CN115974524A - Preparation method of low-dielectric-constant insulating ceramic - Google Patents
Preparation method of low-dielectric-constant insulating ceramic Download PDFInfo
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
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- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
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- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a preparation method of low dielectric constant insulating ceramic, which comprises the following steps: weighing raw materials of coal gangue, phosphate tailings and quartz for later use; (2) Putting the weighed raw materials into a rapid ball mill, carrying out ball milling, wherein the ball milling medium is agate ball mill, the grinding medium is deionized water, after grinding, putting the uniformly mixed raw materials into a drying box for drying, and sieving after drying; (3) Adding polyvinyl alcohol solution into the sieved raw materials and then granulating; (4) The granulated raw materials are aged and then put into a die for compression molding; (5) And finally, putting the molded green body into a muffle furnace for firing to obtain the required insulating ceramic. Wherein the mass ratio of the coal gangue to the phosphate tailings to the quartz is (22.5-37.5): (40-50): (22.5-27.5). The invention prepares the ceramic material by using low-grade raw materials, effectively shields the influence of harmful impurities in solid wastes on the performance of the ceramic, and prepares the insulating ceramic with high mechanical property, low dielectric constant and dielectric loss.
Description
Technical Field
The invention relates to the field of ceramic material preparation, and in particular relates to a preparation method of low-dielectric-constant insulating ceramic.
Background
Low-grade raw materials refer to low-grade, low-value raw materials, including bulk aluminosilicate solid wastes such as: coal gangue, fly ash, tailings, red mud, steel slag and the like. And also includes some rock minerals such as shale, sandstone, etc. The raw materials have complex components and high impurity content, and are difficult to realize resource utilization. In addition, the large amount of solid waste of the bulk aluminosilicate is large, so that water and soil pollution is easily caused, and the solid waste has great harm to the natural environment. How to effectively and reasonably utilize the low-grade raw materials has important significance on energy conservation, emission reduction and resource utilization in China.
The low-grade raw material contains more CaO and Al 2 O 3 MgO and SiO 2 And the like, and can be used as raw materials for preparing ceramics. There has been a great deal of research into the use of low grade raw materials for the production of foamed ceramics and ceramic tiles. The Chinese patent (202210443515.3) discloses a method for preparing porous ceramics by using mine solid wastes. The Chinese invention patent (202010941092.9) discloses a method for preparing ceramic tiles by using ceramic waste and red mud. The Chinese invention patent (201710570081.2) discloses a ceramic water permeable brick taking industrial inorganic hazardous waste and low-grade aluminum-silicon mineral as raw materials and a preparation method thereof. The compressive strength of the prepared ceramic water permeable brick is not lower than 40MPa, and the water permeability coefficient is not lower than 1.5x10 -2 cm/s and the length of the grinding pit is not more than 30mm. However, these methods have not been applied on a large scale because of the low economic value of the above products.
The insulating ceramic is a ceramic with excellent insulating performance and good mechanical performance, and basic requirements include small dielectric constant, low dielectric loss, good mechanical strength, high insulating resistivity, high dielectric strength, good temperature, humidity and frequency stability and the like. Is widely applied to various insulators, electronic element packaging shells, integrated circuit substrates, packaging shells and the like, and is provided withHigh economic value. A Chinese patent (201810636136. X) discloses a method for preparing MgO-Al from tailings 2 O 3 -SiO 2 The product prepared by the method has the advantages of high temperature resistance, small dielectric loss, stable dielectric constant and excellent electrical insulation. The Chinese invention patent (202110729077.2) discloses a method for preparing microwave dielectric ceramics by using sludge of an electronic factory. The main component of the sludge of the electronic factory comprises CaSO 4 And Al (OH) 3 To which TiO is added 2 And the microwave dielectric ceramic prepared from the rare earth oxide has good dielectric constant and resonant frequency coefficient close to zero. The two methods are mainly used for MgO-Al 2 O 3 -SiO 2 System and CaO-Al 2 O 3 The raw materials of the system have small application range. Meanwhile, the content of impurity elements in the adopted raw materials is low. Therefore, the restriction is large, and the method is not beneficial to being applied to low-grade raw materials with complex components and more impurities.
Disclosure of Invention
In order to solve the technical problems, the invention provides a preparation method of low dielectric constant insulating ceramic, which is characterized in that a ceramic material is prepared from low-grade raw materials, so that the influence of harmful impurities in solid wastes on the performance of the ceramic is effectively shielded, and the insulating ceramic with high mechanical property, low dielectric constant and dielectric loss is prepared.
The technical scheme provided by the invention is as follows:
a preparation method of low dielectric constant insulating ceramic comprises the following steps:
(1) Weighing raw materials of coal gangue, phosphate tailings and quartz for later use;
(2) Putting the weighed raw materials into a rapid ball mill, carrying out ball milling, wherein the ball milling medium is agate ball mill, the grinding medium is deionized water, after grinding, putting the uniformly mixed raw materials into a drying box for drying, and sieving after drying;
(3) Adding polyvinyl alcohol solution into the sieved raw materials and then granulating;
(4) The granulated raw materials are aged and then put into a die for compression molding;
(5) And finally, putting the molded green body into a muffle furnace for firing to obtain the required insulating ceramic.
Wherein the mass ratio of the coal gangue to the phosphate tailings to the quartz is (22.5-37.5): (40-50): (22.5-27.5).
Wherein, the coal gangue and the phosphate tailings are respectively pretreated by the following methods before being weighed:
putting the coal gangue or the phosphorus tailings into a rapid ball mill for ball milling for 12 hours, wherein the ball-to-material ratio is 1:2, after ball milling, sieving by a 200-mesh sieve for later use.
The ball milling in the step (2) comprises the following specific steps: ball-milling and mixing for 12h at 500 r/min, wherein the ball-milling medium is agate ball mill, the grinding medium is deionized water, and the material is as follows: ball: the weight ratio of water is 1:1:1.5.
wherein the drying conditions of the step (2) are as follows: after grinding, the uniformly mixed raw materials are put into a drying oven to be dried for 24 hours, and the temperature of the drying oven is set to be 100 ℃.
Wherein, the dried raw materials in the step (2) are screened by a 200-mesh sieve for later use.
Wherein, in the step (3), a polyvinyl alcohol solution with the weight ratio of 10% and the concentration of 5wt% is added into the sieved raw materials, and then granulation is carried out.
Wherein the ageing time in the step (4) is 24h.
And (3) in the step (4), the pressure for compression molding in the mold is 20MPa, and the pressure is maintained for 1min.
Wherein the firing conditions in the step (5) are as follows: the temperature rising rate is 5 ℃/min, the temperature is 1170-1190 ℃, the heat preservation time is 2h, and the temperature reduction rate is 5 ℃/min, thus obtaining the required insulating ceramic.
Compared with the prior art, the preparation method of the low dielectric constant insulating ceramic provided by the invention has the advantages that the specific low-grade raw materials are utilized to prepare the insulating ceramic material under the specific preparation method, the chemical composition of the low-grade raw materials is designed, the crystal structure of the ceramic is changed, the influence of harmful impurities in solid wastes on the performance of the ceramic is effectively shielded, and the insulating ceramic with high mechanical property, low dielectric constant and dielectric loss is prepared. Is a new method with wide application and high economic benefit.
Considering the chemical composition of the low-grade raw material, the chemical composition mainly comprises: caO, siO 2 ，Al 2 O 3 MgO, etc., the main mineral phase of the insulating ceramic prepared by the invention is designed into anorthite and diopside, the melting point of the anorthite is 1553 ℃, the density is 2.76g/cm < 3 >, and the insulating ceramic has a lower thermal expansion coefficient. The dielectric constant at 1MHz was 6.2 and the flexural strength was 103MPa. The melting point of diopside is 1390 deg.C, and the density is 3.40g/cm3. The dielectric constant under 1MHz is 7.5, and the flexural strength can reach 300MPa. The ceramics with the two minerals as main crystal phases have good insulating property and mechanical property. Meanwhile, magnesium ions and a plurality of impurity ions such as iron, titanium, manganese, sodium and the like in diopside have homogeneous images, namely, the positions of some ions, atoms or molecules in the crystal structure are occupied by a part of other ions, atoms or molecules with similar properties, but the crystal structure type, the chemical bond type and the balance of positive and negative charges of the ions are kept unchanged or basically unchanged, and only physical properties such as unit cell parameters, refractive index, specific gravity and the like are changed. The impurity ions in the solid wastes are dissolved into diopside crystal lattices in a solid solution manner, so that the dielectric loss of the ceramic can be obviously reduced, and the failure of the ceramic due to large-scale heat generation in the service process is avoided. The important difficulty of preparing the insulating ceramic by using the low-grade raw materials is that the components are complex and contain more elements harmful to the performance of the ceramic, and the design scheme of the invention can obviously shield the influence of impurity elements in the low-grade raw materials on the dielectric performance of the insulating ceramic.
Compared with the prior art, the invention also has the following advantages:
(1) The insulating ceramic is prepared by using the low-grade raw materials, the utilization rate reaches over 69.4 percent, large-scale resource utilization of the low-grade raw materials can be realized, industrial solid wastes can be recycled in a large amount, exploitation of high-grade ceramic raw material ores can be reduced, and the environment benefit is high.
(2) The main mineral phase of the ceramic is designed into anorthite and diopside with excellent dielectric property and mechanical property, impurities in low-grade raw materials are dissolved into the diopside in a solid mode, and the influence of impurity elements on the performance of the ceramic is effectively shielded. The prepared insulating ceramic has good physical property, mechanical property and dielectric property, can be applied to ceramic substrates or insulators used in the power transmission process, and has great economic benefit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a back-scattered scanning electron image of an insulating ceramic prepared in example 1;
FIG. 2 is a back-scattered scanning electron diagram of the insulating ceramic obtained in comparative example 1.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
The materials used in the examples of the present specification are.
Polyvinyl alcohol: the model is 1750 +/-50 of polyvinyl alcohol, the CAS number is 9002-89-5, and the national drug number is 30153160;
quartz: shanghai Michelin Biochemical technology, inc., CAS number: [7631-86-9], molecular weight: 60.08 of the raw materials;
coal gangue: the detection shows that the major mineral phases of Shanxi Shuozhou coal washery are kaolinite and iron disulfide;
phosphate tailings: in Guizhou, the main mineral phases detected were dolomite and fluorapatite.
Example 1
(1) Respectively carrying out the following pretreatment on solid wastes, namely coal gangue and phosphate tailings: after crushing, putting the mixture into a rapid ball mill for ball milling for 12 hours, wherein the ball-material ratio is 1:2, after ball milling, sieving the mixture through a 200-mesh sieve for later use, weighing the sieved coal gangue, phosphate tailings and quartz, wherein the raw materials comprise the following components in parts by weight: 22.5 parts of coal gangue, 50 parts of phosphate tailings and 27.5 parts of quartz.
(2) Putting the weighed raw materials into a rapid ball mill, and carrying out ball milling and mixing for 12h at the speed of 500 revolutions per minute, wherein the ball milling medium is agate ball mill, and the grinding medium is deionized water: ball: the weight ratio of water is 1:1:1.5, after uniformly mixing, putting the raw materials into a drying oven for drying for 24 hours. The temperature of the drying oven is set to 100 ℃, and the dried raw materials are sieved by a 200-mesh sieve for later use.
(3) Adding 10 wt% of polyvinyl alcohol solution with the concentration of 5wt% into the sieved raw materials, and granulating;
(4) Ageing the granulated raw materials for 24 hours, then putting the raw materials into a mould for compression molding, keeping the pressure at 20MPa for 1min;
(5) And finally, placing the molded green body into a muffle furnace for firing, wherein the firing conditions are as follows: the temperature rise rate is 5 ℃/min, the temperature is 1190 ℃, the heat preservation time is 2 hours, and the temperature drop rate is 5 ℃/min, thus obtaining the required insulating ceramic.
The obtained insulating ceramic was subjected to back-scattering scanning, and the scanning pattern is shown in FIG. 1. FIG. 1 is a back-scattered scanning electron image of a sample fired at 1190 ℃ and shows that the main mineral phases of the prepared insulating ceramic are diopside, anorthite and calcium phosphate. The relative contents of diopside, anorthite and calcium phosphate were obtained by Rietveld full-spectrum fit refinement of the slow-scan XRD data of the ceramic samples by fullprrof software. The results show that the sample of example 1 had a diopside content of 69.37%, an anorthite content of 24.29%, and a calcium phosphate content of 6.34%. The density and porosity of the sample were calculated based on the principles of archimedes drainage. The test results showed that the density of the sample in example 1 was 2.86g/cm 3 The porosity was 0.20%.
Example 2
(1) Respectively carrying out the following pretreatment on solid waste coal gangue and phosphorus tailings: after crushing, putting the mixture into a rapid ball mill for ball milling for 12 hours, wherein the ball-material ratio is 1:2, after ball milling, sieving the mixture by a 200-mesh sieve for later use, weighing the sieved coal gangue, phosphate tailings and quartz, wherein the raw materials comprise the following components in parts by weight: 30 parts of coal gangue, 45 parts of phosphate tailings and 25 parts of quartz.
(2) Putting the weighed raw materials into a rapid ball mill, and carrying out ball milling and mixing for 12h at the speed of 500 revolutions per minute, wherein the ball milling medium is agate ball mill, and the grinding medium is deionized water: ball: the weight ratio of water is 1:1:1.5, after uniformly mixing, putting the raw materials into a drying oven for drying for 24 hours. The temperature of the drying oven is set to be 100 ℃, and the dried raw materials are sieved by a 200-mesh sieve for later use.
(3) Adding 10 wt% of polyvinyl alcohol solution with the concentration of 5wt% into the sieved raw materials, and granulating;
(4) Ageing the granulated raw materials for 24 hours, then putting the raw materials into a mould for compression molding, keeping the pressure at 20MPa for 1min;
(5) And finally, placing the molded green body into a muffle furnace for firing, wherein the firing conditions are as follows: the heating rate is 5 ℃/min, the temperature is 1180 ℃, the heat preservation time is 2 hours, and the cooling rate is 5 ℃/min, thus obtaining the required insulating ceramic.
The analysis result shows that: example 2 the main mineral phases of the prepared insulating ceramic were diopside, anorthite and a small amount of calcium phosphate. The content of diopside was 60.01%, the content of anorthite was 34.54%, the content of calcium phosphate was 5.45%, the density was 2.74g/cm3, and the porosity was 0.31% as measured by the test method of example 1.
Example 3
(1) Respectively carrying out the following pretreatment on solid waste coal gangue and phosphorus tailings: after crushing, putting the mixture into a rapid ball mill for ball milling for 12 hours, wherein the ball-material ratio is 1:2, after ball milling, sieving the mixture by a 200-mesh sieve for later use, weighing the sieved coal gangue, phosphate tailings and quartz, wherein the raw materials comprise the following components in parts by weight: 37.5 parts of coal gangue, 40 parts of phosphate tailings and 22.5 parts of quartz.
(2) Putting the weighed raw materials into a rapid ball mill, and carrying out ball milling and mixing for 12h at the speed of 500 revolutions per minute, wherein the ball milling medium is agate ball mill, and the grinding medium is deionized water: ball: the weight ratio of water is 1:1:1.5, after being uniformly mixed, the raw materials are put into a drying oven to be dried for 24 hours. The temperature of the drying oven is set to be 100 ℃, and the dried raw materials are sieved by a 200-mesh sieve for later use.
(3) Adding 10 wt% of polyvinyl alcohol solution with the concentration of 5wt% into the sieved raw materials, and granulating;
(4) Ageing the granulated raw materials for 24 hours, then putting the aged raw materials into a mould for compression molding, keeping the pressure at 20MPa for 1min;
(5) And finally, placing the molded green body into a muffle furnace for firing, wherein the firing conditions are as follows: the temperature rise rate is 5 ℃/min, the temperature is 1170 ℃, the heat preservation time is 2h, and the temperature drop rate is 5 ℃/min, thus obtaining the required insulating ceramic.
The analysis result shows that: the main mineral phases of the insulating ceramic prepared in example 3 are diopside, anorthite and a small amount of calcium phosphate. According to the measurement method of example 1, the diopside content is 49.45%, the anorthite content is 45.89%, the calcium phosphate content is 4.66%, the density is 2.69g/cm3, and the porosity is 0.08%.
Comparative example 1
(1) Respectively carrying out the following pretreatment on solid wastes, namely coal gangue and phosphate tailings: after crushing, putting the mixture into a rapid ball mill for ball milling for 12 hours, wherein the ball-to-material ratio is 1:2, after ball milling, sieving the mixture by a 200-mesh sieve for later use, weighing the sieved coal gangue, phosphate tailings and quartz, wherein the raw materials comprise the following components in parts by weight: 45 parts of coal gangue, 35 parts of phosphate tailings and 20 parts of quartz.
(2) Putting the weighed raw materials into a rapid ball mill, and carrying out ball milling and mixing for 12h at the speed of 500 revolutions per minute, wherein the ball milling medium is agate ball mill, and the grinding medium is deionized water: ball: the weight ratio of water is 1:1:1.5, after uniformly mixing, putting the raw materials into a drying oven for drying for 24 hours. The temperature of the drying oven is set to 100 ℃, and the dried raw materials are sieved by a 200-mesh sieve for later use.
(3) Adding 10 wt% of polyvinyl alcohol solution with the concentration of 5wt% into the sieved raw materials, and granulating;
(4) Ageing the granulated raw materials for 24 hours, then putting the aged raw materials into a mould for compression molding, keeping the pressure at 20MPa for 1min;
(5) And finally, placing the molded green body into a muffle furnace for firing, wherein the firing conditions are as follows: the heating rate is 5 ℃/min, the temperature is 1160 ℃, the heat preservation time is 2h, and the cooling rate is 5 ℃/min, thus obtaining the required insulating ceramic.
The analysis result shows that: the sample prepared in comparative example 1 had an anorthite content of 63.24%, a diopside content of 31.69%, and a calcium phosphate content of 5.37%. FIG. 2 is a back-scattered scanning electron diagram of the insulating ceramic prepared in comparative example 1. It can be observed that: in addition to the above-mentioned crystalline phases, fe is also present 2 O 3 And (4) phase(s). This is due to the fact that the diopside content is low, resulting in the inability of iron ions to dissolve into the diopside lattice.
The insulating ceramics obtained in example 1, example 2, example 3 and comparative example 1 were subjected to the following mechanical properties and dielectric properties test methods, and the results are shown in table 1.
And (3) testing the breaking strength: the flexural strength of the samples was measured using a universal testing machine. The span and loading rate were 30mm and 0.5mm, respectively. The flexural strength of the samples was obtained from the average of the flexural strengths of the six samples.
And (3) dielectric property test: the dielectric properties of the samples were tested by a Agilent multifunctional impedance tester (radial Agilent E4980A). The sample was first evenly coated with silver paste on both sides and fired at 800 ℃ for 0.5h as an electrode. The capacitance value obtained by testing is determined by using the formula epsilon = Ch/epsilon 0 S calculating the dielectric constant of the sample. Wherein C is the capacitance obtained by the test; h is the sample thickness; epsilon 0 Is a vacuum dielectric constant; s is the area of the sample. The dielectric loss was measured directly by the tester.
TABLE 1 Properties of insulating ceramics
| Flexural strength (MP)a) | Dielectric constant | Dielectric loss | |
| Example 1 | 173.72 | 7.79 | 0.0024 |
| Example 2 | 153.80 | 7.16 | 0.0041 |
| Example 3 | 136.91 | 7.07 | 0.0067 |
| Comparative example 1 | 127.71 | 6.98 | 0.0086 |
As can be seen from the data results of the mechanical properties and the dielectric properties of examples 1-3 and comparative example 1 in the table, the insulating ceramics prepared by selecting raw materials with specific proportions in examples 1, 2 and 3 by a specific preparation method have high diopside content, impurity ions can be greatly dissolved into diopside lattices, the mechanical properties of samples are obviously improved, and the dielectric loss can be greatly reduced. And impurity ions exist in a liquid phase or in the form of a crystalline phase, as shown in comparative example 1. The dielectric loss of the sample is obviously improved, which is not beneficial to the service of the insulating ceramic.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A preparation method of low dielectric constant insulating ceramic is characterized by comprising the following steps:
(1) Weighing raw materials of coal gangue, phosphate tailings and quartz for later use;
(2) Putting the weighed raw materials into a rapid ball mill, carrying out ball milling, wherein the ball milling medium is agate ball mill, the grinding medium is deionized water, after grinding, putting the uniformly mixed raw materials into a drying box for drying, and sieving after drying;
(3) Adding polyvinyl alcohol solution into the sieved raw materials and then granulating;
(4) The granulated raw materials are aged and then put into a mould for compression molding;
(5) And finally, putting the molded green body into a muffle furnace for firing to obtain the required insulating ceramic.
2. The method of preparing a low dielectric constant insulating ceramic according to claim 1, wherein:
the mass ratio of the coal gangue to the phosphate tailings to the quartz is (22.5-37.5): (40-50): (22.5-27.5).
3. The method of preparing a low dielectric constant insulating ceramic according to claim 1 or 2, wherein:
the coal gangue and the phosphate tailings are respectively pretreated by the following methods before being weighed:
putting the coal gangue or the phosphorus tailings into a rapid ball mill for ball milling for 12 hours, wherein the ball-to-material ratio is 1:2, ball milling and sieving with a 200-mesh sieve for later use.
4. The method of preparing a low dielectric constant insulating ceramic according to claim 1 or 2, wherein:
the ball milling in the step (2) comprises the following specific steps: ball-milling and mixing for 12h at 500 r/min, wherein the ball-milling medium is agate ball mill, the grinding medium is deionized water, and the material is as follows: ball: the weight ratio of water is 1:1:1.5.
5. the method of preparing a low dielectric constant insulating ceramic according to claim 1 or 2, wherein:
the drying conditions of the step (2) are as follows: after grinding, the uniformly mixed raw materials are put into a drying oven to be dried for 24 hours, and the temperature of the drying oven is set to be 100 ℃.
6. The method of preparing a low dielectric constant insulating ceramic according to claim 1 or 2, wherein:
and (3) sieving the dried raw materials in the step (2) by a 200-mesh sieve for later use.
7. The method of preparing a low dielectric constant insulating ceramic according to claim 1 or 2, wherein:
specifically, in the step (3), a polyvinyl alcohol solution with a weight ratio of 10% and a concentration of 5wt% is added to the sieved raw materials, and then granulation is performed.
8. The method of preparing a low dielectric constant insulating ceramic according to claim 1 or 2, wherein:
the ageing time in the step (4) is 24h.
9. The method of preparing a low dielectric constant insulating ceramic according to claim 1 or 2, wherein:
and (5) in the step (4), the pressure for compression molding in the die is 20MPa, and the pressure is maintained for 1min.
10. The method of preparing a low dielectric constant insulating ceramic according to claim 1 or 2, wherein:
the firing conditions of the step (5) are as follows: the temperature rising rate is 5 ℃/min, the temperature is 1170-1190 ℃, the heat preservation time is 2h, and the temperature reduction rate is 5 ℃/min, thus obtaining the required insulating ceramic.
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