CN100548921C - A kind of non-water based casting molding technique of boron carbide product - Google Patents
A kind of non-water based casting molding technique of boron carbide product Download PDFInfo
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- CN100548921C CN100548921C CNB2007101138061A CN200710113806A CN100548921C CN 100548921 C CN100548921 C CN 100548921C CN B2007101138061 A CNB2007101138061 A CN B2007101138061A CN 200710113806 A CN200710113806 A CN 200710113806A CN 100548921 C CN100548921 C CN 100548921C
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Abstract
The present invention relates to a kind of non-water based casting molding technique of boron carbide product, it is characterized in that earlier organic monomer being dissolved in the organic solvent, and add dispersion agent, make monomer solution; In monomer solution, add the norbide powder, make slurry, add the benzene or the toluene solution of initiator then, mix; Subsequently the slurry that makes is injected mould and vacuum outgas 5～20 minutes; It is 100～120 ℃ baking oven that the mould that slurry will be housed is again put into temperature, and constant temperature 5～30 minutes makes the reaction of slurry generation organic polymer, obtains biscuit; Biscuit is deviate from from mould, and freeze-day with constant temperature is 2～6 hours in 130～150 ℃ baking oven; At last with biscuit degreasing and sintering.The invention has the advantages that to prepare parts that biscuit intensity height is easy to carry out mechanical workout with near net-shape and complicated shape; Organic content is lower, and is easy to remove in sintering, has realized preparation low-cost, high-performance carbonization boron material.
Description
Technical field
The present invention relates to a kind of moulding process of ceramic, particularly relate to a kind of non-water based casting molding technique of boron carbide product.
Background technology
In the preparation process of boron carbide material, the moulding process of employing mainly is divided into dry method and wet method two big classes at present.In order to widen the range of application of boron carbide material, practical application is made various complicated shapes to the norbide product more and more, and wet moulding can be than being easier to reach this purpose.But there are some problems in traditional wet moulding, mainly absorbs moisture by gypsum mold as injection forming and realizes, causes the blank density distribution gradient easily, this is because shrinkage degree is inconsistent when dry, product deforms easily, and blank strength is low, is difficult to carry out mechanical workout.In hot die-casting molding or the injection molding, paraffin or other organic polymers account for 20% of total mass, cause difficulty for follow-up de-waxing or degreasing, and the process of de-waxing or degreasing causes blank strength to reduce, easily produce distortion, therefore also be unsuitable for preparing the ceramic of complicated shape and near net-shape.
Injectiong coagulation shaping technology (gelcasting) is proposed in early 1990s by people such as U.S. Oak Ridge National Laboratory MAJanny and O.O.Omatete.At first ceramic powder is scattered in the aqueous solution or non-aqueous solution that contains organic monomer and linking agent by this technology, prepare the concentrated suspension of low viscosity, high solid loading, add initiator and catalyzer then, suspensoid is injected the mould in non-hole, under certain temperature condition, causing the organic monomer polymerization and form the three-dimensional network gel structure, is biscuit of ceramics thereby cause the slurry consolidation in-situ forming.Injectiong coagulation shaping technology has advantages such as near-net-shape, goods microtexture be even, thereby has vast market prospect, is subjected to the very big attention of domestic and international academia and industry member.At present, the type that congeals into notes generally adopts water as dispersion medium (be called water base notes congeal into type), but adopt organic solvent to prepare high solid loading norbide slurry as dispersion medium, thereby make high-performance carbonization boron material (be called non-water based casting congeal into type), not seeing as yet both at home and abroad has report.
Summary of the invention
The non-water based casting molding technique that the purpose of this invention is to provide a kind of high-performance carbonization boron goods, it has reduced production cost greatly, has simplified production technique, improved the physical strength of base substrate, and can once prepare the base substrate of complicated shape, to remedy the above-mentioned deficiency of existing technology.
A kind of non-water based casting molding technique of boron carbide product is characterized in that earlier organic monomer being dissolved in the organic solvent, and adds dispersion agent, makes monomer solution; In monomer solution, add the norbide powder, make slurry, add the benzene or the toluene solution of initiator then, mix; Subsequently the slurry that makes is injected mould and vacuum outgas 5～20 minutes; It is 100～120 ℃ baking oven that the mould that slurry will be housed is again put into temperature, and constant temperature 5～30 minutes makes the reaction of slurry generation organic polymer, obtains biscuit; Biscuit is deviate from from mould, and freeze-day with constant temperature is 2～6 hours in 130～150 ℃ baking oven; At last with biscuit degreasing and sintering.
The boron carbide ceramics biscuit density and the intensity height of the present invention's preparation are easy to mechanical workout, and moulding process is simple, and cost is low, and can be used for complex-shaped boron carbide product.
Embodiment
The present invention is dissolved in organic monomer in the organic solvent earlier, and adds dispersion agent, makes monomer solution; In monomer solution, add the norbide powder, make slurry, add the benzene or the toluene solution of initiator then, mix; Subsequently the slurry that makes is injected mould and vacuum outgas 5～20 minutes; It is 100～120 ℃ baking oven that the mould that slurry will be housed is again put into temperature, and constant temperature 5～30 minutes makes the reaction of slurry generation organic polymer, obtains biscuit; Biscuit is deviate from from mould, and freeze-day with constant temperature is 2～6 hours in 130～150 ℃ baking oven; At last with biscuit degreasing and sintering.
Organic solvent of the present invention is propyl carbinol, n-Octanol, dimethyl phthalate or dibutyl phthalate.Described initiator is Diisopropyl azodicarboxylate, 2,2'-Azobis(2,4-dimethylvaleronitrile), dicumyl peroxide or dibenzoyl peroxide, and initiator is mixed with 10% benzene or toluene solution; The volumn concentration of initiator solution in slurry is 1～5%.Described dispersion agent is CH-10S; The volumn concentration of described dispersion agent in slurry is 1～10%.Described organic monomer is two kinds that contain in the organic compound of vinyl, propenyl, acrylate, acrylamide or acrylic-functional, and a kind of for containing the organic compound of trifunctional, another kind contains the organic compound of bifunctional; The volumn concentration of described organic monomer in slurry is 5～20%, and preceding a kind of organic monomer is 1: 1～10 with the volume ratio of a kind of organic monomer in back.
Key problem in technology of the present invention: at first, select appropriate organic solvent, this organic solvent must be a monomer, and has lower vapour pressure and lower viscosity under monomer crosslinked temperature.Secondly, select suitable dispersion agent, and this dispersion agent does not cause the organic monomer polymerization.
Embodiment
In 20ml organic solvent n-Octanol, add 4ml organic monomer TMPTA (TMPTA) and 16ml organic monomer 1,6 hexanediol diacrylate (HDDA) and 8ml dispersing agent C H-10S, mix and make monomer solution; The boron carbide powder that adds the about 3 μ m of 160.16g particle diameter in monomer solution mixes makes slurry, adds the 4ml volumn concentration then and be the benzole soln of 10% dibenzoyl peroxide, continues to mix, and obtains slurry; Subsequently slurry is injected mould and vacuum outgas 15 minutes; The mould that slurry will be housed is again put into 110 ℃ baking oven through 20 minutes curing moldings; At last with the base substrate after the demoulding in 130 ℃ baking oven dry 4 hours, to be dried fully after, obtain ceramic body, the bending strength of this base substrate is 20MPa, can carry out sintering after mechanical workout or the degreasing.
Claims (1)
1, a kind of non-water based casting molding technique of boron carbide product is characterized in that earlier organic monomer being dissolved in the organic solvent, and adds dispersion agent, makes monomer solution; In monomer solution, add the norbide powder, make slurry, add the benzene or the toluene solution of initiator then, mix; Subsequently the slurry that makes is injected mould and vacuum outgas 5～20 minutes; It is 100～120 ℃ baking oven that the mould that slurry will be housed is again put into temperature, and constant temperature 5～30 minutes makes the reaction of slurry generation organic polymer, obtains biscuit; Biscuit is deviate from from mould, and freeze-day with constant temperature is 2～6 hours in 130～150 ℃ baking oven; At last with biscuit degreasing and sintering; Described organic solvent is propyl carbinol, n-Octanol, dimethyl phthalate or dibutyl phthalate; Described initiator is Diisopropyl azodicarboxylate, 2,2'-Azobis(2,4-dimethylvaleronitrile), dicumyl peroxide or dibenzoyl peroxide; The volumn concentration of initiator solution in slurry is 1～5%; Described dispersion agent is CH-10S; The volumn concentration of dispersion agent in slurry is 1～10%; Described organic monomer is a kind of to be TMPTA or oxyethyl group TMPTA, and another kind is 1,6 hexanediol diacrylate or 1,4 butanediol diacrylate; The volumn concentration of described organic monomer in slurry is 5～20%; Preceding a kind of organic monomer is 1: 1～10 with the volume ratio of a kind of organic monomer in back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101138061A CN100548921C (en) | 2007-09-13 | 2007-09-13 | A kind of non-water based casting molding technique of boron carbide product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101138061A CN100548921C (en) | 2007-09-13 | 2007-09-13 | A kind of non-water based casting molding technique of boron carbide product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101157555A CN101157555A (en) | 2008-04-09 |
| CN100548921C true CN100548921C (en) | 2009-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007101138061A Expired - Fee Related CN100548921C (en) | 2007-09-13 | 2007-09-13 | A kind of non-water based casting molding technique of boron carbide product |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107449324B (en) * | 2017-09-13 | 2019-10-25 | 山东汇金新材料有限公司 | A kind of no pressing phase sintering boron carbide helmet and preparation method thereof |
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2007
- 2007-09-13 CN CNB2007101138061A patent/CN100548921C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 凝胶注模成型工艺的研究. 晏伯武.中国陶瓷，第42卷第2期. 2006 |
| 凝胶注模成型工艺的研究. 晏伯武.中国陶瓷，第42卷第2期. 2006 * |
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| CN101157555A (en) | 2008-04-09 |
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Granted publication date: 20091014 Termination date: 20120913 |