CN102976710A - Nano miroporous heat-insulating material - Google Patents
Nano miroporous heat-insulating material Download PDFInfo
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- CN102976710A CN102976710A CN2012104785191A CN201210478519A CN102976710A CN 102976710 A CN102976710 A CN 102976710A CN 2012104785191 A CN2012104785191 A CN 2012104785191A CN 201210478519 A CN201210478519 A CN 201210478519A CN 102976710 A CN102976710 A CN 102976710A
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Abstract
The invention relates to a heat-insulating material in a nano miroporous structure. A method for preparing the heat-insulating material comprises the following steps of: (1) stirring and mixing raw materials including nanoscale silica, an infrared opacifier, reinforced fibers and a refractory material to obtain a mixture; and (2) enabling the mixture obtained in the step (1) to be subjected to dry pressing, and sintering at 800 DEG C for at least 1 hour to obtain a target object. The nanoscale silica accounts for 40-80% of the total weight of the raw materials, the infrared opacifier accounts for 10-30%, the reinforced fibers account for 5-15%, and the refractory material accounts for 5-15%. The heat-insulating material provided by the invention has good excellent heat insulating properties and mechanical strength and can be used for a long time at a high temperature.
Description
Technical field
The present invention relates to a kind of lagging material of nanometer micropore structure.
Background technology
High performance lagging material has great importance for energy-saving and cost-reducing.The nanometer micropore lagging material has been owing to its distinctive microstructure has possessed very excellent heat-insulating property, its thermal conductivity even can be lower than the thermal conductivity of vacuum.Iron And Steel Industry is high energy consumption industry, if blast furnace lining uses high performance lagging material, will effectively improve energy utilization rate.But the blast furnace lining lagging material also should possess the stability of life-time service under certain physical strength and the high temperature (800～1000 ℃) except must possessing ultralow thermal conductivity.
USP.6,818,273 disclose a kind of lagging material constituent with microvoid structure, it comprises 30～90% fine metal-oxide powders, and in surface coverage help to improve the mica layer of thermal resistance.But the use temperature of this lagging material only is 620 ℃.
USP.6,936,326 disclosed lagging material constituents comprise 30-90% fine metal oxide powder, 0-30% infrared light screening agent, 0-10% ceramic fiber, 0-15% inorganic adhesive.The inorganic adhesive that adopts is water glass, aluminum phosphate or various boride, and its main purpose is for improving intensity and prevent that constituent from having a rebound after dry-pressing formed.Also comprise the hard Calucium Silicate powder of 5-15% in the constituent, and thought if added the hard Calucium Silicate powder of 5-15%, can not use inorganic adhesive.But no matter be to have comprised inorganic adhesive, or hard Calucium Silicate powder all will affect the high-temperature stability of lagging material in the constituent.
USP.6,921,506 lagging material constituents comprise the 10-100% fine silica powder; The 0.5-6% carbon dust; The 0-40% infrared light screening agent; 0-50% inorganic light weight filler, such as aerosil, perlite, swelling clay, glass microballon etc.Although the inorganic light weight filler helps to improve the void content of lagging material, improve intensity and heat-insulating property, some raw material wherein, such as pearlstone, glass microballon etc. will be unfavorable for the high-temperature stability of material.Also introduced the 2-10% inorganic fibre in the constituent, such as E-glass, S-glass, R-glass, ECR-glass, C-glass, A-glass or other ceramic fiber, these glass fibre are unfavorable for the lagging material high-temperature behavior equally.
The disclosed lagging material constituent of CN 102659437A with useless powder as infrared light screening agent, compound with nano silicon, inorganic reinforcing fiber, its thermal conductivity is 0.037W/mk (800 ℃), but insulation in 900 ℃/12 hours, the linear shrinkage of sample reaches about 2%.
Summary of the invention
The object of the invention is to, a kind of nanometer micropore lagging material of novelty is provided, overcome the defective that exists in the prior art.
Nanometer micropore lagging material of the present invention is characterized in that, described nanometer micropore lagging material is made by the preparation method who comprises the following steps:
(1) will comprise the raw material stirring mixing such as nanometer grade silica, infrared light screening agent, fortifying fibre and refractory substance, obtain mixture:
(2) will be dry-pressing formed by the mixture of step (1) gained (to the shape and the thickness that need), and under 800 ℃ of conditions sintering at least 1 hour, obtain target compound (heat insulating porous material of the present invention);
Wherein, take raw materials used gross weight as 100%, nanometer grade silica accounts for 40wt%～80wt%, and infrared light screening agent accounts for 10wt%～30wt%, and fortifying fibre accounts for 5wt%～15wt%, and refractory body accounts for 5wt%～15wt%:
Described infrared light screening agent is can absorb or the extraradial material of Disperse Red, and described fortifying fibre is refractory ceramic fibre, and described refractory body is the pyroceramic powder body material.
The thermal conductivity of described heat insulating porous material is 0.030W/mk～0.032W/mk (800 ℃), and compressive strength is 320KPa～600KPa, insulation in 1000 ℃/12 hours, and the linear shrinkage of described heat insulating porous material is less than 0.5%.
Constituent of the present invention adopts nanometer grade silica to consist of the distinctive microstructure of lagging material, makes it possess the sealed porosity of nano-scale; Adopt infrared light screening agent to reduce the radiative transfer of lagging material, reduce the thermal conductivity under the high temperature; Adopt fortifying fibre to improve the physical strength of lagging material; Particularly introduced refractory substance, made product not only have good heat-insulating property and physical strength, and life-time service at high temperature.
Embodiment
In preferred technical scheme of the present invention, used nanometer grade silica accounts for raw materials used gross weight 50wt%～75wt%.
In another preferred technical scheme of the present invention, used infrared light screening agent is the ceramic powder with high radiance;
The infrared light screening agent of recommendation of the present invention is selected from: in zirconium silicate, titanium oxide, silicon carbide or six potassium titanates one or more.
In a further preferred technical solution of the present invention, the refractory substance that the present invention adopts is the high-temperature structural ceramics powder;
The refractory substance of recommendation of the present invention is selected from: aluminum oxide, zirconium white, chromic oxide, silicon nitride or or aluminium nitride in one or more.
If lacked refractory substance in the heat insulating porous material, although it is still keeping excellent heat-insulating property, but life-time service under 800 ℃～1000 ℃ high temperature, because high-temperature shrinkage will pieced together generation slit, knot place inevitably, the heat-insulating property of thermal insulation layer integral body is reduced, so, add 5wt%～15wt% refractory substance, help to improve the thermostability of lagging material.
In another optimal technical scheme of the present invention, used fortifying fibre is selected in the high refractoriness ceramic fiber one or more, and such as (but being not limited to): used fortifying fibre is selected from one or more in zirconic acid aluminum fiber, sapphire whisker or the Zirconium oxide fibre.
In heat insulating porous material provided by the present invention, do not contain inorganic adhesive or hard Calucium Silicate powder, because these additives will impair the high temperature properties of lagging material.The physical strength of lagging material can be improved by the adjustment of other component in the composition, and the bounce-back that produces easily in the moulding process also can be controlled by manufacture method and device.
The present invention is further elaborated by the following examples, and its purpose only is better to understand content of the present invention.Therefore, the cited case does not limit protection scope of the present invention.
Embodiment 1
Nano silicon with 55wt%, 10wt% six potassium titanates and 10wt% zirconium silicate, the 10wt% zirconium white, and 15wt%% zirconic acid aluminum fiber, evenly mix in homogenizer, dry-pressing formed is the sheet material of 400mm (length) * 200mm (wide) * 25mm (thick), at last 800 ℃ of lower sintering 1 hour, furnace cooling obtains nanometer micropore lagging material A.
The volume density 250Kg/m of nanometer micropore lagging material A
3, thermal conductivity 0.023W/mk (400 ℃), 0.030W/mk (800 ℃), compressive strength 320KPa, insulation in 1000 ℃/12 hours, the linear shrinkage of nanometer micropore lagging material A is less than 0.5%.
Embodiment 2
Nano silicon with 60wt%, the 15wt% zirconium silicate, the 10wt% aluminum oxide, 10wt% sapphire whisker and 5wt% zirconic acid aluminum fiber, evenly mix in homogenizer, dry-pressing formed is the sheet material of 400mm (length) * 200mm (wide) * 25mm (thick), at last 800 ℃ of lower sintering 1 hour, furnace cooling obtains nanometer micropore lagging material B.
The volume density 280Kg/m of nanometer micropore lagging material B
3, thermal conductivity 0.025W/mk (400 ℃), 0.032W/mk (800 ℃), compressive strength 600KPa, insulation in 1000 ℃/12 hours, the linear shrinkage of nanometer micropore lagging material B is less than 0.5%.
Claims (5)
1. a nanometer micropore lagging material is characterized in that, described nanometer micropore lagging material is made by the preparation method who comprises the following steps:
(1) will comprise the raw material stirring mixing such as nanometer grade silica, infrared light screening agent, fortifying fibre and refractory substance, obtain mixture;
(2) will be dry-pressing formed by the mixture of step (1) gained, and under 800 ℃ of conditions sintering at least 1 hour, obtain target compound;
Wherein, take raw materials used gross weight as 100%, nanometer grade silica accounts for 40wt%～80wt%, and infrared light screening agent accounts for 10wt%～30wt%, and fortifying fibre accounts for 5wt%～15wt%, and refractory body accounts for 5wt%～15wt%;
Described infrared light screening agent is the ceramic powder with high radiance, and described fortifying fibre is refractory ceramic fibre, and described refractory body is the high-temperature structural ceramics powder;
The thermal conductivity of described nanometer micropore lagging material is 0.030W/mk～0.032W/mk (800 ℃), and compressive strength is 320KPa～600KPa, insulation in 1000 ℃/12 hours, and the linear shrinkage of described heat insulating porous material is less than 0.5%.
2. heat insulating porous material as claimed in claim 1 is characterized in that, wherein nanometer grade silica accounts for raw materials used gross weight 50wt%～75wt%.
3. heat insulating porous material as claimed in claim 1 or 2 is characterized in that, wherein used infrared light screening agent is selected from: in zirconium silicate, titanium oxide, silicon carbide or six potassium titanates one or more.
4. heat insulating porous material as claimed in claim 1 or 2 is characterized in that, wherein used refractory substance is selected from: one or more in aluminum oxide, zirconium white, chromic oxide, silicon nitride or the aluminium nitride.
5. heat insulating porous material as claimed in claim 1 or 2 is characterized in that, wherein used fortifying fibre is selected from: one or more in zirconic acid aluminum fiber, sapphire whisker or the Zirconium oxide fibre.
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| CN2012104785191A CN102976710A (en) | 2012-11-22 | 2012-11-22 | Nano miroporous heat-insulating material |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103557737A (en) * | 2013-09-22 | 2014-02-05 | 东莞市丹佛斯节能科技有限公司 | Heat preserving device for telescope-feed heat exchanger |
| CN104311096A (en) * | 2014-09-25 | 2015-01-28 | 深圳国能合创能源技术有限公司 | Nano-pore thermal insulation material and preparation method thereof |
| CN105036785A (en) * | 2015-07-13 | 2015-11-11 | 上海柯瑞冶金炉料有限公司 | Composition and manufacturing method for high-temperature type non-burning nanometer microporous heat-insulating material |
| CN105307796A (en) * | 2013-06-17 | 2016-02-03 | Ask化学品股份有限公司 | Lithium-containing molding material mixture based on an inorganic binder for producing molds and cores for metal casting |
| CN105645998A (en) * | 2016-01-12 | 2016-06-08 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of low-heat-conductivity silicon nitride heat-insulating material |
| CN106116441A (en) * | 2016-06-17 | 2016-11-16 | 无锡英普林纳米科技有限公司 | A kind of micropore heat-barrier material using nanometer embossing to prepare and preparation method |
| CN107188599A (en) * | 2017-06-27 | 2017-09-22 | 苏州楚博生物技术有限公司 | A kind of high-strength thermal insulation ceramic powder |
| CN107879761A (en) * | 2017-12-08 | 2018-04-06 | 中国矿业大学 | A kind of stacking bed super insulating material of nanometer silicon dioxide particle and preparation method thereof |
| CN108395200A (en) * | 2018-03-30 | 2018-08-14 | 江苏阿路美格新材料股份有限公司 | Fire-resistant composite panel core material and preparation method thereof |
| CN109095937A (en) * | 2018-09-05 | 2018-12-28 | 江苏中磊节能科技发展有限公司 | The fiber reinforced low thermally conductive long-life complex phase fireclay insulating refractory of one kind and preparation method |
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2012
- 2012-11-22 CN CN2012104785191A patent/CN102976710A/en active Pending
Non-Patent Citations (1)
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| 徐庭: "SiO2纳米微孔绝热材料的制备和性能研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105307796B (en) * | 2013-06-17 | 2017-07-04 | Ask化学品股份有限公司 | For manufacturing the mould of metal casting and the molding material blends containing lithium based on inorganic bond of core |
| CN105307796A (en) * | 2013-06-17 | 2016-02-03 | Ask化学品股份有限公司 | Lithium-containing molding material mixture based on an inorganic binder for producing molds and cores for metal casting |
| CN103557737B (en) * | 2013-09-22 | 2016-07-20 | 广东龙正节能环保科技有限公司 | A kind of attemperator for sleeve type heat exchanger |
| CN103557737A (en) * | 2013-09-22 | 2014-02-05 | 东莞市丹佛斯节能科技有限公司 | Heat preserving device for telescope-feed heat exchanger |
| CN104311096A (en) * | 2014-09-25 | 2015-01-28 | 深圳国能合创能源技术有限公司 | Nano-pore thermal insulation material and preparation method thereof |
| CN105036785A (en) * | 2015-07-13 | 2015-11-11 | 上海柯瑞冶金炉料有限公司 | Composition and manufacturing method for high-temperature type non-burning nanometer microporous heat-insulating material |
| CN105645998A (en) * | 2016-01-12 | 2016-06-08 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of low-heat-conductivity silicon nitride heat-insulating material |
| CN106116441A (en) * | 2016-06-17 | 2016-11-16 | 无锡英普林纳米科技有限公司 | A kind of micropore heat-barrier material using nanometer embossing to prepare and preparation method |
| CN107188599A (en) * | 2017-06-27 | 2017-09-22 | 苏州楚博生物技术有限公司 | A kind of high-strength thermal insulation ceramic powder |
| CN107879761A (en) * | 2017-12-08 | 2018-04-06 | 中国矿业大学 | A kind of stacking bed super insulating material of nanometer silicon dioxide particle and preparation method thereof |
| CN107879761B (en) * | 2017-12-08 | 2020-01-07 | 中国矿业大学 | Nano silicon dioxide particle packed bed super heat-insulating material and preparation method thereof |
| CN108395200A (en) * | 2018-03-30 | 2018-08-14 | 江苏阿路美格新材料股份有限公司 | Fire-resistant composite panel core material and preparation method thereof |
| CN109095937A (en) * | 2018-09-05 | 2018-12-28 | 江苏中磊节能科技发展有限公司 | The fiber reinforced low thermally conductive long-life complex phase fireclay insulating refractory of one kind and preparation method |
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Application publication date: 20130320 |