CN101788239B - Method for preparing ceramic thermal storage ball coating phase-change materials - Google Patents
Method for preparing ceramic thermal storage ball coating phase-change materials Download PDFInfo
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Abstract
The invention relates to a method for preparing ceramic thermal storage ball coating phase-change materials. The method is characterized by comprising the following steps: 1) preparing a SiC ceramic spherical shell: a. breaking and ball milling SiC and feldspar to obtain SiC powder and feldspar powder; the raw materials have the following percentage by weight: SiC powder: 75-85%, feldspar powder: 5-10%, kaolin: 10-15%; selecting and ball milling the raw materials to obtain a mixture A; adding water and polyving alcohol solution into the mixture A to prepare pug; b. forming the spherical shell to obtain plastic green body of the spherical shell; c. drying; d. sintering; 2) preparing encapsulation agent pug, the raw materials have the following percentage by weight: SiC powder: 10-20%, low temperature fusion cake: 80-90%; selecting and ball milling the raw materials; adding polyving alcohol solution to the mixture to prepare encapsulation agent pug: 3) encapsulating the encapsulation agent pug to obtain a ceramic thermal storage ball coating phase-change materials. The invention has the characteristics of high heat storage capacity, high thermal conductivity, thermostability, corrosion resistance and low cost.
Description
Technical field
The invention belongs to new energy materials and energy-conservation field of new, be specifically related to a kind of preparation method of ceramic heat-storing sphere of coating phase-change materials, being mainly used in the air is the solar energy thermal-power-generating hold over system of heat transfer medium.
Background technology
The solar energy thermal-power-generating technology is acknowledged as in the renewable energy power generation one of the most promising generation mode; Be that a kind of maturation relatively, cost of electricity-generating are hanged down to reach electrical network is impacted little generation technology, most possibly generate electricity and compete mutually economically with wind-power electricity generation, hydroelectric generation and fossil fuel.Solar heat power generation system generally is to rely on hold over system work, and the output of storage heater is the input of generating set, and the accumulation of heat parameter has very big influence to system operational parameters; Relevant with the performance and the storage heater heat transfer structure of heat-storing material, it requires this heat-storing material thermal storage density big, and thermal shock resistance is good; Can under high temperature (800 ℃～1200 ℃) condition, use, energy is easy to output, and chemical stability is good; Mechanical strength is high, and economical and efficient.The kind and the preparation method of the multiple heat-storing material that occurs in recent years, but all have some shortcoming and defect, be difficult to satisfy the demand of solar energy thermal-power-generating hold over system.As " a kind of preparation method of metal-base composite fused salt as heat accumulating material " (Wang Hua. Chinese invention patent CN1141355C) its method is in the porous metal matrix material, to immerse fuse salt; Then at surperficial electrodeposition layer protecting film; But metal is corrosion-resistant relatively poor with heat-resisting ability, is difficult to satisfy the solar energy thermal-power-generating hold over system and under 800 ℃～1200 ℃ hot conditions, uses; " a kind of preparation technology of organic salt/ceramic base high temperature phase-changing energy storage " (gold; Zhang Renyuan. Chinese invention patent CN1803965A) its method is the ceramic matrix that preparation earlier has the three-dimensional communication hole, under hot conditions, the inorganic salts of fusion is immersed in the ceramic matrix again, this method can be used under the condition about 1000 ℃; Energy storage density is between 227.17～245.43kJ/kg; But shortcoming is a fuse salt still exposes outside, and volatilization influences its result of use easily; " Development of PCM for Recovering HighTemperature Waste Heat and Utilization for Producing Hydrogen by Reforming Reactionof Methane " (Kazushi SATO; Jun-ichiro YAG.International; Vol.42 (2002), No.2.215～219) having proposed a kind of is phase-change material with copper, at its electroplating surface one deck nickel as protective layer; The heat-storing material of this method preparation can use under 1200 ℃ condition; With nickel is that protective layer has certain resistance to corrosion, but this method manufacturing cost is higher, is not suitable in large-scale solar energy heat generating hold over system, using.Therefore, to satisfy with the air be that the heat-storing material used of the solar energy thermal-power-generating of heat transfer medium is significant in R and D.
Summary of the invention:
The object of the invention is the preparation method that a kind of ceramic heat-storing sphere of coating phase-change materials is provided, and this method cost is low.
In order to realize brown purpose, the technical scheme that the present invention taked is: a kind of preparation method of ceramic heat-storing sphere of coating phase-change materials is characterized in that it comprises the steps:
1) preparation of SiC pottery spherical shell:
1. SiC, feldspar is broken respectively, use ball mill ball milling 4h again, cross 200 mesh sieves, obtain SiC powder, feldspar powder, subsequent use;
By the shared percetage by weight of each raw material be: SiC powder 75%-85%, feldspar powder 5%-10%, kaolin 10%-15%, choose SiC powder, feldspar powder and kaolin;
SiC powder, feldspar powder and kaolin are put into ball mill mixing 1h, obtain compound A; Add entry and poly-vinyl alcohol solution among the compound A again, 20min processes pug with the kneader mixing; The addition of water is the 15%-18% of compound A weight, and the addition of poly-vinyl alcohol solution is the 5%-8% of compound A weight, and wherein the concentration of poly-vinyl alcohol solution is 3wt%-5wt%;
2. spherical shell moulding: mould is made up of upper die and lower die, is provided with spherical die cavity in the mould, and the outer aperture on the mould communicates with die cavity, and the diameter of die cavity is 9-11mm;
Get the upper die and lower die that pug fills up mould respectively; In the middle of the pug of counterdie, embed the wax-wrapped pill that diameter is 3.5-4.5mm then; Mold closes; Stay collar extension from the outer aperture of mould to the pug spherical shell in the die cavity of sphere then, be convenient to wax-wrapped pill and when high temperature, volatilize to discharge and burn till back injection phase-change material with spherical shell; Upper die and lower die separately at last, the demoulding obtains the plasticity base substrate of spherical shell;
3. dry: as the plasticity base substrate of spherical shell to be put into chamber dryer with 80-100 ℃ of temperature drying 8-10h, the spherical shell base substrate after obtaining drying;
4. burn till: the spherical shell base substrate after will drying is put into uncovered saggar, puts into shuttle kiln or electrical kiln then and burns till through 1200-1300 ℃, obtains containing the hollow ceramic spherical shell in outer hole;
2) preparation of encapsulants pug:
SiC, low temperature frit is broken respectively, use ball mill ball milling 4h again, cross 200 mesh sieves, obtain SiC powder, low temperature frit powder, subsequent use;
By the shared percetage by weight of each raw material be: SiC powder 10%-20%, low temperature frit 90%-80%, choose SiC powder and low temperature frit powder;
Then SiC powder and low temperature frit powder are put into ball mill mixing 1h, get compound B; Add poly-vinyl alcohol solution among the compound B and be mixed and made into the encapsulants pug; The addition of poly-vinyl alcohol solution is the 10%-15% of compound B weight, and wherein the concentration of poly-vinyl alcohol solution is 3wt%-5wt%;
3) encapsulation: inject phase-change material the cavity in the outer Kong Zhongxiang pottery spherical shell 5 from ceramic spherical shell, the volume of phase-change material is 2/3 of the interior cavity volume of ceramic spherical shell; The place, hole fills out the encapsulants pug outside then, obtains spheroid; Spheroid is put into chamber dryer with 80-100 ℃ of dry 8-10h; Then the encapsulant of spheroid is put into up and be placed in saggar; Facing to the heating of encapsulants pug instantaneous fusion of encapsulants pug and ceramic spherical shell are combined together with the oxygen welding rifle, obtain a kind of ceramic heat-storing sphere of coating phase-change materials.
Described phase-change material is NaCl, KNO
3, KCl, KF, perhaps alloys such as Mg-Zn, Al-Cu, Mg-Al, Mg-Cu.
The invention has the beneficial effects as follows: the ceramic heat-storing sphere of a kind of coating phase-change materials of the present invention preparation has heat storage capacity height (thermal storage density is 407KJ/kg), high thermal conductivity [40W/ (mK) (1000 ℃)], high temperature resistant (800 ℃～1200 ℃ high temperature), corrosion-resistant (acid resistance is more than 90%; Alkali resistance is more than 80%), characteristics that cost is low (manufacturing cost of this method is lower than other high temperature class heat-storing material, as: its cost per ton be " adopting the galvanoplastic preparation is the heat-storing material of housing parcel copper with the nickel metal " manufacturing cost 1/4).
The present invention is the solar energy thermal-power-generating hold over system of heat transfer medium except being applicable to the air, also can be used for high-temperature heat accumulation fields such as industrial furnace hold over system, high-temp waste gas processing hold over system.
Description of drawings
Fig. 1 is the structural representation of SiC pottery spherical shell plastic pressure forming mould;
Fig. 2 is the structural representation of SiC ceramic heat-storing global shell;
Fig. 3 is the structural representation of the SiC ceramic heat-storing sphere of encapsulation phase-change material;
Fig. 4 is a SiC ceramic heat-storing sphere micro-structure diagram;
Fig. 5 is an encapsulants and the micro-structure diagram that combines of SiC Ceramic Balls matrix.
The specific embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to following embodiment.
Embodiment 1:
A kind of preparation method of ceramic heat-storing sphere of coating phase-change materials, it comprises the steps:
1) preparation of SiC pottery spherical shell:
1. with SiC, feldspar respectively broken [using the jaw crushing crusher machine ,], use ball mill ball milling 4h again, cross 200 mesh sieves, obtain SiC powder, feldspar powder then through the double-roll crusher pair roller, subsequent use;
By the shared percetage by weight of each raw material be: SiC powder 80%, feldspar powder 8%, kaolin 12%, choose SiC powder, feldspar powder and kaolin;
SiC powder, feldspar powder and kaolin are put into ball mill mixing 1h, obtain compound A; Add entry and poly-vinyl alcohol solution among the compound A again, 20min processes pug with the kneader mixing; The addition of water is 16% of a compound A weight, and the addition of poly-vinyl alcohol solution is 6% of a compound A weight, and wherein the concentration of poly-vinyl alcohol solution is 4wt%;
2. spherical shell moulding (adopting the preparation of moulding moulage method): mould is made up of patrix 1 and counterdie 2; Be provided with spherical die cavity in the mould, the outer aperture on the mould communicates with die cavity, and the diameter of die cavity is that 10.2mm is [as shown in Figure 1; Mould is made up of patrix 1 and counterdie 2; Correspondence position is respectively equipped with semi-circular recesses 3 on the upper die and lower die, and the radius of semi-circular recesses is 5.1mm (diameter of die cavity is 10.2mm in the present embodiment), and two semi-circular recesses are harmonious and become the die cavity of a sphere; Correspondence position is respectively equipped with outer hole groove 4 on the upper die and lower die, and outer hole groove communicates with semi-circular recesses, and two outer hole grooves are harmonious and become an outer aperture, and outer aperture communicates with die cavity];
Get the upper die and lower die that pug fills up mould respectively, in the middle of the pug of counterdie, embed the wax-wrapped pill that diameter is 4mm then, the mold that closes [guarantees that wax-wrapped pill is in the middle; Make it when high temperature melt; Form hollow ball shell], (as shown in Figure 2, the diameter of collar extension is 3mm in the present embodiment to stay collar extension 6 from the outer aperture of mould to the pug spherical shell in the die cavity of sphere then; The thickness of pug spherical shell is 3mm), be convenient to wax-wrapped pill and when high temperature, volatilize to discharge and burn till back injection phase-change material with spherical shell; Upper die and lower die separately at last, the demoulding obtains the plasticity base substrate of spherical shell;
3. dry: as the plasticity base substrate of spherical shell to be put into chamber dryer with 90 ℃ of temperature drying 9h, the spherical shell base substrate after obtaining drying;
4. burn till: the spherical shell base substrate after will drying is put into uncovered saggar; Putting into shuttle kiln or electrical kiln then burns till through 1250 ℃; Obtain containing the hollow ceramic spherical shell 5 [containing outer hole 6 (the about 2-3mm of outer bore dia), the hollow ceramic spherical shell (as shown in Figure 2) of the about 10mm of diameter, the about 3mm of wall thickness] in outer hole 6;
2) preparation of encapsulants pug:
SiC, commercially available low temperature frit are distinguished fragmentation, use ball mill ball milling 4h again, cross 200 mesh sieves, obtain SiC powder, low temperature frit powder, subsequent use; Low temperature frit adopts existing product (producing like Jin Jing chemical plant, Zibo);
By the shared percetage by weight of each raw material be: SiC powder 15%, low temperature frit 85%, choose SiC powder and low temperature frit powder;
Then SiC powder and low temperature frit powder are put into ball mill mixing 1h, get compound B; Add poly-vinyl alcohol solution among the compound B and be mixed and made into the encapsulants pug; The addition of poly-vinyl alcohol solution is 12% of a compound B weight, and wherein the concentration of poly-vinyl alcohol solution is 4wt%;
3) encapsulation: inject phase-change material in the cavity the outer hole 6 from ceramic spherical shell 5 to ceramic spherical shell 5 in, the volume of phase-change material is 2/3 of the interior cavity volume of ceramic spherical shell 5; 6 places, hole fill out encapsulants pug 7 outside then, obtain spheroid; Spheroid is put into chamber dryer with 90 ℃ of dry 9h; Then the encapsulant of spheroid is put into up and be placed in saggar; Facing to the heating of encapsulants pug 7 instantaneous fusions of encapsulants pug and ceramic spherical shell 5 are combined together with the oxygen welding rifle and [guarantee that phase change material inside does not flow out; Reach the purpose (Fig. 3) of encapsulation after to be packaged dose of cooling], obtain a kind of ceramic heat-storing sphere of coating phase-change materials.
Described phase-change material is NaCl.
Through test, the performance of the ceramic heat-storing sphere of a kind of coating phase-change materials that present embodiment 1 obtains is following:
1, adopt with SiC be the ceramic material of primary raw material as case material, phase-change material is encapsulated in spherical shell inside, avoid phase-change material volatilization and run off (as shown in Figure 3); And the SiC pottery itself has high temperature resistant; Thermal storage density is high, and corrosion resistance is strong, the advantage that thermal shock resistance is good.
2, this method has been given full play to the latent-heat storage of phase-change material and the advantage of ceramic material sensible heat accumulation of heat, and two kinds of heat accumulation methods are combined, and heat storage capacity is high, and thermal storage density is 407KJ/kg, thermal conductivity big [40W/ (mK) (1000 ℃)].
3, high temperature resistant, can under 800 ℃～1200 ℃ hot conditions, stablize use.
4, contain in the ceramic shell material microstructure in a large number and be the mullite of needle bar shape (as shown in Figure 4), (compression strength reaches 30MPa～40MPa) and thermal shock resistance preferably to make it have higher intensity.
5, the microscopic appearance at encapsulant place (as shown in Figure 5) shows that encapsulants combines well with ceramic matrix.
6, the manufacturing cost of this method is lower than other high temperature class heat-storing material, as: its cost per ton is 1/4 of " adopting the galvanoplastic preparation is the heat-storing material of housing parcel copper with the nickel metal " manufacturing cost.
7, corrosion-resistant, acid resistance is that alkali resistance is more than 80% more than 90%.
Embodiment 2:
A kind of preparation method of ceramic heat-storing sphere of coating phase-change materials, it comprises the steps:
1) preparation of SiC pottery spherical shell:
1. with SiC, feldspar respectively broken [using the jaw crushing crusher machine ,], use ball mill ball milling 4h again, cross 200 mesh sieves, obtain SiC powder, feldspar powder then through the double-roll crusher pair roller, subsequent use;
By the shared percetage by weight of each raw material be: SiC powder 75%, feldspar powder 10%, kaolin 15%, choose SiC powder, feldspar powder and kaolin;
SiC powder, feldspar powder and kaolin are put into ball mill mixing 1h, obtain compound A; Add entry and poly-vinyl alcohol solution among the compound A again, 20min processes pug with the kneader mixing; The addition of water is 15% of a compound A weight, and the addition of poly-vinyl alcohol solution is 5% of a compound A weight, and wherein the concentration of poly-vinyl alcohol solution is 3wt%;
2. spherical shell moulding (adopting the preparation of moulding moulage method): mould is made up of patrix 1 and counterdie 2; Be provided with spherical die cavity in the mould, the outer aperture on the mould communicates with die cavity, and the diameter of die cavity is that 9mm is [as shown in Figure 1; Mould is made up of patrix 1 and counterdie 2; Correspondence position is respectively equipped with semi-circular recesses 3 on the upper die and lower die, and the radius of semi-circular recesses is 4.5mm, and two semi-circular recesses are harmonious and become the die cavity of a sphere; Correspondence position is respectively equipped with outer hole groove 4 on the upper die and lower die, and outer hole groove communicates with semi-circular recesses, and two outer hole grooves are harmonious and become an outer aperture, and outer aperture communicates with die cavity];
Get the upper die and lower die that pug fills up mould respectively; In the middle of the pug of counterdie, embed the wax-wrapped pill that diameter is 3.5mm then; Mold [guarantee that wax-wrapped pill in the middle, makes it when high temperature melt, form hollow ball shell] closes; Stay collar extension 6 from the outer aperture of mould to the pug spherical shell in the die cavity of sphere then, be convenient to wax-wrapped pill and when high temperature, volatilize to discharge and burn till back injection phase-change material with spherical shell; Upper die and lower die separately at last, the demoulding obtains the plasticity base substrate of spherical shell;
3. dry: as the plasticity base substrate of spherical shell to be put into chamber dryer with 80 ℃ of temperature drying 8h, the spherical shell base substrate after obtaining drying;
4. burn till: the spherical shell base substrate after will drying is put into uncovered saggar, puts into shuttle kiln or electrical kiln then and burns till through 1200 ℃, obtains containing the hollow ceramic spherical shell 5 in outer hole 6;
2) preparation of encapsulants pug:
SiC, commercially available low temperature frit are distinguished fragmentation, use ball mill ball milling 4h again, cross 200 mesh sieves, obtain SiC powder, low temperature frit powder, subsequent use; Low temperature frit adopts existing product (producing like Jin Jing chemical plant, Zibo);
By the shared percetage by weight of each raw material be: SiC powder 10%, low temperature frit 90%, choose SiC powder and low temperature frit powder;
Then SiC powder and low temperature frit powder are put into ball mill mixing 1h, get compound B; Add poly-vinyl alcohol solution among the compound B and be mixed and made into the encapsulants pug; The addition of poly-vinyl alcohol solution is 10% of a compound B weight, and wherein the concentration of poly-vinyl alcohol solution is 3wt%;
3) encapsulation: inject phase-change material in the cavity the outer hole 6 from ceramic spherical shell 5 to ceramic spherical shell 5 in, the volume of phase-change material is 2/3 of the interior cavity volume of ceramic spherical shell 5; 6 places, hole fill out encapsulants pug 7 outside then, obtain spheroid; Spheroid is put into chamber dryer with 80 ℃ of dry 8h; Then the encapsulant of spheroid is put into up and be placed in saggar; Facing to the heating of encapsulants pug 7 instantaneous fusions of encapsulants pug and ceramic spherical shell 5 are combined together with the oxygen welding rifle, obtain a kind of ceramic heat-storing sphere of coating phase-change materials.
Described phase-change material is KNO
3
Through test; The performance of the ceramic heat-storing sphere of a kind of coating phase-change materials that present embodiment 2 obtains is following: high (thermal storage density is 407KJ/kg), the high thermal conductivity [40W/ (mK) (1000 ℃)] of heat storage capacity, high temperature resistant (800 ℃～1200 ℃ high temperature), corrosion-resistant (acid resistance is more than 90%; Alkali resistance is more than 80%), characteristics that cost is low (manufacturing cost of this method is lower than other high temperature class heat-storing material, as: its cost per ton be " adopting the galvanoplastic preparation is the heat-storing material of housing parcel copper with the nickel metal " manufacturing cost 1/4).
Embodiment 3:
A kind of preparation method of ceramic heat-storing sphere of coating phase-change materials, it comprises the steps:
1) preparation of SiC pottery spherical shell:
1. with SiC, feldspar respectively broken [using the jaw crushing crusher machine ,], use ball mill ball milling 4h again, cross 200 mesh sieves, obtain SiC powder, feldspar powder then through the double-roll crusher pair roller, subsequent use;
By the shared percetage by weight of each raw material be: SiC powder 85%, feldspar powder 5%, kaolin 10%, choose SiC powder, feldspar powder and kaolin;
SiC powder, feldspar powder and kaolin are put into ball mill mixing 1h, obtain compound A; Add entry and poly-vinyl alcohol solution among the compound A again, 20min processes pug with the kneader mixing; The addition of water is 18% of a compound A weight, and the addition of poly-vinyl alcohol solution is 8% of a compound A weight, and wherein the concentration of poly-vinyl alcohol solution is 5wt%;
2. spherical shell moulding (adopting the preparation of moulding moulage method): mould is made up of patrix 1 and counterdie 2; Be provided with spherical die cavity in the mould, the outer aperture on the mould communicates with die cavity, and the diameter of die cavity is that 11mm is [as shown in Figure 1; Mould is made up of patrix 1 and counterdie 2; Correspondence position is respectively equipped with semi-circular recesses 3 on the upper die and lower die, and the radius of semi-circular recesses is 5.5mm, and two semi-circular recesses are harmonious and become the die cavity of a sphere; Correspondence position is respectively equipped with outer hole groove 4 on the upper die and lower die, and outer hole groove communicates with semi-circular recesses, and two outer hole grooves are harmonious and become an outer aperture, and outer aperture communicates with die cavity];
Get the upper die and lower die that pug fills up mould respectively; In the middle of the pug of counterdie, embed the wax-wrapped pill that diameter is 4.5mm then; Mold [guarantee that wax-wrapped pill in the middle, makes it when high temperature melt, form hollow ball shell] closes; Stay collar extension 6 from the outer aperture of mould to the pug spherical shell in the die cavity of sphere then, be convenient to wax-wrapped pill and when high temperature, volatilize to discharge and burn till back injection phase-change material with spherical shell; Upper die and lower die separately at last, the demoulding obtains the plasticity base substrate of spherical shell;
3. dry: as the plasticity base substrate of spherical shell to be put into chamber dryer with 100 ℃ of temperature drying 10h, the spherical shell base substrate after obtaining drying;
4. burn till: the spherical shell base substrate after will drying is put into uncovered saggar, puts into shuttle kiln or electrical kiln then and burns till through 1300 ℃, obtains containing the hollow ceramic spherical shell 5 in outer hole 6;
2) preparation of encapsulants pug:
SiC, commercially available low temperature frit are distinguished fragmentation, use ball mill ball milling 4h again, cross 200 mesh sieves, obtain SiC powder, low temperature frit powder, subsequent use; Low temperature frit adopts existing product (producing like Jin Jing chemical plant, Zibo);
By the shared percetage by weight of each raw material be: SiC powder 20%, low temperature frit 80%, choose SiC powder and low temperature frit powder;
Then SiC powder and low temperature frit powder are put into ball mill mixing 1h, get compound B; Add poly-vinyl alcohol solution among the compound B and be mixed and made into the encapsulants pug; The addition of poly-vinyl alcohol solution is 15% of a compound B weight, and wherein the concentration of poly-vinyl alcohol solution is 5wt%;
3) encapsulation: inject phase-change material in the cavity the outer hole 6 from ceramic spherical shell 5 to ceramic spherical shell 5 in, the volume of phase-change material is 2/3 of the interior cavity volume of ceramic spherical shell 5; 6 places, hole fill out encapsulants pug 7 outside then, obtain spheroid; Spheroid is put into chamber dryer with 100 ℃ of dry 10b; Then the encapsulant of spheroid is put into up and be placed in saggar; Facing to the heating of encapsulants pug 7 instantaneous fusions of encapsulants pug and ceramic spherical shell 5 are combined together with the oxygen welding rifle, obtain a kind of ceramic heat-storing sphere of coating phase-change materials.
Described phase-change material is the Mg-Zn alloy.
Through test; The performance of the ceramic heat-storing sphere of a kind of coating phase-change materials that present embodiment 3 obtains is following: high (thermal storage density is 407KJ/kg), the high thermal conductivity [40W/ (mK) (1000 ℃)] of heat storage capacity, high temperature resistant (800 ℃～1200 ℃ high temperature), corrosion-resistant (acid resistance is more than 90%; Alkali resistance is more than 80%), characteristics that cost is low (manufacturing cost of this method is lower than other high temperature class heat-storing material, as: its cost per ton be " adopting the galvanoplastic preparation is the heat-storing material of housing parcel copper with the nickel metal " manufacturing cost 1/4).
The present invention is applicable to all phase-change materials, does not enumerate embodiment one by one at this.
Claims (1)
1. the preparation method of the ceramic heat-storing sphere of a coating phase-change materials is characterized in that it comprises the steps:
1) preparation of SiC pottery spherical shell:
1. SiC, feldspar is broken respectively, use ball mill ball milling 4h again, cross 200 mesh sieves, obtain SiC powder, feldspar powder, subsequent use;
By the shared percetage by weight of each raw material be: SiC powder 75%-85%, feldspar powder 5%-10%, kaolin 10%-15%, choose SiC powder, feldspar powder and kaolin;
SiC powder, feldspar powder and kaolin are put into ball mill mixing 1h, obtain compound A; Add entry and poly-vinyl alcohol solution among the compound A again, 20min processes pug with the kneader mixing; The addition of water is the 15%-18% of compound A weight, and the addition of poly-vinyl alcohol solution is the 5%-8% of compound A weight, and wherein the concentration of poly-vinyl alcohol solution is 3wt%-5wt%;
2. spherical shell moulding: mould is made up of upper die and lower die, is provided with spherical die cavity in the mould, and the outer aperture on the mould communicates with die cavity, and the diameter of die cavity is 9-11mm;
Get the upper die and lower die that pug fills up mould respectively; In the middle of the pug of counterdie, embed the wax-wrapped pill that diameter is 3.5-4.5mm then; Mold closes; Stay collar extension from the outer aperture of mould to the pug spherical shell in the die cavity of sphere then, be convenient to wax-wrapped pill and when high temperature, volatilize to discharge and burn till back injection phase-change material with spherical shell; Upper die and lower die separately at last, the demoulding obtains the plasticity base substrate of spherical shell;
3. dry: as the plasticity base substrate of spherical shell to be put into chamber dryer with 80-100 ℃ of temperature drying 8-10h, the spherical shell base substrate after obtaining drying;
4. burn till: the spherical shell base substrate after will drying is put into uncovered saggar, puts into shuttle kiln or electrical kiln then and burns till through 1200-1300 ℃, obtains containing the hollow ceramic spherical shell in outer hole;
2) preparation of encapsulants pug:
SiC, low temperature frit is broken respectively, use ball mill ball milling 4h again, cross 200 mesh sieves, obtain SiC powder, low temperature frit powder, subsequent use;
By the shared percetage by weight of each raw material be: SiC powder 10%-20%, low temperature frit 90%-80%, choose SiC powder and low temperature frit powder;
Then SiC powder and low temperature frit powder are put into ball mill mixing 1h, get compound B; Add poly-vinyl alcohol solution among the compound B and be mixed and made into the encapsulants pug; The addition of poly-vinyl alcohol solution is the 10%-15% of compound B weight, and wherein the concentration of poly-vinyl alcohol solution is 3wt%-5wt%;
3) encapsulation: inject phase-change material the cavity in the outer Kong Zhongxiang pottery spherical shell from ceramic spherical shell, the volume of phase-change material is 2/3 of the interior cavity volume of ceramic spherical shell; The place, hole fills out the encapsulants pug outside then, obtains spheroid; Spheroid is put into chamber dryer with 80-100 ℃ of dry 8-10h; Then the encapsulant of spheroid is put into up and be placed in saggar; Facing to the heating of encapsulants pug instantaneous fusion of encapsulants pug and ceramic spherical shell are combined together with the oxygen welding rifle, obtain a kind of ceramic heat-storing sphere of coating phase-change materials.
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| CN102757228B (en) * | 2011-04-26 | 2014-08-06 | 中国科学院声学研究所 | Preparation method of piezoelectric ceramic spherical shell |
| CN102353081A (en) * | 2011-06-15 | 2012-02-15 | 朱巧荣 | Ceramic plate and its production technology |
| CN102568624B (en) * | 2011-12-05 | 2015-07-08 | 李正蔚 | High-temperature supercritical nuclear reactor |
| CN102563641B (en) * | 2011-12-30 | 2014-11-05 | 西安交通大学 | Heat storage type combustor powered by liquid fuel |
| CN102538230B (en) * | 2011-12-30 | 2013-11-06 | 西安交通大学 | Solar phase change thermal storage heating apparatus and method |
| CN104059611A (en) * | 2013-03-19 | 2014-09-24 | 张曹 | Phase-change material packaging process and phase change heat storage product |
| US9879166B1 (en) * | 2014-06-16 | 2018-01-30 | University Of South Florida | Encapsulation of thermal energy storage media |
| CN104227495B (en) * | 2014-07-31 | 2016-05-18 | 浙江大学 | A kind of heat transferring medium and the cooling device of this heat transferring medium is installed |
| CN105481344A (en) * | 2015-12-17 | 2016-04-13 | 上海高诚创意科技集团有限公司 | Method for preparing ceramics capable of repeatedly storing heat |
| CN105810812B (en) * | 2016-05-04 | 2018-03-06 | 中国科学院上海应用物理研究所 | A kind of assemble method of spherical high-temperature phase transition heat storage element and the heat accumulation element being consequently formed |
| CN107062971B (en) * | 2017-03-27 | 2019-02-19 | 上海交通大学 | A kind of efficient phase-change energy storage packaging body |
| CN107940782B (en) * | 2017-11-02 | 2020-09-01 | 武汉理工大学 | Low-cost solar thermal power generation sensible heat-latent heat composite heat storage ceramic and preparation method thereof |
| CN108534578B (en) * | 2018-03-07 | 2019-11-26 | 西安交通大学 | A kind of preparation method of packed bed heat-storing device and heat accumulation ball |
| CN110513757A (en) * | 2019-08-12 | 2019-11-29 | 同济大学 | A kind of phase-transition heat-storage heating installation |
| CN112683095B (en) * | 2020-12-28 | 2022-04-01 | 武汉科技大学 | Composite whisker reinforced composite phase-change heat storage ball and preparation method thereof |
| CN112851403A (en) * | 2021-02-04 | 2021-05-28 | 西安建筑科技大学 | Hollow phase change energy storage ceramsite and preparation method thereof |
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| DE3035386C2 (en) * | 1980-09-19 | 1985-08-29 | Apparatebau Rothemühle Brandt + Kritzler GmbH, 5963 Wenden | Use of heat-transferring elements designed as hollow spheres or as hollow polyhedra in a regenerative heat exchanger |
| DE3101039A1 (en) * | 1981-01-15 | 1982-08-05 | Hoechst Ag, 6000 Frankfurt | Heat store and heat exchanger |
| JPH11264682A (en) * | 1998-03-18 | 1999-09-28 | Ishikawajima Harima Heavy Ind Co Ltd | Thermal storage medium utilizing latent heat |
| CN1141355C (en) * | 2002-06-17 | 2004-03-10 | 昆明理工大学 | Process for preparing metal-base composite fused salt as heat accumulating material |
| CN1141356C (en) * | 2002-11-16 | 2004-03-10 | 昆明理工大学 | Preparation technology of package type composite thermophore |
| WO2005021147A2 (en) * | 2003-02-06 | 2005-03-10 | William Marsh Rice University | High strength polycrystalline ceramic spheres |
| CN1803965A (en) * | 2005-12-15 | 2006-07-19 | 广东工业大学 | Process for preparing organic salt/ceramic base high temperature phase-changing energy-storing material |
| DE102008009789B4 (en) * | 2008-02-19 | 2012-01-05 | Eswa Deutschland Gmbh | Radiator with latent heat storage |
| JP2009274934A (en) * | 2008-05-16 | 2009-11-26 | Yazaki Corp | Method of manufacturing ceramic hollow particle, and ceramic hollow particle |
| RU2377371C1 (en) * | 2008-06-23 | 2009-12-27 | Владимир Иванович Степунин | Hollow-porous ceramic brick-block for construction of homogenous walls and work procedure |
| CN201373697Y (en) * | 2009-01-16 | 2009-12-30 | 严金泉 | Spherical ceramic heat accumulator structure |
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