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Preparation method of high-strength composite foamed ceramic

A composite foam, high-strength technology, used in the field of ceramic materials, can solve the problems of poor mechanical properties and low strength of foamed ceramics, and achieve the effects of enhancing density, reducing phase changeability, and inhibiting aging.

Inactive Publication Date: 2021-01-01
王桂花
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: Aiming at the problems of low strength and poor mechanical properties of existing foam ceramics, a preparation method of high-strength composite foam ceramics is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In terms of parts by weight, weigh 30 parts of zirconia whiskers with an average length of 200 μm, 3 parts of vinyltriethoxysilane, 0.6 parts of stearic acid, and 80 parts of absolute ethanol. Vinyltriethoxysilane , Stearic acid was added to absolute ethanol, and stirred at a speed of 180r / min for 30min in a water bath at 30°C to obtain a modified solution. Add zirconia whiskers to the modified solution, place it in an ultrasonic disperser, and Ultrasound at 300W for 20min, let stand for 2h, filter, take the filter cake, wash 3 times with deionized water, dry in an oven at 80°C for 1h, and cool at room temperature to obtain modified zirconia whiskers

[0030] In parts by weight, weigh 50 parts of silicon nitride powder with an average particle diameter of 80nm, 20 parts of modified zirconia whiskers, 3 parts of yttrium oxide powder with an average particle diameter of 40nm, 1 part of polyvinyl alcohol, 5 parts Glycerol, 1 part of carboxymethyl cellulose, 60 parts of dei...

Embodiment 2

[0033]In terms of parts by weight, weigh 40 parts of zirconia whiskers with an average length of 300 μm, 3 parts of vinyltriethoxysilane, 0.8 parts of stearic acid, and 80 parts of absolute ethanol. Vinyltriethoxysilane , Stearic acid was added to absolute ethanol, and stirred at a speed of 180r / min for 40min in a water bath at 40°C to obtain a modified solution. Add zirconia whiskers to the modified solution, place it in an ultrasonic disperser, and Ultrasound at 300W for 30min, let stand for 2h, filter, take the filter cake, wash 5 times with deionized water, dry in an oven at 80°C for 2h, and cool at room temperature to obtain modified zirconia whiskers

[0034] In parts by weight, weigh 50 parts of silicon nitride powder with an average particle diameter of 100nm, 30 parts of modified zirconia whiskers, 3 parts of yttrium oxide powder with an average particle diameter of 60nm, 3 parts of polyvinyl alcohol, 5 parts of Glycerol, 3 parts of carboxymethyl cellulose, 60 parts o...

Embodiment 3

[0037] In terms of parts by weight, weigh 40 parts of zirconia whiskers with an average length of 400 μm, 4 parts of vinyltriethoxysilane, 0.8 parts of stearic acid, and 100 parts of absolute ethanol. Vinyltriethoxysilane , Stearic acid was added to absolute ethanol, and stirred at a speed of 200r / min for 40min in a water bath at 40°C to obtain a modified solution. Add zirconia whiskers to the modified solution, place it in an ultrasonic disperser, and Ultrasound at 400W for 30min, let stand for 4h, filter, take the filter cake, wash 5 times with deionized water, dry in an oven at 90°C for 2h, and cool at room temperature to obtain modified zirconia whiskers

[0038] In parts by weight, weigh 60 parts of silicon nitride powder with an average particle diameter of 120nm, 30 parts of modified zirconia whiskers, 5 parts of yttrium oxide powder with an average particle diameter of 80nm, 3 parts of polyvinyl alcohol, 10 parts Glycerol, 3 parts of carboxymethyl cellulose, 80 parts o...

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Abstract

The invention relates to a preparation method of high-strength composite foamed ceramic, and belongs to the technical field of ceramic materials. Silicon nitride and zirconium oxide whiskers are usedas raw materials to prepare the high-strength composite foamed ceramic, zirconium oxide is a high-hardness compound and can play a role in dispersion enhancement in the foamed ceramic, zirconium oxideis in a pressed state in a matrix due to thermal mismatch of the zirconium oxide whiskers and silicon nitride. A semi-coherent structure and a co-permeation structure are not easy to form at the grain boundary, so that the semi-coherent structure and the co-permeation structure can be well connected; the material keeps very high mechanical strength, and the addition of the zirconium oxide whiskers increases the constraint on a matrix, so that the phase-change capability is reduced, the aging phenomenon of the zirconium oxide whiskers can be inhibited, and the oxidation resistance of the foamed ceramic is improved; the zirconium oxide whiskers can also form a layer of compact zirconium oxide film on the surface of the composite foamed ceramic, and oxygen can be effectively prevented from entering, so that the oxidation resistance and the mechanical property of the composite foamed ceramic are improved.

Description

technical field [0001] The invention relates to a preparation method of high-strength composite foam ceramics, belonging to the technical field of ceramic materials. Background technique [0002] Ceramic foam is a new type of porous material, which has the advantages of high chemical stability, high strength, high temperature resistance, thermal shock resistance, low density, high porosity, large specific surface area, etc. , chemical catalysis and biomaterials and other fields have shown great application prospects. However, there are very few types of foam ceramics, which are divided into three categories according to their main components: silicon carbide, zirconia and silicon nitride. Obviously, these materials can only be applied to specific occasions. If the advantages of foam ceramics are to be brought into play in more fields, more types of foam ceramics need to be developed. Foamed ceramics can generally be divided into two categories, namely open-cell ceramics an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B35/584C04B35/63
CPCC04B35/584C04B35/6303C04B38/10C04B2235/3225C04B2235/483C04B2235/5276C04B2235/5427C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/606C04B2235/656C04B2235/6567
Inventor 王桂花
Owner 王桂花
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