfonate, the ammonium lignosulfonate of 0.1-0.5 parts of quality are added to the mixed powder I, and the Octanol and 23-45 parts by mass of water were mechanically ball milled for 1-3 hours to obtain slurry II;

[0043] The Al prepared in this embodiment 3 2 o 3 -ZrO 2 After testing, the compressive strength at room temperature is 1.6-2.6MPa; the number of water cooling cycles at 1100°C is 12-17 times; the impurity content of molten metal is reduced by 86-91% after filtering the metal copper liquid; the erosion resistanc...

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Abstract

The invention relates to Al2O3-ZrO2 based foam ceramic and a preparation method thereof. The preparation method comprises the following steps: mixing aluminum oxide micropowder and silicon sol uniformly to prepare slurry I; mixing zirconium oxide micropowder, aluminum oxide micropowder, additives, ammonium lignosulfonate, polycarboxylate, octanol and water uniformly to prepare slurry II; dipping polyurethane sponge into the slurry I under the vacuum condition, blowing by compressed air or centrifugally throwing slurry to obtain a Al2O3-ZrO2 based foam ceramic prefabricated green body; performing vacuum dipping on the Al2O3-ZrO2 based foam ceramic prefabricated green body by using the slurry II, blowing by compressed air or centrifugally throwing slurry and baking to obtain a Al2O3-ZrO2 based foam ceramic body; and performing heat preservation under a certain condition to obtain the Al2O3-ZrO2 based foam ceramic. The process is simple, the cost is low, and the prepared foam ceramic hashigh mechanical strength and high thermal shock resistance as well as has high adsorbability and mechanical resistance when being applied to purification of metal liquid.

Description

technical field [0001] The invention relates to the technical field of foam ceramics, in particular to an Al 2 o 3 -ZrO 2 Base ceramic foam and its preparation method. Background technique [0002] With the rapid development of science and technology, industrialization and equipment manufacturing have increasingly stringent requirements for the quality and purity of metal materials. Because of its unique three-dimensional connected curved hole network skeleton structure, ceramic foam has an open porosity of up to 80-90%, and through a variety of filtration and purification mechanisms: rectification of scum, mechanical interception and deep adsorption, etc., can effectively Therefore, foam ceramics are widely used in filtering and purifying molten metal. However, the foamed ceramics prepared by the organic foam impregnation method are due to the decomposition of polyurethane during the calcination process to form hollow bars and a large number of defects on the surface of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/81C04B35/80C04B38/06C22B15/14C22B9/02
CPCC04B35/10C04B35/803C04B38/0615C04B2235/3208C04B2235/3225C04B2235/3244C04B2235/3418C04B2235/5276C04B2235/6562C04B2235/6567C04B2235/96C04B2235/9692C22B9/023C22B15/006Y02P10/20
Inventor 贾文宝陈若愚黑大千汪瑜凡
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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