CN111306940A - Boron carbide ceramic pressureless sintering process and device - Google Patents
Boron carbide ceramic pressureless sintering process and device Download PDFInfo
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- CN111306940A CN111306940A CN202010168993.9A CN202010168993A CN111306940A CN 111306940 A CN111306940 A CN 111306940A CN 202010168993 A CN202010168993 A CN 202010168993A CN 111306940 A CN111306940 A CN 111306940A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—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
- C04B35/56—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 carbides or oxycarbides
- C04B35/563—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 carbides or oxycarbides based on boron carbide
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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
- C04B35/64—Burning or sintering processes
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
- C04B2235/668—Pressureless sintering
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Abstract
The invention discloses a boron carbide ceramic pressureless sintering process and a device, which comprises a sintering mold, wherein a plurality of inserting pipe assemblies are arranged in the sintering mold, and auxiliary agent adding assemblies for injecting and introducing sintering auxiliary agents are arranged outside the inserting pipe assemblies.
Description
Technical Field
The invention relates to the technical field of boron carbide ceramic production, in particular to a boron carbide ceramic pressureless sintering process and a boron carbide ceramic pressureless sintering device.
Background
The boron carbide pressureless sintering process is that boron carbide powder is made into granules through pulping and spray drying, then is pressed into a green body by a steel die and is put into a furnace, the whole process is sintered to 2200 ℃ in vacuum, and then the temperature is kept for 60 minutes; then cooling and discharging the product, wherein the whole process takes 30 hours. The pressureless sintering process achieves the densification requirement by the omnibearing shrinkage of a blank body at high temperature, and has the following advantages that 1, the shape of a product produced by the pressureless sintering process is determined by the shape of the blank body (formed by pressing by a steel die), so that products with various shapes can be produced; 2. a graphite die is not needed in the furnace, so that the amount of the packed product is large (10-15 times of the amount of the hot-pressing sintering process); 3. the consumption of the graphite mould is reduced; 4. because the output of a single furnace is large, the energy consumption of a single product is greatly reduced.
The boron carbide powder has the advantages that the crystal growth is fast at high temperature, the particles become coarse, the blank body is not ready to shrink, and the particles are coarse, so that the boron carbide is difficult to compact through pressureless sintering. The activity of boron carbide particles in the sintering process is promoted by adding sintering aids (such as carbon, aluminum, iron, boron and the like, and also titanium carbide, silicon carbide, titanium boride and the like), the particles are fused together to realize densification under high-temperature vacuum, but the sintering aids are easy to have the phenomenon of uneven distribution when added, the distribution area of the sintering aids is uncontrollable, and the densification of all the parts of the sintering aids is different, so that a non-pressure sintering process and a device for the boron carbide ceramic are provided.
Disclosure of Invention
The invention aims to provide a boron carbide ceramic pressureless sintering process and a boron carbide ceramic pressureless sintering device with controllable and uniformly distributed additives, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a boron carbide pottery non-pressure sintering device, includes the sintering mould, install a plurality of intubate subassemblies in the sintering mould, and the intubate subassembly outside is equipped with and is used for sintering auxiliary agent to annotate leading-in auxiliary agent and adds the subassembly, realizes through the intubate subassembly that auxiliary agent evenly distributed is in the sintering mould to add the subassembly through the auxiliary agent, make the injection of levels such as auxiliary agent, thereby make the auxiliary agent in the mould distribute more evenly, and the distribution of auxiliary agent is controllable.
Preferably, the intubate subassembly includes the locating plate, locating plate and sintering mould looks adaptation to the joint is in sintering mould both sides, a plurality of injection outer tubes are installed to the equidistance on the locating plate, and the equal sliding sleeve in the injection outer tube has the injection inner tube, the through-hole has all been opened in the injection outer tube and the injection inner tube outside to add the subassembly through the through-hole and be connected, through the injection inner tube in the intubate subassembly with inject the outer tube to the cooperation, realize opening to injecting into the outer tube through-hole, thereby realize adding the subassembly with the auxiliary agent and be connected.
Preferably, the auxiliary agent adding assembly comprises a supporting plate and a pushing plate, a plurality of adding parts are fixed on the bottom plate, a moving plate is fixed at the outer ends of the adding parts, the pushing plate is connected with the tail ends of the adding parts, and the auxiliary agent in the adding parts is added into the injection inner tube under the matching action of the supporting plate, the pushing plate and the moving plate.
Preferably, add the piece including adding the outer tube and promoting the piston rod, it is fixed with the butt plate to add the outer tube, and adds the outer tube and sliding insert and have adding the inner tube, it is fixed with the movable plate to add the inner tube outer wall, it is intraductal that the promotion piston rod is located to add, and it is fixed with the propulsion plate to promote the piston rod tail end, through adding the cooperation action of adding the outer tube and adding the inner tube in the piece, realizes pushing adding the interior auxiliary agent of inner tube.
Preferably, the top of the intubation tube assembly is provided with an insertion piston rod corresponding to the position of the injection outer tube, the top of the insertion piston rod is fixed with a pressing plate, the insertion piston rod is inserted to abut against the boron carbide particles and the auxiliary agent injected into the inner tube, the intubation tube assembly is pulled out, and the boron carbide particles and the auxiliary agent are left in the mold.
Preferably, the end, close to the propulsion plate, of the adding inner tube is communicated with a feeding cavity, the top of the feeding cavity is provided with a feeding port, and after the additive in the adding inner tube is added, the additive is supplemented through the feeding port.
Preferably, the abutting plate is an arc-shaped plate matched with the injection outer pipe, an arc-shaped opening is formed in the inner side of the moving plate, the outer diameter of the addition outer pipe is consistent with the inner diameter of the through hole, the abutting plate is in an arc-shaped plate shape, so that the abutting plate is contacted with the injection outer pipe more stably, and the moving plate can move more conveniently due to the arc-shaped opening.
Preferably, a pulling plate is fixed on the outer side of the top end of the injection inner tube, so that the injection inner tube can be conveniently pulled and moved.
Preferably, the boron carbide ceramic pressureless sintering process comprises the following steps;
s1, firstly, mounting a group of cannula components on a sintering mould, and then, granulating boron carbide powder and pouring the granulated boron carbide powder into an inner tube;
s2, holding the filled auxiliary agent adding assembly by hand, aligning the adding outer pipes of the three adding frames with the through holes, aligning the through holes in the injecting inner pipe with the through holes in the injecting outer pipe by lifting the injecting inner pipe, and inserting the adding outer pipe until the bottom plate is contacted with the outer wall of the injecting outer pipe;
s3, the hand butts against the pushing plate, the moving plate is pulled backwards, the adding inner tube is drawn out, so that the auxiliary agent is left in the adding outer tube, and finally the adding outer tube is slowly drawn out, so that the auxiliary agent is left in the injecting inner tube in an equal layer;
s4, circulating the steps S1-S3 for multiple times until multiple groups of cannula assemblies are uniformly arranged in the sintering mold;
s5, after a plurality of groups of filled inserting pipe assemblies are uniformly arranged in the sintering mold, the boron carbide powder is granulated and guided into the sintering mold and filled with the boron carbide powder, the inserting pipe assemblies are drawn out by pinching the positioning plate, so that the additives injected in an equal layer are remained in the sintering mold, and the pressed green body is pressed by the pressing of the upper mold, and the control of uniformly injecting the additives is realized by adjusting the positions of the plurality of groups of inserting assemblies.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the pipe inserting assemblies are uniformly distributed in the sintering mould, and the sintering auxiliary agents are uniformly injected into the injection inner pipe at equal levels through the matching action of the auxiliary agent adding assemblies, so that the sintering auxiliary agents can be uniformly distributed on different levels, and the sintering auxiliary agents are uniformly distributed in the sintering mould by adjusting the mounting positions of the pipe inserting assemblies.
Drawings
FIG. 1 is a schematic view of the overall appearance structure of the present invention;
FIG. 2 is a schematic view of the connection structure of the auxiliary agent adding assembly and the cannula assembly according to the present invention;
FIG. 3 is a partial sectional view of the connection between the outer injection tube and the inner injection tube according to the present invention;
FIG. 4 is a schematic view of a partial cross-sectional structure of an additive addition assembly according to the present invention;
FIG. 5 is an enlarged view taken at A in FIG. 1;
fig. 6 is an enlarged view of fig. 4 at B.
In the figure: 1-sintering the mould; 2-a cannula assembly; 3-an additive addition component; 4, positioning a plate; 5-injecting the outer tube; 6-injecting the inner tube; 7-a through hole; 8-a resisting plate; 9-a propulsion plate; 10-an addition piece; 11-addition of an outer tube; 12-adding an inner tube; 13-advancing the piston rod; 14-moving the plate; 15-inserting a piston rod; 16-pressing plate; 17-a feeding cavity; 18-feeding port; 19-an arc-shaped opening; and 20-pulling the plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the pressureless sintering apparatus for boron carbide ceramic shown in the figures includes a sintering mold 1, a plurality of tube inserting assemblies 2 are installed in the sintering mold 1, the number of the tube inserting assemblies 2 is determined according to the shape of the sintering mold 1, an additive adding assembly 3 for injecting a sintering additive is arranged outside the tube inserting assemblies 2, and the sintering additive is poured into the tube inserting assemblies 2 through the additive adding assembly 3.
The intubation tube component 2 comprises a positioning plate 4, the length of the positioning plate 4 can be customized according to the width or the shape of the sintering mold 1, the positioning plate 4 is matched with the sintering mold 1 and is clamped at two sides of the sintering mold 1, a plurality of injection outer tubes 5 are arranged on the positioning plate 4 at equal intervals, the injection inner tubes 6 are sleeved in the injection outer tubes 5 in a sliding mode, through holes 7 are formed in the outer sides of the injection outer tubes 5 and the injection inner tubes 6 and are connected with the auxiliary agent adding component 3 through the through holes 7, and the plurality of injection outer tubes 5 are uniformly distributed in the sintering mold 1 to fill sintering auxiliary agents in the sintering mold 1;
the outer side of the top end of the injection inner tube 6 is fixed with a pulling plate 20, which is convenient for the subsequent lifting movement of the injection inner tube 6.
The auxiliary agent adding assembly 3 comprises a resisting plate 8 and a pushing plate 9, a plurality of adding pieces 10 are fixed on the bottom plate, a moving plate 14 is fixed at the outer ends of the adding pieces 10, and the pushing plate 9 is connected with the tail ends of the adding pieces 10;
the adding part 10 comprises an adding outer tube 11 and a pushing piston rod 13, the adding outer tube 11 is fixed with the abutting plate 8, an adding inner tube 12 is inserted in the adding outer tube 11 in a sliding mode, the outer wall of the adding inner tube 12 is fixed with the moving plate 14, the pushing piston rod 13 is located in the adding inner tube 12, the tail end of the pushing piston rod 13 is fixed with the pushing plate 9, the pushing plate 9 drives the pushing piston rod 13 to move, pouring of sintering aids is achieved, and the sintering aids are left in the injecting inner tube 6 under the matching effect of the adding inner tube 12 and the adding outer tube 11;
in addition, the end of the adding inner tube 12 close to the pushing plate 9 is communicated with an adding cavity 17, the top of the adding cavity 17 is provided with a feeding port 18, and the auxiliary agent is poured in through the feeding port 18 to supplement the auxiliary agent.
An inserting piston rod 15 is arranged at the top of the inserting pipe assembly 2 corresponding to the position of the injection outer pipe 5, a pressing plate 16 is fixed at the top of the inserting piston rod 15, the inserting piston rod 15 is used for abutting against the auxiliary agent and the boron carbide particles in the injection inner pipe 6, and the inserting pipe assembly 2 is drawn out and left in the mold;
the abutting plate 8 is an arc-shaped plate matched with the injection outer pipe 5, the abutting plate is convenient to contact with the injection outer pipe 5, an arc-shaped opening 19 is formed in the inner side of the moving plate 14, the moving is more convenient, the outer diameter of the addition outer pipe 11 is consistent with the inner diameter of the through hole 7, and boron carbide particles can be prevented from coming out of a gap.
A boron carbide ceramic pressureless sintering process comprises the following steps;
s1, firstly, mounting a group of cannula assemblies 2 on a sintering die 1, and then, granulating boron carbide powder and pouring the granulated boron carbide powder into an inner tube 6;
s2, holding the filled auxiliary agent adding assembly 3 by hand, aligning the adding outer pipes 11 of the three adding frames with the through holes 7, at the moment, lifting the injecting inner pipe 6 to align the through holes 7 on the injecting inner pipe 6 with the through holes 7 on the injecting outer pipe 5, and inserting the adding outer pipe 11 until the bottom plate is contacted with the outer wall of the injecting outer pipe 5;
s3, the hand butts against the pushing plate 9, the moving plate 14 is pulled backwards, the adding inner tube 12 is drawn out, so that the auxiliary agent is left in the adding outer tube 11, and finally the adding outer tube 11 is slowly drawn out, so that the auxiliary agent is left in the injecting inner tube 6 in an equal layer;
s4, circulating the steps S1-S3 for multiple times until multiple groups of cannula assemblies 2 are uniformly arranged in the sintering mold 1;
s5, after a plurality of groups of filled inserting pipe assemblies 2 are uniformly arranged in the sintering mold 1, boron carbide powder is granulated and guided into the sintering mold 1 and filled, then the inserting pipe assemblies 2 are drawn out through the pinching positioning plate 4, so that the additives injected in an equal layer are remained in the sintering mold 1, and the pressing of the upper mold is carried out, so that the pressed green body is controlled through the adjustment of the positions of the plurality of groups of inserting assemblies, and the uniform injection of the additives is realized.
In the scheme, when adding the auxiliary agent, a group of cannula assemblies 2 are firstly installed in a sintering mold 1, a plurality of injection inner tubes 6 in the cannula assemblies 2 are filled with boron carbide particles, then a plurality of addition outer tubes 11 in the auxiliary agent adding assemblies 3 which are filled with the boron carbide particles are aligned to a plurality of through holes 7 on one injection outer tube 5, then a pulling plate 20 is held, the injection inner tubes 6 are pulled to be aligned with the through holes 7 on the injection outer tube 5, at the moment, the addition outer tubes 11 are inserted into the through holes 7, a resisting plate 8 is contacted with the outer wall of the injection outer tube 5, then a pushing plate 9 is extruded inwards, the auxiliary agent moves into the injection inner tubes 6, after the auxiliary agent is pushed in, the pushing plate 9 is resisted, a moving plate 14 is moved backwards, the addition inner tubes 12 are separated from the addition outer tubes 11, finally, the addition outer tubes 11 are slowly removed, the injection inner tubes 6 are pressed, and the two through holes 7 are staggered, materials are prevented from overflowing from the through hole 7, other injection inner pipes 6 in the cannula assembly 2 are injected with the auxiliary agents in a circulating mode, the cannula assembly 2 is installed in the sintering mold 1 in an evenly distributed mode, the auxiliary agents are injected in the same mode, after the auxiliary agents are injected into all the injection inner pipes 6 in equal layers, boron carbide particles are poured into the sintering mold 1, and at the moment, the plurality of positioning plates 4 are slowly pulled out, so that the boron carbide particles and the auxiliary agents injected into the inner pipes 6 are left in the sintering mold 1, compared with the existing stirring mode of the sintering auxiliary agents and the boron carbide particles, the injection of the sintering auxiliary agents is controllable and more evenly distributed, the phenomenon of uneven distribution during adding of the auxiliary agents is avoided, and the compactness of all the parts of the sintering auxiliary agents is different;
during the process of injecting the sintering aid, the aid adding component 3 is used up, and the aid is supplemented by moving the pushing piston rod 13 to the rear end and pouring the aid into the adding cavity 17 through the adding port 18.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a boron carbide pottery pressureless sintering device, includes sintering die (1), its characterized in that: a plurality of pipe inserting assemblies (2) are installed in the sintering mold (1), and an auxiliary agent adding assembly (3) used for injecting and guiding sintering auxiliary agents is arranged on the outer side of each pipe inserting assembly (2).
2. The pressureless sintering device for boron carbide ceramics according to claim 1, wherein: cannula subassembly (2) include locating plate (4), locating plate (4) and sintering mould (1) looks adaptation to the joint is in sintering mould (1) both sides, a plurality of injection outer tubes (5) are installed to equidistance on locating plate (4), and inject into equal sliding sleeve in outer tube (5) and have and inject inner tube (6), it has through-hole (7) all to open in outer tube (5) and injection inner tube (6) the outside to add subassembly (3) through-hole (7) and auxiliary agent and be connected.
3. The pressureless sintering device for boron carbide ceramics according to claim 2, wherein: the auxiliary agent adding assembly (3) comprises a resisting plate (8) and a pushing plate (9), a plurality of adding parts (10) are fixed on the bottom plate, a moving plate (14) is fixed at the outer end of each adding part (10), and the pushing plate (9) is connected with the tail ends of the adding parts (10).
4. The pressureless sintering device for boron carbide ceramics according to claim 3, wherein: the adding part (10) comprises an adding outer tube (11) and a pushing piston rod (13), the adding outer tube (11) is fixed to the abutting plate (8), an adding inner tube (12) is inserted into the adding outer tube (11) in a sliding mode, the outer wall of the adding inner tube (12) is fixed to the moving plate (14), the pushing piston rod (13) is located in the adding inner tube (12), and the tail end of the pushing piston rod (13) is fixed to the pushing plate (9).
5. The pressureless sintering device for boron carbide ceramics according to claim 4, wherein: an inserting piston rod (15) is arranged at the top of the inserting pipe assembly (2) corresponding to the position of the injection outer pipe (5), and a pressing plate (16) is fixed at the top of the inserting piston rod (15).
6. The pressureless sintering device for boron carbide ceramics according to claim 5, wherein: one end of the adding inner pipe (12) close to the pushing plate (9) is communicated with a material adding cavity (17), and the top of the material adding cavity (17) is provided with a material adding port (18).
7. The pressureless sintering device for boron carbide ceramics according to claim 6, wherein: the abutting plate (8) is an arc-shaped plate matched with the injection outer pipe (5), an arc-shaped opening (19) is formed in the inner side of the moving plate (14), and the outer diameter of the addition outer pipe (11) is consistent with the inner diameter of the through hole (7).
8. The pressureless sintering device for boron carbide ceramics according to claim 7, wherein: and a pulling plate (20) is fixed on the outer side of the top end of the injection inner pipe (6).
9. The pressureless sintering process of boron carbide ceramics according to claim 8, comprising the steps of;
s1, firstly, mounting a group of cannula assemblies (2) on a sintering die (1), and then, granulating boron carbide powder and pouring the granulated boron carbide powder into an inner tube (6);
s2, holding the filled auxiliary agent adding assembly (3) by hand, aligning the adding outer pipes (11) of the three adding frames with the through holes (7), aligning the through holes (7) on the injecting inner pipe (6) with the through holes (7) on the injecting outer pipe (5) by lifting the injecting inner pipe (6), and inserting the adding outer pipes (11) until the bottom plate is contacted with the outer wall of the injecting outer pipe (5);
s3, a hand is abutted against the pushing plate (9), the moving plate (14) is pulled backwards, the adding inner tube (12) is drawn out, so that the auxiliary agent is left in the adding outer tube (11), and finally the adding outer tube (11) is slowly drawn out, so that the auxiliary agent is left in the injecting inner tube (6) in an equal layer;
s4, circulating the steps S1-S3 for multiple times until multiple groups of cannula assemblies (2) are uniformly arranged in the sintering mold (1);
s5, after a plurality of groups of filled inserting pipe assemblies (2) are uniformly arranged in the sintering mold (1), the boron carbide powder is granulated and guided into the sintering mold (1) and filled, then the inserting pipe assemblies (2) are drawn out by pinching the positioning plate (4), so that the additives injected in an equal layer are remained in the sintering mold (1), and the pressed green body is pressed by pressing the upper mold, and the control of uniform injection of the additives is realized by adjusting the positions of the plurality of groups of inserting assemblies.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010168993.9A CN111306940B (en) | 2020-03-12 | 2020-03-12 | Boron carbide ceramic pressureless sintering process and device |
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| CN202010168993.9A CN111306940B (en) | 2020-03-12 | 2020-03-12 | Boron carbide ceramic pressureless sintering process and device |
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Cited By (2)
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| CN114478028A (en) * | 2022-02-15 | 2022-05-13 | 浙江吉成新材股份有限公司 | Boron carbide ceramic sintering process |
| CN116379783A (en) * | 2023-04-08 | 2023-07-04 | 南通三责精密陶瓷有限公司 | Carrier for pressureless liquid phase sintering silicon carbide ceramic |
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| CN202824654U (en) * | 2012-10-10 | 2013-03-27 | 宁波宏垒磁业有限公司 | Sintered Nd-Fe-B pressing mold |
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| CN114478028A (en) * | 2022-02-15 | 2022-05-13 | 浙江吉成新材股份有限公司 | Boron carbide ceramic sintering process |
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| CN116379783A (en) * | 2023-04-08 | 2023-07-04 | 南通三责精密陶瓷有限公司 | Carrier for pressureless liquid phase sintering silicon carbide ceramic |
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| CN111306940B (en) | 2021-11-09 |
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