CN110723966A - Preparation method of fan-shaped flaky ceramic core - Google Patents
Preparation method of fan-shaped flaky ceramic core Download PDFInfo
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- CN110723966A CN110723966A CN201911106209.5A CN201911106209A CN110723966A CN 110723966 A CN110723966 A CN 110723966A CN 201911106209 A CN201911106209 A CN 201911106209A CN 110723966 A CN110723966 A CN 110723966A
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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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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- 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
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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
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- 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
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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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- 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
- C04B2235/36—Glass starting materials for making ceramics, e.g. silica glass
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- 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
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C04B2235/00—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
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
Abstract
The invention discloses a preparation method of a fan-shaped flaky ceramic core, which comprises the following steps: preparing a mould for preparing an annular ceramic core, wherein the annular ceramic core comprises a plurality of fan-shaped flaky ceramic cores and a plurality of connecting blocks for connecting the fan-shaped flaky ceramic cores into a ring, a plurality of core inner cavities for forming the fan-shaped flaky ceramic cores and a plurality of connecting inner cavities for forming the connecting blocks are formed in the mould, and the core inner cavities and the connecting inner cavities are distributed in a staggered mode and are communicated into an annular structure; injecting the ceramic core slurry into a mold, pressing and molding, and demolding to obtain a biscuit of the annular ceramic core; sintering and molding the biscuit of the annular ceramic core to obtain the annular ceramic core; and removing the connecting blocks connected to the end faces of the fan-shaped flaky ceramic cores to obtain a plurality of fan-shaped flaky ceramic cores.
Description
Technical Field
The invention relates to the technical field of ceramic core preparation, in particular to a preparation method of a fan-shaped flaky ceramic core.
Background
Many fan-shaped slice ceramic cores need to be used on the aeroengine precision casting, because fan-shaped slice ceramic core's thickness size is very little, the in-process such as press forming, shaping back drawing of patterns and sintering warp easily very much, especially to fan-shaped slice ceramic core of curved surface shape such as fan-shaped, warp more easily, need shift to carry out the sintering in the burning bowl after the shaping drawing of patterns in addition, it is big to shift the degree of difficulty, and shifts in-process fan-shaped slice ceramic core and empty the damage easily.
Disclosure of Invention
The invention provides a preparation method of a fan-shaped flaky ceramic core, which aims to solve the technical problem that the existing fan-shaped flaky ceramic core is easy to deform and damage in the preparation process.
According to one aspect of the invention, a method for preparing a fan-shaped flaky ceramic core is provided, which comprises the following steps: preparing a mould for preparing an annular ceramic core, wherein the annular ceramic core comprises a plurality of fan-shaped flaky ceramic cores and a plurality of connecting blocks for connecting the fan-shaped flaky ceramic cores into a ring, a plurality of core inner cavities for forming the fan-shaped flaky ceramic cores and a plurality of connecting inner cavities for forming the connecting blocks are formed in the mould, and the core inner cavities and the connecting inner cavities are distributed in a staggered mode and are communicated into an annular structure; injecting the ceramic core slurry into a mold, pressing and molding, and demolding to obtain a biscuit of the annular ceramic core; sintering and molding the biscuit of the annular ceramic core to obtain the annular ceramic core; and removing the connecting blocks connected to the side end faces of the fan-shaped flaky ceramic cores to obtain a plurality of fan-shaped flaky ceramic cores.
Further, the connecting block is connected to the side end face of the fan-shaped sheet-shaped ceramic core, and the cross-sectional area of the connecting block is smaller than that of the fan-shaped sheet-shaped ceramic core.
Furthermore, the fan-shaped flaky ceramic core and the connecting block are both fan-shaped, the annular ceramic core is a full circle ring, and the radian of the connecting block is 5-15 degrees.
Further, formulating a ceramic core slurry comprising the steps of: mixing quartz glass powder and mullite powder in proportion, fully and uniformly mixing by ball milling, and placing the uniformly mixed powder in a baking oven at 150-200 ℃ for baking for 2-4 hours to dry the uniformly mixed powder; when ceramic core slurry is prepared, a plasticizer accounting for 15% -20% of the total amount of powder is added into a clean crucible and melted; adding the dried powder under continuous stirring, adding oleic acid with the weight of 0.5-1% of the weight of the powder, and continuously stirring for more than 2 hours until the ceramic core slurry is uniform, has no bubbles and has better fluidity.
Further, the annular ceramic core is pressed and formed by an automatic core pressing machine according to specified pressing parameters: the grouting pressure is 75Bar-80Bar, the mold clamping pressure is 90Bar-110Bar, the grouting time is 23 seconds-28 seconds, the pressing time is 18 seconds-22 seconds, and the temperature of the slurry and the grouting system is 80 ℃ to 90 ℃.
Further, after the biscuit of the annular ceramic core is demoulded, a filling port, flash and flash on the biscuit of the annular ceramic core are removed.
Further, the biscuit sintering forming of the annular ceramic core comprises the following steps: loose alumina powder is filled in the ceramic pot to form an alumina powder layer; laying the biscuit of the annular ceramic core on the alumina powder layer, filling the sieved loose alumina powder, and vibrating for 3-5 minutes; placing the ceramic pot in a temperature-uniform area of a hearth of a ceramic core roasting furnace; slowly heating the ceramic core roasting furnace, and preserving heat for 1 hour when the temperature is raised to 200 ℃, 550 ℃ and 900 ℃ respectively, and further preserving heat for 4 hours when the temperature is raised to 1200 ℃; and (3) powering off the ceramic core roasting furnace until the temperature is reduced to below 300 ℃, taking out the ceramic bowl from the ceramic core roasting furnace until the temperature in the ceramic bowl is cooled to below 150 ℃, and taking out the sintered annular ceramic core from the ceramic bowl.
Further, the thickness of the alumina powder layer was 40 mm.
Further, removing the connecting block connected to the end face of the fan-shaped chip ceramic core, comprising the steps of: cutting off the connecting block, and grinding off the connecting block connected to the end face of the fan-shaped flaky ceramic core by grinding; or cutting off a part of arc section of the connecting block, and grinding off the residual connecting block on the end face of the fan-shaped sheet ceramic core by grinding to form a complete plane on the end face.
Further, after the connecting block attached to the end surface of the fan-shaped chip ceramic core is removed, the surface of the fan-shaped chip ceramic core is strengthened to reduce cracks on the surface of the fan-shaped chip ceramic core and to improve the strength of the fan-shaped chip ceramic core at room temperature and high temperature.
Further, after the connecting block connected to the end face of the fan-shaped sheet ceramic core is removed, the surface of the fan-shaped sheet ceramic core is strengthened to reduce cracks on the surface of the fan-shaped sheet ceramic core and improve the room temperature or high temperature strength of the fan-shaped sheet ceramic core.
The invention has the following beneficial effects:
the invention relates to a preparation method of a fan-shaped sheet ceramic core, which comprises the steps of firstly preparing an annular ceramic core formed by a plurality of fan-shaped sheet ceramic cores and a plurality of connecting blocks which are arranged in a staggered mode and connected into a ring, injecting ceramic core slurry into a mould for preparing the annular ceramic core, so that the plurality of fan-shaped sheet ceramic cores are respectively pressed and formed in a plurality of core inner cavities in the mould, the plurality of connecting blocks are respectively pressed and formed in a plurality of connecting inner cavities in the mould, a biscuit of the annular ceramic core is obtained after demoulding, then the biscuit of the annular ceramic core is transferred into a burning pot for sintering and forming, the plurality of fan-shaped sheet ceramic cores and the plurality of connecting blocks are connected into a ring, so that the structure is stable, each fan-shaped sheet ceramic core is limited, the fan-shaped sheet ceramic cores are prevented from deforming in the processes of pressing and demoulding and sintering, and the annular ceramic cores are easy to, and finally, removing the connecting blocks connected among the fan-shaped flaky ceramic cores to prepare a plurality of fan-shaped flaky ceramic cores.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of an annular ceramic core of a preferred embodiment of the present invention;
FIG. 2 is a flow chart of a method of making a fan-shaped ceramic pellet core in accordance with a preferred embodiment of the present invention.
Illustration of the drawings:
1. an annular ceramic core; 2. a fan-shaped flaky ceramic core; 3. and (4) connecting the blocks.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
FIG. 1 is a schematic structural view of an annular ceramic core of a preferred embodiment of the present invention; FIG. 2 is a flow chart of a method of making a fan-shaped ceramic pellet core in accordance with a preferred embodiment of the present invention.
As shown in fig. 1 and 2, the method for manufacturing the fan-shaped chip ceramic core 2 of the present embodiment includes the steps of: preparing a mould for preparing an annular ceramic core 1, wherein the annular ceramic core 1 comprises a plurality of fan-shaped flaky ceramic cores 2 and connecting blocks 3 for connecting the fan-shaped flaky ceramic cores 2 into a ring, a plurality of core inner cavities for forming the fan-shaped flaky ceramic cores 2 and a plurality of connecting inner cavities for forming the connecting blocks 3 are formed in the mould, and the core inner cavities and the connecting inner cavities are distributed in a staggered manner and are communicated into an annular structure; injecting the ceramic core slurry into a mold, pressing and molding, and demolding to obtain a biscuit of the annular ceramic core 1; sintering and molding the biscuit of the annular ceramic core 1 to obtain the annular ceramic core 1; and removing the connecting blocks 3 connected to the end surfaces of the fan-shaped sheet-shaped ceramic cores 2 to obtain a plurality of fan-shaped sheet-shaped ceramic cores 2. The invention relates to a preparation method of a fan-shaped sheet ceramic core 2, which comprises the steps of firstly preparing an annular ceramic core 1 formed by a plurality of fan-shaped sheet ceramic cores 2 and a plurality of connecting blocks 3 which are arranged in a staggered mode and connected into a ring, injecting ceramic core slurry into a mould for preparing the annular ceramic core 1, so that the fan-shaped sheet ceramic cores 2 are respectively pressed and formed in a plurality of core inner cavities in the mould, the connecting blocks 3 are respectively pressed and formed in a plurality of connecting inner cavities in the mould, demoulding to obtain a biscuit of the annular ceramic core 1, then transferring the biscuit of the annular ceramic core 1 into a burning pot for sintering and forming, the fan-shaped sheet ceramic cores 2 and the connecting blocks 3 are connected into a ring, so that the structure is stable, and each fan-shaped sheet ceramic core 2 is limited, thereby avoiding the fan-shaped sheet ceramic cores 2 from deforming in the processes of pressing, demoulding and sintering, and the annular ceramic cores 1 are easily transferred and are not easily damaged, and finally, a plurality of fan-shaped sheet-shaped ceramic cores 2 are prepared by removing the connection blocks 3 connected between the fan-shaped sheet-shaped ceramic cores 2.
As shown in fig. 2, the connecting piece 3 is connected to the end face of the fan-shaped chip ceramic core 2, and the cross-sectional area of the connecting cavity is smaller than that of the core cavity. Every connecting block 3 can be connected two fan-shaped slice ceramic core 2 firmly to guarantee that fan-shaped slice ceramic core 2 can not warp at press forming, drawing of patterns and sintering shaping's in-process, easily shift and shift the difficult impairement of in-process, simultaneously after sintering shaping, easily will connect connecting block 3 between fan-shaped slice ceramic core 2 and get rid of. The size of connecting block 3 designs into the size that is less than fan-shaped slice ceramic core 2, has consequently formed a plane around fan-shaped slice ceramic core and the 3 junction of connecting block, when polishing connecting block 3 after the cutting, polish unnecessary part to with plane parallel and level all around just qualified, the benchmark of polishing is clear and definite, the requirement is clear, easy operation easily guarantees the size of polishing.
The fan-shaped flaky ceramic core 2 and the connecting block 3 are both fan-shaped, the annular ceramic core 1 is a full circular ring, and the radian of the connecting block 3 is 5-15 degrees. In the present embodiment, the fan-shaped sheet-like ceramic core 2 and the joint block 3 are both fan-shaped. The number of the fan-shaped chip ceramic cores in the annular ceramic core 1 and the number and the radian of the connecting pieces 3 are determined according to the radian of the single fan-shaped chip ceramic core 2. The radius of the inner side surface of the fan-shaped flaky ceramic core 2 is 36mm, the radius of the outer side surface is 40mm, the radian is 80 degrees, and the height is 20 mm. The radius of the inner side surface of the connecting block 3 is 37mm, the radius of the outer side surface is 39mm, the radian is 10 degrees, and the height is 15 mm. Four fan-shaped flaky ceramic cores 2 are connected into a circular ring through four connecting blocks 3. Optionally, the fan-shaped sheet ceramic core 2 is rectangular, the connecting blocks 3 are fan-shaped, the connecting blocks 3 are connected to the end face of the fan-shaped sheet ceramic core 2, and the plurality of fan-shaped sheet ceramic cores 2 are connected into a polygonal annular ring-shaped ceramic model with rounded corner transition through the plurality of connecting blocks 3. Alternatively, the fan-shaped sheet ceramic core 2 and the connecting block 3 are both rectangular, the connecting block 3 is connected to the side of the fan-shaped sheet ceramic core 2, and the two fan-shaped sheet ceramic cores 2 are connected to the rectangular annular ceramic core 1 through the two connecting blocks 3.
The ceramic core slurry is prepared from quartz glass powder, mullite material and a plasticizer. Firstly, quartz glass powder and mullite powder are mixed according to a certain proportion and then are fully and uniformly mixed through ball milling, and the uniformly mixed powder is placed in a baking oven at the temperature of 150-200 ℃ for baking for 2-4 hours so as to dry the uniformly mixed powder. When ceramic core slurry is prepared, firstly, a plasticizer accounting for 15% -20% of the total amount of powder is added into a clean crucible and melted, dried powder is added continuously under continuous stirring, then oleic acid accounting for 0.5% -1% of the weight of the powder is added, stirring is continuously carried out for more than 2 hours until the ceramic core slurry is uniform, free of bubbles and good in fluidity, finally, a mold of the annular ceramic core 1 is heated to a certain temperature after the mold is installed, the ceramic core slurry is rapidly injected into the mold through hydraulic pressure and is kept for a period of time, the ceramic core slurry in the mold is cooled and formed, and a biscuit of the annular ceramic core 1 is obtained after demolding.
The annular ceramic core 1 is pressed and formed by adopting an automatic core pressing machine according to specified pressing parameters: the grouting pressure is 75Bar-80Bar, the mold clamping pressure is 90Bar-110Bar, the grouting time is 23 seconds-28 seconds, the pressing time is 18 seconds-22 seconds, and the temperature of the slurry and the grouting system is 80 ℃ to 90 ℃.
After the biscuit of the annular ceramic core 1 is demolded, burrs on the biscuit of the annular ceramic core 1 are removed. After the annular ceramic core 1 is sintered and molded, the annular ceramic core 1 is taken out from the burning bowl, sand grains adhered to the surface of the annular ceramic core 1 are brushed off, and burrs are trimmed.
The biscuit sintering forming of the annular ceramic core 1 comprises the following steps: loose alumina powder is filled in the ceramic pot to form an alumina powder layer; laying the biscuit of the annular ceramic core on the alumina powder layer, filling the sieved loose alumina powder, and vibrating for 3-5 minutes; placing the ceramic pot in a temperature-uniform area of a hearth of a ceramic core roasting furnace; slowly heating the ceramic core roasting furnace, and preserving heat for 1 hour when the temperature is raised to 200 ℃, 550 ℃ and 900 ℃ respectively, and further preserving heat for 4 hours when the temperature is raised to 1200 ℃; and (3) powering off the ceramic core roasting furnace until the temperature is reduced to below 300 ℃, taking out the ceramic bowl from the ceramic core roasting furnace until the temperature in the ceramic bowl is cooled to below 150 ℃, and taking out the sintered annular ceramic core from the ceramic bowl. In this example, the thickness of the alumina powder layer was 40 mm. Because the temperature of the bottom of the ceramic bowl is higher during sintering, the biscuit of the annular ceramic core is separated from the bottom of the ceramic bowl through alumina layering, so that the temperature of the biscuit of the annular ceramic core is more uniform during sintering. The biscuit bodies of the plurality of annular ceramic cores are placed in the same ceramic bowl and are sintered and molded simultaneously, and the distance between the biscuit bodies of the plurality of annular ceramic cores and the distance between the biscuit bodies of the annular ceramic cores and the wall surface of the ceramic bowl are not less than 10 mm. And taking the sintered and molded annular ceramic core out of the ceramic bowl, brushing sand adhered to the surface of the annular ceramic core, and trimming burrs.
Removing the connecting blocks 3 connected to the end surfaces of the fan-shaped chip ceramic cores 2, comprising the steps of: cutting off the connecting block 3, and grinding off the connecting block 3 connected to the end face of the fan-shaped flaky ceramic core 2 by grinding; or cutting off a part of arc section of the connecting block 3, grinding off the residual connecting block 3 on the end surface of the fan-shaped sheet ceramic core 2 by grinding, and grinding the connecting block 3 to be flush with the peripheral plane so as to enable the end surface to form a complete plane.
After the connection blocks 3 attached to the end surfaces of the fan-shaped chip ceramic core 2 are removed, the surface of the fan-shaped chip ceramic core 2 is strengthened to reduce cracks on the surface of the fan-shaped chip ceramic core 2 and to improve the strength of the fan-shaped chip ceramic core 2 at room temperature and high temperature. And (3) putting the fan-shaped sheet ceramic core 2 into a surface hardening agent, soaking for a period of time, taking out, airing and baking, thereby strengthening the surface of the fan-shaped sheet ceramic core 2.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The preparation method of the fan-shaped flaky ceramic core is characterized by comprising the following steps of:
preparing a mould for preparing an annular ceramic core (1), wherein the annular ceramic core (1) comprises a plurality of fan-shaped flaky ceramic cores (2) and a plurality of connecting blocks (3) for connecting the fan-shaped flaky ceramic cores (2) into a ring, a plurality of core inner cavities for forming the fan-shaped flaky ceramic cores (2) and a plurality of connecting inner cavities for forming the connecting blocks (3) are arranged in the mould, and the core inner cavities and the connecting inner cavities are distributed in a staggered mode and are communicated into an annular structure;
injecting the ceramic core slurry into a mold, pressing and molding, and demolding to obtain a biscuit of the annular ceramic core (1);
sintering and molding the biscuit of the annular ceramic core (1) to obtain the annular ceramic core (1);
and removing the connecting blocks (3) connected to the side end faces of the fan-shaped sheet-shaped ceramic cores (2) to obtain a plurality of fan-shaped sheet-shaped ceramic cores (2).
2. The method of manufacturing a fan-shaped chip ceramic core according to claim 1,
the connecting block (3) is connected to the side end face of the fan-shaped sheet-shaped ceramic core (2), and the cross sectional area of the connecting block (3) is smaller than that of the fan-shaped sheet-shaped ceramic core (2).
3. The method of manufacturing a fan-shaped chip ceramic core according to claim 1,
the fan-shaped flaky ceramic core (2) and the connecting block (3) are both fan-shaped, the annular ceramic core (1) is a full circular ring, and the radian of the connecting block (3) is 5-15 degrees.
4. The method of making a fan-shaped ceramic chip core as claimed in claim 1, wherein the step of preparing a ceramic chip slurry comprises the steps of:
mixing quartz glass powder and mullite powder in proportion, fully and uniformly mixing by ball milling, and placing the uniformly mixed powder in a baking oven at 150-200 ℃ for baking for 2-4 hours to dry the uniformly mixed powder;
when ceramic core slurry is prepared, a plasticizer accounting for 15% -20% of the total amount of powder is added into a clean crucible and melted;
adding the dried powder under continuous stirring, adding oleic acid with the weight of 0.5-1% of the weight of the powder, and continuously stirring for more than 2 hours until the ceramic core slurry is uniform, has no bubbles and has better fluidity.
5. The method of manufacturing a fan-shaped chip ceramic core according to claim 1,
the press forming of the annular ceramic core (1) adopts an automatic core pressing machine, and the pressing is carried out according to specified pressing parameters: the grouting pressure is 75Bar-80Bar, the mold clamping pressure is 90Bar-110Bar, the grouting time is 23 seconds-28 seconds, the pressing time is 18 seconds-22 seconds, and the temperature of the slurry and the grouting system is 80 ℃ to 90 ℃.
6. The method of manufacturing a fan-shaped chip ceramic core according to claim 1,
and after the biscuit of the annular ceramic core (1) is demoulded, removing a filling port, flash and flash on the biscuit of the annular ceramic core (1).
7. The method for the production of fan-shaped ceramic plate cores according to claim 1, characterized in that the biscuit sintering of the annular ceramic core (1) is shaped comprising the following steps:
loose alumina powder is filled in the ceramic pot to form an alumina powder layer;
laying the biscuit of the annular ceramic core on the alumina powder layer, filling the sieved loose alumina powder, and vibrating for 3-5 minutes;
placing the ceramic pot in a temperature-uniform area of a hearth of a ceramic core roasting furnace;
slowly heating the ceramic core roasting furnace, and preserving heat for 1 hour when the temperature is raised to 200 ℃, 550 ℃ and 900 ℃ respectively, and further preserving heat for 4 hours when the temperature is raised to 1200 ℃;
and (3) powering off the ceramic core roasting furnace until the temperature is reduced to below 300 ℃, taking out the ceramic bowl from the ceramic core roasting furnace until the temperature in the ceramic bowl is cooled to below 150 ℃, and taking out the sintered annular ceramic core from the ceramic bowl.
8. The method of manufacturing a fan-shaped ceramic pellet core as claimed in claim 7,
the thickness of the alumina powder layer was 40 mm.
9. The method for manufacturing a ceramic core having a fan-shaped plate shape according to claim 1, wherein the removal of the joint block (3) attached to the end surface of the ceramic core having a fan-shaped plate shape (2) comprises the steps of:
cutting off the connecting block (3), and grinding the connecting block (3) connected to the end face of the fan-shaped sheet-shaped ceramic core (2) by grinding; or cutting off a part of arc section of the connecting block (3), and grinding the residual connecting block (3) on the end surface of the fan-shaped sheet ceramic core (2) by grinding to form a complete plane on the end surface.
10. The method of manufacturing a fan-shaped chip ceramic core according to claim 1,
after the connecting blocks (3) connected to the end faces of the fan-shaped sheet-shaped ceramic core (2) are removed, the surface of the fan-shaped sheet-shaped ceramic core (2) is strengthened to reduce cracks on the surface of the fan-shaped sheet-shaped ceramic core (2) and improve the strength of the fan-shaped sheet-shaped ceramic core at room temperature and high temperature.
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| CN114260999A (en) * | 2021-12-31 | 2022-04-01 | 江苏永瀚特种合金技术股份有限公司 | Method for increasing strength of weak part of large-scale oriented single crystal ceramic by embedding platinum wire |
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| CN110723966B (en) | 2022-04-01 |
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