CN108326239A - A kind of easy depoling ceramic core preparation method - Google Patents
A kind of easy depoling ceramic core preparation method Download PDFInfo
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- CN108326239A CN108326239A CN201810171491.4A CN201810171491A CN108326239A CN 108326239 A CN108326239 A CN 108326239A CN 201810171491 A CN201810171491 A CN 201810171491A CN 108326239 A CN108326239 A CN 108326239A
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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
- 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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Abstract
The present invention relates to a kind of preparation methods of easy depoling ceramic core, are mainly used in melted module precise casting technology field.Realize step：(1) preparation of graphite core：A. prepared by slurry；B. it is molded；C. graphite core is burnt into.(2) external coating preparation and hanging：Including coating outside coating outside first layer and the second layer.The preparation process of above-mentioned two coating is：Raw material is put into processing 30min in planetary mills to be uniformly mixed, for use.(3) it is burnt into：Due to graphite core meeting oxidation removal internal in sintering process, while external slurry forms compact outer shell by sintering, therefore loose and porous inner surface, the feature of appearance densification is presented in the structure of ceramic core.The method of the present invention is simply easily realized, the production cost of casting can be effectively reduced, and application prospect is extensive.
Description
Technical field
The present invention relates to a kind of preparation methods of easy depoling ceramic core, are mainly used in melted module precise casting technology neck
Domain.
Background technology
Ceramic core is mainly used for forming the complex precise inner cavity of casting in investment precision casting technology.Casting casting is completed
Afterwards, it generally requires and is removed ceramic core from casting by mechanically or chemically corrosion, to obtain hollow precision castings, this work
Sequence is referred to as depoling.Depoling overlong time, difficulty crosses conference and increases substantially the production cost of casting, it could even be possible to causing to pour
Casting failure.The quality of depoling performance is mainly determined by the internal structure of ceramic core and basis material material.
Invention content
In consideration of it, the present invention provides a kind of novel ceramic core preparation method, pass through the ceramic mould of this method preparation
Core compensates for prior art depoling overlong time, and difficulty is excessive and the defects of cause casting increased production cost.
To achieve the above object, the technical solution adopted by the present invention is：A kind of easy depoling ceramic core preparation method, the party
Method is realized by following step：
(1) preparation of graphite core
A. prepared by slurry
It weighs by weight proportion：325 mesh 10-20% of spherical graphite, 500 mesh 70-80% of spherical graphite, spherical graphite 800
Mesh 5-10%.Above-mentioned spherical graphite powder is put into after mixing in baking oven and dries 12h at 120 DEG C.It weighs by weight proportion：
The above-mentioned spherical graphite powder 60-75% after drying, quartz glass fibre 0.5-2%, mullite fiber 0-1%, ceramic mould
Core plasticizer 24-40%.Batch mixer is warming up to 100 DEG C, ceramic core plasticizer is added will pass through after it is completely melt
The graphite of drying and processing is added portionwise in batch mixer in proportion, is taken out after stirring 4h and obtains graphite core slurry.
The raw material of above-mentioned plasticizer % by weight is prepared：Paraffin 93%, beeswax 5%, polyethylene 2% mix at 130 DEG C
Uniformly, it is spare that plasticizer is made in 325 mesh standard sieves excessively.
B. it is molded
The graphite core slurry prepared is put into ceramic core injection (mo(u)lding) machine and prepares graphite core green compact.
C. graphite core is burnt into
Graphite core green compact are embedded in 200 mesh alumina powders and are roasted, firing temperature is 300-450 DEG C, heating rate 1-
1.5℃/min.The alumina powder that furnace temperature is cooled to 60 DEG C or less surfaces of coming out of the stove and clear up obtains graphite core.
(2) external coating preparation and hanging
Coating outside first layer：Raw material forms：240 mesh fused silica powder 45-55wt%, 325 mesh fused silica powder 20-
30wt%, Ludox 25-40wt%.
Coating outside the second layer：Raw material forms：325 mesh fused silica powders or alumina powder 10-20wt%, 800 mesh quartz
Glass powder or alumina powder 50-60wt%, nano silicon oxide or nano aluminium oxide 0.5-1wt%, Ludox or Aluminum sol 25-
40wt%.
The preparation process of above-mentioned two coating is：Raw material is put into processing 30min in planetary mills to be uniformly mixed, for use.
Graphite core is submerged initially in hanging in coating outside first layer first, taking-up is dried at room temperature for 24 hours, then exists
In air dry oven 3h is dried in 120 DEG C.Next hanging in coating, taking-up outside the second layer is dipped in be dried at room temperature for
24 hours, then 3h is dried in 120 DEG C in air dry oven.The above process is repeated if necessary.
(3) it is burnt into
The graphite core of above-mentioned surface hanging is embedded in 200 mesh alumina powders and is roasted, heating rate is 3-3.5 DEG C/min,
Firing temperature is 1200-1350 DEG C, soaking time 2-4h.After firing, 200 DEG C are cooled to the furnace, open fire door, it is cooling
To 60 DEG C or less kiln discharges, ceramic core is obtained.Since the graphite core inside in sintering process understands oxidation removal, while outer pulp
Material forms compact outer shell through oversintering, therefore loose and porous inner surface, the feature of appearance densification is presented in the structure of ceramic core.
The features of the present invention and advantageous effect
Loose and porous inner surface is presented in ceramic core prepared by the present invention, and the design feature of appearance densification can significantly shorten de-
The core time can significantly reduce depoling difficulty, and method is simply easily realized, the production cost of casting, application prospect can be effectively reduced
Extensively.
Specific implementation mode
Embodiment one
(1) preparation of graphite core
A. prepared by slurry
It weighs by weight proportion：325 mesh 20% of spherical graphite, 500 mesh 70% of spherical graphite, 800 mesh 10% of spherical graphite.
Above-mentioned spherical graphite powder is put into after mixing in baking oven and dries 12h at 120 DEG C.It weighs by weight proportion：Above-mentioned process
Spherical graphite powder 70% after drying, quartz glass fibre 2%, ceramic core plasticizer 28%.Batch mixer is warming up to 100
DEG C, ceramic core plasticizer is added, after it is completely melt, batch mixer will be added portionwise in proportion by the graphite of drying and processing
In, it is taken out after stirring 4h and obtains graphite core slurry.
B. it is molded
The graphite core slurry prepared is put into ceramic core injection (mo(u)lding) machine and prepares graphite core green compact.
C. graphite core is burnt into
Will graphite core green compact be embedded to 200 mesh alumina powders in roast, firing temperature be 450 DEG C, heating rate be 1.5 DEG C/
min.The alumina powder that furnace temperature is cooled to 60 DEG C or less surfaces of coming out of the stove and clear up obtains graphite core.
(2) external coating preparation and hanging
Coating outside first layer：Raw material forms：240 mesh fused silica powder 45wt%, 325 mesh fused silica powder 25wt%,
Ludox 30wt%.
Coating outside the second layer：Raw material forms：325 mesh fused silica powder 10wt%, 800 mesh fused silica powder 60wt%,
Nano silicon oxide 0.5wt%, Ludox 29.5wt%.
The preparation process of above-mentioned two coating is：Raw material is put into processing 30min in planetary mills to be uniformly mixed, for use.
Graphite core is submerged initially in hanging in coating outside first layer first, taking-up is dried at room temperature for 24 hours, then exists
In air dry oven 3h is dried in 120 DEG C.Next hanging in coating, taking-up outside the second layer is dipped in be dried at room temperature for
24 hours, then 3h is dried in 120 DEG C in air dry oven.
(3) it is burnt into
The graphite core of above-mentioned surface hanging is embedded in 200 mesh alumina powders and is roasted, heating rate is 3 DEG C/min, firing
Temperature is 1200 DEG C, soaking time 4h.After firing, 200 DEG C are cooled to the furnace, open fire door, be cooled to 60 DEG C or less
Kiln discharge obtains ceramic core.
Embodiment two
(1) preparation of graphite core
A. prepared by slurry
It weighs by weight proportion：325 mesh 10% of spherical graphite, 500 mesh 80% of spherical graphite, 800 mesh 10% of spherical graphite.
Above-mentioned spherical graphite powder is put into after mixing in baking oven and dries 12h at 120 DEG C.It weighs by weight proportion：Above-mentioned process
Spherical graphite powder 60% after drying, quartz glass fibre 1%, mullite fiber 1%, ceramic core plasticizer 38%.It will mix
Material machine is warming up to 100 DEG C, and ceramic core plasticizer is added, and after it is completely melt, will pass through the graphite of drying and processing in proportion
It is added portionwise in batch mixer, is taken out after stirring 4h and obtain graphite core slurry.
B. it is molded
The graphite core slurry prepared is put into ceramic core injection (mo(u)lding) machine and prepares graphite core green compact.
C. graphite core is burnt into
Will graphite core green compact be embedded to 200 mesh alumina powders in roast, firing temperature be 300 DEG C, heating rate be 1 DEG C/
min.The alumina powder that furnace temperature is cooled to 60 DEG C or less surfaces of coming out of the stove and clear up obtains graphite core.
(2) external coating preparation and hanging
Coating outside first layer：Raw material forms：240 mesh fused silica powder 55wt%, 325 mesh fused silica powder 20wt%,
Ludox 25wt%.
Coating outside the second layer：Raw material forms：325 mesh alumina powder 20wt%, 800 mesh alumina powder 54.5wt% receive
Rice aluminium oxide 0.5wt%, Aluminum sol 25wt%.
The preparation process of above-mentioned two coating is：Raw material is put into processing 30min in planetary mills to be uniformly mixed, for use.
Graphite core is submerged initially in hanging in coating outside first layer first, taking-up is dried at room temperature for 24 hours, then exists
In air dry oven 3h is dried in 120 DEG C.Next hanging in coating, taking-up outside the second layer is dipped in be dried at room temperature for
24 hours, then 3h is dried in 120 DEG C in air dry oven.
(3) it is burnt into
The graphite core of above-mentioned surface hanging is embedded in 200 mesh alumina powders and is roasted, heating rate is 3.5 DEG C/min, is burnt
It is 1350 DEG C at temperature, soaking time 2h.After firing, cool to 200 DEG C with the furnace, open fire door, be cooled to 60 DEG C with
Lower kiln discharge, obtains ceramic core.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modification made by within refreshing and principle, equivalent replacement and improvement etc., should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of easy depoling ceramic core preparation method, this method is realized by following step：
(1) preparation of graphite core
A. prepared by slurry
It weighs by weight proportion：325 mesh 10-20% of spherical graphite, 500 mesh 70-80% of spherical graphite, 800 mesh 5- of spherical graphite
10%, above-mentioned spherical graphite powder is put into after mixing in baking oven and dries 12h at 120 DEG C.It weighs by weight proportion：It is above-mentioned
Spherical graphite powder 60-75% after drying, quartz glass fibre 0.5-2%, mullite fiber 0-1%, ceramic core increase
Agent 24-40% is moulded, batch mixer is warming up to 100 DEG C, ceramic core plasticizer is added, after it is completely melt, drying will be passed through
The graphite of processing is added portionwise in batch mixer in proportion, is taken out after stirring 4h and obtains graphite core slurry；
B. it is molded
The graphite core slurry prepared is put into ceramic core injection (mo(u)lding) machine and prepares graphite core green compact；
C. graphite core is burnt into
Graphite core green compact are embedded in 200 mesh alumina powders and are roasted, firing temperature is 300-450 DEG C, heating rate 1-1.5
DEG C/min, the alumina powder that furnace temperature is cooled to 60 DEG C or less surfaces of coming out of the stove and clear up obtains graphite core；
(2) external coating preparation and hanging
Coating outside first layer：Raw material forms：240 mesh fused silica powder 45-55wt%, 325 mesh fused silica powder 20-
30wt%, Ludox 25-40wt%；
Coating outside the second layer：Raw material forms：325 mesh fused silica powders or alumina powder 10-20wt%, 800 mesh quartz glass
Powder or alumina powder 50-60wt%, nano silicon oxide or nano aluminium oxide 0.5-1wt%, Ludox or Aluminum sol 25-
40wt%；
The preparation process of above-mentioned two coating is：Raw material is put into processing 30min in planetary mills to be uniformly mixed, for use, first
Graphite core is submerged initially in hanging in coating outside first layer, taking-up is dried at room temperature for 24 hours, then in air dry oven
3h are dried in 120 DEG C, are next dipped in hanging in coating outside the second layer, taking-up is dried at room temperature for 24 hours, then
3h is dried in 120 DEG C in air dry oven, repeats the above process if necessary.
(3) it is burnt into
The graphite core of above-mentioned surface hanging is embedded in 200 mesh alumina powders and is roasted, heating rate is 3-3.5 DEG C/min, firing
Temperature is 1200-1350 DEG C, soaking time 2-4h, after firing, cools to 200 DEG C with the furnace, opens fire door, be cooled to 60
DEG C or less kiln discharge, obtain ceramic core.
2. easily depoling ceramic core preparation method, this method as described in claim 1 are realized by following specific steps：
(1) preparation of graphite core
A. prepared by slurry
It weighs by weight proportion：325 mesh 20% of spherical graphite, 500 mesh 70% of spherical graphite, 800 mesh 10% of spherical graphite will be upper
It states spherical graphite powder and is put into after mixing in baking oven and dry 12h at 120 DEG C, weigh by weight proportion：It is above-mentioned to pass through drying
Batch mixer is warming up to 100 DEG C, added by spherical graphite powder 70% afterwards, quartz glass fibre 2%, ceramic core plasticizer 28%
Enter ceramic core plasticizer, after it is completely melt, will be added portionwise in batch mixer, stir in proportion by the graphite of drying and processing
Taking-up obtains graphite core slurry after mixing 4h；
B. it is molded
The graphite core slurry prepared is put into ceramic core injection (mo(u)lding) machine and prepares graphite core green compact；
C. graphite core is burnt into
Graphite core green compact are embedded in 200 mesh alumina powders and are roasted, firing temperature is 450 DEG C, and heating rate is 1.5 DEG C/min,
The alumina powder that furnace temperature is cooled to 60 DEG C or less surfaces of coming out of the stove and clear up obtains graphite core；
(2) external coating preparation and hanging
Coating outside first layer：Raw material forms：240 mesh fused silica powder 45wt%, 325 mesh fused silica powder 25wt%, silicon are molten
Glue 30wt%；
Coating outside the second layer：Raw material forms：325 mesh fused silica powder 10wt%, 800 mesh fused silica powder 60wt%, nanometer
Silica 0.5wt%, Ludox 29.5wt%；
The preparation process of above-mentioned two coating is：Raw material is put into processing 30min in planetary mills to be uniformly mixed, for use, first
Graphite core is submerged initially in hanging in coating outside first layer, taking-up is dried at room temperature for 24 hours, then in air dry oven
3h is dried in 120 DEG C.Next it is dipped in hanging in coating outside the second layer, taking-up is dried at room temperature for 24 hours, then
In air dry oven 3h is dried in 120 DEG C.
(3) it is burnt into
The graphite core of above-mentioned surface hanging is embedded in 200 mesh alumina powders and is roasted, heating rate is 3 DEG C/min, firing temperature
It is 1200 DEG C, soaking time 4h, after firing, cools to 200 DEG C with the furnace, open fire door, be cooled to 60 DEG C or less kiln discharges
Obtain ceramic core；
3. easily depoling ceramic core preparation method, this method as described in claim 1 are realized by following specific steps：
(1) preparation of graphite core
A. prepared by slurry
It weighs by weight proportion：325 mesh 10% of spherical graphite, 500 mesh 80% of spherical graphite, 800 mesh 10% of spherical graphite will be upper
It states spherical graphite powder and is put into after mixing in baking oven and dry 12h at 120 DEG C, weigh by weight proportion：It is above-mentioned to pass through drying
Spherical graphite powder 60% afterwards, quartz glass fibre 1%, mullite fiber 1%, ceramic core plasticizer 38%, by batch mixer
100 DEG C are warming up to, ceramic core plasticizer is added, after it is completely melt, in proportion in batches by the graphite of process drying and processing
It is added in batch mixer, is taken out after stirring 4h and obtain graphite core slurry；
B. it is molded
The graphite core slurry prepared is put into ceramic core injection (mo(u)lding) machine and prepares graphite core green compact；
C. graphite core is burnt into
Graphite core green compact are embedded in 200 mesh alumina powders and are roasted, firing temperature is 300 DEG C, and heating rate is 1 DEG C/min, stove
The alumina powder that temperature is cooled to 60 DEG C or less surfaces of coming out of the stove and clear up obtains graphite core；
(2) external coating preparation and hanging
Coating outside first layer：Raw material forms：240 mesh fused silica powder 55wt%, 325 mesh fused silica powder 20wt%, silicon are molten
Glue 25wt%；
Coating outside the second layer：Raw material forms：325 mesh alumina powder 20wt%, 800 mesh alumina powder 54.5wt%, nano oxygen
Change aluminium 0.5wt%, Aluminum sol 25wt%；
The preparation process of above-mentioned two coating is：Raw material is put into processing 30min in planetary mills to be uniformly mixed, for use, first
Graphite core is submerged initially in hanging in coating outside first layer, taking-up is dried at room temperature for 24 hours, then in air dry oven
3h are dried in 120 DEG C, are next dipped in hanging in coating outside the second layer, taking-up is dried at room temperature for 24 hours, then
In air dry oven 3h is dried in 120 DEG C；
(3) it is burnt into
The graphite core of above-mentioned surface hanging is embedded in 200 mesh alumina powders and is roasted, heating rate is 3.5 DEG C/min, firing temperature
Degree is 1350 DEG C, soaking time 2h；After firing, 200 DEG C are cooled to the furnace, open fire door, be cooled to 60 DEG C or less and go out
Kiln obtains ceramic core.
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| CN201810171491.4A CN108326239A (en) | 2018-03-01 | 2018-03-01 | A kind of easy depoling ceramic core preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109746395A (en) * | 2019-03-06 | 2019-05-14 | 西安交通大学 | A kind of sand core structure being easy to depoling |
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| CN101077836A (en) * | 2007-06-19 | 2007-11-28 | 西安交通大学 | Method for preparing aluminum oxide base ceramic core |
| CN102266906A (en) * | 2010-06-02 | 2011-12-07 | 中国科学院金属研究所 | Preparation method of easy-to-remove ceramic mold core |
| CN105127374A (en) * | 2015-09-10 | 2015-12-09 | 中国航空工业集团公司北京航空材料研究院 | Composite mold core for titanium and titanium alloy casting and preparation method of composite mold core |
| CN105499480A (en) * | 2015-11-30 | 2016-04-20 | 江苏金汇精铸陶瓷股份有限公司 | High-collapsibility ceramic mould core and preparation method thereof |
| CN107640963A (en) * | 2017-10-20 | 2018-01-30 | 东方电气集团东方汽轮机有限公司 | A kind of preparation method of graded ceramicses core material |
-
2018
- 2018-03-01 CN CN201810171491.4A patent/CN108326239A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101077836A (en) * | 2007-06-19 | 2007-11-28 | 西安交通大学 | Method for preparing aluminum oxide base ceramic core |
| CN102266906A (en) * | 2010-06-02 | 2011-12-07 | 中国科学院金属研究所 | Preparation method of easy-to-remove ceramic mold core |
| CN105127374A (en) * | 2015-09-10 | 2015-12-09 | 中国航空工业集团公司北京航空材料研究院 | Composite mold core for titanium and titanium alloy casting and preparation method of composite mold core |
| CN105499480A (en) * | 2015-11-30 | 2016-04-20 | 江苏金汇精铸陶瓷股份有限公司 | High-collapsibility ceramic mould core and preparation method thereof |
| CN107640963A (en) * | 2017-10-20 | 2018-01-30 | 东方电气集团东方汽轮机有限公司 | A kind of preparation method of graded ceramicses core material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109746395A (en) * | 2019-03-06 | 2019-05-14 | 西安交通大学 | A kind of sand core structure being easy to depoling |
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Application publication date: 20180727 |