CN1482638A - Process for preparation of copper-based powder electrical contact - Google Patents
Process for preparation of copper-based powder electrical contact Download PDFInfo
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- CN1482638A CN1482638A CNA031325351A CN03132535A CN1482638A CN 1482638 A CN1482638 A CN 1482638A CN A031325351 A CNA031325351 A CN A031325351A CN 03132535 A CN03132535 A CN 03132535A CN 1482638 A CN1482638 A CN 1482638A
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Abstract
A process for preparing copper group powdered electrical contact comprising, hot extrusion, through which a big blank is squeezed into sheet material or steel bar at a temperature of 700-750 degree C, and extrusion ratio of 20%-30%, then performing multiple cold deformation reinforcement through sheet material rolling or shredded material drawing, with the cold deformation reinforcement total deflection of 70-90%, finally forming the contactor member through stamping or cold heading deformation. The method by the invention increases the reliability and durability for the switches.
Description
Technical field: the present invention relates to the preparation method of a kind of iec switch, belong to the powder metallurgy field with contact element.
Background technology: the break contact of medium current and high-current switch electrical equipment, normally make by the composite material of powder metallurgy process manufacturing.Contact is to work under the rigor condition of the dynamic loads that repeatedly circulate such as impact and local arcing, and this condition has proposed high requirement to its mechanical stability and arc ablation resistance.One of important indicator that wherein characterizes the electric contacts quality is the work persistence under rigor condition, and the residual porosity rate that is exactly the powder contact should be very low, and in other words, its relative density should be very high.As everyone knows, even the low magnitude to 1-1.5% of the content of residual porosity rate also can reduce contact, so that the useful life of electrical equipment.Porosity also can reduce the conductance and the mechanical strength of material simultaneously, and its serviceability is worsened.At present, when utilizing the powder constituent element to prepare low-voltage electrical apparatus to use electrical contact, the production method of extensive use is to comprise following basic technology link: mixed-powder preparation, cold moudling of contact blank and sintering, densification, annealing.The purpose of densification link is to reduce residual porosity rate (the blank porosity behind the sintering is generally 15-20%), be the contact blank after the sintering to be carried out the cold deformation processing in principle by multiple the pressure, pressure is generally 800-1000MPa again, but this link can not guarantee the residual porosity rate and reach desired level that this point is obvious to copper-based electrical contact In-particular.Also some method suggestion, the porosity during for reduction contact sintering can be introduced the additive with activated sintering effect in mixed-powder, but the undercapacity of finished parts under this condition.At present, utilize multiple the pressure and intermediate heat-treatment technology, making the contact blank repeatedly be out of shape with the method that reaches densification has been a kind of process of maturation, but the shortcoming of this method is, adopt multiple the pressure twice, even three multiple pressures, porosity still can not be reduced to the following level of 1-1.5%.
Summary of the invention: the preparation method who the object of the present invention is to provide a kind of imporous Cu-base powder electrical contact, it comprises following preparation process: mixed-powder preparation, the cold moudling of contact blank, sintering, densification, annealing, densification process is depth pressure deformation process repeatedly: at first be hot extrusion, big blank is extruded into sheet material or bar, temperature is 700～750 ℃, and extrusion ratio is 20～30; Carry out the cold deformation strengthening of multi-pass by plate rolling or the drawing of silk material then, the cold deformation strengthening total deformation is 70～90%; Finally make contact members by punching press or cold-heading distortion.Utilize method of the present invention to produce and be close to imporous electrical contact, thereby the quality of electrical contact is improved, method of the present invention has improved the reliability and the persistence of device for switching, it is improved the working life of contact elements, some other serviceability is improved, as the contact resistance between mechanical strength, conductivity and the symmetrical contact pair.By densification process of the present invention, can guarantee that electrical contact is efficient closely knit to theoretical density, obtain the high-quality contact, in this external efficient plastic history, crystal grain and the refinement of forming mutually can take place also, thereby improved the quality of electrical contact.
Embodiment: present embodiment comprises following preparation process: mixed-powder preparation, the cold moudling of contact blank, sintering, densification, annealing, the chemical composition of mixed-powder (weight ratio) is: 1.2% cadmium, 2.0% niobium, 0.5% diamond, all the other are copper.Concrete steps are: at first Cu-base powder is mixed, in being the closed mould of 300MPa, pressure is cold-pressed into blank, blank is incubated 1～2 hour sintering after the moulding under 900 ℃ of conditions in the protective atmosphere sintering furnace, blank behind the sintering reaches densification by depth pressure deformation process repeatedly, densification process is: (1) hot extrusion, big blank is extruded into sheet material, and temperature is 700～750 ℃, and extrusion ratio is 20; (2) plate rolling distortion, rolling total deformation is 70%, and the single drafts is no more than 10%, and deflection reaches about 30% and carries out an intermediate annealing, and the intermediate annealing temperature is 500～550 ℃; (3) be rolled down near the strip of product thickness size and finally make contact members by punch process.At last, the finished product contact is incubated 0.5 hour and anneals under 500 ℃ condition, promptly get the Cu-base powder electrical contact.
For the ease of contrast test, utilize existing traditional typical process (twice multiple pressure, compacting pressure is 1100MPa, the intermediate annealing temperature is 500 ℃) and this method to prepare the Cu-base composites contact elements.The integrated artistic link is: mixed-powder preparation, blank forming (compacting pressure is 300MPa), blank sintering (sintering temperature is 900 ℃, temperature retention time 1h), finished product contact annealing (500 ℃ of annealing temperatures, temperature retention time 0.5h).Two kinds of above-mentioned technological parameters of method are identical.
| Method | Relative density, d/d m％ | ????ρ，μΩ·cm | ????HB，MPa | ????R K，mΩ | G, μ g/ time |
| Current methods | ????98.70 | ????2.84 | ????680 | ????14.9 | ????115 |
| This method | ????99.96 | ????2.78 | ????770 | ????11.8 | ????81 |
By in the table as seen, relative density and hardness number that this method prepares contact are relatively high, the contact resistance between resistivity and the symmetrical contact pair is relatively low, and ablation resistance raising. These all come from the reduction of residual porosity rate and the optimization of tissue. Compare with current methods, this method can improve reliability and the persistence of electric appliance switch contact spare.
Claims (2)
1, a kind of preparation method of Cu-base powder electrical contact, it comprises following preparation process: mixed-powder preparation, the cold moudling of contact blank, sintering, densification, annealing, it is characterized in that densification process is depth pressure deformation process repeatedly: at first be hot extrusion, big blank is extruded into sheet material or bar, temperature is 70～750 ℃, and extrusion ratio is 2～30; Carry out the cold deformation strengthening of multi-pass by plate rolling or the drawing of silk material then, the cold deformation strengthening total deformation is 70～90%; Finally make contact members by punching press or cold-heading distortion.
2, the preparation method of Cu-base powder electrical contact according to claim 1; the preparation process that it is characterized in that it is: at first Cu-base powder is mixed; in being the closed mould of 300MPa, pressure is cold-pressed into blank; moulded blank is incubated 1～2 hour sintering under 900 ℃ of conditions in the protective atmosphere sintering furnace; blank behind the sintering reaches densification by depth pressure deformation process repeatedly; at last; the finished product contact is incubated 0.5 hour and anneals under 500 ℃ condition, promptly get the Cu-base powder electrical contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03132535 CN1209778C (en) | 2003-07-29 | 2003-07-29 | Process for preparation of copper-based powder electrical contact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03132535 CN1209778C (en) | 2003-07-29 | 2003-07-29 | Process for preparation of copper-based powder electrical contact |
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| Publication Number | Publication Date |
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| CN1482638A true CN1482638A (en) | 2004-03-17 |
| CN1209778C CN1209778C (en) | 2005-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 03132535 Expired - Fee Related CN1209778C (en) | 2003-07-29 | 2003-07-29 | Process for preparation of copper-based powder electrical contact |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831571A (en) * | 2010-05-31 | 2010-09-15 | 福达合金材料股份有限公司 | Silver-nickel-based electrical contact material and preparation method thereof |
| CN102024592A (en) * | 2010-12-02 | 2011-04-20 | 江苏德春电力科技有限公司 | Preparation technology for fixed contact |
| CN102162045A (en) * | 2011-03-29 | 2011-08-24 | 温州银泰合金材料有限公司 | Electrical contact based on powdered copper and manufacturing process thereof |
| CN103100715A (en) * | 2013-01-18 | 2013-05-15 | 中南大学 | Method for processing Beryllium copper plate strip for secondary electronic emission |
| CN104959609A (en) * | 2015-06-05 | 2015-10-07 | 东睦新材料集团股份有限公司 | Preparation method of copper-base powder metallurgy part |
| CN108339199A (en) * | 2017-01-23 | 2018-07-31 | 贺利氏德国有限责任两合公司 | Electrical casing with contact element and its production method |
| CN110508801A (en) * | 2019-08-20 | 2019-11-29 | 湖南省美程陶瓷科技有限公司 | A kind of new energy resource power battery relay contact material and preparation method thereof |
-
2003
- 2003-07-29 CN CN 03132535 patent/CN1209778C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831571A (en) * | 2010-05-31 | 2010-09-15 | 福达合金材料股份有限公司 | Silver-nickel-based electrical contact material and preparation method thereof |
| CN101831571B (en) * | 2010-05-31 | 2012-03-28 | 福达合金材料股份有限公司 | Silver-nickel-based electrical contact material and preparation method thereof |
| CN102024592A (en) * | 2010-12-02 | 2011-04-20 | 江苏德春电力科技有限公司 | Preparation technology for fixed contact |
| CN102162045A (en) * | 2011-03-29 | 2011-08-24 | 温州银泰合金材料有限公司 | Electrical contact based on powdered copper and manufacturing process thereof |
| CN102162045B (en) * | 2011-03-29 | 2013-04-03 | 温州银泰合金材料有限公司 | Electrical contact based on powdered copper and manufacturing process thereof |
| CN103100715A (en) * | 2013-01-18 | 2013-05-15 | 中南大学 | Method for processing Beryllium copper plate strip for secondary electronic emission |
| CN103100715B (en) * | 2013-01-18 | 2017-06-06 | 中南大学 | A kind of processing method of Beryllium copper plate strip for secondary electronic emission |
| CN104959609A (en) * | 2015-06-05 | 2015-10-07 | 东睦新材料集团股份有限公司 | Preparation method of copper-base powder metallurgy part |
| CN108339199A (en) * | 2017-01-23 | 2018-07-31 | 贺利氏德国有限责任两合公司 | Electrical casing with contact element and its production method |
| CN108339199B (en) * | 2017-01-23 | 2021-08-13 | 贺利氏德国有限责任两合公司 | Electrical bushing with contact element and method for producing the same |
| CN110508801A (en) * | 2019-08-20 | 2019-11-29 | 湖南省美程陶瓷科技有限公司 | A kind of new energy resource power battery relay contact material and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1209778C (en) | 2005-07-06 |
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