CN1197826C - Refractory heat-insulating material for microwave oven - Google Patents
Refractory heat-insulating material for microwave oven Download PDFInfo
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- CN1197826C CN1197826C CNB021588031A CN02158803A CN1197826C CN 1197826 C CN1197826 C CN 1197826C CN B021588031 A CNB021588031 A CN B021588031A CN 02158803 A CN02158803 A CN 02158803A CN 1197826 C CN1197826 C CN 1197826C
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- mullite
- heating layer
- inorganic
- thermal insulating
- microwave
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/74—Ceramic products containing macroscopic reinforcing agents containing shaped metallic materials
- C04B35/76—Fibres, filaments, whiskers, platelets, or the like
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0003—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability making use of electric or wave energy or particle radiation
- C04B40/001—Electromagnetic waves
- C04B40/0014—Microwaves
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
- C04B2235/522—Oxidic
- C04B2235/5228—Silica and alumina, including aluminosilicates, e.g. mullite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Furnace Details (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
A fireproof adiabatic material for microwave sintering furnace which aroses the sintered material self-heating by microwave radiation. Heating layers are located on the based material which contains inorganic fiber materials as main component, and the main component of the heating layers is mullite. Besides mullite, the heating layers also contain the material having more excellent microwave absorption properties than the mullite. The heating layers contain inorganic combination material, which forms film continuously covering the mullite or the mullite and the material having more excellent microwave absorption properties than the mullite.
Description
Technical field
The present invention relates to a kind of refractory thermal insulating material and coating material, it is suitable as and is used for that microwave irradiation causes that quilts such as stupalith or fine ceramics material are fired the thing self-heating and the furnace wall material fired.
Technical background
In the past, generally electric furnace or steam stove etc. is used to fire and is fired thing.But, this by situation about firing from indirect heating under, become big, the temperature in the essential slowly rising stove in order not make the surface of being fired thing and the inner temperature difference.Therefore there is elongated problem of firing time.
Therefore, in order to solve this class problem, proposed to fire and fired thing (for example the spy opens flat 6-87663 number etc.) with microwave.Firing time of this method shortens, controlled etc. good to atmosphere, but also reduced the pollution to environment, attracted attention as the method for cooking in future.
When microwave is fired, absorbed, fired thing oneself and generate heat, so fired the surface of thing and the temperature difference between the inside diminishes because microwave fires thing.Therefore, when can shortening the firing time, can also fire equably and be fired thing.
In addition, what microwave caused is fired in the firing that the thing self-heating caused, by being fired the thing encirclement with having with the refractory thermal insulating material of being fired the identical microwave absorbing characteristic of thing, the appearance of the thermograde that the radiation cooling of thing caused is fired in inhibition, can further evenly fire being fired thing.
However, with having when the refractory thermal insulating material encirclement of being fired the identical microwave absorbing characteristic of thing is fired thing and fired the also besieged refractory thermal insulating material consumption of being fired thing of the energy of microwave.Therefore, firing essential energy increases.
In addition, if reduce microwave energy that refractory thermal insulating material consumed and with the thickness attenuation of refractory thermal insulating material, then can't ignore because the heat energy from the refractory thermal insulating material loss that is caused is cooled off in radiation, the result produces the problem that occurs thermograde between thing and the refractory thermal insulating material of being fired.
Above-mentioned microwave is fired method, is evenly fired the aspect that reduces with microwave energy from what fire thing, has all reached quite high level.
However, more fired thing, undoubtedly need seek to be suitable for above-mentioned microwave and fire the more high performance refractory thermal insulating material of having of method in order can enough limited microwave energies to fire.Promptly, 1. and to be fired thing same owing to absorb microwave and cause heating but have and make the radiation cooling caused and fired the littler good heat insulating ability of thermograde between the thing refractory thermal insulating material requires to have following characteristic: even, 2. microwave absorbing as a whole still less, 3. heat up at short notice and the refrigerative environment for use under, have good anti-spallation.
Summary of the invention
The purpose of this invention is to provide a kind of high performance refractory thermal insulating material and coating material, it is applicable to and causes self-heating and make as microwave irradiation and fired the furnace wall material that thing is fired.
Illustration optimal way of the present invention is as follows.
(1) be used for microwave irradiation and cause the microwave baking furnace refractory thermal insulating material of being fired the thing self-heating, firing, it is characterized in that, be provided with heating layer on the single face of base material, base material is a principal constituent with the inorganic fibre material, and heating layer is principal constituent with the mullite.
(2) aforementioned refractory thermal insulating material is characterized in that, heating layer not only contains mullite, also contains the material with microwave absorbing characteristic also bigger than mullite.
(3) aforementioned refractory thermal insulating material, it is characterized in that, heating layer contains mullite and inorganic bond material, perhaps, heating layer contains mullite, has the material and the inorganic bond material of the microwave absorbing characteristic also bigger than mullite, and this inorganic bond material only covers mullite continuously and forms material membranaceous or that cover mullite continuously and have a microwave absorbing characteristic also bigger than mullite and form membranaceous.
(4) aforementioned refractory thermal insulating material is characterized in that, the material with microwave absorbing characteristic also bigger than mullite is a material of adjusting the thermal value of heating layer.
(5) aforementioned refractory thermal insulating material is characterized in that, heating layer contains inorganic fibre.
(6) aforementioned refractory thermal insulating material is characterised in that, inorganic fibre is a mullite fiber.
(7) aforementioned refractory thermal insulating material is characterised in that, heating layer is designed to join with the single face of base material.
(8) be used to constitute the coating material of heating layer, it is characterized in that, in mullite class cement (cement), add material that ferric oxide, magnesium oxide, zirconium white and silicon carbide etc. have a microwave absorbing characteristic also bigger than mullite more than a kind and mullite fiber.
The result that the inventor etc. further investigate is in microwave is fired, to be used to surround the refractory thermal insulating material of being fired thing and to be formed by base material and heating layer.In this specification sheets, fire and comprise sintering.
At first, heating layer is described.Preferably be that principal constituent forms heating layer with the mullite.During irradiating microwaves,, can think that heating layer and quilt are fired thing and be suitable for the identical material of use if consider to make the surface temperature of being fired thing and heating layer substantially the same.But, fired under the situation that thing is a stupalith, because stupalith is softening about 1000 ℃, contraction, so heating layer can not use and fired the identical stupalith of thing.On the other hand because mullite not only the temperature range more than the firing temperature of stupalith have thermotolerance, and have and the immediate microwave absorbing characteristic of stupalith, so be preferably used as constituent into heating layer.
In addition, as the constituent of heating layer, preferably have the microwave absorbing characteristic also big material also bigger than mullite.If be used for surrounding described ceramic equipment as the immediate mullite heating layer of the microwave absorbing characteristic of the ceramic equipment of being fired thing, irradiating microwaves, the aforementioned surface temperature of being fired thing and heating layer should be identical.But in fact, because the heat energy that microwave irradiation obtains is compared, being lost to outside heat energy from heating layer can not ignore with heating layer.Therefore, the constituent of heating layer is under the situation of mullite, because owing to the radiation cooling, the temperature of heating layer is descended, and causes being fired between thing and the heating layer thermograde occurring.For above-mentioned reasons, preferably in heating layer,, contain the temperature head that the material with microwave absorbing characteristic also bigger than mullite compensates the heating layer surface and fired thing as the constituent except that mullite.As mentioned above, the material as also bigger than the microwave absorbing of mullite can list ferric oxide, magnesium oxide, zirconium white and silicon carbide etc.
In addition, the inorganic bond material of usefulness of preferred heating layer only covers mullite continuously and forms material membranaceous or that cover mullite continuously and have the microwave absorbing characteristic also bigger than mullite.
Even the constituent of heating layer is identical, if its structure is different, and thermal value also difference can occur.As the one example, Fig. 1 is that expression is the scanning electron microscope photo of the micro-structure of the micro-structure of the sufficient heating layer of heating and the inadequate heating layer that generates heat, and Fig. 2 is the synoptic diagram of the difference of expression micro-structure.Shown in a of Fig. 1 and Fig. 2,1 one-tenth of the inorganic bond material of the micro-structure of the sufficient heating layer that generates heat is membranaceous to be covered mullite 2 continuously and has than the material (being micro mist 3) that does not come 2 also big microwave absorbing characteristics.
When use had the heating layer of this spline structure, after the microwave with the 2.45GHz frequency began to shine about 100 minutes, heating layer and the temperature of being fired the near surface of thing reached 1300 ℃.
Relative therewith, shown in the b of Fig. 1 and Fig. 2, with regard to the micro-structure of the inadequate heating layer that generates heat, the film of inorganic bond material 1 is insufficient, and mullite 2 due to the inorganic bond material and the combination with material (being micro mist 3) of the microwave absorbing characteristic also bigger than mullite are the part combinations.Use under the situation of this heating layer, heating layer and the temperature of being fired the thing near surface only are warmed up to 900 ℃, can not fire as the stupalith of being fired thing.
Above-mentioned result is the example that the heating of expression heating layer depends on the interparticle combination degree that utilizes inorganic bond material film strongly.Shown in this example, if the combination of the particle of formation heating layer and particle is few, between the particle significant discrete state, the heating of heating layer is not enough, can not fire and be fired thing.
In addition, in order to embody the anti-spallation characteristic of heating layer,, preferably contain inorganic fibre as supporting material.When microwave is fired, because heat up at short notice, cool off, so require heat-resisting breaking.Use helps to embody anti-spallation characteristic as the inorganic fibre of supporting material.
The structure of the combination of only membranaceous covering mullite 2 or membranaceous covering mullite 2 and micro mist 3 is containing under the situation of inorganic fibre, and aforesaid inorganic bond material 1 is more important.Its reason is, according to if contain fiber, density descends, and heating efficiency descends, and membranaceous structure can remedy the decline of this heating.
As the inorganic fibre of performance supporting material effect, preference such as alumina silica fibre, sapphire whisker, mullite fiber.Particularly can preferably use mullite fiber.Because the microwave absorbing characteristic of mullite and stupalith is the most approaching, so as the also preferred especially mullite class of the inorganic fibre of supporting material use.
Then, base material is described.
Base material can preferably use the material that can see through microwave, have high heat insulating ability.If microwave absorbed by base material, energy is consumed, and the result fires and fired the necessary energy of thing and significantly increase.In addition, in order to prevent to radiate the heating layer temperature decline that cooling causes, preferred substrates has high heat insulating ability.And preferred substrates has high anti-spallation.
As the base material with These characteristics, can list with the alumina silica fibre is the ceramic beaverboard of principal constituent.Ceramic beaverboard not only can see through microwave, and has good heat insulating ability, resistivity against fire and Gao Nai spallation, can preferably use.
Description of drawings
Fig. 1 (a) is the scanning electron microscope photo of the sufficient heating layer micro-structure of expression heating.
Fig. 1 (b) is the scanning electron microscope photo of the inadequate heating layer micro-structure of expression heating.
Fig. 2 (a) is the synoptic diagram of the sufficient heating layer micro-structure of expression heating.
Fig. 2 (b) is the synoptic diagram of the inadequate heating layer micro-structure of expression heating.
Fig. 3 is the figure of the temperature-raising characteristic of expression one embodiment of the present of invention.
Embodiment
Embodiments of the invention are described, but these embodiment are simple illustration, the invention is not restricted to this.
At first, in mullite class cement, add small amounts iron and mullite fiber, mix, be made into coating material.
Then, this coating material is coated on the ceramic beaverboard (the system FMX-17SR of the モ ノ of Toshiba Off ラ Star Network ス Co., Ltd.) of thick 40mm, reaches thickness 2mm.Then with it 100 ℃ of dryings 3 hours, fired 1 hour at 1000 ℃, make refractory thermal insulating material of the present invention.
Then, with the inboard of this refractory thermal insulating material, make the enclosed space of 300 * 600 * 300mm as heating layer.
Then, as being fired thing, prepare the earthen container of the coffee cup shape of external diameter 85mm, internal diameter 75mm, high 85mm size.This earthen container is placed in the aforesaid enclosed space, with the microwave irradiation of 2.45GHz frequency.
At this moment, the temperature of heating layer and the near surface of being fired thing is identical basically, and the roughly rising pro rata of irradiation time with microwave has temperature-raising characteristic as shown in Figure 1.That is, the heating-up time that is warmed up to 1300 ℃ is about 100 minutes, proves at short notice and can heat up.
The microwave penetrating of irradiation mainly arrives heating layer and, is absorbed heating as the earthen container of being fired thing as the ceramic beaverboard of base material.The ceramic beaverboard that joins with heating layer, reduce that radiation cooling and thermal conduction causes from heating layer in the heat radiation of outside, the heating layer that the temperature decline of the heating layer due to the ferric oxide that exists in the heating layer (microwave absorbing than mullite is also big) compensation radiation cooling and the thermal conduction is produced is surperficial and fired the temperature difference of thing.Therefore, the temperature on earthen container and heating layer surface is identical basically.
The crackle that thermal shocking causes does not take place in the result, at short notice can the roasting earthen container.
Based on the present invention, when can reduce encirclement and fired the microwave energy that refractory thermal insulating material consumed of thing, the surface temperature of being fired thing and heating layer is identical basically, and thing is fired in roasting equably.
Claims (8)
1. one kind is used to utilize microwave irradiation to cause by the microwave baking furnace refractory thermal insulating material of firing the thing self-heating and firing, it is characterized in that, (a) on the single face of base material, be provided with heating layer, (b) base material is principal constituent with the inorganic fibers, (c) heating layer is principal constituent with the mullite, (d) heating layer is except that containing mullite, also contain inorganic bond material, (e) mullite is a particle, (f) develop into film by inorganic bond material, inorganic bond material covers particle continuously with membranaceous, so that particle combination each other becomes big.
2. the described refractory thermal insulating material of claim 1, it is characterized in that, heating layer contains the material with microwave absorbing characteristic bigger than mullite, material with microwave absorbing characteristic bigger than this mullite is a particle, in addition, inorganic bond material is with the membranaceous particle that covers the material with microwave absorbing characteristic bigger than this mullite continuously.
3. the described refractory thermal insulating material of claim 2 is characterized in that, it is less micro mist that the particle with material of the microwave absorbing characteristic bigger than mullite is compared with the particle of mullite.
4. claim 2 or 3 described refractory thermal insulating materials is characterized in that, the material with microwave absorbing characteristic bigger than mullite is a material of adjusting the thermal value of heating layer.
5. the described refractory thermal insulating material of each of claim 1～3 is characterized in that heating layer contains inorganic fibre, and inorganic in addition bond material is with the membranaceous inorganic fibre that covers this heating layer continuously.
6. the described refractory thermal insulating material of claim 4 is characterized in that heating layer contains inorganic fibre, and inorganic in addition bond material is with the membranaceous inorganic fibre that covers this heating layer continuously.
7. the described refractory thermal insulating material of claim 5 is characterized in that, inorganic fibre is a mullite fiber.
8. the described refractory thermal insulating material of claim 6 is characterized in that, inorganic fibre is a mullite fiber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002035290A JP3774410B2 (en) | 2002-02-13 | 2002-02-13 | Refractory insulation for microwave firing furnaces |
| JP035290/2002 | 2002-02-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1445197A CN1445197A (en) | 2003-10-01 |
| CN1197826C true CN1197826C (en) | 2005-04-20 |
Family
ID=27777514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021588031A Expired - Fee Related CN1197826C (en) | 2002-02-13 | 2002-12-25 | Refractory heat-insulating material for microwave oven |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3774410B2 (en) |
| KR (1) | KR100566306B1 (en) |
| CN (1) | CN1197826C (en) |
| TW (1) | TWI229062B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005154169A (en) * | 2003-11-21 | 2005-06-16 | Saint-Gobain Tm Kk | Heating element for microwave kiln |
| JP2005255474A (en) * | 2004-03-12 | 2005-09-22 | Saint-Gobain Tm Kk | Heating element for microwave firing furnace |
| KR100643344B1 (en) * | 2005-03-09 | 2006-11-10 | 한국지질자원연구원 | Lightweight Insulating Materials for Fireproof Use and manufacturing for it |
| CN102288036A (en) * | 2011-06-22 | 2011-12-21 | 湖南阳东磁性材料有限公司 | Microwave furnace and furnace lining thereof |
-
2002
- 2002-02-13 JP JP2002035290A patent/JP3774410B2/en not_active Expired - Fee Related
- 2002-12-25 CN CNB021588031A patent/CN1197826C/en not_active Expired - Fee Related
- 2002-12-27 KR KR1020020085173A patent/KR100566306B1/en not_active IP Right Cessation
- 2002-12-31 TW TW091138060A patent/TWI229062B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| TWI229062B (en) | 2005-03-11 |
| JP3774410B2 (en) | 2006-05-17 |
| CN1445197A (en) | 2003-10-01 |
| TW200306964A (en) | 2003-12-01 |
| JP2003240451A (en) | 2003-08-27 |
| KR100566306B1 (en) | 2006-03-30 |
| KR20030068387A (en) | 2003-08-21 |
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Granted publication date: 20050420 Termination date: 20171225 |