CN108947499A - The preparation method and ceramic core of ceramic core - Google Patents
The preparation method and ceramic core of ceramic core Download PDFInfo
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- CN108947499A CN108947499A CN201810911790.7A CN201810911790A CN108947499A CN 108947499 A CN108947499 A CN 108947499A CN 201810911790 A CN201810911790 A CN 201810911790A CN 108947499 A CN108947499 A CN 108947499A
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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
- C04B35/01—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
- C04B35/10—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 aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
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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
- B22C9/101—Permanent cores
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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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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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
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
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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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3409—Boron oxide, borates, boric acids, or oxide forming salts thereof, e.g. borax
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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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6022—Injection moulding
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/606—Drying
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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 present invention relates to ceramic core preparation method and ceramic core, the preparation method of ceramic core includes: to choose refractory material, bonding agent, mineralizer and additive slurry is made by the mixing of specific proportion；Slurry is poured into mold, drying and moulding obtains ceramic core just body；Body at the beginning of ceramic core is put into Muffle kiln roasting, forms ceramic core.Ceramic core prepared by the present invention has the advantages that refractoriness is high, surface quality is high, dimensional accuracy is high, has that enough intensity, chemical stability be good, easily removes after casting, and preparation is simple, low in raw material price, due to increasing waterproof material processing step, increase itself intensity simultaneously, in turn avoid influence of the moisture to intensity.
Description
Technical field
The present invention relates to alloy Investment casting technology field, in particular to a kind of ceramic core preparation method and ceramic mould
Core.
Background technique
Full form casting process just increasingly develops toward the direction of hot investment casting, and the maximum feature of hot investment casting is can to manufacture
Shape and structure is complicated, it is difficult to the various metal parts of other technological formings.But it still frequently encounters require casting in production
Inner cavity has higher surface smoothness than gabarit, therefore is unable to satisfy using general precision casting technology, to complicated inner cavity, and
Demanding casting, it is necessary to be formed using ceramic core.If do not used, then castings can not be produced.Due to the complexity of casting
The quality of inner cavity and the quality of ceramic core are closely related, so the key that the quality for improving ceramic core becomes urgent need to resolve is asked
Topic.
In model casting, ceramic core is final application in the encirclement by high temperature fluent metal.It is most commonly used at present
It is the alloys such as exigent stainless steel, iron-based, Ni-based, cobalt-based.And the acceptability condition of type core is heated to together with casting mold
It 900~1050 DEG C, is surrounded in casting by metal, type core can be heated to 1100~1350 DEG C or so.In addition, ceramic core is most
It need to be removed from casting eventually, therefore should also can withstand the boiling and roasting of steam durings dewaxing, washing shell, roasting etc.
High temperature action when burning.In short, ceramic core is more demanding, should have refractoriness height, surface quality height, low thermal expansion,
The features such as dimensionally stable, dimensional accuracy are high, chemical stability is good, enough intensity, easy removing.
Summary of the invention
The purpose of the present invention is in order to solve the above problem, the present invention provides a kind of simple and easy, low-cost be suitable for
The preparation process of the ceramic core and using the technique preparation have water-proof function, surface quality height, dimensionally stable, size
Precision is high, intensity is high, chemical stability is good, the ceramic core for the advantages that easily removing after casting.
According to an aspect of the present invention, a kind of preparation method of ceramic core is provided, comprising steps of
It chooses refractory material, bonding agent, mineralizer and additive and slurry is made by the mixing of specific proportion；
Slurry is poured into mold, drying and moulding obtains ceramic core just body；
Body at the beginning of ceramic core is put into Muffle kiln roasting, forms ceramic core.
Wherein, the refractory material of selection includes two kinds of forms of fine powder and coarse powder, wherein fine powder proportion are as follows: 50~
90wt%, coarse powder proportion are 10~50wt%, and wherein powder particle size is 300~500 mesh, and coarse granularity is 80~300 mesh.
Wherein, the mineralizer includes the one or more of magnesia, titanium oxide, silica flour and borax, specific proportion are as follows:
The ratio of refractory material and bonding agent is 1.5~5g/ml；Magnesia additional amount accounts for the specific gravity of refractory material: 0.1~
2wt%；Titanium oxide additional amount accounts for the specific gravity of refractory material: 0.1~8wt%；Silica flour additional amount accounts for the specific gravity of refractory material: 1
~30wt%；Borax additional amount accounts for the specific gravity of refractory material: 0.1~5wt%；The additional amount of additive accounts for the ratio of refractory material
Weight: 1~20wt%.
Wherein, the refractory material include one of bauxite powder, coal gangue powder, electro-corundum powder and white fused alumina sand or
It is a variety of；The bonding agent is silica solution；The mineralizer includes one of magnesia, titanium oxide, silica flour and borax or more
Kind；Additive includes one or both of boric anhydride, boric acid.
The additive is made of boric acid and boric anhydride, and the weight ratio of boric acid and boric anhydride is 30~300%.
Wherein, when mineralizer contains magnesia, the step of slurry is made, includes:
Solid powder in addition to magnesia is uniformly mixed；
Then bonding agent is added in the solid powder of mixing, mixing forms slurry precast body；
Magnesium oxide powder is added in slurry precast body, mixing forms slurry；
When mineralizer does not contain magnesia, the step of slurry is made, includes:
Solid powder in addition to bonding agent is uniformly mixed；
Then bonding agent is added in the solid powder after mixing, mixing forms slurry.
Wherein, be made ceramic core just body the step of in, drying mode be spontaneously dry or low temperature drying, natural drying
Time is 10min~48h, and the temperature of low temperature drying is 40~200 DEG C, the time of low temperature drying are as follows: 30min~for 24 hours；Pottery is made
In the step of porcelain type core, maturing temperature is 400~2000 DEG C, and the time is 1~5h.
According to the second aspect of the invention, the ceramic core of preparation method preparation is provided.
According to the third aspect of the invention we, the preparation method of water proof type ceramic core is provided, comprising: put the ceramic core
Enter in waterproof material to impregnate, dry, soaking time are as follows: 30~120min；Drying time are as follows: 30~120min, drying temperature are as follows:
40~200 DEG C.
According to the fourth aspect of the invention, the water proof type ceramic core of preparation method preparation is provided.
In the present invention, the proportion of powder liquor ratio mainly influences core moulding and intensity；The addition of mineralizer, which primarily serves, makes type
The effect of core enhanced strength and the cleaning difficulty of reduction type core: where the appropriate addition of magnesia can be used as the solidification of slurry
Agent shortens the setting time of slurry, improves production efficiency, meanwhile, using the reaction of magnesia and aluminium oxide, promotion can be played and burnt
The effect of knot；The appropriate addition of titanium oxide primarily serves the effect of acceleration of sintering；The appropriate addition of borax primarily serves promotion and burns
The effect of knot；The appropriate addition of silica flour mainly achievees the purpose that easy to clean after casting；The grain size proportion of refractory material is (with 300 mesh
Distinguish thick, fine powder) mainly the surface quality, intensity of effect type core and cleaning are difficult to degree, wherein and the addition of coarse powder mainly improves
Core strength, reduces cleaning difficulty, and the addition of fine powder mainly improves whose surfaces quality；The addition of boric acid/boric anhydride mainly reduces
The cleaning difficulty of type core.
Preparation is simple for ceramic core of the invention, low in raw material price, and ceramic core itself tool prepared
Have that refractoriness is high, surface quality is high, dimensional accuracy is high, has the advantages of enough intensity, chemical stability be good, easily removes after casting,
Increase the step of handling using waterproof material, had both increased the intensity of ceramic core itself, and in turn avoided it in use
Influence of the moisture to its intensity.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 shows the pictorial diagram of the ceramic core of embodiment according to the present invention
Fig. 2 shows the 3 D laser scanning size detection figures of the ceramic core of embodiment according to the present invention；
Fig. 3 shows the pictorial diagram of the ceramic core of embodiment according to the present invention；
Fig. 4 shows the inner cavity pictorial diagram of the mold for preparing ceramic core of embodiment according to the present invention.
Specific embodiment
Below with reference to the illustrative embodiments that the disclosure is more fully described.Although showing the disclosure in specification
Illustrative embodiments, it being understood, however, that may be realized in various forms the disclosure without the implementation that should be illustrated here
Mode is limited.It is to be able to thoroughly understand the disclosure on the contrary, providing these embodiments, and can be by the disclosure
Range be fully disclosed to those skilled in the art.
The preparation process of 1 water proof type ceramic core X of embodiment
The following steps are included:
Raw material is weighed by set proportion.Selection of refractory bauxite powder (325 mesh) and white fused alumina sand (100 mesh), wherein
Bauxite powder accounts for 90wt%；The proportional arrangement that silica solution is 3g/ml according to powder liquor ratio；MgO accounts for the 1wt% of refractory material；TiO2
Account for the 3wt% of refractory material；Silica flour accounts for the 18% of refractory material；Borax accounts for the 10% of refractory material；Boric anhydride accounts for refractory material
5%.
Raw material is uniformly mixed.Raw material powder (in addition to MgO) is put into ball mill and grinds, taken out after stirring 45min；It will
Mixed-powder is put into blender, and silica solution adds several times, and stirring 30min obtains uniform sizing material；It is eventually adding MgO powder,
15min is stirred, uniform sizing material is obtained.
Prepare ceramic core just body.The slurry stirred evenly is poured into mold immediately, natural drying is taken out afterwards for 24 hours.
Roasting, is placed in Muffle kiln roasting for body at the beginning of above-mentioned ceramic core, obtains high-intensitive ceramic core, roasts item
Part: temperature is 800 DEG C, time 3h.
Prepare water proof type ceramic core, including two processes of waterproof material processing and drying.Waterproof material processing: will be above-mentioned
High-strength ceramic type core, which is placed in polyurethane water-proof paint, to be impregnated, soaking time 30min.Drying: by above-mentioned through waterproof material
The ceramic core of processing, which is put into Muffle furnace, dries, and obtains water proof type ceramic core X, drying condition are as follows: and temperature is 100 DEG C, when
Between be 0.5h.
Detection: as depicted in figs. 1 and 2, by pictorial diagram and the 3 D laser scanning size detection figure of ceramic core X it is found that
Ceramic core feature is complete and scale error is within ± 0.4mm, it was demonstrated that the ceramic core has low thermal expansion, size essence
Spend high advantage.
By pictorial diagram and the 3 D laser scanning size detection figure of ceramic core X it is found that ceramic core feature is complete and ruler
Very little error is within ± 0.4mm, it was demonstrated that the ceramic core has the advantages that low thermal expansion, dimensional accuracy are high.
Embodiment 2
The following steps are included:
Raw material is weighed by set proportion.Selection of refractory coal gangue powder, electro-corundum powder (325 mesh) and white fused alumina sand
(100 mesh), wherein bauxite powder, electro-corundum powder (ratio 1:1) account for 80wt%；The ratio that silica solution is 5g/ml according to powder liquor ratio
Example configuration；MgO accounts for the 2wt% of refractory material；TiO2Account for the 8wt% of refractory material；Silica flour accounts for the 30wt% of refractory material；Boron
Sand accounts for the 2wt% of refractory material；The 15wt% boric anhydride that boric acid accounts for refractory material accounts for the 5wt% of refractory material.
Raw material is uniformly mixed.Raw material powder (in addition to MgO) is put into ball mill and grinds, taken out after stirring 120min；
Mixed-powder is put into blender, silica solution adds several times, and stirring 120min obtains uniform sizing material；It is eventually adding MgO powder
End stirs 60min, obtains uniform sizing material.
Prepare ceramic core just body.The slurry stirred evenly is poured into mold immediately, 200 DEG C of low temperature dryings take afterwards for 24 hours
Out.
Roasting, is placed in Muffle kiln roasting for body at the beginning of above-mentioned ceramic core, obtains high-intensitive ceramic core, roasts item
Part: temperature is 2000 DEG C, time 1h.
Prepare water proof type ceramic core Z, including two processes of waterproof material processing and drying.Waterproof material processing: will be upper
It states high-strength ceramic type core and is placed in waterproof neoprene and impregnate, soaking time 120min.Drying: by it is above-mentioned through waterproof material at
The ceramic core of reason, which is put into Muffle furnace, dries, and obtains water proof type ceramic core Z, drying condition are as follows: temperature is 200 DEG C, the time
For 2h.
Detection:
Be poured casting by pre-buried ceramic core, then remove water proof type ceramic core Z and be observed, the inner cavity of casting at
Function has carved the shape feature of water proof type ceramic core Z again, and through detecting, there is no deformation, it was demonstrated that water proof type ceramic core Z has
The advantage that refractoriness is high, chemical stability is good.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (10)
1. the preparation method of ceramic core, which comprises the following steps:
It chooses refractory material, bonding agent, mineralizer and additive and slurry is made by the mixing of specific proportion；
Slurry is poured into mold, drying and moulding obtains ceramic core just body；
Body at the beginning of ceramic core is put into Muffle kiln roasting, forms ceramic core.
2. the preparation method of ceramic core as described in claim 1, which is characterized in that
In the refractory material of selection, including two kinds of forms of fine powder and coarse powder, wherein fine powder proportion are as follows: 50~90wt%, slightly
Powder proportion is 10~50wt%, and powder particle size is 300~500 mesh, and coarse granularity is 80~300 mesh.
3. the preparation method of ceramic core as described in claim 1, which is characterized in that
The mineralizer includes the one or more of magnesia, titanium oxide, silica flour and borax, specific proportion are as follows:
The ratio of refractory material and bonding agent is 1.5~5g/ml；
Magnesia additional amount accounts for the specific gravity of refractory material: 0.1~2wt%；
Titanium oxide additional amount accounts for the specific gravity of refractory material: 0.1~8wt%；
Silica flour additional amount accounts for the specific gravity of refractory material: 1~30wt%；
Borax additional amount accounts for the specific gravity of refractory material: 0.1~5wt%；
The additional amount of additive accounts for the specific gravity of refractory material: 1~20wt%.
4. the preparation method of ceramic core as described in claim 1, which is characterized in that
The refractory material includes one of bauxite powder, coal gangue powder, electro-corundum powder and white fused alumina sand or a variety of；It is described
Bonding agent is silica solution；The mineralizer includes one of magnesia, titanium oxide, silica flour and borax or a variety of；Additive
Including one or both of boric anhydride, boric acid.
5. the preparation method of ceramic core as described in claim 1, which is characterized in that
The weight ratio of the additive boric acid and boric anhydride composition, boric acid and boric anhydride is 30~300%.
6. the preparation method of ceramic core as described in claim 1, which is characterized in that when mineralizer contains magnesia, system
Include: at the step of slurry
Solid powder in addition to magnesia is uniformly mixed；
Then bonding agent is added in the solid powder of mixing, mixing forms slurry precast body；
Magnesium oxide powder is added in slurry precast body, mixing forms slurry；
When mineralizer does not contain magnesia, the step of slurry is made, includes:
Solid powder in addition to bonding agent is uniformly mixed；
Then bonding agent is added in the solid powder after mixing, mixing forms slurry.
7. the preparation method of ceramic core as described in claim 1, which is characterized in that
Be made ceramic core just body the step of in, drying mode be spontaneously dry or low temperature drying, the time of natural drying be
10min~48h, the temperature of low temperature drying are 40~200 DEG C, the time of low temperature drying are as follows: 30min~for 24 hours；
In the step of ceramic core is made, maturing temperature is 400~2000 DEG C, and the time is 1~5h.
8. a kind of ceramic core of the preparation method preparation as described in any in claim 1~7.
9. a kind of preparation method of water proof type ceramic core, which is characterized in that ceramic core as claimed in claim 8 to be put into
It impregnates, dry, soaking time are as follows: 30~120min in waterproof material；Drying time are as follows: 30~120min, drying temperature are as follows: 40
~200 DEG C.
10. a kind of water proof type ceramic core of preparation method preparation as claimed in claim 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111153629A (en) * | 2020-04-02 | 2020-05-15 | 佛山市恒之芯复合材料有限公司 | Manufacturing process of sintering-free ceramic core |
| CN111978074A (en) * | 2020-07-31 | 2020-11-24 | 西安欧中材料科技有限公司 | Carbon nanotube reinforced porous ceramic core and preparation method thereof |
| CN115385674A (en) * | 2022-09-22 | 2022-11-25 | 中国航发北京航空材料研究院 | Preparation method of high-precision ceramic core |
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