CN102407291A - 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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- CN102407291A CN102407291A CN2011103994689A CN201110399468A CN102407291A CN 102407291 A CN102407291 A CN 102407291A CN 2011103994689 A CN2011103994689 A CN 2011103994689A CN 201110399468 A CN201110399468 A CN 201110399468A CN 102407291 A CN102407291 A CN 102407291A
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- 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 22
- 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 63
- 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 39
- 238000013459 approach Methods 0.000 claims description 12
- 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
- 238000005516 engineering process Methods 0.000 description 3
- 239000004014 plasticizer Substances 0.000 description 3
- 239000011230 binding agent Substances 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
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 manufacturing approach of ceramic core, exactly be a kind of two sections and bury the manufacturing approach of burning ceramic core, belong to the precision-investment casting field.
Background technology
In precision-investment casting, the complicated narrow conventional coating of core cavity is coated with operations such as extension, stucco and can't implements at all, must adopt prefabricated ceramic core to form.Ceramic core mainly is used for forming the cavity shape of complex parts.Ceramic core is with selected matrix material, mineralizer and plasticizer, under heated condition, stirs and is made into uniform slurry, on hydraulic press, is pressed into core sample or part green compact with certain mode according to required form and size then.Different with common ceramic, ceramic core burn till the mode bury burning that adopts: be about to the ceramic core green compact and imbed in the saggar that fills filler, in special-purpose kiln, bury burning then and form by predetermined technology.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.In order to simplify technological process, ceramic core burns till common employing single firing process.But because de-waxing and sintering stage; Filler there is demands of different; As: the stage of burning till is a normal temperature to 600 ℃ to the temperature range of de-waxing requirement, and 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 plasticizer does not more by force react.And to the temperature range that the sintering stage requires be 600 ℃ to burning temperature eventually, moderate for obtaining enough intensity and its granularmetric composition of excellent high-temperature combination property, filler itself does not undergo phase transition or sintering, does not react impurity content (Na particularly with Tao Xin
2O content) must strict control.Based on de-waxing and sintering demands of different, adopt once-firing to cause sintering qualified rate on the low side to temperature and carrier performance.
Summary of the invention
The objective of the invention is to remedy the deficiency of above-mentioned prior art; To burying the 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 different fillers respectively; And worked out corresponding de-waxing (binder burnout temperature is controlled at below 250 ℃) and burnt calcining system eventually, satisfied the needs of de-waxing and sintering simultaneously, improved the sintering qualified rate of ceramic core greatly.
Be to realize above-mentioned purpose, the present invention adopts following technical proposals: a kind of two sections are buried the manufacturing approaches of burning ceramic core, and related de-waxing filler special in this method can adopt aluminium oxide or magnesia or silica; Granularity requirements is crossed 400 mesh standard sieves, gets the lower part of screen branch and uses as the de-waxing filler special.Burn filler special eventually, 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 filler special eventually.
Its preparation method is following: the ceramic core green compact are imbedded the de-waxing filler special, put into baking oven or wax expelling furnace de-waxing then, de-waxing stage maximum temperature is 180-250 ℃, 8-16 hour de-waxing time.De-waxing finishes behind the cool to room temperature, and ceramic core is taken out, and imbed and burn eventually in the 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 manufacturing approach provided by the invention in the de-waxing process, owing to have characteristics such as filling adsorption property is good, binder burnout temperature is low, has effectively reduced defectives such as bulge, depression, stream wax.Simultaneously owing to adopted high-purity special aluminium oxide filler in the whole burning stage, and Na in the strict control filler
2The content of O, that has improved ceramic core greatly burns eventually qualification rate and product properties.
The specific embodiment
Embodiment one
A kind of two sections are buried the manufacturing approach of burning ceramic core, and de-waxing filler special related in this method adopts aluminium oxide, crosses 400 mesh standard sieves, gets the lower part of screen branch as the de-waxing filler special.Burn filler special eventually and adopt the high purity aluminium oxide powder: purity 99.7%, Na
2O content 0.04% is crossed 140 orders and 240 mesh standard sieves, gets mid portion as burning filler special eventually.The ceramic core green compact are imbedded the de-waxing filler special, put into the baking oven de-waxing then, de-waxing stage maximum temperature is 180 ℃, 10 hours de-waxing time.De-waxing finishes behind the cool to room temperature, and ceramic core is taken out, and imbed and burn eventually in the 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 manufacturing approach of burning ceramic core, and de-waxing filler special related in this method adopts magnesia, crosses 400 mesh standard sieves, gets the lower part of screen branch as the de-waxing filler special.Burn filler special eventually and adopt the high purity aluminium oxide powder: purity 99.0%, Na
2O content 0.02% is crossed 140 orders and 240 mesh standard sieves, gets mid portion as burning filler special eventually.The ceramic core green compact are imbedded the de-waxing filler special, put into the baking oven de-waxing then, de-waxing stage maximum temperature is 200 ℃, 14 hours de-waxing time.De-waxing finishes behind the cool to room temperature, and ceramic core is taken out, and imbed and burn eventually in the 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 manufacturing approach of burning ceramic core, and de-waxing filler special related in this method adopts silica, crosses 400 mesh standard sieves, gets the lower part of screen branch as the de-waxing filler special.Burn filler special eventually and adopt the high purity aluminium oxide powder: purity 99.0%, Na
2O content 0.016% is crossed 140 orders and 240 mesh standard sieves, gets mid portion as burning filler special eventually.The ceramic core green compact are imbedded the de-waxing filler special, put into low temperature wax expelling furnace de-waxing then, de-waxing stage maximum temperature is 250 ℃, 16 hours de-waxing time.De-waxing finishes behind the cool to room temperature, and ceramic core is taken out, and imbed and burn eventually in the 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 manufacturing approach of burning ceramic core; Adopt two sections to bury burning method and every section and adopt different fillers respectively; And worked out corresponding de-waxing and burnt calcining system eventually; Satisfied the needs of de-waxing and sintering simultaneously, related de-waxing filler special in the said method can adopt aluminium oxide or magnesia or silica; Granularity requirements is crossed 400 mesh standard sieves, gets the lower part of screen branch and uses as the de-waxing filler special; Burn filler special eventually, 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 filler special, its preparation method: the ceramic core green compact are imbedded the de-waxing filler special eventually; Put into baking oven or wax expelling furnace de-waxing then, de-waxing stage maximum temperature is 180-250 ℃, 8-16 hour de-waxing time; De-waxing finishes behind the cool to room temperature, and ceramic core is taken out, and imbeds and burns eventually in the 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 manufacturing approach of burning ceramic core, and de-waxing filler special related in this method adopts aluminium oxide, crosses 400 mesh standard sieves, gets the lower part of screen branch as the de-waxing filler special; Burn filler special eventually and adopt the high purity aluminium oxide powder: purity 99.7%, Na
2O content 0.04% is crossed 140 orders and 240 mesh standard sieves, gets mid portion as burning filler special eventually, and the ceramic core green compact are imbedded above-mentioned de-waxing filler special; Put into the baking oven de-waxing then, de-waxing stage maximum temperature is 180 ℃, and 10 hours de-waxing time, de-waxing finishes behind the cool to room temperature; Ceramic core is taken out, imbed above-mentioned the burning eventually in the filler special, 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 manufacturing approach of burning ceramic core, and de-waxing filler special related in this method adopts magnesia, crosses 400 mesh standard sieves, gets the lower part of screen branch as the de-waxing filler special; Burn filler special eventually and adopt the high purity aluminium oxide powder: purity 99.0%, Na
2O content 0.02% is crossed 140 orders and 240 mesh standard sieves, gets mid portion as burning filler special eventually, and the ceramic core green compact are imbedded above-mentioned de-waxing filler special; Put into the baking oven de-waxing then, de-waxing stage maximum temperature is 200 ℃, and 14 hours de-waxing time, de-waxing finishes behind the cool to room temperature; Ceramic core is taken out, imbed above-mentioned burning eventually in the 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 manufacturing approach of burning ceramic core, and de-waxing filler special related in this method adopts silica, crosses 400 mesh standard sieves, gets the lower part of screen branch as the de-waxing filler special; Burn filler special eventually and adopt the high purity aluminium oxide powder: purity 99.0%, Na
2O content 0.016% is crossed 140 orders and 240 mesh standard sieves, gets mid portion as burning filler special eventually; The ceramic core green compact are imbedded above-mentioned de-waxing filler special, put into low temperature wax expelling furnace de-waxing then, de-waxing stage maximum temperature is 250 ℃; 16 hours de-waxing time, de-waxing finishes behind the cool to room temperature, and ceramic core is taken out; Imbed above-mentioned the burning eventually in the filler special, Fast Sintering in the ceramic core roaster then, 10 ℃/min of programming rate; Sintering temperature is 1300 ℃, makes ceramic core.
Priority Applications (1)
| 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 |
|---|---|---|---|
| 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 true CN102407291A (en) | 2012-04-11 |
| CN102407291B CN102407291B (en) | 2013-06-05 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104043770A (en) * | 2014-06-10 | 2014-09-17 | 中国科学院金属研究所 | Packing powder for sintering ceramic core |
| 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 |
| CN107473751A (en) * | 2017-07-27 | 2017-12-15 | 佛山市非特新材料有限公司 | A kind of preparation method of two-part sintering ceramic mold core |
| CN107999702A (en) * | 2017-12-22 | 2018-05-08 | 东方电气集团东方汽轮机有限公司 | A kind of ceramic core sinters formative technology |
| CN108275988A (en) * | 2018-03-01 | 2018-07-13 | 辽宁航安特铸材料有限公司 | A kind of improved silicon-base ceramic core preparation method |
| 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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| CN102079653A (en) * | 2010-12-06 | 2011-06-01 | 北京航空航天大学 | Method for producing silicon-based ceramic core for aircraft engine blade |
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| JPH10277704A (en) * | 1997-04-09 | 1998-10-20 | Akio Nishihara | Metal injection-forming method with placed core |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104043770A (en) * | 2014-06-10 | 2014-09-17 | 中国科学院金属研究所 | Packing powder for sintering ceramic core |
| 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 |
| CN107473751A (en) * | 2017-07-27 | 2017-12-15 | 佛山市非特新材料有限公司 | A kind of preparation method of two-part sintering ceramic mold core |
| 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 |
| CN107999702A (en) * | 2017-12-22 | 2018-05-08 | 东方电气集团东方汽轮机有限公司 | A kind of ceramic core sinters formative technology |
| 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 |
| CN108275988A (en) * | 2018-03-01 | 2018-07-13 | 辽宁航安特铸材料有限公司 | A kind of improved silicon-base ceramic core preparation method |
| 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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| CN102407291B (en) | 2013-06-05 |
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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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