CN102407291B - Method for manufacturing ceramic cores through two-stage burying sintering - Google Patents
Method for manufacturing ceramic cores through two-stage burying sintering Download PDFInfo
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- CN102407291B CN102407291B CN201110399468.9A CN201110399468A CN102407291B CN 102407291 B CN102407291 B CN 102407291B CN 201110399468 A CN201110399468 A CN 201110399468A CN 102407291 B CN102407291 B CN 102407291B
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- Prior art keywords
- waxing
- ceramic core
- filler special
- filler
- sintering
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- 239000000919 ceramic Substances 0.000 title claims abstract description 65
- 238000005245 sintering Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000004018 waxing Methods 0.000 claims abstract description 74
- 239000000945 filler Substances 0.000 claims abstract description 62
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 5
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 27
- 239000000843 powder Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 2
- 238000012797 qualification Methods 0.000 abstract description 2
- 229940024548 aluminum oxide Drugs 0.000 abstract 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 abstract 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 239000004014 plasticizer Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000005495 investment casting Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a method for manufacturing ceramic cores through two-stage burying sintering. Aiming at the special requirements of a de-waxing stage and a sintering stage in the process of burying sintering, a two-stage burying sintering method is adopted, and different fillers are respectively adopted in each stage. In the invention, a special filler for de-waxing can be aluminum oxide, magnesium oxide or silicon dioxide; and a special filler for final sintering is aluminum oxide. The preparation method for ceramic cores comprises the following steps: embedding a green ceramic core blank into the special filler for de-waxing, then putting the green ceramic core blank in an oven or a de-waxing furnace to carry out de-waxing; after the de-waxing operation is completed, cooling to room temperature, then, taking out the obtained ceramic core, and embedding the ceramic core into the special filler for final sintering; then rapidly sintering the ceramic core in a ceramic-core roasting furnace so as to obtain a finished ceramic core. According to the method disclosed by the invention, in the process of de-waxing, because of the characteristics that the adsorbability of the filler is good and the de-waxing temperature is low, the defects such as bulging, sinking and wax flowing and the like are effectively reduced; meanwhile, because a special high-purity aluminum-oxide filler is adopted in the process of final sintering, and the Na2O content of the filler is strictly controlled, the final sintering qualification rate and product performance of the ceramic core are greatly improved.
Description
Technical field
The present invention relates to a kind of manufacture method of ceramic core, be exactly a kind of two sections and bury the manufacture methods of burning ceramic core, belong to the precision-investment casting field.
Background technology
In precision-investment casting, the operations such as the coating of the core cavity routine that complexity is narrow is coated with, stucco can't be implemented at all, must adopt prefabricated ceramic core to form.Ceramic core is mainly used to form the cavity shape of complex parts.Ceramic core is with selected matrix material, mineralizer and plasticizer, stirs under heated condition and is made into uniform slurry, then is pressed into core sample or part green compact according to required form and size in some way on hydraulic press.Different from common ceramic, ceramic core burn till the mode bury burning that adopts: be about to the ceramic core green compact and imbed and contain in Packed saggar, then bury burning by predetermined technique in special-purpose kiln and form.Burning till is one of sport technique segment of most critical in the ceramic core production technology.The burying burning and can be divided into de-waxing and two stages of sintering of ceramic core base substrate.For simplification of flowsheet, ceramic core burns till common employing single firing process.But due to de-waxing and sintering stage, filler there are different requirements, as: the stage of burning till is normal temperature to 600 ℃ to the temperature range of de-waxing requirement, purpose is that plasticizer in the Tao Xin base substrate is discharged smoothly, and will try one's best carefully to the granularmetric composition that requires of carrier performance, ability to obtain to adsorb more by force plasticizer does not react.And to the temperature range that the sintering stage requires be 600 ℃ to burning eventually temperature, moderate for obtaining enough intensity and good its granularmetric composition of high-temperature comprehensive property, filler itself does not undergo phase transition or sintering, with the Tao Xin reaction, impurity content (Na particularly
2O content) must strictly control.Based on the different requirements to temperature and carrier performance of de-waxing and sintering, adopt once-firing to cause sintering qualified rate on the low side.
Summary of the invention
The objective of the invention is to make up above-mentioned the deficiencies in the prior art, for burying de-waxing and the specific (special) requirements in sintering stage in the burning process, adopt two sections to bury burning method and every section and adopt respectively different fillers, and worked out corresponding de-waxing (binder burnout temperature is controlled at below 250 ℃) and burnt eventually calcining system, satisfy simultaneously the needs of de-waxing and sintering, greatly improved the sintering qualified rate of ceramic core.
For achieving the above object, the present invention adopts following technical proposals: a kind of two sections are buried the manufacture methods of burning ceramic core, and related de-waxing filler special in the method can adopt aluminium oxide or magnesia or silica; Granularity requirements is crossed 400 mesh standard sieves, gets the lower part of screen and divides as the de-waxing filler special and use.Burn eventually filler special, adopt aluminium oxide, composition requires: purity 〉=99%, Na
2O content≤0.1%; Granularity requirements is crossed 140 orders and 240 mesh standard sieves, gets mid portion as burning eventually filler special.
Its preparation method is as follows: the ceramic core green compact are imbedded the de-waxing filler special, then put into baking oven or wax expelling furnace de-waxing, de-waxing stage maximum temperature is 180-250 ℃, 8-16 hour de-waxing time.After the complete cool to room temperature of de-waxing, ceramic core is taken out, imbed and burn eventually in filler special, Fast Sintering in the ceramic core roaster then, programming rate 5-10 ℃/min, sintering temperature is 1140-1300 ℃, makes ceramic core.
Ceramic core manufacture method provided by the invention in the de-waxing process, owing to having the characteristics such as filling adsorption is good, binder burnout temperature is low, has effectively reduced the defectives such as bulge, depression, stream wax.Simultaneously owing to having adopted high-purity special aluminium oxide filler in the whole burning stage, and strictly control Na in filler
2The content of O, that has greatly improved ceramic core burns eventually qualification rate and product properties.
The specific embodiment
Embodiment one
A kind of two sections are buried the manufacture method of burning ceramic core, and de-waxing filler special related in the method adopts aluminium oxide, crosses 400 mesh standard sieves, gets the lower part of screen and divides as the de-waxing filler special.Burn eventually filler special and adopt high-purity alumina powder: purity 99.7%, Na
2O content 0.04% is crossed 140 orders and 240 mesh standard sieves, gets mid portion as burning eventually filler special.The ceramic core green compact are imbedded the de-waxing filler special, then put into the baking oven de-waxing, de-waxing stage maximum temperature is 180 ℃, 10 hours de-waxing time.After the complete cool to room temperature of de-waxing, ceramic core is taken out, imbed and burn eventually in filler special, Fast Sintering in the ceramic core roaster then, 5 ℃/min of programming rate, sintering temperature is 1150 ℃, makes ceramic core.
Embodiment two
A kind of two sections are buried the manufacture method of burning ceramic core, and de-waxing filler special related in the method adopts magnesia, crosses 400 mesh standard sieves, gets the lower part of screen and divides as the de-waxing filler special.Burn eventually filler special and adopt high-purity alumina powder: purity 99.0%, Na
2O content 0.02% is crossed 140 orders and 240 mesh standard sieves, gets mid portion as burning eventually filler special.The ceramic core green compact are imbedded the de-waxing filler special, then put into the baking oven de-waxing, de-waxing stage maximum temperature is 200 ℃, 14 hours de-waxing time.After the complete cool to room temperature of de-waxing, ceramic core is taken out, imbed and burn eventually in filler special, Fast Sintering in the ceramic core roaster then, 6 ℃/min of programming rate, sintering temperature is 1200 ℃, makes ceramic core.
Embodiment three
A kind of two sections are buried the manufacture method of burning ceramic core, and de-waxing filler special related in the method adopts silica, crosses 400 mesh standard sieves, gets the lower part of screen and divides as the de-waxing filler special.Burn eventually filler special and adopt high-purity alumina powder: purity 99.0%, Na
2O content 0.016% is crossed 140 orders and 240 mesh standard sieves, gets mid portion as burning eventually filler special.The ceramic core green compact are imbedded the de-waxing filler special, then put into low temperature wax expelling furnace de-waxing, de-waxing stage maximum temperature is 250 ℃, 16 hours de-waxing time.After the complete cool to room temperature of de-waxing, ceramic core is taken out, imbed and burn eventually in filler special, Fast Sintering in the ceramic core roaster then, 10 ℃/min of programming rate, sintering temperature is 1300 ℃, makes ceramic core.
Claims (4)
1. one kind two sections are buried the manufacture method of burning ceramic core, adopt two sections to bury burning method and every section and adopt respectively different fillers, and worked out corresponding de-waxing and burnt eventually calcining system, the needs of de-waxing and sintering have been satisfied simultaneously, related de-waxing filler special in said method adopts aluminium oxide or magnesia or silica; Granularity requirements is crossed 400 mesh standard sieves, gets the lower part of screen and divides as the de-waxing filler special and use; Burn eventually filler special, adopt aluminium oxide, composition requires: purity 〉=99%, Na
2O content≤0.1%; Granularity requirements is crossed 140 orders and 240 mesh standard sieves, get mid portion as burning eventually filler special, its preparation method: the ceramic core green compact are imbedded the de-waxing filler special, then put into baking oven or wax expelling furnace de-waxing, de-waxing stage maximum temperature is 180-250 ℃, 8-16 hour de-waxing time, after the complete cool to room temperature of de-waxing, ceramic core is taken out, imbed and burn eventually in filler special, Fast Sintering in the ceramic core roaster then, programming rate 5-10 ℃/min, sintering temperature is 1140-1300 ℃, makes ceramic core.
2. a kind of two sections as claimed in claim 1 are buried the manufacture method of burning ceramic core, and de-waxing filler special related in the method adopts aluminium oxide, crosses 400 mesh standard sieves, gets the lower part of screen and divides as the de-waxing filler special; Burn eventually filler special and adopt high-purity alumina powder: purity 99.7%, Na
2O content 0.04% is crossed 140 orders and 240 mesh standard sieves, gets mid portion as burning eventually filler special, the ceramic core green compact are imbedded above-mentioned de-waxing filler special, then put into the baking oven de-waxing, de-waxing stage maximum temperature is 180 ℃, 10 hours de-waxing time, after the complete cool to room temperature of de-waxing, ceramic core is taken out, imbed in the above-mentioned filler special of burning eventually, then Fast Sintering in the ceramic core roaster, 5 ℃/min of programming rate, sintering temperature is 1150 ℃, makes ceramic core.
3. a kind of two sections as claimed in claim 1 are buried the manufacture method of burning ceramic core, and de-waxing filler special related in the method adopts magnesia, crosses 400 mesh standard sieves, gets the lower part of screen and divides as the de-waxing filler special; Burn eventually filler special and adopt high-purity alumina powder: purity 99.0%, Na
2O content 0.02% is crossed 140 orders and 240 mesh standard sieves, gets mid portion as burning eventually filler special, the ceramic core green compact are imbedded above-mentioned de-waxing filler special, then put into the baking oven de-waxing, de-waxing stage maximum temperature is 200 ℃, 14 hours de-waxing time, after the complete cool to room temperature of de-waxing, ceramic core is taken out, imbed above-mentioned burning eventually in filler special, then Fast Sintering in the ceramic core roaster, 6 ℃/min of programming rate, sintering temperature is 1200 ℃, makes ceramic core.
4. a kind of two sections as claimed in claim 1 are buried the manufacture method of burning ceramic core, and de-waxing filler special related in the method adopts silica, crosses 400 mesh standard sieves, gets the lower part of screen and divides as the de-waxing filler special; Burn eventually filler special and adopt high-purity alumina powder: purity 99.0%, Na
2O content 0.016%, cross 140 orders and 240 mesh standard sieves, get mid portion as burning eventually filler special, the ceramic core green compact are imbedded above-mentioned de-waxing filler special, then put into low temperature wax expelling furnace de-waxing, de-waxing stage maximum temperature is 250 ℃, 16 hours de-waxing time, after the complete cool to room temperature of de-waxing, ceramic core is taken out, imbed above-mentioned burning eventually in filler special, then Fast Sintering in the ceramic core roaster, 10 ℃/min of programming rate, sintering temperature is 1300 ℃, makes ceramic core.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110399468.9A CN102407291B (en) | 2011-12-06 | 2011-12-06 | Method for manufacturing ceramic cores through two-stage burying sintering |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110399468.9A CN102407291B (en) | 2011-12-06 | 2011-12-06 | Method for manufacturing ceramic cores through two-stage burying sintering |
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| CN102407291A CN102407291A (en) | 2012-04-11 |
| CN102407291B true CN102407291B (en) | 2013-06-05 |
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| CN201110399468.9A Withdrawn - After Issue CN102407291B (en) | 2011-12-06 | 2011-12-06 | Method for manufacturing ceramic cores through two-stage burying sintering |
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| CN102815940A (en) * | 2012-08-29 | 2012-12-12 | 天津大学 | Calcium oxide and zirconium oxide composite ceramic core for niobium-silicon based alloy investment casting |
| CN104043770B (en) * | 2014-06-10 | 2017-01-04 | 中国科学院金属研究所 | A kind of sintering ceramic mold core filler powder |
| 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 |
| CN107473751B (en) * | 2017-07-27 | 2019-10-25 | 佛山市非特新材料有限公司 | A kind of production method of two-part sintering ceramic mold core |
| CN107999702B (en) * | 2017-12-22 | 2020-04-14 | 东方电气集团东方汽轮机有限公司 | Ceramic core sintering molding process |
| CN108275988B (en) * | 2018-03-01 | 2021-01-15 | 辽宁航安特铸材料有限公司 | Improved preparation method of silicon-based ceramic core |
| CN109456040A (en) * | 2018-12-05 | 2019-03-12 | 无锡市杰美特科技有限公司 | A kind of ceramic frame of the low deformation of high temperature resistant |
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| JPH10277704A (en) * | 1997-04-09 | 1998-10-20 | Akio Nishihara | Metal injection-forming method with placed core |
| CN1182073C (en) * | 2002-09-30 | 2004-12-29 | 闻本良 | Injection formation technology for silicon carbide |
| CN101229975A (en) * | 2008-01-04 | 2008-07-30 | 西北工业大学 | Method for making alumina ceramic core and core leach method |
| CN101597167A (en) * | 2009-06-22 | 2009-12-09 | 河南长兴实业有限公司 | A kind of novel wax removing powder and manufacture method thereof |
| CN102079653B (en) * | 2010-12-06 | 2013-05-08 | 北京航空航天大学 | Method for producing silicon-based ceramic core for aircraft engine blade |
| CN102173819B (en) * | 2011-02-21 | 2013-07-17 | 辽宁瑛冠高技术陶瓷有限公司 | Preparation method of electric vacuum ceramic tube shell |
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Effective date of registration: 20160920 Address after: 110164 Liaoning city of Shenyang province Shenbei New Area Huishan Street No. 123-20 Patentee after: LIAONING HANGAN SPECIAL CASTING MATERIAL CO., LTD. Address before: 110164 Liaoning city of Shenyang province Shenbei New Area Huishan Street No. 123-20 Patentee before: Liaoning Suhang Special Cast Material Co., Ltd. |
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Address after: 110164 No. 123-19, Huishan street, shenbeixin District, Shenyang City, Liaoning Province Patentee after: Liaoning Hangan core technology Co.,Ltd. Address before: No. 123-20, Huishan street, Shenbei New District, Shenyang City, Liaoning Province Patentee before: LIAONING HANGAN SPECIAL CASTING MATERIAL Co.,Ltd. |
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Granted publication date: 20130605 Effective date of abandoning: 20210926 |
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