CN102672800A - Method for reducing friction force during superconductor bulk uniaxial compression molding - Google Patents
Method for reducing friction force during superconductor bulk uniaxial compression molding Download PDFInfo
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- CN102672800A CN102672800A CN2011100616594A CN201110061659A CN102672800A CN 102672800 A CN102672800 A CN 102672800A CN 2011100616594 A CN2011100616594 A CN 2011100616594A CN 201110061659 A CN201110061659 A CN 201110061659A CN 102672800 A CN102672800 A CN 102672800A
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Abstract
The invention relates to a method for reducing friction force during superconductor bulk uniaxial compression molding. The method comprises the following steps of using a cylindrical mold with a diameter of 5-70 mm and a height of 80-100 mm; firstly coating a layer of demolding agent on the inner wall of the mold before loading; loading 80-300 g superconductor bulks in the mold; performing compression molding by a uniaxial automatic compression molding device, wherein the pressure is 20-45 T. According to the method provided by the invention, a layer of lubricating film is firstly formed in the uniaxial compressing mold, and uniaxial compression is further conducted, thus, the friction force between the superconductor bulk and the mold is reduced during mold compression, and cracks in the superconductor bulk which is finally formed are inhibited.
Description
Technical field
A kind of method that reduces friction when the present invention relates to utilize single shaft molding device moulding high-temperature superconducting block.
Background material
Since finding that high-temperature superconductor electrically in 1986, worldwide started the high-temperature superconductor research boom.Up to the present, the field of materials and the forceful electric power light current application of high-temperature superconductor have all been carried out extensive careful research.For high-temperature superconducting block, two basic characteristics are arranged is super-conductive magnetic suspension power with capture magnetic field.The floating characteristic of the magnetic of bulk can be used to make the contactless transport system of superconduction, magnetic bearing, flywheel energy storage system etc.Capture the characteristic of magnetic flux based on height, can make high-temperature superconducting magnet, superconducting motor etc.Therefore, it is crucial preparing high performance superconductor.Utilize the melting texture growing technology can prepare the high performance superconduction block material of large scale, but will seek out practical superconductor, must further improve the critical current density of high-temperature superconducting block and the mechanical strength of single domain size and bulk.For this reason, adopt the high performance single domain superconduction block material of melting texture growing prepared large scale that combines top seed crystal technology to become the focus of superconduction block material research in recent years.
Yet for the superconducting sample of large scale (diameter is greater than 30mm), the predecessor moulding is that superconduction block material prepares an important step in the process.Usually the molding mode that adopts is single shaft mold pressing and isostatic cool pressing.When adopting the thinner powder of granularity with the single shaft compression molding, in the predecessor block that suppresses, form micro-crack easily, this defective still is retained in the block behind sintering, has had a strong impact on machinery, electricity and the magnetic performance of superconducting block.Therefore, the moulding process of research superconduction predecessor powder is most important.At present, for the superconduction block material of diameter greater than 30mm, the predecessor block produces more crackle after the single shaft mold pressing, and density is less, so generally adopt the moulding of isostatic cool pressing mode.Even but adopt the isostatic cool pressing technology, also at first to carry out preformed to the superconduction powder with the single shaft molding device, therefore, how to avoid after the single shaft mold pressing in the predecessor block crackle just most important.
Summary of the invention
The problems referred to above to prior art; The present invention proposes a kind of before the superconducting precursor powder body carries out the single shaft compression molding; The method that the inwall of mould is lubricated; To reduce the frictional force between the superconduction predecessor block and mould in the mold process, be suppressed in the superconducting block of final molding and crack.
For realizing above-mentioned purpose, the present invention includes following technical scheme:
A kind of method that in superconduction block material single shaft compression molding process, reduces friction; This method comprises the cylindrical die that uses diameter 35～70mm, high 80～100mm; Before charging; On the mould madial wall, apply one deck releasing agent earlier, this releasing agent is selected from triethanolamine, propane diols or organic silicone oil; Pack 80～300g superconduction powder in this mould into then; Adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is 20～45T.
Aforesaid method, wherein, the consumption of this releasing agent is preferably 0.5～2.5mg/cm
2
Aforesaid method; This method comprises the cylindrical die that uses diameter 35mm, high 80mm; Before charging, earlier apply the mould madial wall with formation one deck lubricating film with about 100mg triethanolamine, pack 80g superconduction powder in this mould into then; Adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is 20～25T.
Aforesaid method; This method comprises the cylindrical die that uses diameter 57mm, high 80mm; Before charging, earlier apply the mould madial wall with formation one deck lubricating film with about 160mg triethanolamine, pack 200g superconduction powder in this mould into then; Adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is 30～35T.
Aforesaid method; This method comprises the cylindrical die that uses diameter 70mm, high 100mm; Before charging, earlier apply the mould madial wall with formation one deck lubricating film with about 200mg triethanolamine, pack 300g superconduction powder in this mould into then; Adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is 40～45T.
Aforesaid method; This method comprises uses diameter 57mm, and the cylindrical die of high 80mm is before charging; Apply the mould madial wall to form one deck lubricating film with about 300mg triethanolamine earlier; Pack 200g superconduction powder in this mould into then, adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is 30～35T.
Aforesaid method; This method comprises uses diameter 70mm, and the cylindrical die of high 100mm is before charging; Apply the mould madial wall to form one deck lubricating film with about 450mg triethanolamine earlier; Pack 300g superconduction powder in this mould into then, adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is 40～45T.
Beneficial effect of the present invention is; This method is through forming one deck lubricating film earlier in the mould of single shaft mold pressing; Pack the superconduction powder in the mould into then; Carry out the single shaft mold pressing again,, be suppressed in the superconducting block of final molding and crack to reduce the frictional force between the superconduction predecessor block and mould in the mold process.In the present invention, apply one deck releasing agent, its objective is the coating that between mould and module, forms one deck inertia and have lubrication, module can be deviate from from mould easily at the mould madial wall.For this reason, the present invention takes all factors into consideration motion conditions, material surface roughness, working environment and the condition of work of friction pair on SELECTING SUITABLE MOULD RELEASE AGENT, and the multiple factors such as performance of releasing agent.To avoid releasing agent that the superconduction powder is exerted an influence on the one hand, can be volatilizable below 600 ℃ and not react with the superconduction powder; On the other hand, require releasing agent to be easy to form uniform thin layer (good film-forming property), and can prevent oxidation on metal surface at mould inner surface.Result of the test shows, mould is lubricated the moulding that helps superconducting block, especially more remarkable effect when the large-sized superconducting block of compacting.
The specific embodiment
Embodiment 1
With RE211 (RE, Ba and Cu oxide RE
2BaCuO
5) powder joins RE123 (RE, Ba and Cu oxide REBa in the ratio of 40mol%
2Cu
3O
7) in the powder, and sneak into 0.2wt%Pt, even through high speed runout ball mill mixing, the above-mentioned superconduction powder of weighing 80g; Use diameter 35mm; The cylindrical die of high 80mm before charging, dips in absorbent cotton earlier and gets triethanolamine wiping mould madial wall to form one deck lubricating film; The about 100mg of the consumption of triethanolamine in each mould; Pack the superconduction powder in the corresponding mould into then, adopt the single shaft molding device that pressurizes automatically to be pressed again, adopt 20T, 25T, three kinds of pressure of 30T to be pressed into three block samples respectively.
Superconducting block to after the moulding is observed, and finds under above-mentioned three kinds of briquetting pressures, only to apply the superconducting block of 30T pressure, has slight crackle to occur in the bottom, and other two kinds of pressure all can make the normal moulding of superconducting block.
Embodiment 2
With RE211 (RE, Ba and Cu oxide RE
2BaCuO
5) powder joins RE123 (RE, Ba and Cu oxide REBa in the ratio of 40mol%
2Cu
3O
7) in the powder, and sneak into 0.2wt%Pt, even through high speed runout ball mill mixing, the above-mentioned superconduction powder of weighing 200g; Use diameter 57mm; The cylindrical die of high 80mm before charging, dips in absorbent cotton earlier and gets triethanolamine wiping mould madial wall to form one deck lubricating film; The about 160mg of the consumption of triethanolamine in each mould; Pack the superconduction powder in the corresponding mould into then, adopt the single shaft molding device that pressurizes automatically to be pressed again, adopt 30T, 35T, three kinds of pressure of 40T to be pressed into three block samples respectively.
Superconducting block to after the moulding is observed, and finds under above-mentioned three kinds of briquetting pressures, only to apply the superconducting block of 40T pressure, has slight crackle to occur in the bottom, and other two kinds of pressure all can make the normal moulding of superconducting block.
Embodiment 3
With RE211 (RE, Ba and Cu oxide RE
2BaCuO
5) powder joins RE123 (RE, Ba and Cu oxide REBa in the ratio of 40mol%
2Cu
3O
7) in the powder, and sneak into 0.2wt%Pt, even through high speed runout ball mill mixing, the above-mentioned superconduction powder of weighing 300g; Use diameter 70mm; The cylindrical die of high 100mm before charging, dips in absorbent cotton earlier and gets triethanolamine wiping mould madial wall to form one deck lubricating film; The about 200mg of the consumption of triethanolamine in each mould; Pack the superconduction powder in the corresponding mould into then, adopt the single shaft molding device that pressurizes automatically to be pressed again, adopt 40T, 45T, three kinds of pressure of 50T to be pressed into three block samples respectively.
Superconducting block to after the moulding is observed, and finds under above-mentioned three kinds of briquetting pressures, only to apply the superconducting block of 50T pressure, has slight crackle to occur in the bottom, and other two kinds of pressure all can make the normal moulding of superconducting block.
Embodiment 4
With RE211 (RE, Ba and Cu oxide RE
2BaCuO
5) powder joins RE123 (RE, Ba and Cu oxide REBa in the ratio of 40mol%
2Cu
3O
7) in the powder, and sneak into 0.2wt%Pt, even through high speed runout ball mill mixing, the above-mentioned superconduction powder of weighing 200g; Use diameter 57mm; The cylindrical die of high 80mm before charging, dips in absorbent cotton earlier and gets triethanolamine wiping mould madial wall to form one deck lubricating film; The about 300mg of the consumption of triethanolamine in each mould; Pack the superconduction powder in the corresponding mould into then, adopt the single shaft molding device that pressurizes automatically to be pressed again, adopt 30T, 35T, three kinds of pressure of 40T to be pressed into three block samples respectively.
Superconducting block to after the moulding is observed, and finds under above-mentioned three kinds of briquetting pressures, only to apply the superconducting block of 40T pressure, has slight crackle to occur in the bottom, and other two kinds of pressure all can make the normal moulding of superconducting block.
Embodiment 5
With RE211 (RE, Ba and Cu oxide RE
2BaCuO
5) powder joins RE123 (RE, Ba and Cu oxide REBa in the ratio of 40mol%
2Cu
3O
7) in the powder, and sneak into 0.2wt%Pt, even through high speed runout ball mill mixing, the above-mentioned superconduction powder of weighing 300g; Use diameter 70mm; The cylindrical die of high 100mm before charging, dips in absorbent cotton earlier and gets triethanolamine wiping mould madial wall to form one deck lubricating film; The about 450mg of the consumption of triethanolamine in each mould; Pack the superconduction powder in the corresponding mould into then, adopt the single shaft molding device that pressurizes automatically to be pressed again, adopt 40T, 45T, three kinds of pressure of 50T to be pressed into three block samples respectively.
Superconducting block to after the moulding is observed, and finds under above-mentioned three kinds of briquetting pressures, only to apply the superconducting block of 50T pressure, has slight crackle to occur in the bottom, and other two kinds of pressure all can make the normal moulding of superconducting block.
Comparative Examples 1
With RE211 (RE, Ba and Cu oxide RE
2BaCuO
5) powder joins RE123 (RE, Ba and Cu oxide REBa in the ratio of 40mol%
2Cu
3O
7) in the powder, and sneak into 0.2wt%Pt, even through high speed runout ball mill mixing; Use diameter 35mm, the cylindrical die of high 80mm, the above-mentioned superconduction powder of the 80g that weighs with scale are packed in the above-mentioned mould, adopt the single shaft molding device that pressurizes automatically to be pressed, and adopt 10T, 15T, three kinds of pressure of 20T to be pressed into three block samples respectively.
Superconducting block to after the moulding is observed, and finds that superconducting block is easy to occur lamination when moulding pressure during greater than 15T.
For above-mentioned mould; If before charging; Dip in absorbent cotton earlier and get triethanolamine wiping mould madial wall forming one deck lubricating film, the about 100mg of the consumption of triethanolamine in each mould packs the superconduction powder in the corresponding mould into then; Adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is respectively 20,25,30T.
Superconducting block to after the moulding is observed, and finds under above-mentioned three kinds of briquetting pressures, only to apply the superconducting block of 30T pressure, has slight crackle to occur in the bottom, and other two kinds of pressure all can make the normal moulding of superconducting block.
From above result, after obviously mould being lubricated, can reduce the frictional force between the superconducting block and mould inner wall in the single shaft mold process greatly, very favourable to the moulding of superconducting block.Especially in compacting more remarkable effect during large-sized superconducting block.
Claims (7)
1. method that in superconduction block material single shaft compression molding process, reduces friction; It is characterized in that; This method comprises the cylindrical die that uses diameter 35～70mm, high 80～100mm; Before charging, on the mould madial wall, apply one deck releasing agent earlier, this releasing agent is selected from triethanolamine, propane diols or organic silicone oil; Pack 80～300g superconduction powder in this mould into then; Adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is 20～45T.
2. the method for claim 1 is characterized in that, the consumption of said releasing agent is 0.5～2.5mg/cm
2
3. the method for claim 1; It is characterized in that said method comprises the cylindrical die that uses diameter 35mm, high 80mm, before charging; Apply the mould madial wall to form one deck lubricating film with about 100mg triethanolamine earlier; Pack 80g superconduction powder in this mould into then, adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is 20～25T.
4. the method for claim 1; It is characterized in that said method comprises the cylindrical die that uses diameter 57mm, high 80mm, before charging; Apply the mould madial wall to form one deck lubricating film with about 160mg triethanolamine earlier; Pack 200g superconduction powder in this mould into then, adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is 30～35T.
5. the method for claim 1; It is characterized in that said method comprises the cylindrical die that uses diameter 70mm, high 100mm, before charging; Apply the mould madial wall to form one deck lubricating film with about 200mg triethanolamine earlier; Pack 300g superconduction powder in this mould into then, adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is 40～45T.
6. the method for claim 1 is characterized in that, said method comprises uses diameter 57mm; The cylindrical die of high 80mm; Before charging, earlier apply the mould madial wall with formation one deck lubricating film with about 300mg triethanolamine, pack 200g superconduction powder in this mould into then; Adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is 30～35T.
7. the method for claim 1 is characterized in that, said method comprises uses diameter 70mm; The cylindrical die of high 100mm; Before charging, earlier apply the mould madial wall with formation one deck lubricating film with about 450mg triethanolamine, pack 300g superconduction powder in this mould into then; Adopt the single shaft molding device that pressurizes automatically to be pressed again, pressure is 40～45T.
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|---|---|---|---|
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| CN201110061659.4A CN102672800B (en) | 2011-03-15 | 2011-03-15 | A kind of method reduced friction in superconduction block material single shaft compression molding process |
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| CN102672800B CN102672800B (en) | 2016-03-30 |
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|---|---|---|---|---|
| US3956452A (en) * | 1973-08-16 | 1976-05-11 | Shinagawa Firebrick, Co., Ltd. | Dry-type isostatic pressing method involving minimization of breaks or cracks in the molded bodies |
| JPH03164207A (en) * | 1989-11-24 | 1991-07-16 | Suzuki Motor Corp | Mold for ceramic |
| JPH1080910A (en) * | 1996-09-09 | 1998-03-31 | Ishikawajima Harima Heavy Ind Co Ltd | Molding method for thin molding |
| CN1657253A (en) * | 2005-02-04 | 2005-08-24 | 淄博德惠来装饰瓷板有限公司 | Method and device for shaping fiber ceramic plate |
| CN101168844A (en) * | 2007-11-30 | 2008-04-30 | 重庆工学院 | Treatment method for increasing die self-demouding performance |
| CN101417875A (en) * | 2008-11-28 | 2009-04-29 | 江苏大学 | Use of high temperature superconduction material in antifriction, abrasion-proof and lubrication |
-
2011
- 2011-03-15 CN CN201110061659.4A patent/CN102672800B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3956452A (en) * | 1973-08-16 | 1976-05-11 | Shinagawa Firebrick, Co., Ltd. | Dry-type isostatic pressing method involving minimization of breaks or cracks in the molded bodies |
| JPH03164207A (en) * | 1989-11-24 | 1991-07-16 | Suzuki Motor Corp | Mold for ceramic |
| JPH1080910A (en) * | 1996-09-09 | 1998-03-31 | Ishikawajima Harima Heavy Ind Co Ltd | Molding method for thin molding |
| CN1657253A (en) * | 2005-02-04 | 2005-08-24 | 淄博德惠来装饰瓷板有限公司 | Method and device for shaping fiber ceramic plate |
| CN101168844A (en) * | 2007-11-30 | 2008-04-30 | 重庆工学院 | Treatment method for increasing die self-demouding performance |
| CN101417875A (en) * | 2008-11-28 | 2009-04-29 | 江苏大学 | Use of high temperature superconduction material in antifriction, abrasion-proof and lubrication |
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Effective date of registration: 20190703 Address after: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee after: Research Institute of engineering and Technology Co., Ltd. Address before: No. 2, Xinjie street, Xicheng District, Beijing, Beijing Patentee before: General Research Institute for Nonferrous Metals |