CN104177119B - A kind of preparation method of light flyash heat insulating porous ceramics - Google Patents
A kind of preparation method of light flyash heat insulating porous ceramics Download PDFInfo
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Abstract
The present invention relates to a kind of preparation method of light flyash heat insulating porous ceramics.Preparation manipulation step is as follows: (1) gets flyash, glass powder, dispersion agent and suds-stabilizing agent, and add water stirring ball-milling, obtains elementary slurry; (2) preparation is containing the stable ceramic size of agar; (3) add tensio-active agent, stir the foamed slurry that foams to obtain; (4) foamed slurry is poured in mould, self-vulcanizing; (5) demoulding is dry obtains porous ceramics green compact; (6) by porous ceramics green compact low-temperature sintering, porous ceramics is obtained.The present invention make use of flyash to greatest extent, and in addition, adopt the agar decomposing non-environmental-pollution as gelifying agent, consumption can be low to moderate 0.1wt%, meets low-carbon environment-friendly policy.The porosity of porous ceramics prepared by the present invention is 88 ~ 91%, and density is 0.24 ~ 0.31g/cm
3, thermal conductivity is 0.051 ~ 0.072W/ (mK), and ultimate compression strength is 0.4 ~ 1.0MPa.
Description
Technical field
The invention belongs to novel light lagging material technical field, that be specifically related to is a kind of preparation method of light flyash heat insulating porous ceramics.
Background technology
The present economy of China is in the period of high speed development, and the energy and environmental issue become increasingly conspicuous, and is just meeting the current strategy of sustainable development at the architectural energy-conserving and environment-protective strategy that carries out.Due to relation between supply and demand, the development of China's lagging material is extremely rapid.The advantages such as porous ceramics is little with its volume density, void content large, lower thermal conductivity, as heat preserving and insulating material, have huge development and apply prospect in daily life and in producing.
When porous ceramics is used as heat preserving and insulating material, while guaranteed performance excellence, also need to consider its raw material sources and preparation technology.Compared to other ceramic raw materials, flyash easy-sintering generates mullite ceramic, and with low cost, has special potential using value to the aspect such as utilization of waste material, environmental protect.Therefore, utilize flyash solid waste, research and develop a kind of production cost low, have the Environment-friendlytype type refractory material of lightweight, insulation, heat insulating function concurrently simultaneously, realize comprehensive utilization of resources, both can solve problem of environmental pollution, make again resource be utilized effectively, no matter be social benefit or economic benefit, be all with a wide range of applications.Nowadays the main preparation technology of porous ceramics has: microwave heating, interpolation pore-forming material, sol-gel processing, organic foam coating, particle packing, foaming etc.The people such as Li Shaorong are with organic resin foam microspheres for pore-forming material prepares porous ceramics, and its uniform pore diameter, size are controlled, but when organic pore-forming agents burnouts, the gas of discharge pollutes the environment, and do not meet environmental protection policy; The people such as Wu Yongbin prepare porous ceramic composite with protein foaming, do not produce the objectionable impurities of contaminate environment, but more protein adds and a large amount of gases of discharge of finally burnouting, and do not meet low-carbon environment-friendly policy.
Summary of the invention
Object of the present invention, providing with flyash is raw material, utilize mechanical stirring to foam and agar gel solidify combine a kind of low cost, lightweight, high porosity, lower thermal conductivity the preparation method of heat insulating porous ceramics.
The preparation method of light flyash heat insulating porous ceramics comprises the raw material powder coal ash 30 ~ 40wt% of following mass percent, agar powder 0.1 ~ 0.5wt%, suds-stabilizing agent 0.15 ~ 0.2wt%, dispersion agent 0.1 ~ 0.15wt%, glass powder 0 ~ 4wt%, whipping agent 0.3 ~ 0.5wt% and water 54.65 ~ 64.75wt%;
Described suds-stabilizing agent is Sodium hexametaphosphate 99, and described dispersion agent is sodium polyacrylate, and described whipping agent is sodium lauryl sulphate or Sodium dodecylbenzene sulfonate;
Preparation manipulation step is:
(1) by flyash, glass powder, dispersion agent and suds-stabilizing agent, add water ball milling after stirring, and obtains elementary slurry;
(2) preparation is containing the stable ceramic size of agar;
(3) add tensio-active agent, stir the foamed slurry that foams to obtain;
(4) foamed slurry is poured in mould, self-vulcanizing;
(5) demoulding is dry obtains porous ceramics green compact;
(6) porous ceramics green compact are sintered in low-temperature sintering stove, obtain porous ceramics.
The porosity of described porous ceramics is 88 ~ 91wt%, and density is 0.24 ~ 0.31g/cm
3, thermal conductivity is 0.051 ~ 0.072 W/ (mK), and ultimate compression strength is 0.4 ~ 1.0MPa.The porosity of porous ceramics prepared by the present invention is 88 ~ 91wt%, and density is 0.24 ~ 0.31g/cm
3, thermal conductivity is 0.051 ~ 0.072 W/ (mK), and ultimate compression strength is 0.4 ~ 1.0MPa.
Compared with existing porous ceramics heat preserving and insulating material, advantage of the present invention is:
1, the porous ceramics that prepared by the present invention has uniform spherical honeycomb porous structure unit, and hole wall is interconnected with hole window, and porosity can reach more than 88%, and sample surfaces is regular, forming;
2, the present invention adopts frothy gel injection molding preparation technology, is combined by stirring foaming process with slip-casting shaping process, and it is simple that this technique has degreasing process, feature with short production cycle, the hole rounding of prepared porous ceramics, and strength ratio is higher;
3, the porous ceramics raw material that prepared by the present invention is flyash solid waste, other are micro-additive, after sintering, finished product component almost comes from flyash completely, solid waste can be utilized to greatest extent, both problem of environmental pollution was solved, make again resource be utilized effectively, this is with a wide range of applications; In addition adopt agar as gelifying agent, consumption considerably less (can 0.1wt% be low to moderate), and a small amount of carbonic acid gas and water can be released by after-flame during sintering, do not have other to pollute nuisance, meet low-carbon environment-friendly policy.
Accompanying drawing explanation
Fig. 1 is the surface picture figure of embodiment 3 finished product, wherein Fig. 1 (a) be finished product upper surface photo figure, lower surface photo figure that Fig. 1 (b) is finished product.
Fig. 2 is the micro-structure diagram (scanning electronic microscope) of embodiment 3 finished product section, and wherein Fig. 2 (a) is the scanning electron microscope diagram of 50 times, and Fig. 2 (b) is the scanning electron microscope diagram of 200 times.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
Raw materials used in following examples: flyash is thin ash, crosses 100 mesh sieves; Be taken from fuel-burning power plant, Hefei, main component is Al
2o
3and SiO
2; The main component of glass powder is SiO
2and CaO, the concrete glass discarded that adopts, through ball milling 24h, crosses 100 mesh sieves; Agar powder (purifying, biochemical reagents) is Chemical Reagent Co., Ltd., Sinopharm Group's production; Sodium hexametaphosphate 99 (PAAS), sodium lauryl sulphate (K12), Sodium dodecylbenzene sulfonate (SDBS) are Chemical Reagent Co., Ltd., Sinopharm Group and produce; The molecular weight MW of the sodium polyacrylate (SHMP) of high molecular is 500 ~ 8,000,000, is purchased from Aladdin reagent (China) company limited.
Embodiment 1
Feed composition weight percent is: flyash 35wt%, agar powder 0.3wt%, suds-stabilizing agent Sodium hexametaphosphate 99 (PAAS) 0.15wt%, dispersion agent sodium polyacrylate (SHMP) 0.1wt%, whipping agent sodium lauryl sulphate (K12) 0.4wt%, water 64.05wt%.
The concrete operation step preparing heat insulating porous ceramics is as follows:
(1) by above-mentioned raw materials proportioning, 57.47g flyash, 0.16gPAAS, 0.25g SHMP and 72.53g water are added ball mill, drum's speed of rotation 180 r/min, Ball-milling Time 24 h, obtain elementary slurry; (2) 0.38g agar powder is joined in 25g water, dissolve under temperature 90 DEG C of conditions and obtain the agar water-sol; Get elementary slurry 95g, by elementary slurry in temperature 60 C Water Under bath preheating, add the agar water-sol, under low speed 400 rpm condition, agitator stirs and makes it abundant mixing in about about two minutes, obtains the uniform and stable ceramic size that solid content is 35wt%; (3) in ceramic size, add the whipping agent K12 of ceramic size 0.4wt%, at a high speed under 1800 rpm conditions, agitator stirs and fully foams for about 5 minutes, and slurry will produce a large amount of foam, and volume is about 3 times of original slurry material, obtains foamed slurry.(4) foamed slurry is poured into (mould lower surface and surrounding scribble a small amount of silicone oil) in silica gel mould, under room temperature, gel solidification 24 h, obtains base substrate.(5) after billet surface moisture evaporate to dryness, carry out the demoulding, to move back after mould natural air drying 24 h under room temperature again, obtain porous ceramics green compact.(6) with the temperature rise rate of 2 DEG C/min, green compact are heated to 500 DEG C, at 500 DEG C, are incubated 1h, continued to be heated to 1000 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
The porosity of gained porous ceramics is 90.64%, and density is 0.2561 g/cm
3, thermal conductivity is 0.0546 W/ (mK), and ultimate compression strength is 0.56MPa.
Embodiment 2
Feed composition weight percent is: flyash 40wt%, agar powder 0.3wt%, suds-stabilizing agent Sodium hexametaphosphate 99 (PAAS) 0.15wt%, dispersion agent sodium polyacrylate (SHMP) 0.1wt%, whipping agent sodium lauryl sulphate (K12) 0.4wt%, water 59.05wt%.
The concrete operation step preparing heat insulating porous ceramics is as follows:
By 67.20g flyash, 0.17gPAAS, 0.25gSHMP and 72.80g water adds ball mill, and drum's speed of rotation 180 r/min, Ball-milling Time 24 h, obtain elementary slurry; (2) 0.38g agar powder is added in 20g water, dissolve under temperature 90 DEG C of conditions and obtain the agar water-sol; Get elementary slurry 100g, by elementary slurry in temperature 60 C Water Under bath preheating, add the agar water-sol, under low speed 400 rpm condition, agitator stirs and makes it abundant mixing in about about two minutes, obtains the uniform and stable ceramic size that solid content is 40wt%; (3) in ceramic size, add the whipping agent K12 of ceramic size 0.4wt%, at a high speed under 1800 rpm conditions, agitator stirs and fully foams for about 5 minutes, and slurry will produce a large amount of foam, and volume is about 2.7 times of original slurry material, obtains foamed slurry.(4) foamed slurry is poured into (mould lower surface and surrounding scribble a small amount of silicone oil) in silica gel mould, under room temperature, gel solidification 24 h, obtains base substrate.(5) after billet surface moisture evaporate to dryness, carry out the demoulding, to move back after mould natural air drying 24 h under room temperature again, obtain porous ceramics green compact.(6) with the temperature rise rate of 2 DEG C/min, green compact are heated to 500 DEG C, at 500 DEG C, are incubated 1h, continued to be heated to 1000 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
The porosity of gained porous ceramics is 88.92%, and density is 0.3035 g/cm
3, thermal conductivity is 0.0630 W/ (mK), and ultimate compression strength is 0.78MPa.
Embodiment 3
Feed composition weight percent is: flyash 35wt%, agar powder 0.2wt%, suds-stabilizing agent Sodium hexametaphosphate 99 (PAAS) 0.15wt%, dispersion agent sodium polyacrylate (SHMP) 0.1wt%, whipping agent sodium lauryl sulphate (K12) 0.4wt%, water 64.15wt%.
The concrete operation step preparing heat insulating porous ceramics is as follows:
By 57.47g flyash, 0.16gPAAS, 0.25gSHMP and 72.53g water adds ball mill, and drum's speed of rotation 180 r/min, Ball-milling Time 24 h, obtain elementary slurry; (2) 0.26g agar powder is added in 25g water, dissolve under temperature 90 DEG C of conditions and obtain the agar water-sol; Get elementary slurry 95g, by elementary slurry in temperature 55 DEG C of Water Under bath preheatings, add the agar water-sol, under low speed 400 rpm condition, agitator stirs and makes it abundant mixing in about about two minutes, obtains the uniform and stable ceramic size that solid content is 35wt%; (3) in ceramic size, add the whipping agent K12 of ceramic size 0.4wt%, at a high speed under 1800 rpm conditions, agitator stirs and fully foams for about 5 minutes, and slurry will produce a large amount of foam, and volume is about 3.1 times of original slurry material, obtains foamed slurry.(4) foamed slurry is poured into (mould lower surface and surrounding scribble a small amount of silicone oil) in silica gel mould, under room temperature, gel solidification 24 h, obtains base substrate.(5) after billet surface moisture evaporate to dryness, carry out the demoulding, to move back after mould natural air drying 24 h under room temperature again, obtain porous ceramics green compact.(6) with the temperature rise rate of 2 DEG C/min, green compact are heated to 500 DEG C, at 500 DEG C, are incubated 1h, continued to be heated to 1000 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
The porosity of gained porous ceramics is 91.1%, and density is 0.2438 g/cm
3, thermal conductivity is 0.0518 W/ (mK), and ultimate compression strength is 0.52MPa.Fig. 1 is the surface picture figure of finished product, wherein Fig. 1 (a) be finished product upper surface photo figure, lower surface photo figure that Fig. 1 (b) is finished product, and known sample surfaces is regular, forming; Fig. 2 is the micro-structure diagram (scanning electronic microscope) of finished product section, and wherein Fig. 2 (a) is the scanning electron microscope diagram of 50 times, and Fig. 2 (b) is the scanning electron microscope diagram of 200 times.Can find out that the porous ceramics of preparation has uniform spherical honeycomb porous structure unit, hole wall is interconnected with hole window.
Embodiment 4
Feed composition weight percent is: flyash 35wt%, agar powder 0.2wt%, suds-stabilizing agent Sodium hexametaphosphate 99 (PAAS) 0.15wt%, dispersion agent sodium polyacrylate (SHMP) 0.1wt%, glass powder 2wt%, whipping agent sodium lauryl sulphate (K12) 0.4wt%, water 62.15wt%.
The concrete operation step preparing heat insulating porous ceramics is as follows:
By 72.53g water, 57.47g flyash, 0.16gPAAS, 0.25gSHMP, 3.30g glass powder and 72.53g water add ball mill, and drum's speed of rotation 180 r/min, Ball-milling Time 24 h, obtain elementary slurry; (2) 0.26g agar powder is added in 25g water, dissolve under temperature 90 DEG C of conditions and obtain the agar water-sol; Get elementary slurry 95g, by elementary slurry in temperature 55 DEG C of Water Under bath preheatings, add the agar water-sol, under low speed 400 rpm condition, agitator stirs and makes it abundant mixing in about about two minutes, obtains the uniform and stable ceramic size that solid content is 37wt%; (3) in ceramic size, add the whipping agent K12 of ceramic size 0.4wt%, at a high speed under 1800 rpm conditions, agitator stirs and fully foams for about 5 minutes, and slurry will produce a large amount of foam, and volume is about 3 times of original slurry material, obtains foamed slurry.(4) foamed slurry is poured into (mould lower surface and surrounding scribble a small amount of silicone oil) in silica gel mould, under room temperature, gel solidification 24 h, obtains base substrate.(5) after billet surface moisture evaporate to dryness, carry out the demoulding, to move back after mould natural air drying 24 h under room temperature again, obtain porous ceramics green compact.(6) with the temperature rise rate of 2 DEG C/min, green compact are heated to 500 DEG C, at 500 DEG C, are incubated 1h, continued to be heated to 1000 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
The porosity of gained porous ceramics is 90.35%, and density is 0.2589 g/cm
3, thermal conductivity is 0.0581 W/ (mK), and ultimate compression strength is 0.70MPa.
Embodiment 5
Feed composition weight percent is: flyash 35wt%, agar powder 0.2wt%, suds-stabilizing agent Sodium hexametaphosphate 99 (PAAS) 0.15wt%, dispersion agent sodium polyacrylate (SHMP) 0.1wt%, glass powder 2wt%, whipping agent Sodium dodecylbenzene sulfonate (SDBS) 0.5wt%, water 62.05wt%.
The concrete operation step preparing heat insulating porous ceramics is as follows:
57.47g flyash, 0.16gPAAS, 0.25gSHMP, 3.30g glass powder and 72.53g water are added ball mill, and drum's speed of rotation 180 r/min, Ball-milling Time 24 h, obtain elementary slurry; (2) 0.26g agar powder is added in 25g water, dissolve under temperature 90 DEG C of conditions and obtain the agar water-sol; Get elementary slurry 95g, by elementary slurry in temperature 55 DEG C of Water Under bath preheatings, add the agar water-sol, under low speed 400 rpm condition, agitator stirs and makes it abundant mixing in about about two minutes, obtains the uniform and stable ceramic size that solid content is 37wt%; (3) in ceramic size, add the whipping agent SDBS of ceramic size 0.5wt%, at a high speed under 1800 rpm conditions, agitator stirs and fully foams for about 5 minutes, and slurry will produce a large amount of foam, and volume is about 3 times of original slurry material, obtains foamed slurry.(4) foamed slurry is poured into (mould lower surface and surrounding scribble a small amount of silicone oil) in Teflon mould, under room temperature, gel solidification 24 h, obtains base substrate.(5) after billet surface moisture evaporate to dryness, carry out the demoulding, to move back after mould natural air drying 24 h under room temperature again, obtain porous ceramics green compact.(6) with the temperature rise rate of 2 DEG C/min, green compact are heated to 500 DEG C, at 500 DEG C, are incubated 1h, continued to be heated to 1000 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
The porosity of gained porous ceramics is 90.14%, and density is 0.2605 g/cm
3, thermal conductivity is 0.0592 W/ (mK), and ultimate compression strength is 0.72MPa.
Embodiment 6
Feed composition weight percent is: flyash 35wt%, agar powder 0.2wt%, suds-stabilizing agent Sodium hexametaphosphate 99 (PAAS) 0.15wt%, dispersion agent sodium polyacrylate (SHMP) 0.1wt%, glass powder 2wt%, whipping agent sodium lauryl sulphate (K12) 0.4wt%, water 62.15wt%.
The concrete operation step preparing heat insulating porous ceramics is as follows:
57.47g flyash, 0.16gPAAS, 0.25gSHMP, 3.30g glass powder and 72.53g water are added ball mill, and drum's speed of rotation 180 r/min, Ball-milling Time 24 h, obtain elementary slurry; (2) 0.26g agar powder is added in 25g water, dissolve under temperature 90 DEG C of conditions and obtain the agar water-sol; Get elementary slurry 95g, by elementary slurry in temperature 55 DEG C of Water Under bath preheatings, add the agar water-sol, under low speed 400 rpm condition, agitator stirs and makes it abundant mixing in about about two minutes, obtains the uniform and stable ceramic size that solid content is 37wt%; (3) in ceramic size, add the whipping agent K12 of ceramic size 0.4wt%, at a high speed under 1800 rpm conditions, agitator stirs and fully foams for about 5 minutes, and slurry will produce a large amount of foam, and volume is about 3 times of original slurry material, obtains foamed slurry.(4) foamed slurry is poured into (mould lower surface and surrounding scribble a small amount of silicone oil) in silica gel mould, under room temperature, gel solidification 24 h, obtains base substrate.(5) after billet surface moisture evaporate to dryness, carry out the demoulding, to move back after mould natural air drying 24 h under room temperature again, obtain porous ceramics green compact.(6) with the temperature rise rate of 2 DEG C/min, green compact are heated to 500 DEG C, at 500 DEG C, are incubated 1h, continued to be heated to 1100 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
The porosity of gained porous ceramics is 89.03%, and density is 0.2686 g/cm
3, thermal conductivity is 0.0593 W/ (mK), and ultimate compression strength is 0.81MPa.
Claims (6)
1. the preparation method of a light flyash heat insulating porous ceramics, it is characterized in that: comprise the raw material powder coal ash 30 ~ 40wt% of following mass percent, agar powder 0.1 ~ 0.5wt%, suds-stabilizing agent 0.15 ~ 0.2wt%, dispersion agent 0.1 ~ 0.15wt%, glass powder 0 ~ 4wt%, whipping agent 0.3 ~ 0.5wt% and water 54.65 ~ 64.75wt%;
Described suds-stabilizing agent is Sodium hexametaphosphate 99, and described dispersion agent is sodium polyacrylate, and described whipping agent is sodium lauryl sulphate or Sodium dodecylbenzene sulfonate;
Concrete preparation manipulation step is as follows:
(1) elementary slurry is prepared, by flyash, glass powder, dispersion agent, suds-stabilizing agent and water, mixing and ball milling, rotational speed of ball-mill 170 ~ 180r/min, Ball-milling Time 20 ~ 24h, obtain elementary slurry;
(2) preparation is containing agar slurry, by elementary slurry in temperature 55 ~ 60 DEG C of Water Under bath preheatings, 25.14g ~ 25.62g agar water-sol is joined in 95g slurry, the concentration of the described agar water-sol is 0.56 ~ 2.42wt%, be uniformly mixed, obtain the uniform and stable ceramic size that solid content is 35wt%;
(3) foam, in ceramic size, add the tensio-active agent of ceramic size 0.3 ~ 0.5wt%, violent stirring produces a large amount of foam, and intensively stirred rotating speed is 1700 ~ 2000r/min, and churning time 4 ~ 6min, obtains foamed slurry;
(4) gel solidification, pours into foamed slurry in mould, and under room temperature, gel solidification 20 ~ 24h, obtains base substrate;
(5) demoulding is dry, and treat billet surface moisture evaporate to dryness, the demoulding, under room temperature, natural air drying 20 ~ 24h, obtains porous ceramics green compact;
(6) sinter, with the temperature rise rate of 2 DEG C/min, porous ceramics green compact are heated to 500 DEG C, insulation 1h, continued to be heated to 900 ~ 1100 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics;
The porosity of described porous ceramics is 88 ~ 91%, and density is 0.24 ~ 0.31g/cm
3, thermal conductivity is 0.051 ~ 0.072W/ (mK), and ultimate compression strength is 0.4 ~ 1.0Mpa.
2. the preparation method of a kind of light flyash heat insulating porous ceramics according to claim 1, is characterized in that: described flyash crosses 100 mesh sieves, and described glass powder is by scrap glass ball milling 24h, crosses 100 mesh sieves.
3. the preparation method of a kind of light flyash heat insulating porous ceramics according to claim 1, is characterized in that: the molecular weight MW of described sodium polyacrylate is 500 ~ 8,000,000.
4. the preparation method of a kind of light flyash heat insulating porous ceramics according to claim 1, is characterized in that: step (1) described ball milling, and the ratio of powder and abrading-ball is 1:3 ~ 1:4; Simultaneously for ensureing that powder has sufficient mixing space, the add-on of powder should account for 1/3 ~ 1/5 of ball grinder capacity.
5. the preparation method of a kind of light flyash heat insulating porous ceramics according to claim 1, it is characterized in that: 0.14 ~ 0.62g agar powder is joined in 20 ~ 25g water and dissolves, at temperature 90 ~ 95 DEG C, stirring and dissolving is even, obtains the agar water-sol of 0.56 ~ 2.42wt%.
6. the preparation method of a kind of light flyash heat insulating porous ceramics according to claim 1, is characterized in that: in step (5), the material of mould therefor is silica gel or tetrafluoroethylene.
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| CN109293350A (en) * | 2018-09-20 | 2019-02-01 | 中国科学院上海硅酸盐研究所 | A kind of low dielectric porous mullite electromagnetic wave transparent material and preparation method thereof |
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