CN105290335B - A method of improving ceramic core mouldability - Google Patents
A method of improving ceramic core mouldability Download PDFInfo
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- CN105290335B CN105290335B CN201510764828.9A CN201510764828A CN105290335B CN 105290335 B CN105290335 B CN 105290335B CN 201510764828 A CN201510764828 A CN 201510764828A CN 105290335 B CN105290335 B CN 105290335B
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Abstract
The invention belongs to single crystal blade hot investment casting fields, and in particular to a method of improving ceramic core mouldability.The present invention by fused silica powder, zircon flour and 0.5% ~ 5% quartz glass fibre be chopped pompon mill be mixed to get mixture, it adds mixture into the plasticizer dissolved, stirring at least 20 hours, ceramic core slurry is obtained, core is suppressed on core press injector, mold temperature is 25 DEG C ~ 30 DEG C and obtains labyrinth ceramic core, or mold is preheated to 38 DEG C ~ 42 DEG C, 1 ~ 3Mpa of Pressure Casting, pressurize 50s obtain 0.3mm thickness exhaust seam ceramic core.The present invention makes the raising of flowability of ceramic core slurry, realize the compression moulding under the room temperature mold temperature state of labyrinth ceramic core, keep core completely cooling in a mold, deformation of the core in molding and placement can be prevented, can realize compression moulding of the 0.3mm thickness exhaust seam core under 35 DEG C ~ 42 DEG C mold temperature states.
Description
Technical field
The invention belongs to single crystal blade hot investment casting fields, and in particular to a method of improving ceramic core mouldability.
Background technology
Currently used labyrinth ceramic core routine pressing process is heating mould to 40 DEG C ~ 45 DEG C → compacting core
→ orthotics are corrected.But since flowability of ceramic core slurry is poor, in order to make labyrinth ceramic core compression moulding, lead to
Mold is often heated to 40 DEG C ~ 45 DEG C, causes ceramic core slurry that cannot cool down completely in a mold, is generated in molding
Stress causes the plastic deformation of ceramic core.Although orthotics can reach certain orthopedic effect, often not ideal enough, and right
The ceramic core that only 0.3mm thickness is stitched in exhaust is even more to be difficult to be molded.
And the method for traditional improvement flowability of ceramic core slurry is to use more coarse grained matrix powder, is not being reduced
Under the premise of plasticizer addition, increase its mobility by increasing the dilution of core slurry, core hygrometric state is necessarily brought to suppress
The increase that grade firing is shunk is shunk, and the increasing degree of its mobility is also limited, generally within 15%.
Invention content
In view of the problems of the existing technology, the present invention provides a kind of method improving ceramic core mouldability, it is therefore an objective to
The mobility of ceramic core slurry is improved, realizes that labyrinth ceramic core is pressed into the case where mold temperature is normal temperature state
Type, to solve the problems, such as the compacting deformation of labyrinth ceramic core；It can also realize that 0.3mm thickness is vented seam type under low-temperature condition
The compression moulding of core meets the needs of thin-walled thickness single crystal blade development.
Realize that the technical solution of the object of the invention follows the steps below:
（1）Prepare ceramic core slurry：According to weight percent, by 40% ~ 50% F220 fused silica powders, 20 ~ 30%
The chopped silk of F600 fused silica powders, 30% zircon flour and 0.5% ~ 5% quartz glass fibre is placed in ball grinder, ball milling mixing 2
~ 2.5 hours, obtain mixture；The plasticizer for accounting for mixture weight 17% ~ 22% is added in blender, be heated to 110 DEG C ~
It 120 DEG C, adds mixture into the plasticizer dissolved, stirs at least 20 hours, obtain ceramic core slurry；
（2）Core is suppressed on core press injector, ceramic core slurry material feeding temperature is 95 DEG C ~ 105 DEG C, and mold temperature is
25 DEG C ~ 30 DEG C, 1 ~ 3Mpa of Pressure Casting, pressurize 50s obtain labyrinth ceramic core；Or mold is preheated to 38 DEG C ~ 42
DEG C, 1 ~ 3Mpa of Pressure Casting, pressurize 50s obtain 0.3mm thickness exhaust seam ceramic core.
Wherein, chopped a diameter of 8 μm ~ 10 μm of the silk of the quartz glass fibre, length 1mm ~ 3mm.
Compared with prior art, the features of the present invention and advantageous effect are：
The present invention improves ceramic core slurry by the chopped silk of the quartz glass fibre that 0.5% ~ 5% is added in the feed
Mouldability makes its mobility increasing degree at 1 times or more, and the mobility of slurry is increased to by 190 ° in the prior art ~ 220 °
380°~460°；
Since quartz glass fibre is chopped the addition of silk, the increase of plasticizer addition in raw material can be brought, but not increase
Add the dilution of core slurry, the high-temperature behavior of core will not be reduced, the firing that will not increase core is shunk；
The raising of flowability of ceramic core slurry, under the room temperature mold temperature state that can realize labyrinth ceramic core
Compression moulding, keep core completely cooling in a mold, deformation of the core in molding and placement can be prevented, can be realized
Compression moulding of the 0.3mm thickness exhaust seam core under 35 DEG C ~ 42 DEG C mold temperature states.
Description of the drawings
Fig. 1 is the mold schematic diagram tested flowability of ceramic core slurry in the embodiment of the present invention.
Specific implementation mode
The detection method of slurry fluidity there is no national standard at present, for flowability of ceramic core slurry in the present invention
Detecting the method used is：The pressure for applying 2.5MPa on core press injector, would be heated to 100 DEG C ± 5 DEG C of core slurry
Be pressed into core slurry fluidity testing mould, be in the core slurry fluidity testing mould sliver transvers section be 1mm
The involute of diameter semicircle, as shown in Figure 1, filling the angle of involute rotated with ceramic core slurry to demarcate its flowing
Property, angle is bigger, and mobility is better.
Embodiment 1
The method of the improvement ceramic core mouldability of the present embodiment follows the steps below：
（1）Prepare ceramic core slurry：According to weight percent, by 40% F220 fused silica powders, 25% F600 stones
The chopped silk of English glass powder, 30% zircon flour and 5% quartz glass fibre is placed in ball grinder, and the chopped silk of quartz glass fibre is straight
Diameter is 8 μm ~ 10 μm, length 1mm ~ 3mm, and ball milling mixing 2 hours obtains mixture；The plasticizer for accounting for mixture weight 20% is added
Enter into blender, be heated to 110 DEG C, add mixture into the plasticizer dissolved, stirs 20 hours, obtain ceramic core
Slurry；
（2）Core is suppressed on core press injector, ceramic core slurry material feeding temperature is 105 DEG C, and mold temperature is 28 DEG C,
Pressure Casting 1Mpa, pressurize 50s obtain labyrinth ceramic core.
Embodiment 2
The method of the improvement ceramic core mouldability of the present embodiment follows the steps below：
（1）Prepare ceramic core slurry：According to weight percent, by 45% F220 fused silica powders, 22.5% F600
The chopped silk of fused silica powder, 30% zircon flour and 2.5% quartz glass fibre is placed in ball grinder, and quartz glass fibre is chopped
A diameter of 8 μm ~ 10 μm, length 1mm ~ 3mm of silk, ball milling mixing 2.5 hours obtains mixture；The increasing of mixture weight 22% will be accounted for
Modeling agent is added in blender, is heated to 120 DEG C, is added mixture into the plasticizer dissolved, is stirred 24 hours, is made pottery
Porcelain core slurry；
（2）Core is suppressed on core press injector, ceramic core slurry material feeding temperature is 95 DEG C, and mold temperature is 30 DEG C,
Pressure Casting 3Mpa, pressurize 50s obtain labyrinth ceramic core.
Embodiment 3
The method of the improvement ceramic core mouldability of the present embodiment follows the steps below：
（1）Prepare ceramic core slurry：According to weight percent, by 49.5% F220 fused silica powders, 20% F600
The chopped silk of fused silica powder, 30% zircon flour and 0.5% quartz glass fibre is placed in ball grinder, and quartz glass fibre is chopped
A diameter of 8 μm ~ 10 μm, length 1mm ~ 3mm of silk, ball milling mixing 2.5 hours obtains mixture；The increasing of mixture weight 17% will be accounted for
Modeling agent is added in blender, is heated to 115 DEG C, is added mixture into the plasticizer dissolved, is stirred 25 hours, is made pottery
Porcelain core slurry；
（2）Core is suppressed on core press injector, ceramic core slurry material feeding temperature is 100 DEG C, and mold temperature is 25 DEG C,
Pressure Casting 2Mpa, pressurize 50s obtain labyrinth ceramic core.
Embodiment 4
The method of the improvement ceramic core mouldability of the present embodiment follows the steps below：
（1）Prepare ceramic core slurry：According to weight percent, by 42% F220 fused silica powders, 23% F600 stones
The chopped silk of English glass powder, 30% zircon flour and 5% quartz glass fibre is placed in ball grinder, and the chopped silk of quartz glass fibre is straight
Diameter is 8 μm ~ 10 μm, length 1mm ~ 3mm, and ball milling mixing 2 hours obtains mixture；The plasticizer for accounting for mixture weight 18% is added
Enter into blender, be heated to 118 DEG C, add mixture into the plasticizer dissolved, stirs 20 hours, obtain ceramic core
Slurry；
（2）Core is suppressed on core press injector, ceramic core slurry material feeding temperature is 100 DEG C, and mold is preheated to 38
DEG C, Pressure Casting 2Mpa, pressurize 50s obtain 0.3mm thickness exhaust seam ceramic core.
Embodiment 5
The method of the improvement ceramic core mouldability of the present embodiment follows the steps below：
（1）Prepare ceramic core slurry：According to weight percent, by 40% F220 fused silica powders, 28.5% F600
The chopped silk of fused silica powder, 30% zircon flour and 1.5% quartz glass fibre is placed in ball grinder, and quartz glass fibre is chopped
A diameter of 8 μm ~ 10 μm, length 1mm ~ 3mm of silk, ball milling mixing 2.5 hours obtains mixture；The increasing of mixture weight 20% will be accounted for
Modeling agent is added in blender, is heated to 120 DEG C, is added mixture into the plasticizer dissolved, is stirred 20 hours, is made pottery
Porcelain core slurry；
（2）Core is suppressed on core press injector, ceramic core slurry material feeding temperature is 105 DEG C, and mold is preheated to 40
DEG C, Pressure Casting 1Mpa, pressurize 50s obtain 0.3mm thickness exhaust seam ceramic core.
Embodiment 6
The method of the improvement ceramic core mouldability of the present embodiment follows the steps below：
（1）Prepare ceramic core slurry：According to weight percent, by 45% F220 fused silica powders, 24% F600 stones
The chopped silk of English glass powder, 30% zircon flour and 1% quartz glass fibre is placed in ball grinder, and the chopped silk of quartz glass fibre is straight
Diameter is 8 μm ~ 10 μm, length 1mm ~ 3mm, and ball milling mixing 2 hours obtains mixture；The plasticizer for accounting for mixture weight 21% is added
Enter into blender, be heated to 110 DEG C, add mixture into the plasticizer dissolved, stirs 24 hours, obtain ceramic core
Slurry；
（2）Core is suppressed on core press injector, ceramic core slurry material feeding temperature is 95 DEG C, and mold is preheated to 42
DEG C, Pressure Casting 3Mpa, pressurize 50s obtain 0.3mm thickness exhaust seam ceramic core.
Claims (1)
1. a kind of method improving ceramic core mouldability, it is characterised in that follow the steps below：
(1) ceramic core slurry is prepared：According to weight percent, by 40%~50% F220 fused silica powders, 20~30%
F600 fused silica powders, 30% zircon flour and 0.5%~5% the quartz glass fibre silk that is chopped be placed in ball grinder, ball
Mill mixing 2~2.5 hours, obtains mixture, and the quartz glass fibre is chopped a diameter of 8 μm~10 μm of silk, and length 1mm~
3mm；The plasticizer for accounting for mixture weight 17%~22% is added in blender, 110 DEG C~120 DEG C is heated to, will mix
Material is added in the plasticizer dissolved, is stirred at least 20 hours, is obtained ceramic core slurry；
(2) core is suppressed on core press injector, ceramic core slurry material feeding temperature is 95 DEG C~105 DEG C, mold temperature 25
DEG C~30 DEG C, 1~3Mpa of Pressure Casting, pressurize 50s obtain labyrinth ceramic core；Or by mold be preheated to 38 DEG C~
42 DEG C, 1~3Mpa of Pressure Casting, pressurize 50s, obtain 0.3mm thickness exhaust seam ceramic core.
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| CN107127302A (en) * | 2017-04-01 | 2017-09-05 | 东风精密铸造安徽有限公司 | A kind of Coremaker skill of moltening mold castings |
| CN109500983B (en) * | 2018-11-23 | 2020-09-25 | 东方电气集团东方汽轮机有限公司 | Ceramic core cooling mould and biscuit shape correcting method |
| CN115196981B (en) * | 2022-08-02 | 2023-02-28 | 西北工业大学 | Silica-based ceramic core and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527937A (en) * | 2012-03-15 | 2012-07-04 | 哈尔滨工业大学 | Method for preparing fiber-reinforced thin-wall shell for casting titanium alloy smelting mold |
| CN102836962A (en) * | 2012-07-30 | 2012-12-26 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for improving flowability of ceramic core slurry |
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| CN100334033C (en) * | 2005-11-29 | 2007-08-29 | 辽宁省轻工科学研究院 | Ceramic core material by composited inorganic fibre |
| CN102873276A (en) * | 2012-10-24 | 2013-01-16 | 山东理工大学 | Technology for producing casting core |
| CN103170578A (en) * | 2013-03-14 | 2013-06-26 | 山东理工大学 | Ceramic type precise casting method |
| CN104446388B (en) * | 2014-11-10 | 2016-06-22 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of method improving aluminium oxide core slurry fluidity |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527937A (en) * | 2012-03-15 | 2012-07-04 | 哈尔滨工业大学 | Method for preparing fiber-reinforced thin-wall shell for casting titanium alloy smelting mold |
| CN102836962A (en) * | 2012-07-30 | 2012-12-26 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for improving flowability of ceramic core slurry |
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Address after: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee after: Chinese Hangfa Shenyang Liming Aero engine limited liability company Address before: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee before: Liming Aeroplane Engine (Group) Co., Ltd., Shenyang City |
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