CN111548139A - Composite domestic ceramic product with high crack resistance and preparation method thereof - Google Patents

Composite domestic ceramic product with high crack resistance and preparation method thereof Download PDF

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Publication number
CN111548139A
CN111548139A CN202010367040.5A CN202010367040A CN111548139A CN 111548139 A CN111548139 A CN 111548139A CN 202010367040 A CN202010367040 A CN 202010367040A CN 111548139 A CN111548139 A CN 111548139A
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mullite
crack resistance
high crack
composite
particles
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颜晓刚
颜劲松
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Fujian Dehua Yunsong Ceramics Co ltd
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Fujian Dehua Yunsong Ceramics Co ltd
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    • C04B35/185—Mullite 3Al2O3-2SiO2
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Abstract

Disclosure of the inventionA composite ceramic product with high crack resistance for daily use and a preparation method thereof relate to the technical field of ceramic products, and the ceramic product comprises a mullite ceramic layer, wherein an aluminum layer is clamped in the mullite ceramic layer to prevent the growth of stress cracks in mullite; adding aluminum layer into raw material containing alumina, silica and Si or Si-containing compound with average grain diameter of 0.1-l0 mu m under oxygen-containing atmosphere at 1700-1800 ℃ for reaction and sintering to generate the composite daily ceramic product with high crack resistance, wherein the Si-containing compound is SiC or Si3N4、Si2ON2Or sialon, the average temperature rise rate during firing between 900 ℃ and 1700 ℃ is set to 25 to 3000C/hr. The present invention inserts an aluminum layer into the mullite ceramic layer to prevent the growth of stress cracks in the mullite, so that the cracks do not exceed a specific size.

Description

Composite domestic ceramic product with high crack resistance and preparation method thereof
Technical Field
The invention relates to the technical field of ceramic products, in particular to a composite domestic ceramic product with high crack resistance and a preparation method thereof.
Background
The traditional ceramic products generally adopt more traditional colors such as blue, scarlet and the like, artworks are products processed by raw materials or semi-finished products manually or mechanically, and the existing ceramic products are too complex in preparation method and poor in crack resistance.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a composite domestic ceramic product with high crack resistance and a preparation method thereof, and solves the problems that the preparation method of the conventional ceramic product is too complicated and the crack resistance effect is poor.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a composite ceramic product with high crack resistance for daily use is composed of a mullite ceramic layer and an Al layer sandwiched between said mullite ceramic layer for preventing the stress crack in mullite from growing.
Preferably, the mullite ceramic layer contains, in a polished cross section, spherical particles of mullite having an aspect ratio of 1 to 2 inclusive and acicular particles of mullite having an aspect ratio of more than 2 to 10 inclusive, and the average particle diameter of the spherical particles is 5 to l0um, the average major diameter of the acicular particles is 2 to 10 times the average particle diameter of the spherical particles, the major diameter of the acicular particles is 12 to 90 μm, and the ratio of the area of the acicular particles to the area of all the particles is 0.03 to 0.3.
Preferably, the ratio of the area of coarse acicular particles having an aspect ratio of more than 10/the area of all particles in the polished cross section of the mullite ceramic layer is 0.2 or less.
Preferably, the mullite ceramic layer has an apparent porosity of 5-27%.
Preferably, the mullite ceramic layer has a ratio of a total area of coarse pores having a major diameter 5 times or more larger than an average major diameter of the acicular particles to an area of an observation field of view of 0.07 or less in a polished cross section.
Preferably, the mullite ceramic layer has a ratio of a total area of coarse pores having a major diameter 5 times or more larger than an average major diameter of the acicular particles to an area of an observation field of view of 0.07 or less in a polished cross section.
Preferably, the preparation method of the composite domestic ceramic product with high crack resistance is characterized in that: the method comprises the following steps: adding aluminum layer into raw material containing alumina, silica and Si or Si-containing compound with average grain diameter of 0.1-l0 mu m under oxygen-containing atmosphere at 1700-1800 ℃ for reaction and sintering to generate the composite daily ceramic product with high crack resistance, wherein the Si-containing compound is SiC or Si3N4、Si2ON2Or sialon, the average temperature rise rate during firing between 900 ℃ and 1700 ℃ is set to 25 to 3000C/hr.
Further, alumina, silica and the Si or Si-containing compound having an average particle diameter of 0.1 to 0 μm are slurried by wet mixing, and the resulting slurry is cast or spray-dried to obtain pellets, which are then subjected to press molding or CIP molding, followed by reaction firing.
Further, alumina, silica and the Si or Si-containing compound having an average particle diameter of 0.1 to 0 μm are kneaded by a semi-wet method, and the resulting kneaded product is subjected to plastic molding and then to reaction firing.
(III) advantageous effects
The invention provides a composite domestic ceramic product with high crack resistance and a preparation method thereof, and the composite domestic ceramic product has the following beneficial effects:
the aluminum layer is clamped in the mullite ceramic layer to prevent the growth of stress cracks in the mullite, so that the cracks do not exceed a specific size, and the problems of too complicated preparation method and poor crack resistance effect of the conventional ceramic product are solved.
Drawings
FIG. 1 is a schematic structural view of a mullite ceramic layer of the present invention;
FIG. 2 is a flow chart of the preparation of the mullite ceramic layer of the present invention;
in the figure: a mullite ceramic layer 1; an aluminum layer 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-2, the present invention provides a technical solution: a composite ceramic product with high crack resistance for daily use is composed of a mullite ceramic layer and an Al layer sandwiched between said mullite ceramic layer for preventing the stress crack in mullite from growing.
As a preferred technical scheme of the invention: the mullite ceramic layer contains, in a polished cross section, spherical particles of mullite having an aspect ratio of 1 to 2 inclusive and acicular particles of mullite having an aspect ratio of more than 2 to 10 inclusive, and the average particle diameter of the spherical particles is 5 to l0um, the average major diameter of the acicular particles is 2 to 10 times the average particle diameter of the spherical particles, the major diameter of the acicular particles is 12 to 90um, and the ratio of the area of the acicular particles to the area of the entire particles is 0.03 to 0.3.
As a preferred technical scheme of the invention: the ratio of the area of coarse acicular particles having an aspect ratio of more than 10 in the polished cross section of the mullite ceramic layer to the area of all the particles is 0.2 or less.
As a preferred technical scheme of the invention: the apparent porosity of the mullite ceramic layer is 5-27%.
As a preferred technical scheme of the invention: the mullite ceramic layer has a ratio of the total area of coarse pores having a major diameter 5 times or more the average major diameter of the acicular particles to the area of the observation field of view of 0.07 or less in the polished cross section.
As a preferred technical scheme of the invention: the ratio of the total area of coarse pores having a major diameter 5 times or more the average major diameter of the acicular particles to the area of the observation field of view in the polished cross section of the mullite ceramic layer is 0.07 or less.
As a preferred technical scheme of the invention: a preparation method of a composite domestic ceramic product with high crack resistance is characterized in that: the method comprises the following steps: adding aluminum layer into raw material containing alumina, silica and Si or Si-containing compound with average grain diameter of 0.1-l0 mu m under oxygen-containing atmosphere at 1700-1800 ℃ for reaction and sintering to generate the composite daily ceramic product with high crack resistance, wherein the Si-containing compound is SiC or Si3N4、Si2ON2Or sialon, the average temperature rise rate during firing between 900 ℃ and 1700 ℃ is set to 25 to 3000C/hr.
As a preferred technical scheme of the invention: alumina, silica and the Si or Si-containing compound having an average particle diameter of 0.1 to 0 μm are slurried by wet mixing, and the resulting slurry is cast or spray-dried to obtain pellets, which are press-molded or CIP-molded and then reaction-fired. In the wet mixing, alumina, silica, and a Si-containing compound are wet-mixed using a liquid medium to form a slurry. The obtained slurry is cast or spray-dried, and the obtained granules are press-molded or CIP-molded and then reaction-fired. As an apparatus used for the wet mixing, a known kneading apparatus, for example, a media mill such as a ball mill, can be used. The solid content concentration in the slurry may be preferably about 35 to 45% by weight. A binder may also be added to the slurry. As the binder, for example, a binder generally used in the art, such as polyvinyl alcohol (PVA) or carboxymethyl cellulose (CMC), can be used without particular limitation. The molding pressure in the case of press molding or CIP molding is preferably set to about 70 to 150 MPa.
As a preferred technical scheme of the invention: alumina, silica and the Si or Si-containing compound having the average particle diameter of 0.1 to 0 μm are kneaded by a semi-wet method, and the resulting kneaded product is subjected to plastic molding and then to reaction firing. In the case of semi-wet mixing, alumina, silica and a Si-containing compound are formed into a semi-fluid using a liquid medium, and the semi-fluid is kneaded to obtain a kneaded product. The solid content concentration in the kneaded mixture can be preferably about 10 to 15 wt%. The kneaded product is moldable into a desired shape by extrusion molding or the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (9)

1. A composite ceramic product with high crack resistance for daily use comprises a mullite ceramic layer, and is characterized in that: an aluminum layer is sandwiched between the mullite ceramic layers to prevent the growth of stress cracks in the mullite.
2. The composite domestic ceramic article with high crack resistance according to claim 1, characterized in that: the mullite ceramic layer contains, in a polished cross section, spherical particles of mullite having an aspect ratio of 1 to 2 inclusive and acicular particles of mullite having an aspect ratio of more than 2 to 10 inclusive, and the average particle diameter of the spherical particles is 5 to l0um, the average major diameter of the acicular particles is 2 to 10 times the average particle diameter of the spherical particles, the major diameter of the acicular particles is 12 to 90um, and the ratio of the area of the acicular particles to the area of the entire particles is 0.03 to 0.3.
3. The composite domestic ceramic article with high crack resistance according to claim 2, characterized in that: the ratio of the area of coarse acicular particles having an aspect ratio of more than 10 in the polished cross section of the mullite ceramic layer to the area of all the particles is 0.2 or less.
4. A composite domestic ceramic article with high crack resistance according to claim 2 or 3, characterized in that: the apparent porosity of the mullite ceramic layer is 5-27%.
5. A composite domestic ceramic article with high crack resistance according to claim 2 or 3, characterized in that: the mullite ceramic layer has a ratio of the total area of coarse pores having a major diameter 5 times or more the average major diameter of the acicular particles to the area of the observation field of view of 0.07 or less in the polished cross section.
6. The composite domestic ceramic article with high crack resistance according to claim 4, characterized in that: the mullite ceramic layer has a ratio of the total area of coarse pores having a major diameter 5 times or more the average major diameter of the acicular particles to the area of the observation field of view of 0.07 or less in the polished cross section.
7. The process for the preparation of a composite domestic ceramic article with high crack resistance according to any one of claims 1 to 6, characterized in that: the method comprises the following steps: adding an aluminum layer into a mullite ceramic layer raw material containing alumina, silica and Si or a Si-containing compound with the average grain diameter of 0.1-l0 mu m under the oxygen-containing atmosphere at the temperature of 1700-1800 ℃ for reaction and sintering to generate the composite domestic ceramic product with high crack resistance, wherein the Si-containing compound is SiC or Si3N4、Si2ON2Or sialon, the average temperature rise rate during firing between 900 ℃ and 1700 ℃ is set to 25 to 3000C/hr.
8. The method for preparing a composite domestic ceramic article with high crack resistance according to claim 7, wherein: alumina, silica and the Si or Si-containing compound having an average particle diameter of 0.1 to 0 μm are slurried by wet mixing, and the resulting slurry is cast or spray-dried to obtain pellets, which are press-molded or CIP-molded and then reaction-fired.
9. The method for preparing a composite domestic ceramic article with high crack resistance according to claim 7, wherein: alumina, silica and the Si or Si-containing compound having the average particle diameter of 0.1 to 0 μm are kneaded by a semi-wet method, and the resulting kneaded product is subjected to plastic molding and then to reaction firing.
CN202010367040.5A 2020-04-30 2020-04-30 Composite domestic ceramic product with high crack resistance and preparation method thereof Withdrawn CN111548139A (en)

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