CN117486617A - Preparation method and device of porous silicon nitride ceramic - Google Patents
Preparation method and device of porous silicon nitride ceramic Download PDFInfo
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- CN117486617A CN117486617A CN202311286198.XA CN202311286198A CN117486617A CN 117486617 A CN117486617 A CN 117486617A CN 202311286198 A CN202311286198 A CN 202311286198A CN 117486617 A CN117486617 A CN 117486617A
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 238000002360 preparation method Methods 0.000 title claims abstract description 85
- 239000000919 ceramic Substances 0.000 title claims abstract description 83
- 229910021426 porous silicon Inorganic materials 0.000 title claims abstract description 81
- 238000003825 pressing Methods 0.000 claims abstract description 79
- 239000002994 raw material Substances 0.000 claims abstract description 78
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000000498 ball milling Methods 0.000 claims abstract description 32
- 238000005245 sintering Methods 0.000 claims abstract description 27
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000007599 discharging Methods 0.000 claims abstract description 22
- 239000003292 glue Substances 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 238000012216 screening Methods 0.000 claims abstract description 14
- 238000000227 grinding Methods 0.000 claims abstract description 12
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 238000007580 dry-mixing Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 10
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 239000011259 mixed solution Substances 0.000 claims abstract description 5
- 239000004744 fabric Substances 0.000 claims description 24
- 238000007667 floating Methods 0.000 claims description 19
- 239000002002 slurry Substances 0.000 claims description 18
- 238000013329 compounding Methods 0.000 claims description 17
- 238000009434 installation Methods 0.000 claims description 11
- 238000012958 reprocessing Methods 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 6
- 241001330002 Bambuseae Species 0.000 claims description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 238000011068 loading method Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- 230000001629 suppression Effects 0.000 claims 1
- 239000002245 particle Substances 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 241001408630 Chloroclystis Species 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—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
- C04B35/58—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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
- B28B3/021—Ram heads of special form
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/6261—Milling
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
- B02C2023/165—Screen denying egress of oversize material
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
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Abstract
The invention provides a preparation method and a device of porous silicon nitride ceramics, which relate to the technical field of silicon nitride ceramics preparation, and the method comprises the steps of conveying silicon nitride raw materials, binders and sintering aids into a coarse crushing box through a feeding auger according to a certain proportion for preliminary processing of raw materials; conveying the raw materials subjected to preliminary processing into a ball mill for fine ball milling; mixing the qualified raw materials after fine grinding and dry mixing with a mixed solution of water and glycerol to form a processing pug; extruding the processed pug through an extruder, and cutting and pressing the extruded pug through a pressing assembly; and (5) conveying the molding pug into a glue discharging machine for glue discharging, and conveying the molding pug into a sintering furnace for sintering. According to the invention, the raw materials are firstly subjected to preliminary processing and crushing, and then are subjected to ball milling, so that the material state of the raw materials is expanded, the actual ball milling time can be greatly shortened through the step, and the quality of the subsequent finished porous silicon nitride ceramic can be ensured from the source through screening the ball-milled raw materials.
Description
Technical Field
The invention relates to the technical field of preparation of silicon nitride ceramics, in particular to a preparation method and a device of porous silicon nitride ceramics.
Background
The porous silicon nitride ceramic is a ceramic material with high-temperature stability, corrosion resistance and abrasion resistance, and has the characteristics of controllable pore diameter and porosity, high surface area and strong surface chargeability due to a multistage pore structure, so that the porous silicon nitride ceramic is widely applied to the fields of adsorption, separation, catalysis and the like;
the current preparation method of the porous silicon nitride ceramic mainly comprises a controllable sintering method, a pore-forming agent adding method and a carbothermic reduction method, wherein the carbothermic reduction method for preparing the porous silicon nitride ceramic has the following advantages: the porous silicon nitride ceramics can be prepared at relatively low temperature, and has more economical efficiency than the traditional high-temperature synthesis method; the prepared porous silicon nitride ceramic has higher aperture and porosity and large surface area, so that the porous silicon nitride ceramic has wider application in the fields of adsorption, separation and catalysis; the porous silicon nitride ceramic prepared by the carbon reduction method has better electric conductivity and thermal conductivity; the production process is simple, easy to control and suitable for large-scale production;
the existing preparation method for preparing the porous silicon nitride ceramic by adopting the carbon reduction method has the following disadvantages:
(1) The raw materials are not processed and are directly subjected to ball milling, the state of the raw materials is more limited by the operation, the expected ball milling effect can be achieved only by the powdery raw materials, otherwise, the ball milling time is extremely long, and the preparation efficiency of the porous silicon nitride ceramic is seriously slowed down;
(2) In the actual ball milling process, the raw materials with larger particle sizes are poured into the slurry preparation cavity for various reasons, and the quality of the subsequent porous silicon nitride ceramics is greatly reduced by the raw materials.
Disclosure of Invention
The invention provides a preparation method and a device of porous silicon nitride ceramics, which are used for solving the problems that the prior preparation method of porous silicon nitride ceramics is not used for directly ball milling raw materials, the state of the raw materials is more limited by the operation, the expected ball milling effect can be achieved only by powdery raw materials, otherwise, the ball milling time is extremely long, the preparation efficiency of the porous silicon nitride ceramics is seriously slowed down, and in the actual ball milling process, the raw materials with larger particle sizes are poured into a slurry preparation cavity due to various reasons, and the raw materials can greatly reduce at least one technical problem in the quality of the subsequent porous silicon nitride ceramics.
In order to solve the technical problems, the invention discloses a preparation method of porous silicon nitride ceramics, which comprises the following steps:
step one: feeding, namely conveying a silicon nitride raw material, a binder and a sintering aid into a coarse crushing box according to a certain proportion through a feeding auger to perform primary processing on the raw materials;
step two: carrying out fine grinding and dry mixing, conveying the raw materials subjected to preliminary processing into a ball mill for fine ball milling, screening the raw materials with larger diameter particles, and re-feeding the raw materials into a feeding auger;
step three: preparing pug, namely pouring qualified raw materials after fine grinding and dry mixing into a slurry preparation cavity, pumping mixed solution of water and glycerol in a liquid supply tank into the slurry preparation cavity, and uniformly mixing with the raw materials to form processed pug;
step four: extrusion molding, namely extruding the processed pug through an extruder, and cutting and pressing the extruded pug through a pressing assembly to form molded pug;
step five: drying and discharging glue, and conveying the formed pug into a glue discharging machine through an inclined plate for discharging glue;
step six: and sintering, namely conveying the molding pug after the glue discharging into a sintering furnace for sintering, and finally forming the porous silicon nitride ceramic.
Preferably, the dosage ratio of the silicon nitride raw material, the binder and the sintering aid is 34:1:2.
Preferably, the volume ratio of water to glycerol is 3:1, and the volume ratio of the total volume of water to glycerol to the qualified raw materials after dry-mixing by fine grinding is 1:2.
The utility model provides a porous silicon nitride ceramic's preparation facilities, including porous silicon nitride ceramic preparation facilities casing, material loading auger and coarse crushing case are installed on porous silicon nitride ceramic preparation facilities casing, and coarse crushing case installs the material loading auger output, be equipped with feed inlet and feed back mouth on the material loading auger, the ball mill rotates to be connected in porous silicon nitride ceramic preparation facilities casing, the ball mill below is equipped with mud preparation chamber, mud preparation chamber is used for preparing the pug, the pug outlet end communicates with each other with the extruder, the extruder outlet end is equipped with pressing subassembly and swash plate, the swash plate is used for sending the shaping pug to the binder exhauster in, binder exhauster outlet end communicates with each other with the fritter.
Preferably, the ball mill comprises a ball mill shell, the ball mill shell is rotationally connected in the porous silicon nitride ceramic preparation device shell, the inlet end of the ball mill shell is communicated with the outlet end of the coarse crushing box, the ball mill motor is fixedly connected to the porous silicon nitride ceramic preparation device shell, the ball mill gear is fixedly connected to the output end of the ball mill motor, the ball mill shell is fixedly connected with a ball mill toothed ring, the ball mill gear is meshed with the ball mill toothed ring, a plurality of steel balls with different sizes are arranged in the ball mill shell, and a screen is fixedly connected to the ball mill shell.
Preferably, the slurry preparation intracavity is equipped with feed back reprocessing screening component, feed back reprocessing screening component includes electric screen cloth installing frame, electric screen cloth installing frame swivelling joint is on porous silicon nitride ceramic preparation facilities casing, electric screen cloth installing frame internal rotation is connected with electric reel, the guide spout has been seted up in the electric screen cloth installing frame, sliding connection has the screen cloth to connect the piston in the guide spout, the winding has the drive wire on the electric reel, the one end fixed connection that electric reel was kept away from to the drive wire is on screen cloth connecting piston, be connected through first elastic component between screen cloth connecting piston and the guide spout inner wall, screen cloth connecting piston is kept away from the one end fixed connection of drive wire has the screen cloth, be equipped with the guide support spout on the screen cloth, set up feed back piston guide spout in the porous silicon nitride ceramic preparation facilities casing, feed back piston guide spout sliding connection has the feed back piston in the feed back piston, fixedly connected with first electro-magnet on the feed back piston guide spout inner wall fixedly connected with second electro-magnet, pass through second elastic component fixed connection between first electro-magnet and the second electro-magnet, feed back piston keeps away from the one end of feed back piston guide spout and is used for supporting the spout with the guide support spout each other with the second electro-magnet and electric screen cloth installation frame electricity.
Preferably, the preparation chamber lateral wall is equipped with the feed back subassembly, the feed back subassembly is installed in the switch-on intracavity, switch-on chamber both ends communicate with each other with preparation chamber and return port respectively, the feed back subassembly includes the direction slide rail of fixed connection at switch-on chamber both sides wall, rotate on the direction slide rail and be connected with electronic bent lever, electronic bent lever and electric screen cloth installing frame electricity are connected, electronic bent lever one end fixedly connected with third elastic component, the one end fixed connection of electronic bent lever is kept away from to the third elastic component is on the fixed block, electronic bent lever other end hinged joint is on turning over the board door, the one end that the turning over the board door kept away from electronic bent lever rotates and is connected with the gyro wheel, gyro wheel roll connection is on the direction slide rail, switch-on chamber inner wall fixedly connected with trigger piece, switch-on chamber bottom rotation is connected with electric screw, electric screw is connected with the trigger piece electricity, threaded connection has the shift nut on the shift nut, fixedly connected with connects the material swash plate.
Preferably, the thick liquid preparation intracavity is equipped with quick compounding subassembly, quick compounding subassembly includes mount table drive assembly, floating mount table, compounding lead screw and mixing paddle, sliding connection is on porous silicon nitride ceramic preparation facilities casing about the floating mount table, mount table drive assembly is used for driving floating mount table up-and-down motion, fixedly connected with compounding motor on the floating mount table, compounding motor output fixedly connected with compounding lead screw, the compounding paddle includes oar section of thick bamboo and a plurality of electric paddle, oar section of thick bamboo threaded connection is on the compounding lead screw, electric paddle rotates to be connected on oar section of thick bamboo.
Preferably, the mounting table driving assembly comprises an electric driving sliding block, the electric driving sliding block is connected in a porous silicon nitride ceramic preparation device shell in a front-back sliding mode, an S-shaped sliding groove is formed in the electric driving sliding block, a short shaft is connected in the S-shaped sliding groove in a sliding mode and fixedly connected to a mounting seat connecting shaft, the mounting seat connecting shaft is fixedly connected to a floating mounting table, a connecting shaft guide sleeve is fixedly connected to the porous silicon nitride ceramic preparation device shell, the mounting seat connecting shaft is connected in the connecting shaft guide sleeve in a vertically sliding mode, and a fourth elastic piece is sleeved on the mounting seat connecting shaft.
Preferably, the pressing assembly comprises a pressing assembly mounting seat, the pressing assembly mounting seat is fixedly connected to the extruder, an electric pressing screw rod is rotationally connected to the pressing assembly mounting seat, a taper nut is connected to the electric pressing screw rod in a threaded mode, a cutting sheet is connected to the pressing assembly mounting seat in a left-right sliding mode, a fifth elastic piece is sleeved on the cutting sheet, a pressing main body guide cylinder is fixedly connected to the pressing assembly mounting seat, a pressing rod is connected to the pressing main body guide cylinder in a vertical sliding mode, one end of the pressing rod is rotationally connected with a pressing roller, the pressing roller is in rolling connection to the taper nut, a pressing die is connected to the other end of the pressing rod in a threaded mode, and a sixth elastic piece is sleeved on the pressing rod.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the raw materials are firstly subjected to preliminary processing and crushing and then are subjected to ball milling, so that the material state of the raw materials is expanded, the raw materials can be changed into particles or blocks from the original powder, the flexibility of equipment is improved, the actual ball milling time can be greatly shortened through the step, and the quality of the subsequent finished porous silicon nitride ceramics can be ensured from the source through screening the ball-milled raw materials;
2. the design of the feed back component and the feed back reprocessing and screening component enables raw materials with larger grain diameters, which are broken down by steel balls to penetrate through the leakage net or are damaged by the leakage net, to be recycled and reprocessed, so that the fineness of the raw materials of the porous silicon nitride ceramic is greatly ensured, and the processing quality of the porous silicon nitride ceramic is ensured from the source.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a feeding auger according to the present invention;
FIG. 3 is an enlarged schematic view of the area A in FIG. 1 according to the present invention;
FIG. 4 is an enlarged schematic view of the structure of the area C in FIG. 1 according to the present invention;
FIG. 5 is an enlarged schematic view of the structure of the area B in FIG. 1 according to the present invention;
FIG. 6 is a side view of a mounting table drive assembly of the present invention;
fig. 7 is a schematic view of the structure of the pressing assembly of the present invention.
In the figure: 1. feeding auger; 100. a sloping plate; 101. porous silicon nitride ceramic preparation device shell; 102. a feed inlet; 103. a feed back port; 2. a coarse crushing box; 3. ball mill; 400. an electric screen mounting frame; 4000. an electric reel; 4001. a guide chute; 4002. the screen is connected with the piston; 4003. driving the winding wire; 4004. a screen; 4005. a guide support chute; 4006. a return piston guiding chute; 4007. a feed back piston; 4008. a first electromagnet; 4009. a second electromagnet; 401. a second elastic member; 4010. a first elastic member; 4011. the cavity is communicated; 4012. a guide rail; 4013. an electric bent rod; 4014. a third elastic member; 4015. a fixed block; 4016. a flap door; 4017. a roller; 4018. a trigger block; 4019. a material receiving sloping plate; 402. an electric screw; 4020. a displacement nut; 403. a floating mount; 4030. a mixing screw rod; 4031. mixing paddles; 4032. a mixing motor; 4033. a mixing screw rod; 4034. a paddle cylinder; 4035. an electric paddle; 4036. an electrically driven slider; 4037. s-shaped sliding grooves; 4038. a short shaft; 4039. the mounting seat is connected with the shaft; 404. a connecting shaft guide sleeve; 4040. a fourth elastic member; 5. a liquid supply tank; 6. an extruder; 7. a pressing assembly; 700. pressing an assembly mounting seat; 7000. electrically pressing a lead screw; 7001. a cone nut; 7002. cutting the sheet; 7003. a fifth elastic member; 7004. pressing a main body guide cylinder; 7005. pressing a rod; 7006. pressing rollers; 7007. a pressing mold; 7008. a sixth elastic member; 8. a glue discharging machine; 9. and (5) a sintering furnace.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
In addition, the descriptions of the "first," "second," and the like, herein are for descriptive purposes only and are not intended to be specifically construed as order or sequence, nor are they intended to limit the invention solely for distinguishing between components or operations described in the same technical term, but are not to be construed as indicating or implying any relative importance or order of such features. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, technical solutions and technical features between the embodiments may be combined with each other, but it is necessary to base that a person skilled in the art can implement the combination of technical solutions, when the combination of technical solutions contradicts or cannot be implemented, should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present invention.
The invention provides the following examples
Example 1
The embodiment of the invention provides a preparation method and a device of porous silicon nitride ceramics, as shown in figures 1-7, comprising the following steps:
step one: feeding, namely conveying a silicon nitride raw material, a binder and a sintering aid into a coarse crushing box 2 according to a certain proportion through a feeding auger 1 for preliminary processing of raw materials;
step two: carrying out fine grinding and dry mixing, conveying the raw materials subjected to preliminary processing into a ball mill 3 for fine ball milling, screening the raw materials with larger diameter particles, and re-feeding the raw materials into a feeding auger 1;
step three: preparing pug, namely pouring qualified raw materials after fine grinding and dry mixing into a slurry preparation cavity 4, pumping mixed solution of water and glycerol in a liquid supply tank 5 into the slurry preparation cavity 4, and uniformly mixing with the raw materials to form processed pug;
step four: extrusion molding, namely extruding the processed pug through an extruder 6, and cutting and pressing the extruded pug through a pressing assembly 7 to form molded pug;
step five: drying and discharging glue, and conveying the formed pug into a glue discharging machine 8 through an inclined plate 100 for discharging glue;
step six: and (3) sintering, namely conveying the molding pug after the glue discharging into a sintering furnace 9 for sintering, and finally forming the porous silicon nitride ceramic.
Preferably, the dosage ratio of the silicon nitride raw material, the binder and the sintering aid is 34:1:2.
Preferably, the volume ratio of water to glycerol is 3:1, and the volume ratio of the total volume of water to glycerol to the qualified raw materials after dry-mixing by fine grinding is 1:2.
Preferably, the binder is methylcellulose, the sintering aid is yttria, and a graphite crucible coated with boron nitride is adopted during sintering.
Preferably, a hammering component is arranged in the coarse crushing box 2 and is used for carrying out preliminary crushing processing on raw materials so as to prepare for the subsequent ball milling process.
The working principle and the beneficial effects of the technical scheme are as follows: the raw materials are firstly subjected to preliminary processing and crushing and then are subjected to ball milling, so that the material state of the raw materials is expanded, the raw materials can be changed into powder, granular or block from the original raw materials, the flexibility of equipment is improved, the actual ball milling time can be greatly shortened through the step, and the quality of the subsequent finished porous silicon nitride ceramics can be ensured from the source through screening the ball-milled raw materials;
therefore, the invention solves the problems that the existing preparation method of porous silicon nitride ceramics directly ball-mills raw materials without processing the raw materials, the operation has more limitation on the state of the raw materials, the expected ball-milling effect can be achieved only by the powdery raw materials, otherwise, the ball-milling time is extremely long, the preparation efficiency of the porous silicon nitride ceramics is seriously dragged, and in the actual ball-milling process, the raw materials with larger particle size are poured into a slurry preparation cavity due to various reasons, and the raw materials can greatly reduce at least one technical problem in the quality of the subsequent porous silicon nitride ceramics.
Example 2
On the basis of embodiment 1, the preparation device of porous silicon nitride ceramics comprises a porous silicon nitride ceramics preparation device shell 101, a feeding auger 1 and a coarse crushing box 2 are arranged on the porous silicon nitride ceramics preparation device shell 101, the coarse crushing box 2 is arranged at the output end of the feeding auger 1, a feeding port 102 and a feed back port 103 are arranged on the feeding auger 1, a ball mill 3 is rotationally connected in the porous silicon nitride ceramics preparation device shell 101, a slurry preparation cavity 4 is arranged below the ball mill 3, the slurry preparation cavity 4 is used for preparing pug, the outlet end of the slurry preparation cavity 4 is communicated with an extruder 6, a pressing component 7 and an inclined plate 100 are arranged at the outlet end of the extruder 6, the inclined plate 100 is used for conveying formed pug into a glue discharging machine 8, and the outlet end of the glue discharging machine 8 is communicated with a sintering furnace 9.
The working principle and the beneficial effects of the technical scheme are as follows: the method comprises the steps of inputting silicon nitride raw materials, binders and sintering aids into a feed inlet 102 of a feeding auger 1 according to a certain proportion, conveying the raw materials into a coarse crushing box 2 through the feeding auger 1 for preliminary processing of the raw materials, conveying the raw materials after preliminary processing into a ball mill 3 for fine ball milling, uniformly mixing, pouring the raw materials after fine dry mixing into a slurry preparation cavity 4, pumping a mixed solution of water and glycerol in a liquid supply box 5 into the slurry preparation cavity 4, uniformly mixing the raw materials to form processing pugs, extruding the processing pugs through an extruder 6, cutting and pressing the extruded pugs through a pressing assembly 7 to form molding pugs, conveying the molding pugs into a glue discharging machine 8 through a sloping plate 100 for glue discharging, conveying the molding pugs after glue discharging into a sintering furnace 9 for sintering, and finally forming porous silicon nitride ceramics, wherein a feed back opening 103 is used for feeding the raw materials with unqualified particle sizes into the feeding auger 1 again for reprocessing.
Example 3
Based on embodiment 2, ball mill 3 includes ball mill casing 300, ball mill casing 300 rotates to be connected in porous silicon nitride ceramic preparation facilities casing 101, ball mill casing 300 entrance point communicates with each other with coarse crushing case 2 exit point, fixedly connected with ball mill motor 301 on the porous silicon nitride ceramic preparation facilities casing 101, ball mill motor 301 output fixedly connected with ball mill gear 302, fixedly connected with ball mill ring gear 303 on the ball mill casing 300, ball mill gear 302 and ball mill ring gear 303 intermesh, be equipped with a plurality of not unidimensional steel balls 304 in the ball mill casing 300, fixedly connected with drain screen 305 on the ball mill casing 300.
The working principle and the beneficial effects of the technical scheme are as follows: during operation, the ball milling motor 301 drives the ball milling gear 302 to rotate, the ball milling gear 302 rotates to drive the ball milling toothed ring 303 to rotate, the ball milling toothed ring 303 rotates to drive the ball milling shell 300 to rotate, and the ball milling shell 300 rotates at a certain rotating speed to drive the steel balls 304 in the ball milling shell to do parabolic motion, so that raw materials after preliminary processing are finely ground under the action of the steel balls 304 and are uniformly mixed in the grinding process, and when the particle size of the raw materials is ground to a qualified size, the raw materials can fall into the slurry preparation cavity 4 through the leakage net 305.
Example 4
On the basis of embodiment 2, be equipped with feed back reprocessing screening component in the mud preparation chamber 4, feed back reprocessing screening component includes electric screen installation frame 400, electric screen installation frame 400 swivelling joint is on porous silicon nitride ceramic preparation device casing 101, electric screen installation frame 400 swivelling joint has electric reel 4000, set up the guide chute 4001 in the electric screen installation frame 400, sliding connection has screen connection piston 4002 in the guide chute 4001, the winding has drive wire 4003 on the electric reel 4000, one end fixed connection that drive wire 4003 kept away from electric reel 4000 is on screen connection piston 4002, be connected through first elastic component 4010 between screen connection piston 4002 and the guide chute 4001 inner wall, one end fixed connection that drive wire 4003 was kept away from to screen connection piston 4002 is equipped with screen 4004 on the screen 4004, be equipped with the guide support chute 4005 on the screen 4, set up feed back piston 4006 in the porous silicon nitride ceramic preparation device casing 101, sliding connection has feed back piston 4007 in the guide chute 4006, fixedly connected with first electro-magnet 4008 on the feed back piston 4007, one end fixed connection that drive wire 4003 kept away from electric wire 4002 is on the screen connection piston 4002 is on the first electro-magnet 4006, one end fixed connection electro-magnet 4009 is kept away from with second electro-magnet 4009 through first electro-magnet 4008 and second electro-magnet 400, the second electro-magnet 400 is connected with the first electro-magnet 4009, the second electro-magnet 400 is fixed connection, one end is kept away from the first electro-magnet 4008, and is connected with electro-magnet, and is connected.
The technical scheme has the working principle and beneficial effects that: during operation, the electric reel 4000 reciprocally rotates to drive the driving winding 4003 to pull the screen connecting piston 4002 to reciprocally move, so that the screen 4004 reciprocally moves to screen raw materials after fine ball milling falling on the screen 4004, raw materials with qualified particle sizes fall below the screen 4004 and wait to be stirred and mixed into pugs, raw materials with larger particle sizes are left on the screen 4004, in the process of left and right movement of the screen 4004, the first electromagnet 4008 and the second electromagnet 4009 are in a power-off state, and the guide supporting chute 4005 is in sliding fit with the feed-back piston 4007.
Example 5
On the basis of embodiment 2, a material return component is arranged on the side wall of a preparation cavity 4, the material return component is arranged in a connection cavity 4011, two ends of the connection cavity 4011 are respectively communicated with the preparation cavity 4 and a material return opening 103, the material return component comprises a guide slide rail 4012 fixedly connected to two side walls of the connection cavity 4011, an electric bent rod 4013 is rotatably connected to the guide slide rail 4012, the electric bent rod 4013 is electrically connected with an electric screen mounting frame 400, one end of the electric bent rod 4013 is fixedly connected with a third elastic piece 4014, one end of the third elastic piece 4014, which is far away from the electric bent rod 4013, is fixedly connected to a fixed block 4015, the other end of the electric bent rod 4013 is hinged to a turning plate door 4016, one end of the turning plate door 4016, which is far away from the electric bent rod 4013, is rotatably connected with a roller 4017, the roller 4017 is rotatably connected to the guide slide rail 4012, the inner wall of the connection cavity 4011 is fixedly connected with a trigger block 4018, the bottom of the connection cavity 4011 is rotatably connected with an electric lead screw 402, the electric lead screw 402 is electrically connected to the trigger block 4018, a shifting nut 4020 is in threaded connection to the electric lead screw 402, and a shifting nut 4020 is fixedly connected to a shifting nut 4019.
The working principle and the beneficial effects of the technical scheme are as follows: the electric screen mounting frame 400 rotates to trigger the electric bent rod 4013 to rotate, the electric bent rod 4013 rotates to drive the flap door 4016 to turn from a vertical state to a horizontal state, in the process of turning the flap door 4016, the roller 4017 slides along the guide slide rail 4012, when the flap door 4016 rotates to the horizontal state, the roller 4017 contacts the trigger block 4018, thereby triggering the electric screw 402 to start working, the electric screw 402 rotates to drive the shift nut 4020 to move under the action of threads, so that the material receiving inclined plate 4019 moves towards the direction close to the preparation cavity 4, meanwhile, the electric screen mounting frame 400 rotates to trigger the first electromagnet 4008 and the second electromagnet 4009 to obtain electricity, so that the material returning piston 4007 moves towards the direction close to the second electromagnet 4009, at the moment, the screen 4004 can smoothly rotate, finally the screen 4004 rotates to be lapped on the material receiving inclined plate 4019, raw materials with larger particle sizes on the screen 4004 can roll onto the material receiving inclined plate 4019 under the action of gravity, and fall into the material feeding auger 1 through the material receiving inclined plate 4019 and the material returning opening 103, rough machining and fine grinding are performed again;
the design of the return material assembly and the return material reprocessing and screening assembly enables the steel balls 304 to drop through the leakage net 305 or the raw materials with larger grain diameters, which penetrate through the leakage net 305 due to the damage of the leakage net 305, to be recovered and reprocessed, so that the fineness of the raw materials of the porous silicon nitride ceramics is greatly ensured, and the processing quality of the porous silicon nitride ceramics is ensured from the source.
Example 6
On the basis of embodiment 2, a rapid mixing component is arranged in the slurry preparation cavity 4, the rapid mixing component comprises a mounting table driving component, a floating mounting table 403, a mixing screw 4030 and a mixing paddle 4031, the floating mounting table 403 is connected to a porous silicon nitride ceramic preparation device shell 101 in a vertical sliding mode, the mounting table driving component is used for driving the floating mounting table 403 to move up and down, a mixing motor 4032 is fixedly connected to the floating mounting table 403, the mixing screw 4033 is fixedly connected to the output end of the mixing motor 4032, the mixing paddle 4031 comprises a paddle cylinder 4034 and a plurality of electric paddles 4035, the paddle cylinder 4034 is connected to the mixing screw 4033 in a threaded mode, and the electric paddles 4035 are connected to the paddle cylinder 4034 in a rotating mode;
the mounting table driving assembly comprises an electric driving sliding block 4036, the electric driving sliding block 4036 is connected in the porous silicon nitride ceramic preparation device shell 101 in a front-back sliding mode, an S-shaped sliding groove 4037 is formed in the electric driving sliding block 4036, a short shaft 4038 is connected in a sliding mode in the S-shaped sliding groove 4037, the short shaft 4038 is fixedly connected to a mounting seat connecting shaft 4039, the mounting seat connecting shaft 4039 is fixedly connected to a floating mounting table 403, a connecting shaft guide sleeve 404 is fixedly connected to the porous silicon nitride ceramic preparation device shell 101, the mounting seat connecting shaft 4039 is connected in the connecting shaft guide sleeve 404 in a vertically sliding mode, and a fourth elastic piece 4040 is sleeved on the mounting seat connecting shaft 4039.
The working principle and the beneficial effects of the technical scheme are as follows: when the device works, the mounting table driving assembly drives the floating mounting table 403 to move up and down, the floating mounting table 403 moves up and down to drive the mixing paddles 4031 to move up and down, meanwhile, the mixing motor 4032 drives the mixing screw 4033 to rotate, the mixing screw 4033 rotates to drive the paddle cylinder 4034 to move left and right along the mixing screw 4033, and meanwhile, the plurality of electric paddles 4035 rotate, so that mixing efficiency is improved, and meanwhile, when the screen 4004 is used for pouring, the paddle cylinder 4034 can move left to realize recycling of the paddle cylinder 4034, and interference to movement of the screen 4004 is avoided;
when the mounting table driving assembly works, the electric driving sliding block 4036 slides forwards and backwards, the mounting seat connecting shaft 4039 is driven to move up and down under the action of the S-shaped sliding groove 4037, the mounting seat connecting shaft 4039 moves up and down to drive the floating mounting table 403 to move up and down, the connecting shaft guide sleeve 404 plays a guiding role in the process of the up and down movement of the mounting seat connecting shaft 4039, and meanwhile the short shaft 4038 slides along the S-shaped sliding groove 4037.
Example 7
On the basis of embodiment 2, the pressing assembly 7 comprises a pressing assembly mounting seat 700, the pressing assembly mounting seat 700 is fixedly connected to the extruder 6, an electric pressing screw 7000 is rotationally connected to the pressing assembly mounting seat 700, a taper nut 7001 is connected to the electric pressing screw 7000 in a threaded manner, a cutting sheet 7002 is connected to the pressing assembly mounting seat 700 in a left-right sliding manner, a fifth elastic piece 7003 is sleeved on the cutting sheet 7002, a pressing main body guide cylinder 7004 is fixedly connected to the pressing assembly mounting seat 700, a pressing rod 7005 is connected to the pressing main body guide cylinder 7004 in a vertical sliding manner, one end of the pressing rod 7005 is rotationally connected with a pressing roller 7006, the pressing roller 7006 is in rolling connection to the taper nut 7001, a pressing die 7007 is connected to the other end of the pressing rod 7005 in a threaded manner, and a sixth elastic piece 7008 is sleeved on the pressing rod 7005.
The working principle and the beneficial effects of the technical scheme are as follows: during operation, the electric pressing screw 7000 is in reciprocating positive and negative rotation to drive the conical nut 7001 to reciprocate left and right, the conical nut 7001 is in left and right movement to drive the pressing rod 7005 to move up and down, the pressing rod 7005 moves up and down to press the pug falling on the inclined plate 100, meanwhile, the reciprocating left and right movement of the conical nut 7001 is used for intermittently cutting and pressing the pug at the outlet of the extruder 6, the cutting and pressing are matched with each other, so that the processing efficiency of the pug is accelerated, meanwhile, the pressing die 7007 is in threaded connection with the pressing rod 7005, the shape and the size of the pressing die 7007 can be better according to actual production requirements, and the application flexibility of the porous silicon nitride ceramic preparation device is improved.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A preparation method of porous silicon nitride ceramics is characterized in that: the method comprises the following steps:
step one: feeding, namely conveying a silicon nitride raw material, a binder and a sintering aid into a coarse crushing box (2) through a feeding auger (1) according to a certain proportion to perform primary processing of the raw material;
step two: carrying out fine grinding and dry mixing, conveying the raw materials subjected to preliminary processing into a ball mill (3) for fine ball milling, screening the raw materials with larger diameter grains, and re-feeding the raw materials into a feeding auger (1);
step three: preparing pug, namely pouring qualified raw materials after fine grinding and dry mixing into a slurry preparation cavity (4), pumping mixed solution of water and glycerol in a liquid supply tank (5) into the slurry preparation cavity (4), and uniformly mixing with the raw materials to form processed pug;
step four: extrusion molding, namely extruding the processed pug through an extruder (6), and cutting and pressing the extruded pug through a pressing assembly (7) to form molded pug;
step five: drying and discharging glue, and conveying the formed pug into a glue discharging machine (8) through an inclined plate (100) for discharging glue;
step six: and (3) sintering, namely conveying the molding pug after the glue discharging into a sintering furnace (9) for sintering, and finally forming the porous silicon nitride ceramic.
2. The method for preparing porous silicon nitride ceramic according to claim 1, wherein: the dosage ratio of the silicon nitride raw material, the binder and the sintering aid is 34:1:2.
3. The method for preparing porous silicon nitride ceramic according to claim 1, wherein: the volume ratio of water to glycerol is 3:1, and the volume ratio of the total volume of water to glycerol to the qualified raw materials after dry-mixing by fine grinding is 1:2.
4. A device for preparing porous silicon nitride ceramics, which is used for preparing porous silicon nitride ceramics by adopting the preparation method of the porous silicon nitride ceramics according to any one of claims 1 to 3, and is characterized in that: including porous silicon nitride ceramic preparation facilities casing (101), material loading auger (1) and coarse crushing case (2) are installed on porous silicon nitride ceramic preparation facilities casing (101), and coarse crushing case (2) are installed in material loading auger (1) output, be equipped with feed inlet (102) and feed back mouth (103) on material loading auger (1), ball mill (3) rotate and connect in porous silicon nitride ceramic preparation facilities casing (101), ball mill (3) below is equipped with mud preparation chamber (4), mud preparation chamber (4) are used for preparing the pug, mud preparation chamber (4) exit end communicates with each other with extruder (6), extruder (6) exit end is equipped with suppression subassembly (7) and swash plate (100), swash plate (100) are used for sending the shaping pug into in glue discharging machine (8), glue discharging machine (8) exit end communicates with each other with sintering furnace (9).
5. The apparatus for producing a porous silicon nitride ceramic according to claim 4, wherein: the ball mill (3) comprises a ball mill shell (300), the ball mill shell (300) is rotationally connected in a porous silicon nitride ceramic preparation device shell (101), the inlet end of the ball mill shell (300) is communicated with the outlet end of a coarse crushing box (2), a ball mill motor (301) is fixedly connected to the porous silicon nitride ceramic preparation device shell (101), a ball mill gear (302) is fixedly connected to the output end of the ball mill motor (301), a ball mill toothed ring (303) is fixedly connected to the ball mill shell (300), the ball mill gear (302) and the ball mill toothed ring (303) are meshed with each other, a plurality of steel balls (304) with different sizes are arranged in the ball mill shell (300), and a leakage net (305) is fixedly connected to the ball mill shell (300).
6. The apparatus for producing a porous silicon nitride ceramic according to claim 4, wherein: the slurry preparation cavity (4) is internally provided with a feed back reprocessing screening component, the feed back reprocessing screening component comprises an electric screen cloth installation frame (400), the electric screen cloth installation frame (400) is rotationally connected to a porous silicon nitride ceramic preparation device shell (101), a guide chute (4001) is arranged in the electric screen cloth installation frame (400), a screen cloth connection piston (4002) is arranged in the guide chute (4001) in a sliding manner, a driving winding wire (4003) is wound on the electric screen cloth installation frame (4000), one end of the driving winding wire (4003) far away from the electric screen cloth installation frame (4000) is fixedly connected to the screen cloth connection piston (4002), the screen cloth connection piston (4002) is connected with the inner wall of the guide chute (4001) through a first elastic piece (4010), one end of the screen cloth connection piston (4002) far away from the driving winding wire (4003) is fixedly connected with a screen cloth (4004), a guide support chute (4005) is arranged on the screen cloth (4004), a feed back piston guide chute (6) is arranged in the porous silicon nitride ceramic preparation device shell (101), one end of the driving winding wire (4003) far away from the inner wall of the electric screen cloth installation frame (4002) is fixedly connected with a first electromagnet (4008), a feed back piston (4008) is fixedly connected with a feed back piston (4007), the first electromagnet (4008) and the second electromagnet (4009) are fixedly connected through a second elastic piece (401), one end, far away from a return piston guide chute (4006), of a return piston (4007) is used for being matched with the guide support chute (4005), and the first electromagnet (4008) and the second electromagnet (4009) are electrically connected with the electric screen mounting frame (400).
7. The apparatus for producing a porous silicon nitride ceramic according to claim 6, wherein: the preparation chamber (4) lateral wall is equipped with the feed back subassembly, feed back subassembly installs in switch-on chamber (4011), switch-on chamber (4011) both ends communicate with each other with preparation chamber (4) and feed back mouth (103) respectively, the feed back subassembly includes fixed connection at guide rail (4012) of switch-on chamber (4011) both sides wall, rotate on guide rail (4012) and be connected with electronic bent rod (4013), electronic bent rod (4013) are connected with electric screen mounting frame (400), electronic bent rod (4013) one end fixedly connected with third elastic component (4014), electronic bent rod (4013) one end fixed connection is kept away from in fixed block (4015), electronic bent rod (4013) other end hinged joint is on turning over board door (4016), turning over board door (4016) and being kept away from electronic bent rod (3) one end rotation and be connected with gyro wheel (4017), gyro wheel (4017) roll and be connected with on guide rail 4012), switch-on chamber (4011) inner wall fixedly connected with trigger piece (4018), electronic bent rod (4013) one end fixed connection has electric nut (4014), electronic bent rod (4014) is kept away from electronic bent rod (4013) one end hinge joint (4013) one end of electric nut (4010) on the screw nut (4010), electronic nut (4010) is connected with the screw nut (402).
8. The apparatus for producing a porous silicon nitride ceramic according to claim 4, wherein: be equipped with quick compounding subassembly in thick liquid preparation chamber (4), quick compounding subassembly includes mount table drive assembly, floating mount table (403), compounding lead screw (4030) and compounding oar (4031), sliding connection is on porous silicon nitride ceramic preparation facilities casing (101) about floating mount table (403), mount table drive assembly is used for driving floating mount table (403) up-and-down motion, fixedly connected with compounding motor (4032) on floating mount table (403), compounding motor (4032) output fixedly connected with compounding lead screw (4033), compounding oar (4031) include oar section of thick bamboo (4034) and a plurality of electronic paddle (4035), oar section of thick bamboo (4034) threaded connection is on compounding lead screw (4033), electronic paddle (4035) rotate and connect on oar section of thick bamboo (4034).
9. The apparatus for producing a porous silicon nitride ceramic according to claim 8, wherein: the mounting table driving assembly comprises an electric driving sliding block (4036), the electric driving sliding block (4036) is connected in a porous silicon nitride ceramic preparation device shell (101) in a front-back sliding mode, an S-shaped sliding groove (4037) is formed in the electric driving sliding block (4036), a short shaft (4038) is connected in the S-shaped sliding groove (4037) in a sliding mode, the short shaft (4038) is fixedly connected to a mounting seat connecting shaft (4039), the mounting seat connecting shaft (4039) is fixedly connected to a floating mounting table (403), a connecting shaft guide sleeve (404) is fixedly connected to the porous silicon nitride ceramic preparation device shell (101), the mounting seat connecting shaft (4039) is connected in the connecting shaft guide sleeve (404) in a vertically sliding mode, and a fourth elastic piece (4040) is sleeved on the mounting seat connecting shaft (4039).
10. The apparatus for producing a porous silicon nitride ceramic according to claim 4, wherein: the pressing assembly (7) comprises a pressing assembly mounting seat (700), the pressing assembly mounting seat (700) is fixedly connected to an extruder (6), an electric pressing screw (7000) is rotationally connected to the pressing assembly mounting seat (700), a taper nut (7001) is connected to the electric pressing screw (7000) in a threaded mode, a cutting sheet (7002) is connected to the pressing assembly mounting seat (700) in a left-right sliding mode, a fifth elastic piece (7003) is sleeved on the cutting sheet (7002), a pressing main body guide cylinder (7004) is fixedly connected to the pressing assembly mounting seat (700), a pressing rod (7005) is connected to the pressing main body guide cylinder (7004) in a vertically sliding mode, one end of the pressing rod (7005) is rotationally connected to a pressing roller (7006), the pressing roller (7006) is connected to the taper nut (7001) in a rolling mode, a pressing die (7007) is connected to the other end of the pressing rod (7005) in a threaded mode, and a sixth elastic piece (7008) is sleeved on the pressing rod (7005).
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