CN112723892B - Preparation method of ceramic material with excellent thermal conductivity and ceramic material - Google Patents
Preparation method of ceramic material with excellent thermal conductivity and ceramic material Download PDFInfo
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Abstract
The invention is suitable for the technical field of ceramic materials, and provides a preparation method of a ceramic material with excellent thermal conductivity and the ceramic material, wherein the preparation method comprises the following steps: mixing aluminum nitride, boric anhydride, magnesium borate whisker, sodium hexafluoroaluminate, zirconium tungstate and yttrium oxide to obtain a mixture; placing the mixture in a ball mill, and adding absolute ethyl alcohol for ball milling to obtain raw material slurry; after spray drying the raw material slurry, sieving to obtain material particles, and performing compression molding on the material particles to obtain a green compact; and sintering the pressed compact, and naturally cooling to obtain the ceramic material.
Description
Technical Field
The invention belongs to the technical field of ceramic materials, and particularly relates to a preparation method of a ceramic material with excellent thermal conductivity and the ceramic material.
Background
Ceramic materials are inorganic non-metallic materials made from natural or synthetic compounds through shaping and high-temperature sintering, and generally have the advantages of high melting point, high hardness, high wear resistance, oxidation resistance and the like.
In the prior art, products such as a ceramic bowl and a ceramic electric cooker liner are often required to be made of ceramic materials with better thermal conductivity, however, the existing ceramic materials for the bowl and the electric cooker liner have the problem of poorer thermal conductivity, and therefore, how to improve the thermal conductivity of the ceramic materials is one of the problems to be solved urgently at present.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a method for preparing a ceramic material having excellent thermal conductivity, which aims to solve the problems set forth in the background art.
The embodiment of the invention is realized by a preparation method of a ceramic material with excellent thermal conductivity, which comprises the following steps:
mixing 40-60 parts of aluminum nitride, 5-12 parts of boric anhydride, 8-15 parts of magnesium borate whisker, 5-12 parts of sodium hexafluoroaluminate, 3-8 parts of zirconium tungstate and 4-10 parts of yttrium oxide according to parts by weight to obtain a mixture;
placing the mixture into a ball mill, and adding absolute ethyl alcohol for ball milling to obtain raw material slurry;
after the raw material slurry is subjected to spray drying, sieving is carried out to obtain material particles, and the material particles are subjected to compression molding to obtain a green compact;
and sintering the pressed compact, and naturally cooling to obtain the ceramic material.
As a preferable scheme of the embodiment of the invention, in the step, 45-55 parts of aluminum nitride, 8-10 parts of boric anhydride, 10-13 parts of magnesium borate whisker, 7-9 parts of sodium hexafluoroaluminate, 4-6 parts of zirconium tungstate and 5-7 parts of yttrium oxide are mixed according to parts by weight to obtain a mixture.
As another preferable mode of the embodiment of the present invention, in the step, 50 parts by weight of aluminum nitride, 9 parts by weight of boric anhydride, 12 parts by weight of magnesium borate whisker, 8 parts by weight of sodium hexafluoroaluminate, 5 parts by weight of zirconium tungstate, and 6 parts by weight of yttrium oxide are mixed to obtain a mixed material.
As another preferable scheme of the embodiment of the invention, the mass ratio of the mixed material to the absolute ethyl alcohol is 1 (0.2-0.6).
As another preferable scheme of the embodiment of the invention, in the step, the sintering temperature is 1000-1200 ℃.
Another object of the embodiments of the present invention is to provide a ceramic material prepared by the above preparation method.
As another preferable scheme of the embodiment of the invention, the thermal conductivity of the ceramic material is 301.9-325.5W/m.K.
Compared with the prior art, the preparation method of the ceramic material with excellent thermal conductivity provided by the embodiment of the invention has the following beneficial technical effects:
(1) by adding the boric anhydride component with low melting point and the sodium hexafluoroaluminate component, the two components can be completely melted in the high-temperature sintering process, so that the dispersion and sintering of other components are facilitated, and the sintering temperature and time of the components such as aluminum nitride and the like can be reduced; and the reduction of sintering temperature and time can reduce the porosity of the prepared ceramic material, thereby improving the performances of the ceramic material such as heat conductivity, heat diffusivity and the like.
(2) The zirconium tungstate with the negative expansion coefficient added in the invention can be dispersed in the boric anhydride with high expansion coefficient in the sintering process, thereby playing a compounding role, obviously reducing the thermal expansion coefficient of the ceramic material and improving the heat resistance of the ceramic material.
(3) According to the invention, by adding the yttrium oxide component, in the sintering process, the density of the ceramic material can be increased and the porosity of the ceramic material can be reduced by introducing the rare earth element and refining the ceramic crystal of the ceramic material, so that the thermal conductivity and the oxidation resistance of the ceramic material can be obviously improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
This embodiment provides a ceramic material having excellent thermal conductivity, which is prepared by a method comprising the steps of:
(1) weighing 2kg of aluminum nitride, 0.6kg of boric anhydride, 0.75kg of magnesium borate whisker, 0.6kg of sodium hexafluoroaluminate, 0.4kg of zirconium tungstate and 0.5kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.6, and then performing ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained green compact for 4 hours at the constant temperature of 1000 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Example 2
This embodiment provides a ceramic material having excellent thermal conductivity, which is prepared by a method comprising the steps of:
(1) weighing 3kg of aluminum nitride, 0.25kg of boric anhydride, 0.4kg of magnesium borate whisker, 0.25kg of sodium hexafluoroaluminate, 0.15kg of zirconium tungstate and 0.2kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.2, and then carrying out ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained green compact for 7 hours at the constant temperature of 1200 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Example 3
This embodiment provides a ceramic material having excellent thermal conductivity, which is prepared by a method comprising the steps of:
(1) weighing 2.25kg of aluminum nitride, 00.5kg of boric anhydride, 0.65kg of magnesium borate whisker, 0.45kg of sodium hexafluoroaluminate, 0.3kg of zirconium tungstate and 0.35kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.3, and then carrying out ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained pressed compact for 5 hours at the constant temperature of 1100 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Example 4
This embodiment provides a ceramic material having excellent thermal conductivity, which is prepared by a method comprising the steps of:
(1) weighing 2.75kg of aluminum nitride, 0.4kg of boric anhydride, 0.5kg of magnesium borate whisker, 0.35kg of sodium hexafluoroaluminate, 0.2kg of zirconium tungstate and 0.25kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.5, and then carrying out ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained pressed compact for 5 hours at the constant temperature of 1100 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Example 5
This embodiment provides a ceramic material having excellent thermal conductivity, which is prepared by a method comprising the steps of:
(1) weighing 2.5kg of aluminum nitride, 0.45kg of boric anhydride, 0.6kg of magnesium borate whisker, 0.4kg of sodium hexafluoroaluminate, 0.25kg of zirconium tungstate and 0.3kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.4, and then carrying out ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained pressed compact for 5 hours at the constant temperature of 1100 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Example 6
This embodiment provides a ceramic material having excellent thermal conductivity, which is prepared by a method comprising the steps of:
(1) weighing 2.2kg of aluminum nitride, 0.3kg of boric anhydride, 0.45kg of magnesium borate whisker, 0.3kg of sodium hexafluoroaluminate, 0.2kg of zirconium tungstate and 0.25kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.4, and then carrying out ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained pressed compact for 5 hours at the constant temperature of 1100 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Example 7
This embodiment provides a ceramic material having excellent thermal conductivity, the preparation method of which comprises the steps of:
(1) weighing 2.9kg of aluminum nitride, 0.55kg of boric anhydride, 0.7kg of magnesium borate whisker, 0.55kg of sodium hexafluoroaluminate, 0.35kg of zirconium tungstate and 0.45kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.4, and then performing ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained pressed compact for 5 hours at the constant temperature of 1100 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Example 8
This embodiment provides a ceramic material having excellent thermal conductivity, which is prepared by a method comprising the steps of:
(1) weighing 2.8kg of aluminum nitride, 0.55kg of boric anhydride, 0.6kg of magnesium borate whisker, 0.5kg of sodium hexafluoroaluminate, 0.3kg of zirconium tungstate and 0.45kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.4, and then carrying out ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained pressed compact for 5 hours at the constant temperature of 1100 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Example 9
This embodiment provides a ceramic material having excellent thermal conductivity, which is prepared by a method comprising the steps of:
(1) weighing 2.6kg of aluminum nitride, 0.55kg of boric anhydride, 0.65kg of magnesium borate whisker, 0.58kg of sodium hexafluoroaluminate, 0.32kg of zirconium tungstate and 0.48kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.4, and then carrying out ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained pressed compact for 5 hours at the constant temperature of 1100 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Example 10
This embodiment provides a ceramic material having excellent thermal conductivity, which is prepared by a method comprising the steps of:
(1) weighing 2.5kg of aluminum nitride, 0.6kg of boric anhydride, 0.5kg of magnesium borate whisker, 0.5kg of sodium hexafluoroaluminate, 0.3kg of zirconium tungstate and 0.4kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.4, and then carrying out ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained pressed compact for 5 hours at the constant temperature of 1100 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Comparative example 1 (No boron anhydride component compared to example 5)
This comparative example provides a ceramic material having excellent thermal conductivity, which was prepared by a method comprising the steps of:
(1) weighing 2.95kg of aluminum nitride, 0.6kg of magnesium borate whisker, 0.4kg of sodium hexafluoroaluminate, 0.25kg of zirconium tungstate and 0.3kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.4, and then carrying out ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained pressed compact for 5 hours at the constant temperature of 1100 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Comparative example 2 (No sodium hexafluoroaluminate component, compare with example 5)
This comparative example provides a ceramic material having excellent thermal conductivity, which was prepared by a method comprising the steps of:
(1) weighing 2.9kg of aluminum nitride, 0.45kg of boric anhydride, 0.6kg of magnesium borate whisker, 0.25kg of zirconium tungstate and 0.3kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.4, and then carrying out ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained pressed compact for 5 hours at the constant temperature of 1100 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Comparative example 3 (No boron anhydride and No sodium hexafluoroaluminate Components compared to example 5)
This comparative example provides a ceramic material having excellent thermal conductivity, which was prepared by a method comprising the steps of:
(1) weighing 3.35kg of aluminum nitride, 0.6kg of magnesium borate whisker, 0.25kg of zirconium tungstate and 0.3kg of yttrium oxide, and then placing the components together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.4, and then carrying out ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained pressed compact for 5 hours at the constant temperature of 1100 ℃, and naturally cooling to room temperature to obtain the ceramic material.
Comparative example 4 (No yttria component compared to example 5)
This comparative example provides a ceramic material having excellent thermal conductivity, which was prepared by a method comprising the steps of:
(1) weighing 2.8kg of aluminum nitride, 0.45kg of boric anhydride, 0.6kg of magnesium borate whisker, 0.4kg of sodium hexafluoroaluminate and 0.25kg of zirconium tungstate, and then placing the materials together in a V-shaped mixer for fully mixing to obtain a mixture;
(2) placing the obtained mixture in a ball mill, adding absolute ethyl alcohol according to the mass ratio of the mixture to the absolute ethyl alcohol of 1:0.4, and then carrying out ball milling to obtain raw material slurry;
(3) after the obtained raw material slurry is subjected to spray drying, sieving to obtain material particles, and then pressing and forming the material particles to obtain a pressed blank;
(4) and sintering the obtained pressed compact for 5 hours at the constant temperature of 1100 ℃, and naturally cooling to room temperature to obtain the ceramic material.
The ceramic materials prepared in the above examples 1 to 5 and comparative examples 1 to 4 were tested for thermal expansion coefficient, thermal conductivity, thermal diffusivity, oxidation resistance, etc., and the test results are shown in table 1 below.
Wherein, the thermal diffusion coefficient is tested by a flash diffusion method in the prior art; the oxidation resistance is judged according to the oxidation weight gain of the ceramic material after being stored for 100 hours at the high temperature of 1200 ℃; the heat conductivity coefficient can be measured by referring to GB/T5598-2015; the thermal expansion coefficient can be measured by referring to the national standard GB/T34183-2017.
TABLE 1
As can be seen from table 1 above, according to the technical solutions provided in embodiments 1-5 of the present invention, a ceramic material having a high thermal conductivity, a high thermal diffusivity, a high oxygen resistance, and a low thermal expansion coefficient can be prepared.
Secondly, from the comparative data of comparative examples 1 to 4 and example 5 in table 1 above, it can be seen that the thermal expansion coefficient of the ceramic material can be significantly reduced and the thermal conductivity coefficient of the ceramic material and the like can be improved by adding the boron anhydride component, so that the heat resistance and the thermal conductivity of the ceramic material can be improved; by adding sodium hexafluoroaluminate, the thermal diffusivity of the ceramic material can be obviously improved, the thermal conductivity coefficient of the ceramic material can be improved, and the heat transfer uniformity of the ceramic material can be improved; in addition, the yttrium oxide component is added, so that the thermal conductivity coefficient of the ceramic material can be obviously improved, the oxidation weight gain of the ceramic material can be reduced, and the thermal conductivity and the oxidation resistance of the ceramic material can be improved.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (6)
1. A method for preparing a ceramic material having excellent thermal conductivity, comprising the steps of:
mixing 40-60 parts of aluminum nitride, 5-12 parts of boric anhydride, 8-15 parts of magnesium borate whisker, 5-12 parts of sodium hexafluoroaluminate, 3-8 parts of zirconium tungstate and 4-10 parts of yttrium oxide according to parts by weight to obtain a mixture;
placing the mixture into a ball mill, and adding absolute ethyl alcohol for ball milling to obtain raw material slurry;
after the raw material slurry is subjected to spray drying, sieving is carried out to obtain material particles, and the material particles are subjected to compression molding to obtain a green compact;
sintering the green compact, and naturally cooling to obtain the ceramic material;
in the step, the sintering temperature is 1000-1200 ℃.
2. The method for preparing a ceramic material with excellent thermal conductivity according to claim 1, wherein in the step, 45-55 parts by weight of aluminum nitride, 8-10 parts by weight of boric anhydride, 10-13 parts by weight of magnesium borate whisker, 7-9 parts by weight of sodium hexafluoroaluminate, 4-6 parts by weight of zirconium tungstate and 5-7 parts by weight of yttrium oxide are mixed to obtain a mixture.
3. The method for preparing a ceramic material with excellent thermal conductivity according to claim 2, wherein in the step, 50 parts by weight of aluminum nitride, 9 parts by weight of boric anhydride, 12 parts by weight of magnesium borate whisker, 8 parts by weight of sodium hexafluoroaluminate, 5 parts by weight of zirconium tungstate and 6 parts by weight of yttrium oxide are mixed to obtain a mixture.
4. The preparation method of the ceramic material with excellent thermal conductivity according to claim 1, wherein the mass ratio of the mixture to the absolute ethyl alcohol is 1 (0.2-0.6).
5. A ceramic material prepared by the method of any one of claims 1 to 4.
6. The ceramic material of claim 5, wherein the ceramic material has a thermal conductivity of 301.9 to 325.5W/m-K.
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