CN108252163B - Manufacturing equipment and preparation method of rigid heat-insulating tile blank - Google Patents
Manufacturing equipment and preparation method of rigid heat-insulating tile blank Download PDFInfo
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- CN108252163B CN108252163B CN201810123041.8A CN201810123041A CN108252163B CN 108252163 B CN108252163 B CN 108252163B CN 201810123041 A CN201810123041 A CN 201810123041A CN 108252163 B CN108252163 B CN 108252163B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
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- Inorganic Chemistry (AREA)
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Abstract
The invention provides a manufacturing device of a rigid heat-insulating tile blank, which comprises a water tank for containing water; a slurry tank for containing a slurry; the suction filtration tank comprises a bottom plate with filtration pores and a liquid collection part with a liquid outlet, wherein the liquid collection part is positioned below the bottom plate; a water conduit for leading the water pump from the water tank into the slurry tank; and a conduit for guiding the slurry from the slurry tank into the suction filtration tank. The invention also provides a manufacturing method of the rigid heat-insulating tile blank, which is carried out by adopting the manufacturing equipment. The equipment and the method can be used for preparing rough blanks with near net size and uniform density, and have the advantages of less material and waste, easy processing, low cost, good density uniformity, high strength and the like.
Description
Technical Field
The invention relates to the technical field of heat insulation composite materials, in particular to a rigid heat insulation tile blank and a preparation method thereof.
Background
The ceramic fiber rigid heat insulation tile has the advantages of light weight, high temperature resistance, low heat conductivity, good high temperature stability and the like, is a heat protection system with the earliest application and the most flight experience, and is also a heat protection material used by space shuttles most. For future hypersonic aircrafts, the temperature of the large-area windward side of the fuselage reaches 1400 ℃ or higher, and a shape-maintainable ultrahigh-temperature-resistant heat-insulating material is urgently needed. Therefore, the heat insulation tile is currently and in the future mainly studied by the following aspects: (1) the rigid heat insulation tile can bear higher temperature by selecting fibers resistant to higher temperature, optimizing the raw material proportion of the heat insulation tile and the like; (2) the mechanical property and the use stability of the rigid heat insulation tile are improved by various modification modes such as composite aerogel, regular arrangement of fibers and the like; (3) the light porous ceramic ablation-resistant material is prepared by compounding with resin, so that the integration of heat insulation and prevention is achieved.
The process for making rigid insulation tiles generally comprises: mixing a sintering aid, a dispersing agent and the like with the chopped fibers to obtain fiber slurry, then carrying out suction filtration or compression molding to obtain a wet blank, and drying and sintering the wet blank to obtain the ceramic fiber rigid heat insulation tile. However, the present research on rigid insulation tiles mainly focuses on the above aspects, and few researches on the forming process of the rigid insulation tiles are carried out.
However, the rigid heat insulation tile prepared by the traditional method has the problems of more waste materials, difficult processing, high cost, poor density uniformity, low strength and the like.
Disclosure of Invention
In order to solve the above-mentioned problems of the prior art, the present invention provides in a first aspect an apparatus for manufacturing a ceramic fiber rigid insulation tile blank, the apparatus comprising:
A water tank for holding water;
a slurry tank for containing a slurry;
The suction filtration tank comprises a bottom plate with filtration pores and a liquid collection part with a liquid outlet, wherein the liquid collection part is positioned below the bottom plate;
A water conduit for leading the water pump from the water tank into the slurry tank; and
a conduit for conducting slurry from the slurry tank to the suction canister.
In a second aspect, the present invention provides a method for preparing a ceramic fiber rigid heat insulation tile blank, said method being carried out using the apparatus according to the first aspect of the present invention. Preferably, the method comprises the steps of:
(1) Filling deionized water into a water tank, and filling slurry into a slurry tank;
(2) Injecting deionized water into the suction filtration tank until the liquid level of the deionized water is over the filtration mold;
(3) Opening the membrane diffuser to introduce compressed air into the slurry tank; and/or starting the stirrer to stir the slurry in the slurry tank;
(4) Starting a material pumping pump and a liquid pumping pump, controlling the material guiding speed of the material pumping pump to be equal to the liquid discharging speed of the liquid pumping pump, and keeping the liquid level in the suction filtration tank to be higher than the highest point of the filtration mold;
(5) When the slurry liquid level in the slurry tank reaches a preset distance from the bottom of the slurry tank, starting a water suction pump and controlling the water suction speed of the water suction pump to be equal to the material guiding speed and/or the liquid discharging speed, wherein the preset distance is preferably 4 cm-6 cm;
(6) When the liquid in the suction filtration tank is clear, the suction pump and the membrane diffuser and/or the stirrer are closed, the suction pump is closed after all the slurry in the slurry tank is pumped into the suction filtration tank, and the suction pump is closed after all the water in the suction filtration tank is pumped out, so that a wet blank is obtained;
(7) And demolding the wet blank from the filtering mold, and placing the wet blank in a drying device for drying to obtain a ceramic fiber rigid heat insulation tile blank.
the invention has the following beneficial technical effects:
(1) The material and waste materials are less. Because the equipment and the preparation method can ensure that the solid content of the slurry is uniformly settled along the filtering mould, a green body with a near net size can be prepared. Compared with the blank with the upper surface almost being a plane obtained by the traditional suction filtration technology, the invention can adopt obviously less materials to prepare the blank which can be used for processing the heat insulation tile with the same size, and the waste material generated by processing is obviously less.
(2) Easy to process. Because the invention produces a blank with a near net size, compared with the traditional blank with an upper surface plane, the invention has the advantages that the workload of subsequent processing such as cutting, grinding and the like on the blank is much smaller, and the processing difficulty is obviously lower.
(3) the cost is low. Because the raw materials such as fiber price and the like are expensive, the invention can obviously reduce the cost because the rigid heat insulation tile with the same size can be prepared by less materials.
(4) Good density uniformity and high strength. In the suction filtration stage of the slurry with high initial solid content or the suction filtration stage of the slurry with low solid content at the later stage, the rigid heat insulation tile with good density uniformity can be obtained because the invention always keeps the uniformity of the slurry in the slurry tank and simultaneously keeps the equal pressure difference of the upper surface and the lower surface of the filtering mould at each position on the surface in the suction filtration process. Moreover, the density uniformity of the rigid heat insulation tile is good, so that the local positions of the rigid heat insulation tile have basically the same strength, and the weak part caused by the non-uniform density does not exist, so that the whole rigid heat insulation tile has high strength.
drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention.
Fig. 2 is a top view of a hollow fiber membrane diffuser.
fig. 3 is a partially enlarged view of the hollow fibers of the hollow fiber membrane diffuser in fig. 2.
the reference numbers are as follows:
a water tank 1: the water guide pipe 11: a water pump 12, a water inlet valve 13, a water outlet valve 14 and a water nozzle 15;
Slurry tank 2: the material guide pipe 21: a material pumping pump 22, a material inlet valve 23, a material outlet valve 24 and a slurry nozzle 25;
The membrane diffuser 3: gas inlet 31, gas cavity 32, hollow fibers 33 (including hollow fiber wall 331, fiber cavity 332, openings 333), gas bubbles 34;
And (4) pumping and filtering the tank: a liquid collecting part 41 (a liquid discharge pipe 411, a liquid pump 412, a liquid inlet valve 413, a liquid outlet valve 414, a liquid outlet 415), a limiting strip 42 and a bottom plate 43;
and (3) filtering the mold 5: a profiled surface 51, a reinforcing plate 52.
Detailed Description
preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings, but the scope of the present invention is not limited to these specific embodiments.
Referring to fig. 1, a first aspect of the present invention provides an apparatus for manufacturing a ceramic fiber rigid insulation tile blank comprising:
a water tank 1 for containing water;
A slurry tank 2 for containing slurry;
A suction canister 4, said suction canister 4 comprising a bottom plate 43 with filtering holes and a sump 41 with a liquid outlet 415 located below the bottom plate 43;
a water introduction pipe 11 for introducing water from the water tank 1 into the slurry tank 2; and
A conduit 21 for guiding the slurry from the slurry tank 2 into the suction canister 4.
in some preferred embodiments, the apparatus further comprises a drain 411 connected to the liquid outlet 415.
In some preferred embodiments, the apparatus further comprises: a suction pump 12 provided on the water introduction pipe 11 for pumping water from the water tank 1 into the slurry tank 2. It is also preferable that the apparatus further comprises a pumping pump 22 provided on the guide duct 21 for pumping the slurry from the slurry tank 2 into the suction canister 4. Further preferably, the apparatus may further include a suction pump 412 disposed on the drain pipe 411 for suction-filtering from the material in the suction-filtering tank 4.
in some preferred embodiments, the suction pump 12 is provided with a water inlet valve 13 on the water inlet side and/or with a water outlet valve 14 on the water outlet side. It is also preferred that the pump 22 is provided with a feed valve 23 on the feed side and/or with a discharge valve 24 on the outlet side. It is further preferred that the liquid pump 412 is provided with an inlet valve 413 on the inlet side and/or an outlet valve 414 on the outlet side.
the conduit diameter of the water conduit 12, the catheter 22 and/or the drain pipe 412 is not particularly limited in the present invention, and may be, for example, 2 inches (DN 50).
In some preferred embodiments, the bottom of the slurry tank 2 is also provided with a membrane diffuser 3 (shown in fig. 2) for bubbling from the bottom of the slurry tank into the slurry tank 2. The membrane diffuser 3 may be a hollow fiber microfiltration membrane module, and specifically may be a hollow fiber microfiltration membrane module of PVDF (polyvinylidene fluoride), PAN (polyacrylonitrile), PE (polyethylene), PP (polypropylene), PSf (polyethersulfone), or the like. The membrane diffuser may comprise a gas inlet 31, a gas cavity 32 receiving gas from the gas inlet 31, and a plurality of hollow fibers 33 in gas communication with the gas cavity 32, the hollow fibers 33 comprising hollow fiber walls 331, fiber cavities 332 defined by the hollow fiber walls, and a plurality of apertures 333 (shown in fig. 2 and 3) cut in the hollow fiber walls. The pore diameter of the opening 333 may be in a nanometer range, for example, 100 nm to 200 nm, so that fine bubbles can be formed in the bubbling process, and thus, the solid content of the slurry in the slurry tank is not settled and layered, and meanwhile, no obvious disturbance is caused to the slurry, so that the stable flow rate of the slurry in the slurry pumping pipe is realized, and the uniform density of the wet blank is ensured. Compressed air enters the gas cavity 32 from the gas inlet 31 and then enters each hollow fiber 33 and escapes into the slurry tank through the openings 333 to prevent settling and stratification of the slurry solids.
additionally or alternatively, an agitator (not shown) for agitating the slurry in the slurry tank 3 is provided in the slurry tank 3 to prevent sedimentation stratification of the slurry solids.
in some preferred embodiments, a water nozzle 15 is connected to the outlet of the water guide pipe 11. It is also preferable that a slurry spray 25 is connected to an outlet of the guide tube 21. Due to the use of the spray head, water can be uniformly distributed to the slurry tank or the slurry can be uniformly distributed to the suction filtration tank, so that large disturbance is not caused to the flowing state of the slurry in the slurry tank and/or the material in the suction filtration tank, and the density uniformity of the rigid heat insulation tile blank and the final product is ensured.
In some preferred embodiments, the apparatus is also equipped with a filtering mould 5 with filtering holes placed, in operation, on the bottom plate 43 of the suction filtration tank 4. Preferably, the filter mold 5 has a profiled surface 51 and a reinforcing plate 52 at the bottom, in which case a stop strip 42 can be provided on the inner wall of the suction filtration tank 4 near the bottom plate 43, and the reinforcing plate 52 of the suction filtration mold 5 rests on the stop strip 42. The profiled surface 51 of the filtering die 5 may be a hemispherical, conical, semi-cylindrical or other kind of profiled surface of revolution.
In some preferred embodiments, the apparatus further comprises a drying device (not shown) for drying the wet green body obtained by suction filtration, thereby obtaining a dry green body.
In some preferred embodiments, the apparatus further comprises a sintering device for sintering the dry blank of rigid insulating tiles, thereby obtaining rigid insulating tiles.
in a second aspect, the present invention provides a method for preparing a ceramic fiber rigid heat insulation tile blank, said method being carried out using the apparatus according to the first aspect of the present invention.
In some preferred embodiments, the method comprises the steps of:
(1) Deionized water was charged into a water tank and the slurry was charged into a slurry tank.
(2) Deionized water is injected into the suction filtration tank until the liquid level is submerged in the filtration mold to ensure that the pressure differential between the inner and outer surfaces of the filtration mold remains uniform across the surface of the filtration mold.
(3) The membrane diffuser is turned on to admit compressed air into the slurry tank and/or the agitator is turned on to agitate the slurry in the slurry tank to prevent settling and stratification of the slurry solids.
(4) And starting the pumping pump and the liquid pump, controlling the material guiding speed of the pumping pump and the liquid discharging speed of the pumping pump (for example, 0.5m/s) to be equal, and keeping the liquid level in the pumping tank higher than the highest point of the filtering mold so as to further ensure that the pressure difference between the inner surface and the outer surface of the filtering mold is kept consistent on the surface of the filtering mold.
(5) When the slurry liquid level in the slurry tank reaches a preset distance from the bottom of the slurry tank (at the moment, the position of the port of the water pumping pipe in the water tank is lower than the current water level so as not to influence the water pumping), starting the water pumping pump and controlling the water pumping speed of the water pumping pump to be equal to the material guiding speed and/or the liquid discharging speed (for example, 0.5 m/s). Preferably, the predetermined distance is 4cm to 6 cm.
(6) And when the liquid in the suction filtration tank is clear, closing the suction pump and the membrane diffuser and/or the stirrer, closing the suction pump after all the slurry in the slurry tank is pumped into the suction filtration tank, and closing the suction pump after all the water in the suction filtration tank is pumped out, thereby obtaining the wet blank.
(7) And demolding the wet blank from the filtering mold, and placing the wet blank in a drying device for drying to obtain a dry blank of the ceramic fiber rigid heat insulation tile.
During the preparation process, the liquid level of the suction filtration tank is preferably maintained to be higher than the highest point of the filtration mold in the whole filtration process, and the pressure difference between the upper surface and the lower surface of the filtration mold is maintained to be basically equal at all positions on the surface of the filtration mold through liquid sealing, so that the slurry uniformly flows through the filtration mold, and a green body with uniform density is prepared.
In some preferred embodiments, the slurry comprises or consists of: ceramic fiber, additive, pH value regulator and deionized water.
In some more preferred embodiments, the ceramic fibers are chopped fibers and are selected from one or more of the group consisting of quartz fibers, alumina fibers, zirconia fibers, mullite fibers; for example, the ceramic fiber may be 100% quartz fiber, or 78% quartz fiber + 22% alumina fiber, or 85% quartz fiber + 15% mullite fiber. The chopped fibers may have a length of 5mm to 10mm and a diameter of 1 micron to 20 microns.
In some more preferred embodiments, the additive comprises a curing aid and a sintering aid; more preferably, the curing aid is starch and the sintering aid is boron nitride and/or boron carbide.
In some more preferred embodiments, the pH adjusting agent is ammonia water, and the pH of the slurry is adjusted to 9 to 10 using ammonia water. The inventor finds that the pH value of the slurry is adjusted to 9-10, and in the pH value range, the ceramic fibers and additives (usually powder) in the slurry have good suspension property, are not easy to settle and delaminate, and are easy to keep the slurry uniform. Thus, the density of the resulting green body can be kept uniform.
the slurry may have a composition of, for example, 50kg of water +250g of ceramic fibers +5 to 10g of additive powder (e.g., 5g of starch as a curing aid +5g of boron nitride and/or boron carbide as a sintering aid). The pH regulator can be ammonia water, the pH value of the slurry reaches 9-10 through the ammonia water, and solid content of the slurry can be dispersed in a dispersed phase for a long time.
the invention prevents the slurry from settling and layering through a membrane diffuser, a stirrer and/or a pH regulator, reduces large disturbance to the materials in the slurry tank and/or the suction and filtration tank by controlling the size of bubbles and adopting measures such as a water spray head, a slurry spray head and the like, dilutes the slurry with a preset height in the slurry tank at the last stage and performs suction filtration through the matching use of the suction and filtration tank and the slurry tank and the suction and filtration tank, and keeps the liquid level of the suction and filtration tank higher than the highest point of a filtration mold in the process of settling the solid content of the slurry to the filtration mold, thereby ensuring the density uniformity and near-size molding of the obtained green body.
Examples
The process of the present invention for making ceramic fiber rigid insulation tiles using the apparatus will be further illustrated below in the form of examples, but the scope of the present invention is not limited to these examples.
Example 1
The embodiment is performed by using the equipment shown in fig. 1 to 3, and the specific process is as follows:
Preheating each pump in advance and keeping the pumps in a preparation state; filling deionized water into a water tank; injecting slurry into the slurry tank, wherein the slurry comprises the following components: 50kg of water +250g of chopped quartz fibres +5g of starch +5g of boron carbide, wherein the chopped fibres have a length of about 8mm and a diameter of about 10 microns; adjusting the pH of the slurry to a pH of 9 using ammonia; and (3) putting the semi-cylindrical special-shaped surface filtering die with the length of 400mm and the diameter of 300mm into a suction filtration tank, and injecting deionized water into the suction filtration tank, so that the liquid level is over the highest point of the special-shaped surface suction filtration tool.
Secondly, the membrane diffuser is started, compressed air is introduced, and sedimentation and layering of fibers in the slurry tank are prevented.
And thirdly, starting the material pumping pump to pump the slurry into the suction filtration tank. And simultaneously, starting a liquid pump to perform suction filtration.
Maintaining filtration and controlling the flow rate of the material pumping pump to be equal to that of the liquid pumping pump.
And fifthly, when the slurry level in the slurry tank is 5cm away from the bottom of the tank, turning on a water suction pump, and injecting deionized water into the slurry tank. And controlling the flow rates of the water suction pump, the liquid suction pump and the material suction pump to be equal.
And the water spray heads above the slurry tank and the slurry spray heads above the suction filtration tank are used for uniformly spraying the slurry into the slurry tank and the suction filtration tank when the slurry flows out from the outlet of the pump, so that the flowing state of the slurry in the tank is not greatly disturbed, and the density uniformity of the suction filtration product is improved.
And seventhly, in the whole suction filtration process, the liquid level of the suction filtration tank is required to be kept higher than the highest point of the filtration mold, and the pressure difference between the front side and the back side at different heights of the filtration mold is kept to be basically equal through liquid sealing, so that the slurry uniformly flows through the filtration mold, and a blank body with uniform density is prepared.
And after continuously performing suction filtration for a period of time, observing the liquid in the suction filtration tank by naked eyes, when the liquid is basically clear, namely the fibers are basically sucked and filtered onto the surface of the filtration mold, closing the water suction pump, closing the membrane diffuser, and closing the material suction pump after all the slurry in the slurry tank is pumped. And maintaining the starting state of the liquid pump until all water in the suction filtration tank is pumped out, and closing the liquid pump to obtain the wet blank.
Ninthly, releasing the wet blank prepared in the step eight from the filtering mould, positioning on a positioning tool, and then placing the wet blank into a baking oven to bake for 24 hours at 150 ℃ to obtain a dry blank.
And (c) sintering the dry blank at 1260 ℃ for 5 hours to obtain a rough blank, and machining the rough blank according to the designed shape to obtain the final product, namely the ceramic fiber rigid heat insulation tile.
Example 2
a ceramic fiber rigid thermal insulation tile was prepared in substantially the same manner as in example 1, except that the chopped quartz fiber was replaced with a fiber mixture having a composition of 78% quartz fiber + 22% alumina fiber, boron nitride was used instead of boron carbide, and the pH was adjusted to 10 using ammonia water.
Example 3
A ceramic fiber rigid insulation tile was prepared in substantially the same manner as in example 1, except that the chopped quartz fibers were replaced with a fiber mixture having a composition of 85% quartz fibers + 15% mullite fibers.
Example 4
A ceramic fiber rigid insulation tile was prepared in substantially the same manner as in example 1, except that no pH adjustment was performed and the pH of the resulting slurry was 6.2.
Table 1 below is the distance of the water/fiber interface from the head level of the slurry tank for the slurries used in examples 1 and 4 at different resting times.
Example 5
The wet blank is prepared in a conventional manner, i.e. the slurry is poured into a suction filtration tank for suction filtration. Subsequent drying and sintering were carried out in the same manner as in example 1.
Table 2 quality and uniformity of the insulation tiles produced in the different examples.
The method for testing the utilization rate of the raw materials comprises the following steps: rigid insulation tile weight/weight of fiber in the slurry x 100%.
the material density uniformity test method is as follows: a cube with a side length of 20cm is cut from a rigid heat insulation tile, a cube block with a side length of 2cm is taken at the central surface position of six faces of the cube, and then weighing is carried out to calculate the density and Standard Deviation (SD).
the foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. A method for preparing a ceramic fiber rigid heat insulation tile blank is characterized in that the method adopts equipment comprising the following steps:
A water tank for holding water; a slurry tank for containing a slurry; the suction filtration tank comprises a bottom plate with filtration pores and a liquid collection part with a liquid outlet, wherein the liquid collection part is positioned below the bottom plate; a water conduit for guiding water from the water tank into the slurry tank; a guide pipe for guiding the slurry from the slurry tank into the suction filtration tank; a liquid discharge pipe connected with the liquid outlet; the water pump is arranged on the water guide pipe and used for pumping water from the water tank to the slurry tank; the pumping pump is arranged on the material guide pipe and used for pumping the slurry from the slurry tank to the suction filtration tank; the liquid pump is arranged on the liquid discharge pipe and is used for performing suction filtration on the material in the suction filtration tank; the filtering mould with filtering holes is placed on a bottom plate of the suction filtration tank during working; and a drying device; the system comprises a slurry tank, a membrane diffuser and a stirrer, wherein the membrane diffuser is used for bubbling from the bottom of the slurry tank into the slurry tank, and/or the stirrer is used for stirring slurry in the slurry tank;
the method comprises the following steps:
(1) Filling deionized water into a water tank, and filling slurry into a slurry tank;
(2) injecting deionized water into the suction filtration tank until the liquid level of the deionized water is over the filtration mold;
(3) Opening the membrane diffuser to introduce compressed air into the slurry tank; and/or starting the stirrer to stir the slurry in the slurry tank;
(4) Starting a material pumping pump and a liquid pumping pump, controlling the material guiding speed of the material pumping pump to be equal to the liquid discharging speed of the liquid pumping pump, and keeping the liquid level in the suction filtration tank to be higher than the highest point of the filtration mold;
(5) When the slurry liquid level in the slurry tank reaches a preset distance from the bottom of the slurry tank, starting a water suction pump and controlling the water suction speed of the water suction pump to be equal to the material guiding speed and/or the liquid discharging speed;
(6) when the liquid in the suction filtration tank is clear, the suction pump and the membrane diffuser and/or the stirrer are closed, the suction pump is closed after all the slurry in the slurry tank is pumped into the suction filtration tank, and the suction pump is closed after all the water in the suction filtration tank is pumped out, so that a wet blank is obtained;
(7) and demolding the wet blank from the filtering mold, and placing the wet blank in a drying device for drying to obtain a ceramic fiber rigid heat insulation tile blank.
2. The method according to claim 1, characterized in that the slurry comprises or consists of: ceramic fiber, additive, pH value regulator and deionized water.
3. The method of claim 2, wherein the ceramic fibers are chopped fibers and are selected from one or more of the group consisting of quartz fibers, alumina fibers, zirconia fibers, mullite fibers.
4. The method of claim 2, wherein the additive comprises a curing aid and a sintering aid.
5. The method of claim 4, wherein the curing aid is starch and the sintering aid is boron nitride and/or boron carbide.
6. The method according to claim 2, wherein the pH adjusting agent is ammonia water, and the pH of the slurry is adjusted to 9 to 10 using ammonia water.
7. Method according to claim 1, characterized in that the suction pump is provided with an inlet valve on the inlet side and/or with an outlet valve on the outlet side;
the material pumping pump is provided with a material inlet valve on the material inlet side and/or a material outlet valve on the outlet side; and/or
The liquid pump is provided with a liquid inlet valve on the liquid inlet side and/or a liquid outlet valve on the liquid outlet side.
8. The method of claim 1, wherein a spray head is connected to an outlet of the water guide pipe; and/or
And the outlet of the material guide pipe is connected with a spray head.
9. The method of claim 1, wherein the filtration mold is a contoured face filtration mold.
10. The method according to claim 1, wherein in step (5), the predetermined distance is 4cm to 6 cm.
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| CN201810123041.8A CN108252163B (en) | 2018-02-07 | 2018-02-07 | Manufacturing equipment and preparation method of rigid heat-insulating tile blank |
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| CN201810123041.8A CN108252163B (en) | 2018-02-07 | 2018-02-07 | Manufacturing equipment and preparation method of rigid heat-insulating tile blank |
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| US3952083A (en) * | 1973-12-26 | 1976-04-20 | Nasa | Silica reusable surface insulation |
| US6613255B2 (en) * | 2001-04-13 | 2003-09-02 | The Boeing Company | Method of making a permeable ceramic tile insulation |
| CN102199042A (en) * | 2011-03-28 | 2011-09-28 | 航天材料及工艺研究所 | Lightweight rigid ceramic heat-insulation tile and manufacture method thereof |
| CN104892014B (en) * | 2015-05-25 | 2017-05-24 | 哈尔滨工业大学 | Preparation method of 1200 DEG C resistant lightweight rigid ceramic fiber insulation tile |
| CN105272322B (en) * | 2015-09-30 | 2017-08-25 | 航天特种材料及工艺技术研究所 | A kind of rigid thermal insulation tile of lightening fire resistant ceramic fibre and its manufacture method |
| CN105565845A (en) * | 2015-12-14 | 2016-05-11 | 天津大学 | Preparation method for porous ceramic fiber heat-insulation tile |
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