CN112299851A - Ceramic wire mesh corrugated medium material with high thermal shock resistance and preparation method and application thereof - Google Patents
Ceramic wire mesh corrugated medium material with high thermal shock resistance and preparation method and application thereof Download PDFInfo
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- C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
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- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
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- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
Abstract
The invention relates to the technical field of porous ceramics, in particular to a ceramic wire mesh corrugated medium material with high thermal shock resistance, and a preparation method and application thereof. Based on the structural design of the wire mesh medium material with adjustable composition material and/or structure, the obtained material can meet the application requirements of the porous medium burner and the solar air heat absorber by combining the optimization of the material and the structure and the preparation method. The medium material is formed by combining a plurality of layers of ceramic wire mesh corrugated sheets macroscopically, the wire mesh is of a solid or hollow structure, the aperture of meshes surrounded by the wire mesh is 2-50 meshes, the area ratio of the meshes is 50-95%, the composition material is preferably but not limited to silicon carbide, silicon nitride and/or sialon, and the preparation method is preferably but not limited to reaction sintering. The invention is suitable for a medium material of a porous medium burner and a solar air heat absorber, and aims to solve the problems of poor thermal shock resistance, easy damage under the condition of large thermal shock and large fluid resistance of the conventional ceramic foam medium.
Description
The technical field is as follows:
the invention relates to the technical field of porous ceramics, in particular to a ceramic wire mesh corrugated medium material with high thermal shock resistance, a preparation method and application thereof, which can be used as a medium material in a porous medium burner and a solar air heat absorber, is particularly suitable for the working condition requirement of high stability of the medium material, and has excellent comprehensive properties of high strength, low flow resistance, high heat resistance and high thermal shock resistance.
Background art:
in the porous medium combustion technology and the solar air thermal power generation, the porous material plays the key role of tissue combustion and heat transfer-exchange, especially in the porous medium combustion technology field, along with the higher power density of the combustion device (>1.5MW/m2Grade), increasing the load on the dielectric material, and the material needs to meet the technical and economic performance requirements of high strength, high heat conductivity, high temperature resistance, oxidation resistance, thermal shock resistance, low cost and the like. In the solar air thermal power generation technology, most of the heat absorbing bodies in the prior art are honeycomb ceramics or ceramic foam heat absorbing bodies, the honeycomb ceramics have the advantage of reduction, but due to structural limitation, heat transfer-heat exchange is one-dimensional and one-way, the heat exchange efficiency is not high, the ceramic foam has the advantages of three-dimensional heat transfer-heat exchange compared with the heat absorbing body material, the ceramic foam has higher heat exchange capacity compared with the honeycomb ceramics, but the flow resistance of high-temperature air in the ceramic foam is larger, and the energy consumption of a fan is larger. In short, the existing porous ceramic medium is difficult to meet the requirements of further development of two technologies, and a long-life porous ceramic material with low flow resistance, better temperature resistance and stronger thermal damage resistance is required to be developed.
As a more common porous medium material, the ceramic foam is mainly made of silicon carbide, aluminum oxide, zirconium oxide and the like. However, the ceramic foam has some problems, firstly, a template for preparing the ceramic foam is foamed polyurethane foam, the disorder and irregularity of the internal pore structure of the ceramic foam are determined in the foaming process, and further the fluid resistance of the foam material is larger, the large flow resistance means that the premixed gas needs larger conveying pressure when being applied to the porous medium combustion technology, the nonuniformity of gas distribution is easily increased, the temperature uniformity of a combustion surface is worsened, the material is easily damaged due to large thermal stress, and meanwhile, according to the research, the ignition difficulty, the time for completely entering a porous combustion state, the control difficulty degree of the combustion process and the like are obviously related to the fluid resistance of the material; for solar air thermal power generation, a large air flow resistance means a large air delivery pressure, and this part of energy consumption tends to be large. Secondly, the configuration of the polyurethane foam template determines the hole type structure of the final ceramic foam product, the adjustment is not available, under the working conditions of porous medium combustion and solar thermal power generation, rapid cooling and rapid heating exist, the temperature difference of the material is large, the thermal stress in the use of the material is large, and the thermal shock damage of the material is easily caused.
In view of the limitations that the ceramic foam has large fluid resistance and a hole-shaped structure does not have adjustability, and the flow resistance cannot be reduced and the thermal shock resistance of the material cannot be improved through structure adjustment, the invention innovatively provides a ceramic wire mesh corrugated medium material, and a systematic solution is provided in various aspects such as a wire mesh structure, a wire mesh configuration, a corrugated shape, preferable material, preferable preparation process and the like, so that the ceramic wire mesh corrugated medium material with high thermal shock resistance is obtained. The ceramic wire mesh corrugated medium material has the characteristic of low flow resistance while maintaining the medium function, improves the thermal shock resistance of the material through the optimization of the structure, and improves the use limit and the operation elasticity of the material.
The invention content is as follows:
the invention aims to solve the problems of large flow resistance, weak thermal shock resistance and poor overall mechanical property of the existing ceramic porous medium for porous medium combustion and solar air thermal power generation in the production and practical processes.
The technical scheme of the invention is as follows:
the ceramic wire mesh corrugated medium material with high thermal shock resistance is basically composed of a corrugated ceramic wire mesh material, the wire mesh material contains a ceramic material and wire mesh wires with adjustable structures, the wire mesh wires form wire mesh holes with adjustable hole patterns, a single layer or more than two layers of ceramic wire mesh corrugated medium material plates are superposed to form the ceramic wire mesh corrugated medium material with a through hole structure, and the ceramic material, the wire mesh wires and the wire mesh hole patterns are the same or different.
The ceramic wire mesh corrugated medium material with high thermal shock resistance is characterized in that the wire mesh contained in the ceramic wire mesh corrugated medium material plate is of a solid or hollow structure; the screen hole type structure contained in the ceramic screen corrugated medium material sheet is one or more than two of a circular structure, an oval structure, a conventional polygon structure, a variant polygon structure, a graded polygon structure, a chiral structure or an anti-chiral structure; the corrugated shape of the ceramic wire mesh corrugated medium material sheet is one or more than two of the following shapes: triangular, vertex-smooth triangular, square wave, vertex-smooth square wave, trapezoidal wave, vertex-smooth trapezoidal wave, sinusoidal wave.
The ceramic wire mesh corrugated medium material with high thermal shock resistance is characterized in that superposed ceramic wire mesh corrugated medium material sheets are vertically arranged, and planes of wave crests or wave troughs of the ceramic wire mesh corrugated medium material sheets are parallel to each other; the directions of the wave crest lines or the wave trough lines of the corrugations and the vertical direction have an inclination angle of between 15 and 85 degrees, and the inclination angles of the adjacent corrugated medium material sheets of the ceramic silk screen are the same and are opposite in direction.
The ceramic wire mesh corrugated medium material with high thermal shock resistance is characterized in that the aperture of a wire mesh hole of the ceramic wire mesh corrugated medium material plate is 2-50 meshes, the area ratio of the wire mesh hole is 50-95%, and the ceramic material is silicon carbide, silicon nitride, SiAlON (SiAlON) or zirconia.
The ceramic wire mesh corrugated medium material with high thermal shock resistance is characterized in that the corrugated shape of the ceramic wire mesh corrugated medium material sheet is one or more than two of a triangle, a vertex smooth triangle, a sine wave waveform and a smooth wave, the size and the structure of the corrugation are adjustable, the peak height H is between 3 mm and 20mm, and the corrugation angle alpha is between 30 degrees and 150 degrees; if the corrugation is sine wave or smooth wave, the corrugation angle alpha is calculated by the connecting line included angle of the top points of adjacent wave peaks.
Preferably, in the ceramic wire mesh corrugated medium material plate with high thermal shock resistance, the peak height H is 3-8 mm, and the corrugation angle alpha is 60-120 degrees.
The preparation method of the ceramic wire mesh corrugated medium material with high thermal shock resistance comprises the following steps:
(1) selecting a single layer or more than two layers of organic silk screens as template materials;
(2) uniformly coating ceramic slurry on an organic material wire mesh by adopting a gas spraying, airless spraying or slurry dipping process, then placing the organic material wire mesh on one surface of a heated split forming die, closing the die, heating, curing and forming to obtain the organic material corrugated plate coated with the ceramic slurry; or adopting a heated corrugated pair roller to extrude, solidify and mold the organic material silk screen coated with the ceramic slurry between the pair roller to obtain the organic material corrugated plate coated with the ceramic slurry, wherein the shape of the corrugation is controlled by the shape of the mold according to the actual condition;
(3) recoating
Continuously and repeatedly coating the organic corrugated plate coated with the ceramic slurry obtained in the step (2) by adopting a gas spraying, airless spraying or slurry dipping process, drying by hot air between two adjacent spraying or dipping processes, and specifically setting and adjusting the circulating coating times of the slurry according to different pore diameters and strength requirements to obtain a precursor of the corrugated dielectric material plate of the ceramic silk screen;
(4) the same ceramic slurry is used as a bonding agent, the precursors of the ceramic wire mesh corrugated medium material plate are combined in a parallel overlapping mode, the same ceramic slurry is bonded to form a medium material plate structure, then the medium material plate structure is processed and formed into a required medium material plate shape, and the ceramic wire mesh corrugated medium with high thermal shock resistance is formed through sintering.
The preparation method of the ceramic wire mesh corrugated medium material with high thermal shock resistance comprises the following steps of (1) using an organic wire mesh as a template material, wherein the material of the organic wire mesh is one or more than two of polyethylene, polystyrene, polyurethane, nylon polypropylene and polyvinyl chloride; the mesh pattern of the organic material mesh is one or more than two of a circle, a triangle, a quadrangle and a hexagon.
In the step (4), different sintering methods are adopted in the sintering process according to different ceramic types, the silicon carbide material is sintered in an oxide bonding mode or a siliconizing sintering process, and the silicon nitride, the zirconium oxide or the sialon is sintered in a mode of adding a sintering aid.
The ceramic wire mesh corrugated medium material with high thermal shock resistance is applied to porous medium burner media or heat absorbers of solar air heat absorbers.
The design idea of the invention is as follows:
due to the disorder of the pore structure, the mole number of gaseous substances generated by combustion reaction in the combustion process of gas is increased by several times, and in the process of porous medium combustion or solar air thermal power generation heat exchange, the temperature of the gas medium can be increased to 800-1000 ℃ from normal temperature, particularly in the combustion process of the porous medium, the temperature of combustion product smoke can reach 1300 ℃ or higher, the gas volume expands greatly, and therefore, larger resistance can be generated when the gas medium passes through the porous medium, under the condition, in the combustion process of the porous medium, along with the increase of the gas flow velocity and the increase of the resistance, the combustion organization is difficult and is difficult to control; in the solar thermal power generation process, the air resistance is increased, the pressure head of the fan is increased, and the energy consumption of the system is improved.
In order to solve the problems, the invention is based on the structure design (wire mesh and corrugated structure) of the wire mesh medium material with adjustable composition material and/or structure, and combines the optimization and preparation method of the material and the structure, and the obtained material can meet the application requirements of a porous medium burner and a solar air heat absorber. The medium material is formed by combining a plurality of layers of ceramic wire mesh corrugated sheets macroscopically, the wire mesh is of a solid or hollow structure, the aperture of meshes surrounded by the wire mesh is 2-50 meshes (preferably 10-30 meshes), the area ratio of the meshes is 50% -95%, the composition material is preferably but not limited to silicon carbide, silicon nitride and/or sialon, and the preparation method is preferably but not limited to reaction sintering. The invention has the characteristics of high overall strength, high temperature resistance, oxidation resistance, high thermal shock resistance and the like, and simultaneously has lower fluid resistance, thereby being beneficial to the control of the porous medium combustion process and the reduction of the energy consumption in the solar air heat absorption process.
The invention develops a ceramic wire mesh corrugated medium material with high thermal shock resistance, which has the following advantages and beneficial effects:
1. the dielectric material prepared by the ceramic wire mesh corrugated plate can obtain a straight-through fluid channel structure on the structure because the selectivity, the corrugation configuration and the combined inclination angle of the wire mesh can be randomly adjusted, so that the flow resistance is obviously reduced, the thermal shock resistance of the material can be improved through the optimization of the structure, and the use limit of the material is improved.
2. The ceramic silk screen corrugated medium material is prepared by taking an organic polymer silk screen as a template, impregnating slurry to obtain a corrugated plate shape suitable for the structural requirement of the medium material, assembling the corrugated plate shape into a medium material disc, and sintering.
3. The medium material prepared by the ceramic wire mesh corrugated plate has the specific surface area equivalent to or larger than that of ceramic foam, so that the medium material has higher heat transfer and exchange efficiency.
Description of the drawings:
FIGS. 1(a) -1 (b) are schematic views of the corrugated plate assembly of the ceramic wire mesh corrugated medium material with high thermal shock resistance of the present invention. Wherein fig. 1(a) is a vertical schematic view of a single sheet of wire mesh corrugated board; FIG. 1(b) is a schematic diagram showing the vertical arrangement and superposition of a plurality of corrugated plates of a silk screen.
FIGS. 2(a) -2 (b) are screen hole patterns of the ceramic screen corrugated dielectric material with high thermal shock resistance of the present invention. Wherein, fig. 2(a) is a circle; fig. 2(b) is an oval shape.
FIGS. 3(a) -3 (c) are wire mesh patterns-regular polygon patterns of the ceramic wire mesh corrugated dielectric material of the present invention with high thermal shock resistance: FIG. 3(a) is a trilateral; FIG. 3(b) is a quadrilateral; FIG. 3(c) is a regular hexagon; wherein a and b represent the respective feature sizes, and α represents the angle between the feature sizes.
FIGS. 4(a) -4 (c) show the types of the corrugated shapes S of the corrugated sheets in the ceramic wire mesh corrugated medium material with high thermal shock resistance according to the present invention. Wherein, fig. 4(a) is a triangular corrugation, H represents a peak height, α represents a corrugation angle, and l represents a wave distance; fig. 4(b) and 4(c) are top smooth triangle and sine wave shaped tunnel structures, respectively, where H represents the peak height, α represents the corrugation angle, and l represents the wave distance.
FIG. 5 is a physical diagram of a circular plate made of the ceramic wire mesh corrugated medium material with high thermal shock resistance (the diameter of the wire mesh is 30 meshes, the material is silicon nitride), and the structure of channels between sheets after the corrugated sheets are combined can be seen from the diagram.
FIGS. 6(a) to 6(b) show the corrugated medium material of the ceramic wire mesh with high thermal shock resistance (the diameter of the wire mesh is 10 meshes, and the material is silicon-impregnated silicon carbide) according to the present invention. Wherein, FIG. 6(a) is a 10 mesh wire mesh corrugated circular plate diagram; fig. 6(b) is a schematic view of the channels of the corrugated dielectric material of the ceramic mesh.
The specific implementation mode is as follows:
in the specific implementation process, the required dielectric material structure is formed by superposing and combining ceramic wire mesh corrugated plates with corrugated geometric shapes; the corrugated plates in the material structure are vertically arranged, the plates are mutually and parallelly superposed, the parallel direction of the corrugations and the vertical direction of the material block body have an inclination angle (preferably 20-60 degrees) between 15-85 degrees, and the inclination angles of the corrugations of the adjacent corrugated plates are the same and opposite in direction. The organic silk screen is coated with ceramic slurry and then is subjected to compression molding or double-roller extrusion molding to obtain a silk screen corrugated plate precursor, and then the silk screen corrugated plate precursor is coated to the required surface density and assembled into a material disc (block), and then the material disc (block) is degreased and sintered to obtain the ceramic silk screen corrugated medium material.
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
In this embodiment, the preparation method of the ceramic wire mesh corrugated medium material is as follows:
firstly, the slurry is coated on the organic nylon wire mesh in an airless spraying manner, and then the precursor of the corrugated plate of the ceramic wire mesh is prepared according to the corresponding geometric characteristics (see table 1). And then, adopting the same slurry as an adhesive, superposing and combining the screen corrugated plate precursors in parallel to form a dielectric material structure, bonding according to the required structure requirement, degreasing, adding and molding by a machine, and sintering to obtain the ceramic screen corrugated dielectric material.
In this embodiment, the preparation process of the precursor of the corrugated plate of the ceramic wire mesh is as follows:
(1) silicon carbide wire mesh corrugated medium material:
the mass ratio is 60%: 35%: 5% of silicon carbide powder with the average particle size of 5 mu m, phenolic resin and p-toluenesulfonic acid are dissolved in absolute ethyl alcohol together, and the mixture is mechanically stirred, ball-milled and filtered to obtain slurry, wherein the solid content of the slurry solution is 80% of the total mass. The raw material is evenly sprayed on a 10-mesh polyurethane screen with circular meshes, and the areal density is controlled to be 0.03g/cm2Spreading the coated silk screen on one surface of a split mold which is heated to 120 ℃ and provided with triangular grooves, closing the mold and pressurizing to a limiting position, limiting the position between the molds to ensure that the gap is 0.5mm, preserving heat for 20 seconds and then curing, or extruding and curing the coated silk screen between double rollers to form the coated silk screen into a corrugated shape which is the same as that of the double-roller mold, spraying the coated silk screen to a certain surface density again after opening the mold, wherein the surface density is controlled to be 0.1g/cm2But ensuring that the pore of the silk screen is opened, drying and curing at 150 ℃ to obtain the silicon carbide silk screen corrugated board precursor.
As shown in fig. 1(a) -1 (b), the corrugated plate combining process is as follows: the multi-sheet corrugated plate precursor is stacked and bonded into a plate block, corrugated plates in the plate block are vertically arranged, the plate layers are stacked in parallel, the corrugated parallel direction and the vertical direction have an inclination angle theta, the inclination angle theta is 15-85 degrees (60 degrees in the embodiment), the inclination angles of adjacent corrugated plates are the same, the directions are opposite, and contact points between two adjacent corrugated plates are bonding points.
And then degreasing, wherein in the embodiment, the degreasing process comprises the following steps:
and heating the combined and bonded medium material disc to 800 ℃ under the protective atmosphere of argon, preserving the heat for 1 hour at the heating rate of 5 ℃ per minute, and generating a carbonaceous silk screen corrugated medium material disc (block).
In this embodiment, the sintering process includes:
and (3) carrying out reactive infiltration sintering on the carbon wire mesh corrugated medium material disc (block) obtained by degreasing, wherein the raw material selected in the infiltration reactive sintering is silicon, the sintering is carried out under the vacuum condition, the heating rate is 15 ℃ per minute, the melt temperature is 1600 ℃, and the heat preservation is carried out for 1 hour to obtain the silicon carbide wire mesh corrugated medium material block.
In this embodiment (1), the obtained silicon carbide mesh corrugated medium material disc (block) is formed by stacking and combining silicon carbide mesh corrugated plates with corrugated geometric shapes, each corrugated plate is a silicon carbide mesh with a network structure, and the corrugated shape of each corrugated plate is triangular. The specific parameters are shown in Table 1.
(2) Silicon nitride material silk screen corrugated medium material:
the mass ratio is 85%: 10%: 5% of silicon nitride powder with the average particle size of 5 mu m, 1 mu m of yttrium oxide powder and PVA are blended in distilled water, and are subjected to mechanical stirring, ball milling and filtering to obtain slurry, wherein the solid content of the slurry solution is 85% of the total mass. The raw material is uniformly sprayed on a nylon wire mesh with 20 meshes and quadrilateral meshes, and the areal density is controlled to be 0.03g/cm2Spreading the coated wire mesh on one surface of a split mold heated to 160 ℃ and provided with triangular grooves, closing the mold and pressurizing to a limiting position, limiting the position between the molds to ensure that a gap is 0.5mm, keeping the temperature for 20 seconds and then shaping, or extruding and curing the coated wire mesh between double rollers to form the wire mesh with the same corrugated shape as the double-roller mold, spraying the obtained wire mesh corrugated plate to the surface of the split mold again after opening the moldCertain surface density is controlled at 0.1g/cm2But the silicon nitride wire mesh corrugated plate precursor is obtained by ensuring that the wire mesh pore canal is opened and drying at 160 ℃.
As shown in fig. 1(a) -1 (b), the media material disc is prepared as follows: the same slurry of multi-sheet corrugated plate precursor is overlapped and bonded into a plate block, the corrugated plates in the plate block are vertically arranged, the plates are mutually overlapped in parallel, the parallel direction of the corrugated plates and the vertical direction have an inclination angle theta, the inclination angle of each adjacent corrugated plate is the same between 15 degrees and 85 degrees (70 degrees in the embodiment), the directions are opposite, and the contact points between the two adjacent corrugated plates are bonding points.
And then sintering, wherein in the embodiment, the sintering process comprises the following steps:
and heating the combined and bonded medium material disc to 1800 ℃ in a nitrogen atmosphere, and then preserving the heat for 1.5 hours at a heating rate of 5 ℃ per minute to obtain the silicon nitride screen corrugated medium material disc.
In this embodiment (2), the obtained silicon nitride mesh porous medium material is formed by overlapping and combining silicon nitride mesh corrugated plates with corrugated geometric shapes, and the corrugated shapes of the corrugated plates are triangular. The specific parameters are shown in Table 1.
TABLE 1 geometric characteristics data of two ceramic wire mesh corrugated medium materials
As shown in fig. 2(a) -2 (b), the invention provides a wire mesh type structure of ceramic wire mesh corrugated dielectric material with high thermal shock resistance. When the mesh hole type structure is round, the function is as follows: the round hole shape is beneficial to the homogenization of thermal stress in use, and the stress is not easy to be inoculated at certain nodes, so that the service reliability of the material is higher; when the mesh hole type structure is oval, the effect is similar to that of a round hole, and the problem of stress concentration can be relieved.
As shown in fig. 3(a) -3 (c), the ceramic wire mesh corrugated dielectric material of the present invention has a wire mesh type structure-a regular polygonal structure with high thermal shock resistance. When the mesh hole type structure is a trilateral shape, the function is as follows: the triangle has the best space stability, and the basic mechanical property of the material can be improved; when the mesh hole type structure is quadrilateral, the quadrilateral hole type organic template mesh is easy to weave and has wider sources; when the hole pattern structure of the silk screen is regular hexagon, the hexagonal hole pattern organic template silk screen is easier to weave and has wider source; the two screen hole patterns can form smooth transition at the node through slurry coating, and can also prevent stress from concentrating at the node, thereby being beneficial to improving thermal shock resistance.
As shown in fig. 4(a) -4 (c), the corrugated shape S of the corrugated sheet in the ceramic wire mesh corrugated medium material with high thermal shock resistance of the present invention is a kind. Wherein, fig. 4(a) is a triangular corrugation, H represents the peak height, the peak height (H) can be between 3-20 mm, α represents the corrugation angle, l represents the wave distance, and the function is: the triangular pore channel structure is beneficial to space stability and easy for mold preparation; fig. 4(b) and 4(c) are top smooth triangle and sine wave pore channel structures, respectively, H represents the peak height, α represents the ripple angle, the ripple angle α can be 30-150 °, if the ripple shape is smooth wave, the ripple angle α is calculated by the connecting line included angle of the top of the adjacent peak, l represents the wave distance, and the function is: the smooth pore canal structure is beneficial to ensuring that the thermal stress distribution is more uniform, the thermal stress is not easy to concentrate among corrugated sheets, and the thermal shock resistance of the material can be improved.
As shown in fig. 5, a physical diagram of a circular plate made of the ceramic wire mesh corrugated medium material with high thermal shock resistance (the diameter of the wire mesh is 30 meshes, and the material is silicon nitride) of the invention shows that: the whole disk of the medium material has a good space structure, the shape of the template is kept outside the meshes inside the corrugated sheets, the acute angle at the node is eliminated through coating, and the pore channels formed by combining the corrugated sheets can play a role in reducing air resistance, thereby being beneficial to the combustion organization and the heat transfer and exchange in the porous medium combustion application.
As shown in fig. 6(a) -6 (b), the ceramic wire mesh corrugated medium material with high thermal shock resistance of the invention (the wire mesh has a pore diameter of 10 meshes and is made of silicon-infiltrated silicon carbide), it can be seen that the whole disc of the medium material has a good space structure, the shape of the template is kept outside the meshes inside the corrugated sheets, and the hollow ribs are smooth and compact after coating, so that the pore channels formed by combining the corrugated sheets can play a role in reducing air resistance, and the combustion organization and the heat transfer-heat exchange in the porous medium combustion application are facilitated.
Example 2 application test in porous Medium Combustion
The two ceramic wire mesh corrugated medium materials with high thermal shock resistance and the ceramic foam with the same volume fraction are subjected to a comparative combustion experiment on a porous medium combustion experiment device, the gas flow and the air-fuel ratio adopted in the experiments of the four materials are the same, the experiments are ensured to be carried out under the same working condition, and further the thermal shock resistance and the application performance of the four materials are compared, and specific results are shown in table 2.
TABLE 2 comparison of theoretical plate number of ceramic wire mesh corrugated structured media material with BX wire mesh media material
Example 3 application test in solar thermal absorber
The specific results of table 3 show that the two ceramic wire mesh corrugated medium materials with high thermal shock resistance provided by the invention have a straight-through pore channel structure, so that the air flow resistance is low, the fan power consumption is greatly reduced, the obtained hot air temperature is higher, the power density is higher, the thermal shock resistance is stronger, and the good use effect of the ceramic wire mesh corrugated medium material is shown.
TABLE 3 test data of ceramic wire mesh corrugated medium material in 20KW/h multi-butterfly solar air heat absorber
The embodiment shows that the ceramic wire mesh corrugated medium material provided by the invention is formed by overlapping and combining the ceramic wire mesh corrugated plates with the corrugated geometric shapes, well maintains the network characteristics of an organic wire mesh, has the characteristics of large specific surface area, controllable structure and good thermal shock resistance, has a good application effect in porous medium combustion and solar air heat absorbers, and has a good market prospect. The ceramic wire mesh corrugated medium material with high thermal shock resistance can be used as a porous medium combustion and solar air thermal power generation medium, and has a good use effect especially under working conditions of high power density, large thermal shock and large thermal stress caused by uneven temperature field.
Claims (10)
1. The ceramic wire mesh corrugated medium material with high thermal shock resistance is characterized in that the ceramic wire mesh corrugated medium material is basically composed of a corrugated ceramic wire mesh material, the wire mesh material contains a ceramic material and wire mesh wires with adjustable structures, the wire mesh wires form wire mesh holes with adjustable hole patterns, a single layer or more than two layers of ceramic wire mesh corrugated medium material plates are superposed to form the ceramic wire mesh corrugated medium material with a through hole structure, and the ceramic material, the wire mesh wires and the wire mesh hole patterns are the same or different.
2. The ceramic wire mesh corrugated medium material with high thermal shock resistance as claimed in claim 1, wherein the wires contained in the ceramic wire mesh corrugated medium material sheet are of a solid or hollow structure; the screen hole type structure contained in the ceramic screen corrugated medium material sheet is one or more than two of a circular structure, an oval structure, a conventional polygon structure, a variant polygon structure, a graded polygon structure, a chiral structure or an anti-chiral structure; the corrugated shape of the ceramic wire mesh corrugated medium material sheet is one or more than two of the following shapes: triangular, vertex-smooth triangular, square wave, vertex-smooth square wave, trapezoidal wave, vertex-smooth trapezoidal wave, sinusoidal wave.
3. The ceramic wire mesh corrugated medium material with high thermal shock resistance as claimed in claim 1, wherein the superposed ceramic wire mesh corrugated medium material sheets are vertically arranged, and the planes of the wave crests or the wave troughs of each ceramic wire mesh corrugated medium material sheet are parallel to each other; the directions of the wave crest lines or the wave trough lines of the corrugations and the vertical direction have an inclination angle of between 15 and 85 degrees, and the inclination angles of the adjacent corrugated medium material sheets of the ceramic silk screen are the same and are opposite in direction.
4. The ceramic wire mesh corrugated medium material with high thermal shock resistance as claimed in claim 1, wherein the wire mesh aperture of the ceramic wire mesh corrugated medium material sheet is 2-50 mesh, the wire mesh aperture area ratio is 50-95%, and the ceramic material is silicon carbide, silicon nitride, SiAlON (SiAlON) or zirconia.
5. The ceramic wire mesh corrugated medium material with high thermal shock resistance as claimed in claim 1, wherein the corrugated shape of the ceramic wire mesh corrugated medium material sheet is one or more of triangular shape, vertex smooth triangular shape, sine wave waveform and smooth wave shape, the corrugated size and structure are adjustable, the peak height H is between 3 and 20mm, and the corrugated angle alpha is between 30 and 150 degrees; if the corrugation is sine wave or smooth wave, the corrugation angle alpha is calculated by the connecting line included angle of the top points of adjacent wave peaks.
6. The ceramic wire mesh corrugated medium material with high thermal shock resistance as claimed in claim 5, wherein preferably, the peak height H of the ceramic wire mesh corrugated medium material sheet is between 3 and 8mm, and the corrugation angle α is between 60 and 120 °.
7. A preparation method of the ceramic wire mesh corrugated medium material with high thermal shock resistance as recited in any one of claims 1 to 6, characterized by comprising the following steps:
(1) selecting a single layer or more than two layers of organic silk screens as template materials;
(2) uniformly coating ceramic slurry on an organic material wire mesh by adopting a gas spraying, airless spraying or slurry dipping process, then placing the organic material wire mesh on one surface of a heated split forming die, closing the die, heating, curing and forming to obtain the organic material corrugated plate coated with the ceramic slurry; or adopting a heated corrugated pair roller to extrude, solidify and mold the organic material silk screen coated with the ceramic slurry between the pair roller to obtain the organic material corrugated plate coated with the ceramic slurry, wherein the shape of the corrugation is controlled by the shape of the mold according to the actual condition;
(3) recoating
Continuously and repeatedly coating the organic corrugated plate coated with the ceramic slurry obtained in the step (2) by adopting a gas spraying, airless spraying or slurry dipping process, drying by hot air between two adjacent spraying or dipping processes, and specifically setting and adjusting the circulating coating times of the slurry according to different pore diameters and strength requirements to obtain a precursor of the corrugated dielectric material plate of the ceramic silk screen;
(4) the same ceramic slurry is used as a bonding agent, the precursors of the ceramic wire mesh corrugated medium material plate are combined in a parallel overlapping mode, the same ceramic slurry is bonded to form a medium material plate structure, then the medium material plate structure is processed and formed into a required medium material plate shape, and the ceramic wire mesh corrugated medium with high thermal shock resistance is formed through sintering.
8. The method for preparing a ceramic wire mesh corrugated medium material with high thermal shock resistance as claimed in claim 7, wherein in the step (1), the organic material wire mesh used as the template material is one or more of polyethylene, polystyrene, polyurethane, nylon polypropylene and polyvinyl chloride; the mesh pattern of the organic material mesh is one or more than two of a circle, a triangle, a quadrangle and a hexagon.
9. The method for preparing a ceramic wire mesh corrugated medium material with high thermal shock resistance as claimed in claim 7, wherein in the step (4), different sintering methods are adopted in the sintering process according to different ceramic types, the silicon carbide material is sintered by adopting an oxide bonding mode or a siliconizing sintering process, and the silicon nitride, the zirconium oxide or the sialon is sintered by adopting a mode of adding a sintering aid.
10. The application of the ceramic wire mesh corrugated medium material with high thermal shock resistance as claimed in any one of claims 1 to 6, wherein the ceramic wire mesh corrugated medium material is applied to a porous medium burner medium or a solar air heat absorber.
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