CN1228274C - Method of gas phase deglue pretreating for gel injucting molding ceranuc blank - Google Patents
Method of gas phase deglue pretreating for gel injucting molding ceranuc blank Download PDFInfo
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- CN1228274C CN1228274C CN 200410004743 CN200410004743A CN1228274C CN 1228274 C CN1228274 C CN 1228274C CN 200410004743 CN200410004743 CN 200410004743 CN 200410004743 A CN200410004743 A CN 200410004743A CN 1228274 C CN1228274 C CN 1228274C
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- gas phase
- ceramic body
- blank
- deglue
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000000465 moulding Methods 0.000 title abstract description 9
- 239000000919 ceramic Substances 0.000 claims abstract description 38
- 238000002203 pretreatment Methods 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims description 25
- 238000005266 casting Methods 0.000 claims description 22
- 239000000758 substrate Substances 0.000 claims description 22
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 238000006731 degradation reaction Methods 0.000 abstract description 4
- 150000003384 small molecules Chemical class 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 238000001746 injection moulding Methods 0.000 abstract description 2
- 239000003292 glue Substances 0.000 abstract 2
- 238000005336 cracking Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 229920002521 macromolecule Polymers 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 11
- 239000002245 particle Substances 0.000 description 5
- 238000005238 degreasing Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000006701 autoxidation reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012667 polymer degradation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
The present invention discloses a new gas phase deglue pretreatment method for ceramic blanks formed by glue injection molding by using organic substances in degradation blanks in order to ensure that the ceramic blanks are not cracked in the deglue process, which belongs to a range of treatment technique for blank deglue in ceramic molding. A ceramic blank formed by glue injection moldifng uses organic substances in a degradation blank, and reticular macro molecules break chains into small molecules; simultaneously, the internal stress of the blank is released. A treated blank is complete without cracking after thermal defatting and deglue, and the interior has no defects. The present invention has the advantages of simple technique, low cost and suitability for industrial production.
Description
Technical field
The invention belongs to base substrate binder removal treatment technology scope in the forming process of ceramics, particularly utilize in the degraded base substrate organism to guarantee ceramic body indehiscent a kind of gel casting forming ceramic body binder removal gas phase pretreatment process in the binder removal process.
Background technology
The preparation technology of high performance ceramic material and parts is prerequisites of stupalith development and application.And moulding technology plays a part to form a connecting link in the preparation process of whole stupalith, is reliability, yield rate and the repeatable key that guarantees stupalith and parts, and is directly related with industrialization and large-scale production.The moulding process of pottery is divided into dry-press process and colloidal formation two big classes.The even green body of dry-press process is poor, is difficult to overcome particulate and reunites, and is suitable for preparing the goods of simple shape.Colloidal formation technology is that ceramic particle is dispersed in the liquid medium, prepares certain volume fractional suspensoid, then the method for the base substrate of the certain density of moulding by different solidification technologies.Traditional colloidal shaping method comprises injection forming, flow casting molding, hot die-casting molding, injection molding etc., is used widely at industrial circle at present.Enter after the nineties, for the further integrity problem that improves the homogeneity of ceramic body and solve stupalith, colloidal state consolidation in-situ forming technology is arisen at the historic moment and is become the focus of research, gel casting forming (Gelcasting), temperature-induced flocculation moulding (Temperature Induced F1oculation), directly solidifies casting (Direct CoagulationCasting) etc. and occurs in succession.
Wherein, gel casting forming is a kind of important ceramic in-situ consolidation colloidal forming technology that is subjected to extensive concern in recent years.It has near-net-shape complicated shape ceramic component, good even green body, high blank strength, excellent sintering character, and advantages such as organic content is low in simple to operate, the base substrate, has been widely used in the moulding of various ceramic systems.Its principle is to utilize the crosslinking reaction of organic monomer, the ceramic powder particle in-situ is set in the macromolecular elastomer equably, thus the goods of preparation definite shape.Yet, though the ceramic body organic content for preparing with present method is lower, but, when adopting traditional hot degreasing process binder removal, there is the yield rate of ceramic body binder removal of very big difficulty, particularly large section size very low because organic monomer is cross-linked to each other and has formed spacial framework.
Address this problem, can manage to make the superpolymer in the base substrate to degrade.The net high-polymer chain rupture becomes the wire superpolymer so on the one hand, even small molecules, makes that the easier decomposition of organism is discharged in the hot degreasing binder removal process; The polymer degradation chain rupture is released the internal stress of base substrate on the other hand, makes that base substrate can not ftracture under the internal stress effect because of strength degradation in the binder removal process.
Summary of the invention
It is simple to the purpose of this invention is to provide a kind of technology, is fit to the gel casting forming ceramic body binder removal gas phase pretreatment process of suitability for industrialized production.Described gel casting forming ceramic body gas phase pretreatment process carries out successively as follows:
(1) ceramic body of gel casting forming preparation dried in the shade 1～5 day 15 ℃～40 ℃ following lucifuges earlier, again in baking oven, 70 ℃～95 ℃ baking oven dry in 1～3 day down;
(2) ceramic body after will drying carries out the gas phase pre-treatment with strong oxidizing property gas;
(3) base substrate is heated up binder removal obtains complete indehiscent ceramic body.
Described is to be the ozone of 5-600mg/l with concentration with the pre-treatment of strong oxidizing property gas gas phase, carries out the ozone pre-treatment 5～30 hours.
Described bad body intensification binder removal is treated to: 20 ℃～300 ℃ with 10～20 hours, 300 ℃～400 ℃ with 15～25 hours, 400 ℃～600 ℃ with 5～15 hours or at 600 ℃～900 ℃ with 3～8 hours.
Beneficial effect of the present invention is the ceramic body of gel casting forming has been carried out the gas phase pre-treatment before binder removal, the superpolymer in the degraded gel casting forming ceramic body.Promptly utilize the strong oxidizing property degradation of organic substances of ozone, dried base substrate is handled appropriate time, behind overheated degreasing binder removal, can obtain complete indehiscent base substrate.Technology of the present invention is simple, and is with low cost, is fit to suitability for industrialized production.
Embodiment
The present invention will be further described below in conjunction with embodiment:
The present invention is a kind of pretreatment process of gel casting forming ceramic body binder removal.This gel casting forming ceramic body gas phase pretreatment process carries out successively as follows:
(1) ceramic body of gel casting forming preparation dried in the shade 1～5 day 15 ℃～40 ℃ following lucifuges earlier, again in baking oven, 70 ℃～95 ℃ baking oven dry in 1～3 day down;
(2) the ceramic body strong oxidizing property gas ozone (concentration is 5-600mg/l) after will drying carried out the gas phase pre-treatment 5～30 hours;
(3) base substrate is treated to according to base substrate intensification binder removal: 20 ℃～300 ℃ with 25～60 hours, 300 ℃～400 ℃ with 15～25 hours, 400 ℃～600 ℃ with 5～15 hours or 600 ℃～900 ℃ with 3～8 hours intensification binder removals, obtain complete indehiscent ceramic body.
In ceramic body gel casting forming process, because organic monomer and linking agent polymerization reaction take place form spacial framework, the ceramic powder particle is set in the macromolecular elastomer equably by original position, thereby prepares the goods of definite shape.After treating body drying, use the ozonize appropriate time.The autoxidation reaction of ozone energy initiated polymerization thing is degraded them, and the superpolymer chain rupture promptly takes place.This makes macromole change small molecules on the one hand, and the internal stress of base substrate is released, and all helps follow-up binder removal technology.After handling appropriate time base substrate is taken out, obtain complete indehiscent ceramic component through binder removal, sintering.
For embodiment the present invention is further specified again below.
Embodiment 1
With the mullite is raw material, and the particle median size is 5 μ m, prepares diameter 5.4cm with gel-casting method, the cylindrical base substrate of high 4.1cm.Base substrate dried in the shade under 35 ℃ 3 days after the demoulding, dried 4 days down at 80 ℃ again.At room temperature handled 10 hours with the 100mg/L concentration of ozone behind the body drying, again through 100 ℃, 50 hours binder removals obtain complete indehiscent base substrate.
Embodiment 2
With α-Al
2O
3Be raw material, the particle median size is 3 μ m, prepares diameter 6.4cm with gel-casting method, the cylindrical base substrate of high 5.9cm.Base substrate dried in the shade under 15 ℃ 5 days after the demoulding, dried 2 days down at 90 ℃ again.At room temperature handled 20 hours with the 200mg/L concentration of ozone behind the body drying, again through 500 ℃, 15 hours binder removals obtain complete indehiscent base substrate.
Claims (3)
1. gel casting forming ceramic body binder removal gas phase pretreatment process, it is characterized in that: described gel casting forming ceramic body gas phase pretreatment process carries out successively as follows:
(1) ceramic body of gel casting forming preparation dried in the shade 1～5 day 15 ℃～40 ℃ following lucifuges earlier, again in baking oven, 70 ℃～95 ℃ baking oven dry in 1～3 day down;
(2) ceramic body after will drying carries out the gas phase pre-treatment with strong oxidizing property gas;
(3) base substrate is heated up binder removal obtains complete indehiscent ceramic body.
2. according to the described gel casting forming ceramic body of claim 1 binder removal gas phase pretreatment process, it is characterized in that: the pre-treatment of described strong oxidizing property gas gas phase was carried out the ozone pre-treatment 5～30 hours for being the ozone of 5-600mg/l with concentration.
3. according to the described gel casting forming ceramic body of claim 1 binder removal gas phase pretreatment process, it is characterized in that: described base substrate intensification binder removal is treated to: 20 ℃～300 ℃ with 10～20 hours, 300 ℃～400 ℃ with 15～25 hours, 400 ℃～600 ℃ with 5～15 hours or 600 ℃～900 ℃ with 3～8 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410004743 CN1228274C (en) | 2004-03-01 | 2004-03-01 | Method of gas phase deglue pretreating for gel injucting molding ceranuc blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410004743 CN1228274C (en) | 2004-03-01 | 2004-03-01 | Method of gas phase deglue pretreating for gel injucting molding ceranuc blank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1559984A CN1559984A (en) | 2005-01-05 |
| CN1228274C true CN1228274C (en) | 2005-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410004743 Expired - Fee Related CN1228274C (en) | 2004-03-01 | 2004-03-01 | Method of gas phase deglue pretreating for gel injucting molding ceranuc blank |
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| CN (1) | CN1228274C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1317233C (en) * | 2005-07-06 | 2007-05-23 | 北京科技大学 | Silica aerogel powder moulding method adopting gel injection molding method |
| KR20080027171A (en) | 2006-09-22 | 2008-03-26 | 세이코 엡슨 가부시키가이샤 | Method for producing sintered body and sintered body |
| CN113976917A (en) * | 2021-09-30 | 2022-01-28 | 西安汇创贵金属新材料研究院有限公司 | Degreasing method for manufacturing precious metal green body through photocuring additive manufacturing |
| CN114560703B (en) * | 2022-03-25 | 2023-03-21 | 山东百川智能科技有限公司 | Process for sintering silicon carbide ceramic through gel casting reaction |
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- 2004-03-01 CN CN 200410004743 patent/CN1228274C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1559984A (en) | 2005-01-05 |
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