CN201253956Y - Mould for adhibiting layer on metal inside and outside surface in high pressure air flow pressing kettle - Google Patents
Mould for adhibiting layer on metal inside and outside surface in high pressure air flow pressing kettle Download PDFInfo
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- CN201253956Y CN201253956Y CNU2008201144965U CN200820114496U CN201253956Y CN 201253956 Y CN201253956 Y CN 201253956Y CN U2008201144965 U CNU2008201144965 U CN U2008201144965U CN 200820114496 U CN200820114496 U CN 200820114496U CN 201253956 Y CN201253956 Y CN 201253956Y
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Abstract
The utility model discloses a die in high pressure air-flow pressing axe, which can stick layer on the inner and outer surface of metal parts. The die structurally comprises a high pressure air-flow pressing axe 1 and metal dies 2 and 2` in the inner cavity. The utility model is characterized in that: the metal dies 2 and 2` are also embedded with elastic dies 3 and 3`, stuck layer fillers 4 and 5 are arranged between the walls of the inner cavities of elastic dies 3 and 3` and the inner and outer surfaces of metal parts, the layer fillers 4 and 5 are the tight-fastened layers 8 and 9 on the inner and outer surfaces of metal parts. The utility model can stick layer on the inner and outer surfaces of any shaped metal parts, and is in particular suitable to stick the polytetrafluoroethylene powder on the metal surface. By protection and calcination, the layer can withstand limited negative pressure and temperature without peel-off so as to obtain ideal thickness and good performance.
Description
Technical field
The utility model relates to a kind of for the metal surfaces externally and internally carries out the mould of paste layer, can be the mould that the metal surfaces externally and internally carries out paste layer in specifically a kind of high pressure draught compacting still.
Background technology
Teaching by " the Chinese corrosion and protection nonmetallic materials specialty committee member of association " Guan Congsheng professor and Wang Weiqiang, the anticorrosion technique of writing is introduced in the book in detail: polytetrafluoroethylene (PTFE) be a kind of tough and tensile, soft, do not have elasticity and a moderate material of hot strength, its hear resistance, chemical resistance and electrical insulating property are all fine.When being lower than-200 ℃ as temperature, under the situation of pressurized, polytetrafluoroethylene (PTFE) still is ductile.Polytetrafluoroethylene (PTFE) is a kind of thermoplastic resin, has tangible cold flow properties, but melting viscosity is big especially, it is flowed and plasticizing, can not carry out injection moulding and melt extrude processing, but the method that adopts like powder metallurgy is heated to its first-order transition temperature (crystalline melt point) to the polytetrafluorethylepowder powder compacting more than 327 ℃ again, makes the crystallization fusion just can make the powder of dispersion condense into one and present certain mechanical property.
Polytetrafluoroethylene (PTFE) is the polymer of tetrafluoroethene.English abbreviation is PTFE.The basic structure of polytetrafluoroethylene (PTFE) is widely used in the antiacid alkali of various needs and organic solvent for the .-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-. polytetrafluoroethylene (PTFE), itself does not have toxicity to the people, but one of raw material that uses in process of production perfluorooctanoic acid (PFOA) is considered to have carcinogenesis.
The polytetrafluoroethylene (PTFE) relative molecular mass is bigger, and low is hundreds thousand of, and high reaches more than 10,000,000, is generally millions of (degree of polymerization is at 104 orders of magnitude, and polyethylene is only 103).General degree of crystallinity is 90～95%, and melt temperature is 327～342 ℃.CF2 presses the unit zigzag fashion arrangement in the polytetrafluoroethylene (PTFE) molecule, because the fluorine atom radius is big slightly than hydrogen, so adjacent CF2 unit can not be pressed trans crossed orientation fully, but forms a spiral helicine distortion chain, fluorine atom has almost covered the surface of whole macromolecular chain.This molecular structure has been explained the various performances of polytetrafluoroethylene (PTFE).When temperature is lower than 19 ℃, form 13/6 spiral; Undergo phase transition at 19 ℃, molecule is untied a little, forms 15/7 spiral.
The polytetrafluoroethylene (PTFE) depolymerization generates only energy requirement 171.38kJ of 1mol tetrafluoroethene.So when Pintsch process, the main depolymerization of polytetrafluoroethylene (PTFE) is a tetrafluoroethene.The weight loss rate (%) of polytetrafluoroethylene (PTFE) in the time of 260,370 and 420 ℃ per hour is respectively 1 * 10-4,4 * 10-3 and 9 * 10-2.As seen, polytetrafluoroethylene (PTFE) can use at 260 ℃ long-term.Owing to also produce hypertoxic accessory substance fluorophosgene and perfluoroisobutylene etc. during Pintsch process, pay special attention to security protection and prevent polytetrafluoroethylene (PTFE) contact naked light.
Polytetrafluoroethylene (PTFE) all keeps excellent mechanical property in-196～260 ℃ wide temperature range, one of high molecular characteristics of perfluorocarbon are not become fragile at low temperature.
Resistance to chemical attack and weatherability are except that the alkali metal of fusion, and polytetrafluoroethylene (PTFE) is corroded by any chemical reagent hardly.For example at the concentrated sulfuric acid, nitric acid, hydrochloric acid, even boil in chloroazotic acid, the equal no change of its weight and performance also is dissolved in all solvents hardly, only is being dissolved in full alkane (about 0.1g/100g) more than 300 ℃ slightly.Polytetrafluoroethylene (PTFE) is nonhygroscopic, does not fire, to oxygen, the equal stabilizer pole of ultraviolet ray, so have excellent weatherability.
Electrical property: dielectric constant and the dielectric loss of polytetrafluoroethylene (PTFE) in wider frequency range is all very low, and breakdown voltage, specific insulation and arc resistance are all higher.
Radiation resistance: the radiation resistance of polytetrafluoroethylene (PTFE) relatively poor (104 rad) is subjected to cause degraded behind the high-energy radiation that high molecular electrical property and mechanical property all obviously descend.
The polymerization polytetrafluoroethylene (PTFE) is generated through radical polymerization by tetrafluoroethene.Industrial polymerisation stirs in the presence of big water gaging carries out, and in order to dispersion reaction heat, and is convenient to control temperature.Polymerization is carried out under 3～26 kilograms/centimetre 2 pressure generally at 40～80 ℃, and available inorganic persulfate, organic peroxide are initator, also can use redox initiation system.Heat release 171.38kJ during every mol of tetrafluoroethylene polymerization.Dispersin polymerization must be added the surfactant of perfluor type, for example perfluoro caprylic acid or its esters.
Use: polytetrafluoroethylene (PTFE) can adopt compression or extrude machine-shaping; Also can be made into aqueous dispersions, be used for coating, flood or make fiber.Polytetrafluoroethylene (PTFE) is widely used as high-low temperature resistant, resistant material, insulating materials, anti-stick coating etc. in industry such as atomic energy, space flight, electronics, electric, chemical industry, machinery, instrument, instrument, building, weaving, food.
Corrosion resistance: can bear alkali metal, fluorinated dielectric and the effect that is higher than all strong acid (comprising chloroazotic acid), strong oxidizer, reducing agent and various organic solvents outside 300 ℃ of NaOH except fusion.
Insulating properties: be not subjected to the influence of environment and frequency, volume resistance can reach 1018 reach ﹠amp; #8226; Centimetre, dielectric loss is little, the breakdown voltage height.
Resistant of high or low temperature: Temperature Influence is changed little, warm territory scope is wide, but serviceability temperature-190 ~ 260 ℃.
Self lubricity: having coefficient of friction minimum in the plastics, is desirable oil-free lubrication material.
The surface is viscosity not: known solid material all can not adhere to from the teeth outwards, is that a kind of surface can minimum solid material.
Resistance to weathering: radiation-resistant property and lower permeability: long term exposure is in atmosphere, and surface and property retention are constant.
Noninflammability: limited oxygen index is below 90.
Physical property: the engineering properties of polytetrafluoroethylene (PTFE) is softer.Has low-down surperficial energy.
So, carry out paste layer at the surfaces externally and internally of particularly constructing different metal for metal parts at present and can not get desirable thickness and performance, so need to improve this type of technology based on the characteristic of polytetrafluoroethylene (PTFE) and analog.
The utility model content
Technical problem to be solved in the utility model needs at the automobile application development and provides and can be the mould that the metal surfaces externally and internally carries out paste layer in a kind of high pressure draught compacting still, and the paste layer that the mould that solves prior art can't make the metal parts surfaces externally and internally is the firm defective of polytetrafluoroethylene (PTFE) particularly.
The technical scheme that its technical problem that solves the utility model adopts is: can be the mould that the metal surfaces externally and internally carries out paste layer in a kind of high pressure draught compacting still, its structure comprises the metal die in high pressure draught compacting still and the inner chamber thereof, in metal die, also be nested with elastic mould, be provided with the paste layer filler on the described elastic mould internal chamber wall and between the surfaces externally and internally of metal parts, described paste layer filler is the metal parts surfaces externally and internally and obtains needed fastening paste layer through behind the roast.
Described paste layer filler mainly is to be made of polytetrafluorethylepowder powder.
Can be the mould that the metal surfaces externally and internally carries out paste layer in a kind of high pressure draught compacting still of the present utility model, as follows with respect to its concrete beneficial effect performance of prior art:
The utility model can carry out paste layer to outside in the metal of Any shape; suit especially polytetrafluorethylepowder powder is close on the metal covering; by the protection roast, obtain to bear the positive negative pressure of qualification and temperature and not delamination obtains ideal thickness and good performance.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is further specified.
Fig. 1 is for can be the structural representation that the metal surfaces externally and internally carries out the mould of paste layer in a kind of high pressure draught compacting still of the present utility model;
Fig. 2 is for can be the structural representation of the metal parts with paste layer that is taken out that the metal surfaces externally and internally carries out the mould of paste layer in a kind of high pressure draught compacting still of the present utility model.
The specific embodiment
According to illustrated in figures 1 and 2, can be the mould that the metal surfaces externally and internally carries out paste layer in a kind of high pressure draught compacting still, its structure comprises metal die 2, the 2` in high pressure draught compacting still 1 and the inner chamber thereof, in metal die 2,2`, also be nested with elastic mould 3,3`, be provided with paste layer filler 4,5 on described elastic mould 3, the 3` internal chamber wall and between the surfaces externally and internally of metal parts, described paste layer filler 4,5 is the fastening paste layer 8,9 of metal parts surfaces externally and internally.
Described paste layer filler 4,5 mainly is to be made of polytetrafluorethylepowder powder.
By metal die 2,2` elastic mould 3,3` are protected, add paste layer filler 4,5 and putting into 1 li compacting of high pressure draught compacting still.
During to metal parts inner surface 6 paste layer fillers 4, metal die 2 outer elastic moulds 3 directly are subjected to high pressure, paste layer filler 4 compacting tightly on metal parts 6 surfaces, also can carry out paste layer filler 4,5 to metal parts surfaces externally and internally 6,7 assembling metal dies 2,2` and elastic mould 3,3` simultaneously, put into again 1 li compacting of high pressure draught compacting still form can roast paste layer filler 4,5, again by obtaining required paste layer 8,9 behind the roast.
The above embodiment is a kind of of the more preferably concrete embodiment of the present invention, and common variation that those skilled in the art carries out in the technical solution of the present invention scope and replacement all should be included in protection scope of the present invention.
Claims (2)
1, can be the mould that the metal surfaces externally and internally carries out paste layer in a kind of high pressure draught compacting still, its structure comprises metal die (2), (2`) in high pressure draught compacting still (1) and the inner chamber thereof, it is characterized in that: in metal die (2), (2`), also be nested with elastic mould (3), (3`), be provided with paste layer filler (4), (5) on described elastic mould (3), (3`) internal chamber wall and between the surfaces externally and internally of metal parts, described paste layer filler (4), (5) are fastening paste layer (8), (9) of metal parts surfaces externally and internally.
2, can be the mould that the metal surfaces externally and internally carries out paste layer in a kind of high pressure draught compacting still according to claim 1, it is characterized in that: described paste layer filler (4), (5) mainly are to be made of polytetrafluorethylepowder powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201144965U CN201253956Y (en) | 2008-05-21 | 2008-05-21 | Mould for adhibiting layer on metal inside and outside surface in high pressure air flow pressing kettle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201144965U CN201253956Y (en) | 2008-05-21 | 2008-05-21 | Mould for adhibiting layer on metal inside and outside surface in high pressure air flow pressing kettle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201253956Y true CN201253956Y (en) | 2009-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201144965U Expired - Fee Related CN201253956Y (en) | 2008-05-21 | 2008-05-21 | Mould for adhibiting layer on metal inside and outside surface in high pressure air flow pressing kettle |
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| CN (1) | CN201253956Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102476445A (en) * | 2010-11-24 | 2012-05-30 | 浙江中能防腐设备有限公司 | Hot static pressure equipment for sintering polytetrafluoroethylene or modified polytetrafluoroethylene |
| CN102476453A (en) * | 2010-11-24 | 2012-05-30 | 浙江中能防腐设备有限公司 | Cold isostatic pressing and hot isostatic pressing sintering method for polytetrafluoroethylene powder or modified polytetrafluoroethylene powder |
-
2008
- 2008-05-21 CN CNU2008201144965U patent/CN201253956Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102476445A (en) * | 2010-11-24 | 2012-05-30 | 浙江中能防腐设备有限公司 | Hot static pressure equipment for sintering polytetrafluoroethylene or modified polytetrafluoroethylene |
| CN102476453A (en) * | 2010-11-24 | 2012-05-30 | 浙江中能防腐设备有限公司 | Cold isostatic pressing and hot isostatic pressing sintering method for polytetrafluoroethylene powder or modified polytetrafluoroethylene powder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090610 Termination date: 20120521 |