CN108383513B - Steatite ceramic material and preparation method thereof - Google Patents
Steatite ceramic material and preparation method thereof Download PDFInfo
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- CN108383513B CN108383513B CN201810339873.3A CN201810339873A CN108383513B CN 108383513 B CN108383513 B CN 108383513B CN 201810339873 A CN201810339873 A CN 201810339873A CN 108383513 B CN108383513 B CN 108383513B
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Abstract
The invention relates to the field of ceramic materials, in particular to a steatite ceramic material and a preparation method thereof. A talc ceramic material is prepared from (by weight parts) raw talc powder 87-90, barium carbonate 8-12, and kaolin 0.5-1.5. The talc ceramic material provided by the invention is prepared from raw talc powder, barium carbonate and kaolin according to a certain proportion, the firing temperature range is large, the firing temperature range is 5-30 ℃, and the prepared talc ceramic material has excellent comprehensive performance, particularly excellent insulating property, stable and reliable comprehensive performance and low price.
Description
Technical Field
The invention relates to the field of ceramic materials, in particular to a steatite ceramic material and a preparation method thereof.
Background
The ceramic material is one of the three most important modern materials, and plays an irreplaceable role in national economy, human life and scientific and technological development due to a series of excellent special properties such as high temperature resistance, corrosion resistance, light weight and the like.
With the development of production and scientific technology, the variety of ceramic materials is increasing day by day. The talc porcelain is a ceramic which is very popular in the market at home and abroad at present. The material has the main characteristics of high impact strength and breaking strength, good thermal stability and good insulating property, and is often used as an insulating part. The existing high-quality talc ceramics are expensive.
The sintering range of the low-price talc ceramic is narrow, ceramic blank collapse or deformation is easily caused in the actual sintering process, the sintering temperature is difficult to control, and the insulating property of the talc ceramic needs to be further improved.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide the talc ceramic material, which has the advantages of enlarging the sintering temperature range, improving the product quality and being low in cost.
The second purpose of the invention is to provide the preparation method of the talc ceramic material, and the prepared talc ceramic material has excellent comprehensive performance and stable and reliable performance.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
a talc ceramic material is prepared from (by weight parts) raw talc powder 87-90, barium carbonate 8-12, and kaolin 0.5-1.5.
The talc ceramic material provided by the invention is prepared from raw talc powder, barium carbonate and kaolin according to a certain proportion, the firing temperature range is large, the firing temperature range is 5-30 ℃, and the prepared talc ceramic material has excellent comprehensive performance, particularly excellent insulating property, stable and reliable comprehensive performance and low price.
The invention also provides a talc ceramic material which is prepared from the following raw materials, by weight, 78-82 parts of raw talcum powder, 8-12 parts of kaolin, 7-9 parts of barium carbonate, 1-3 parts of zinc oxide and 1.5-2.5 parts of aluminum oxide micro powder.
The talc ceramic material provided by the invention is prepared from raw talc powder, kaolin, barium carbonate, zinc oxide and aluminum oxide micropowder according to a certain proportion, the firing temperature range is large, the firing temperature is 5-30 ℃, and the prepared talc ceramic material has excellent comprehensive performance, particularly excellent insulating property, stable and reliable comprehensive performance and low price.
The invention also provides a talc ceramic material which is prepared from the following raw materials, by weight, 50-70 parts of calcined talcum powder, 10-25 parts of raw talcum powder, 5-15 parts of kaolin, 1-2 parts of calcined alumina micropowder and 1-10 parts of barium carbonate.
The talc ceramic material provided by the invention is prepared from calcined talc powder, raw talc powder, kaolin, barium carbonate and calcined alumina micropowder according to a certain proportion, the sintering temperature range is large, the sintering temperature is 5-30 ℃, and the prepared talc ceramic material has excellent comprehensive performance, particularly excellent insulating property, stable and reliable comprehensive performance and low price.
Preferably, 60-65 parts of calcined talcum powder, 18-22 parts of raw talcum powder, 8-12 parts of kaolin, 1-2 parts of calcined alumina micropowder and 6-10 parts of barium carbonate.
The invention also provides a talc ceramic material which comprises, by weight, 58-62 parts of calcined talc powder, 18-22 parts of raw talc powder, 8-12 parts of kaolin, 5-7 parts of barium carbonate, 1-3 parts of aluminum oxide micropowder and 1-3 parts of feldspar.
The talc ceramic material provided by the invention is prepared from calcined talc powder, raw talc powder, kaolin, barium carbonate, calcined alumina micropowder and feldspar according to a certain proportion, the sintering temperature range is large, the sintering temperature is 5-30 ℃, and the prepared talc ceramic material has excellent comprehensive performance, particularly excellent insulating performance, stable and reliable comprehensive performance and low price.
The invention also provides a preparation method of the talc ceramic material, which comprises the steps of mixing the raw materials with polyvinyl alcohol glue, carrying out ball milling, filtering, removing bubbles, carrying out spray granulation, carrying out dry pressing molding, and sintering to obtain the talc ceramic material;
the polyvinyl alcohol glue is prepared from polyvinyl alcohol and water in a weight ratio of 2: 400-450, and is prepared by mixing, heating and stewing;
the weight ratio of the raw materials to the water is 1: 1.4-1.7.
According to the preparation method of the talc ceramic material, provided by the invention, the polyvinyl alcohol glue is added for ball milling, the problem of easy collapse of anti-sintering is increased, the sintering temperature range is expanded, and the prepared talc ceramic material is excellent in comprehensive performance, stable and reliable in performance and low in price.
Further, the boiling temperature is 80-120 ℃. Decocting until the polyvinyl alcohol and the water are mutually fused and uniform.
Further, the ball milling time is 45-50 hours.
Through ball milling, particles with proper particle size are obtained, and a good foundation is provided for the preparation of subsequent materials.
Preferably, the filtering screen used for filtering is 100 meshes. The main function of this filtration is to remove iron, which is generally done by means of a vibrating screen. Through filtering, remove impurity, improve the stability of material product to improve the insulating properties of final product.
Further, the defoaming agent used for defoaming is n-butyl alcohol, and the addition amount of the n-butyl alcohol is 0.001-0.003% of the weight of the filtered substances.
By removing bubbles, the compactness of the product and the stability of the performance of the product are increased. By adopting the defoaming agent, a good defoaming effect can be achieved on the product, and the performance of the product is not influenced.
Further, the sintering temperature is 1250-1280 ℃, and the sintering time is 18-25 minutes. By this sintering, a finished product is obtained. In the invention, the sintering is carried out in a medium-temperature kiln, and the time for firing the pushing plate is 18-25 minutes every plate.
Further, the temperature difference of the sintering is 5-30 ℃.
The sintering temperature range can be 5-30 ℃, which is greatly improved compared with the existing 5-10 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention selects the specific material to prepare the steatite porcelain material, thereby reducing the cost, expanding the firing temperature range and improving the product quality.
(2) According to the preparation method of the talc ceramic material, provided by the invention, the polyvinyl alcohol glue is added for ball milling, the problem of easy collapse of anti-sintering is increased, the sintering temperature range is expanded, and the prepared talc ceramic material is excellent in comprehensive performance, stable and reliable in performance and low in price.
(3) The steatite ceramic material prepared by the invention has the advantages of low dielectric constant, low dielectric loss tangent value, high insulating strength, high volume resistivity, higher static bending strength, better chemical stability, acid resistance, alkali resistance, corrosion resistance and low price.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
A steatite porcelain material is prepared by the following method:
taking the following raw materials:
87 parts of raw talcum powder, 8 parts of barium carbonate and 0.5 part of kaolin.
Mixing polyvinyl alcohol and water at a weight ratio of 2:400, heating to 80-100 ℃, decocting until the polyvinyl alcohol and the water are uniformly fused to obtain polyvinyl alcohol glue;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.4;
then ball milling is carried out for 45 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.001 percent of the weight of the filtered substance;
the composite material is prepared by spraying granulation, dry pressing and molding, and sintering in a medium-temperature kiln at 1250-1260 ℃ for one plate every 25 minutes.
Example 2
A steatite porcelain material is prepared by the following method:
taking the following raw materials:
90 parts of raw talcum powder, 12 parts of barium carbonate and 1.5 parts of kaolin.
Mixing polyvinyl alcohol and water according to the weight ratio of 2:450, heating to 100-;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.7;
then ball milling is carried out for 50 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.003 percent of the weight of the filtered substance;
the ceramic is prepared by spraying granulation, dry pressing and molding, and sintering in a medium temperature kiln at 1260-.
Example 3
A steatite porcelain material is prepared by the following method:
taking the following raw materials:
89 parts of raw talcum powder, 10 parts of barium carbonate and 1 part of kaolin.
Mixing polyvinyl alcohol and water according to the weight ratio of 2:420, heating to 100-;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.5;
then ball milling is carried out for 50 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.002 percent of the weight of the filtered substance;
the ceramic is prepared by spraying granulation, dry pressing and molding, and sintering in a medium-temperature kiln at 1250-1270 ℃ for one plate per 20 minutes.
Example 4
A steatite porcelain material is prepared by the following method:
taking the following raw materials:
78 parts of raw talcum powder, 8 parts of kaolin, 7 parts of barium carbonate, 1 part of zinc oxide and 1.5 parts of aluminum oxide micro powder.
Mixing polyvinyl alcohol and water at a weight ratio of 2:400, heating to 80-100 ℃, decocting until the polyvinyl alcohol and the water are uniformly fused to obtain polyvinyl alcohol glue;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.4;
then ball milling is carried out for 45 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.001 percent of the weight of the filtered substance;
the composite material is prepared by spraying granulation, dry pressing and molding, and sintering in a medium-temperature kiln at 1250-1260 ℃ for one plate every 25 minutes.
Example 5
A steatite porcelain material is prepared by the following method:
taking the following raw materials:
80 parts of raw talcum powder, 10 parts of kaolin, 8 parts of barium carbonate, 2 parts of zinc oxide and 2 parts of aluminum oxide micropowder.
The weight ratio of polyvinyl alcohol to water is 2:450, mixing and heating to 110-120 ℃, decocting until the two are mutually fused uniformly to obtain polyvinyl alcohol glue;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.5;
then ball milling is carried out for 48 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.002 percent of the weight of the filtered substance;
the composite material is prepared by spraying granulation, dry pressing and molding, and sintering in a medium-temperature kiln at 1260-.
Example 6
A steatite porcelain material is prepared by the following method:
taking the following raw materials:
82 parts of raw talcum powder, 12 parts of kaolin, 9 parts of barium carbonate, 3 parts of zinc oxide and 2.5 parts of aluminum oxide micro powder.
The weight ratio of polyvinyl alcohol to water is 2:450, mixing and heating to 100-120 ℃, decocting until the two are mutually fused uniformly to obtain polyvinyl alcohol glue;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.7;
then ball milling is carried out for 50 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.003 percent of the weight of the filtered substance;
the ceramic is prepared by spraying granulation, dry pressing and molding, and sintering in a medium temperature kiln at 1260-.
Example 7
A steatite porcelain material is prepared by the following method:
taking the following raw materials:
according to the weight portion, 50 portions of calcined talcum powder, 10 portions of raw talcum powder, 5 portions of kaolin, 1 portion of calcined alumina micropowder and 1 portion of barium carbonate.
The weight ratio of polyvinyl alcohol to water is 2:450, mixing and heating to 80-120 ℃, decocting until the two are mutually fused uniformly to obtain polyvinyl alcohol glue;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.4;
then ball milling is carried out for 50 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.001 percent of the weight of the filtered substance;
the ceramic is prepared by spraying granulation, dry pressing and molding, and sintering in a medium-temperature kiln at 1250-1270 ℃ for one plate per 20 minutes.
Example 8
A steatite porcelain material is prepared by the following method:
taking the following raw materials:
according to the weight portion, 70 portions of calcined talcum powder, 25 portions of raw talcum powder, 15 portions of kaolin, 2 portions of calcined alumina micropowder and 10 portions of barium carbonate.
The weight ratio of polyvinyl alcohol to water is 2:400, mixing, heating to 80-120 ℃, decocting until the two are mutually fused uniformly to obtain polyvinyl alcohol glue;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.7;
then ball milling is carried out for 45 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.003 percent of the weight of the filtered substance;
the ceramic is prepared by spraying granulation, dry pressing and molding, and sintering in a medium temperature kiln at 1260-.
Example 9
A steatite porcelain material is prepared by the following method:
taking the following raw materials:
60 parts of calcined talcum powder, 18 parts of raw talcum powder, 8 parts of kaolin, 1 part of calcined aluminum oxide micro powder and 6 parts of barium carbonate.
The weight ratio of polyvinyl alcohol to water is 2:420, mixing and heating to 100-110 ℃, decocting until the two are mutually fused uniformly to obtain polyvinyl alcohol glue;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.5;
then ball milling is carried out for 48 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.002 percent of the weight of the filtered substance;
the composite material is prepared by spraying granulation, dry pressing and molding, and sintering in a medium-temperature kiln at the sintering temperature of 1250-1280 ℃ for one plate every 20 minutes.
Example 10
A steatite porcelain material is prepared by the following method:
taking the following raw materials:
according to the weight portion, 65 portions of calcined talcum powder, 22 portions of raw talcum powder, 12 portions of kaolin, 2 portions of calcined alumina micropowder and 10 portions of barium carbonate.
The weight ratio of polyvinyl alcohol to water is 2:420, mixing and heating to 100-110 ℃, decocting until the two are mutually fused uniformly to obtain polyvinyl alcohol glue;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.6;
then ball milling is carried out for 48 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.002 percent of the weight of the filtered substance;
the composite material is prepared by spraying granulation, dry pressing and molding, and sintering in a medium-temperature kiln at 1260-.
Example 11
A steatite porcelain material is prepared by the following method:
taking the following raw materials:
60 parts of calcined talcum powder, 20 parts of raw talcum powder, 10 parts of kaolin, 6 parts of barium carbonate, 2 parts of aluminum oxide micro powder and 2 parts of feldspar.
The weight ratio of polyvinyl alcohol to water is 2:420, mixing and heating to 100-110 ℃, decocting until the two are mutually fused uniformly to obtain polyvinyl alcohol glue;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.5;
then ball milling is carried out for 48 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.002 percent of the weight of the filtered substance;
the composite material is prepared by spraying granulation, dry pressing and molding, and sintering in a medium-temperature kiln at 1260-.
Example 12
A steatite porcelain material is prepared by the following method:
taking the following raw materials:
58 parts of calcined talcum powder, 18 parts of raw talcum powder, 8 parts of kaolin, 5 parts of barium carbonate, 1 part of aluminum oxide micro powder and 1 part of feldspar.
The weight ratio of polyvinyl alcohol to water is 2:400, mixing, heating to 80-100 ℃, decocting until the two are mutually fused uniformly to obtain polyvinyl alcohol glue;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.4;
then ball milling is carried out for 45 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.003 percent of the weight of the filtered substance;
the material is prepared by spraying granulation, dry pressing and molding, and sintering in a medium-temperature kiln at 1250-1270 ℃ for one plate every 25 minutes.
Example 13
A steatite porcelain material is prepared by the following method:
taking the following raw materials: 62 parts of calcined talcum powder, 22 parts of raw talcum powder, 12 parts of kaolin, 7 parts of barium carbonate, 3 parts of aluminum oxide micro powder and 3 parts of feldspar.
The weight ratio of polyvinyl alcohol to water is 2:450, mixing and heating to 100-120 ℃, decocting until the two are mutually fused uniformly to obtain polyvinyl alcohol glue;
mixing the raw materials with polyvinyl alcohol glue, wherein the weight ratio of the raw materials to water is 1: 1.7;
then ball milling is carried out for 50 hours;
filtering the ball-milled product by a vibrating screen with a 100-mesh filter screen to remove iron;
then adding n-butyl alcohol, stirring and removing bubbles, wherein the addition amount of the n-butyl alcohol is 0.001 percent of the weight of the filtered substance;
the ceramic is prepared by spraying granulation, dry pressing and molding, and sintering in a medium temperature kiln at 1260-.
Comparative example 1
The raw materials are as follows: 45 parts of calcined talcum powder, 35 parts of raw talcum powder, 12 parts of kaolin, 2.5 parts of zinc oxide, 0.5 part of zirconium silicate and 5 parts of barium carbonate.
The processing technology is as follows:
wet ball milling with water as solvent, spray drying, dry pressing to form and high temperature sintering.
The sintering temperature was 1300 ℃.
The manufacturing cost is high.
Comparative example 2
The raw materials are as follows:
53 parts of talc, 27 parts of kaolin, 17 parts of potassium feldspar and 3 parts of alumina;
the raw materials are put into a ball mill for ball milling, and are sequentially sieved, deironing, filter pressing, pugging, aging and forming, and then are sintered into porcelain at 1180-1230 ℃.
Comparative example 3
The raw materials are as follows:
20 parts of raw talc, 80 parts of calcined talc, 5 parts of bentonite, 3 parts of kaolin and 5 parts of barium carbonate;
the raw materials are put into a ball mill, ball milled for 35 hours, sequentially screened, dehydrated, pugging, aged and formed (the specific parameters are carried out according to example 3 of application No. 201510318167.7), and then sintered into porcelain at 1300 ℃.
Comparative example 4
Unlike example 3, the ball milling was performed without using a polyvinyl alcohol glue, and the polyvinyl alcohol was removed therefrom. The rest is the same.
Comparative example 5
Unlike example 5, the ball milling was performed without using a polyvinyl alcohol glue, and the polyvinyl alcohol was removed therefrom. The rest is the same.
Comparative example 6
Unlike example 9, the ball milling was performed without using a polyvinyl alcohol glue, and the polyvinyl alcohol was removed therefrom. The rest is the same.
Comparative example 7
Unlike example 11, the ball milling was not performed using a polyvinyl alcohol glue, and the polyvinyl alcohol was removed therefrom. The rest is the same.
The talc porcelain materials obtained in examples 1 to 13 and comparative examples 1 to 7 were subjected to property tests, and the results are shown in Table 1.
TABLE 1 Properties
In addition, the chemical stability of each group is obviously better than that of comparative examples 4-7 in acid resistance, alkali resistance and corrosion resistance (atmosphere, water and the like).
In conclusion, the talc ceramic material provided by the invention has the advantages of low dielectric constant, low dielectric loss tangent value, high insulating strength, high volume resistivity, excellent insulating property, higher static bending strength, better chemical stability, acid resistance, alkali resistance, corrosion resistance, stable and reliable comprehensive performance and low price.
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (7)
1. The talc ceramic material is characterized by being prepared from the following raw materials, by weight, 58-62 parts of calcined talcum powder, 18-22 parts of raw talcum powder, 8-12 parts of kaolin, 5-7 parts of barium carbonate, 1-3 parts of aluminum oxide micro powder and 1-3 parts of feldspar;
the preparation method of the talc ceramic material comprises the steps of mixing the raw materials with polyvinyl alcohol glue, then carrying out ball milling, filtering, removing bubbles, carrying out spray granulation, carrying out dry pressing molding, and sintering to obtain the talc ceramic material;
the polyvinyl alcohol glue is prepared from polyvinyl alcohol and water in a weight ratio of 2: 400-450, and is prepared by mixing, heating and stewing;
the weight ratio of the raw materials to the water is 1: 1.4-1.7.
2. The steatite porcelain material as claimed in claim 1, wherein said temperature of said boiling is 80-120 ℃.
3. The talc ceramic material of claim 1, wherein said ball milling time is 45-50 hours.
4. The talc ceramic material of claim 1, wherein said filter mesh is 100 mesh.
5. The talc ceramic material according to claim 1, wherein said defoaming agent is n-butanol, and the amount of n-butanol is 0.001% -0.003% by weight of the filtered material.
6. The talc ceramic material according to any of claims 2 to 5, wherein firing temperature is 1250-.
7. The talc ceramic material of claim 6, wherein said firing temperature difference is 5-30 ℃.
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| SU1719367A1 (en) * | 1989-10-23 | 1992-03-15 | Особое Конструкторское Бюро При Южноуральском Заводе Радиокерамики | Steatite ceramic material |
| RO119613B1 (en) * | 1998-03-04 | 2005-01-28 | S.C. Silox Srl | Process for making heat-resistant ceramic products |
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| EP3230232B1 (en) * | 2014-12-10 | 2018-08-15 | Institut "Jozef Stefan" | Production method of steatite ceramics with improved electrical properties |
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