CN102467986A - Arc erosion-resistant electric contact material of silver-based cadmium-free composite material - Google Patents
Arc erosion-resistant electric contact material of silver-based cadmium-free composite material Download PDFInfo
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- CN102467986A CN102467986A CN2010105353800A CN201010535380A CN102467986A CN 102467986 A CN102467986 A CN 102467986A CN 2010105353800 A CN2010105353800 A CN 2010105353800A CN 201010535380 A CN201010535380 A CN 201010535380A CN 102467986 A CN102467986 A CN 102467986A
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Abstract
The invention relates to an arc erosion-resistant electric contact material of a silver-based cadmium-free composite material. The electric contact material is a Ag-(SnO2+In2O3) composite material comprising 9 to 11 weight percent of (SnO2+In2O3) or a Ag-Cu oxide composite material comprising 15 to 25 weight percent of Cu oxide. According to the electric contact material, the Vickers hardness (Hv) value is 100 to 150; the contact resistance is 5 to 60 mohm under the conditions that the testing current is 1 to 5 amperes and the voltage is 10 to 20 volts; and the arc erosion resistance can reach 2*10<3> to 10*10<3> times. When the electric contact material is applied to the surface of a metal bottom material of an electric connector, the formed electric contact has high hardness and low contact resistance and can effectively maintain the arc erosion-resistant wear resistance.
Description
Technical field
The present invention relates to a kind of electric contact material, particularly a kind of have under high rigidity, the abrasion performance character, still has concurrently than the low contact resistance characteristic, can keep the money base of preferable arc resistant erosion ability-the do not contain electric contact material of cadmium composite wood.
Background technology
At present, electric contact material extensively applies to various need and electrically contacts the field that could implement running.For example communication transmission system or power supply output control, electronic instrument connection and calculator (computer) periphery etc.Generally operate moment at electric connector or relay switch; Because the spacing of its two electrode contact when being about to contact or separation just is less; So keeping under the environment of high Electric Field Distribution; Electric current between its two electric contact can produce electric discharge phenomena in view of the above, and then forms the physical phenomenon of so-called " electric arc ".
In general, in electric arc erosion process, the transfer of quality of materials between two electric contacts be can cause, and convexity or indentations formed on the electric contact surface; Or because formed more coarse surface is solidified again because of metal melting after the electric arc erosion in the surface; And other reason pollution or the breakoff phenomenon that produce, all can make former electrical contact surface lose smooth and cause contact resistance value to promote, and then influence the task performance of electric contact.
In practical application, generally use platinum to be material more, still, the platinum cost is too high, and therefore just useful copper replaces the trend of platinum.Yet though advantages such as the high conduction of copper tool, heat, low cost form oxide on the copper surface easily, therefore, also having the money base material that proposes to have with the copper same advantage is material.Yet though silver can be anti-oxidant, its intensity is lower, resistance to wear is not good, and electric arc erosion phenomenon is serious, and is unfavorable for the application of long-time electric contact material.High conduction, high heat conduction, corrosion-resistant have appearred having in the later stage, and the CdO/Ag than the tool economy that can conduct bigger electric current contacts material, and use it on heavy type or high utmost point switch, the relay.Yet Cd has strong toxicity and European Union formally through WEEE and RoHS proposal, bans use of the electronic product of all kinds of tool high toxic materials, Cd for example, Pb etc.
Also have a kind of AuCo electric contact material, after this electric contact material was tested through 500 electric arc erosions, its material surface was prone to serious breakoff phenomenon, and life of product is not long.
Summary of the invention
The object of the present invention is to provide the big electric current of a kind of conduction, have preferable corrosion resistance and contact material hardness, can meet the electric contact material of international avirulence material regulation again, thereby overcome the defective of prior art electric contact material.
The present invention overcomes these defectives through following technical scheme:
But a kind of money base of arc resistant erosion-do not contain electric contact material of cadmium composite wood; It is characterized in that: the dimension formula hardness number (Hv) of this electric contact material is 100～150; And in measuring current is under 1～5 ampere, 10～20 volts conditions; Its contact resistance value is 5～60mohm (milliohm), and this arc resistant erosion ability can reach 2*10
3～10*10
3Number of times; When this electric contact material was used for electric connector metal substrate surface, formed two kinds of electric contacts can effectively be kept arc resistant erosion ability under the low contact resistance condition.
Wherein, this electric contact material is by Ag-(SnO
2+ In
2O
3) the composite wood composition.This Ag-(SnO wherein
2+ In
2O
3) (the SnO of composite wood
2+ In
2O
3) the composition proportion is by weight 9～11%.
Wherein this electric contact material also can be made up of Ag-Cu oxide (oxide) composite wood.Wherein Cu oxide (oxide) the composition proportion of this Ag-Cu oxide (oxide) composite wood is by weight 15～25%.
But the money base of arc resistant erosion of the present invention-the do not contain electric contact material of cadmium composite wood; Meet useless household electrical appliances (WEEE) of the European Economic Community (EC) and RoHS decree regulations; This contact material is with advantages such as the big electric current of conduction, preferable corrosion resistance and lifting contact material hardness simultaneously; Effectively reduce the arc erosion effect, and reached the low contact resistance target, significantly promoted the useful life of product.
Description of drawings
Figure 1A is the appearance surfaces figure () of existing AuCo electric contact material connector after 500 electric arc erosions test;
Figure 1B is the appearance surfaces figure (two) of existing AuCo electric contact material connector after 500 electric arc erosions test;
Fig. 2 A is the appearance surfaces figure () of AgSnIn electric contact material of the present invention connector after 5000 electric arc erosions test;
Fig. 2 B is the appearance surfaces figure (two) of AgSnIn electric contact material of the present invention connector after 5000 electric arc erosions test;
Fig. 3 A is the appearance surfaces figure () of AgCu electric contact material of the present invention connector after 2000 electric arc erosions test;
Fig. 3 B is the appearance surfaces figure (two) of AgCu electric contact material of the present invention connector after 2000 electric arc erosions test;
Fig. 4 is the SEM microphotogram of electric contact material tissue of the present invention.
Embodiment
Below in conjunction with accompanying drawing, do more detailed explanation with other technical characterictic and advantage to the present invention is above-mentioned.
Because electrical pickoff is in the moment of opening circuit, electric current can be compelled from a little but still the electric contact that is communicated with passes through, and can produce the electric arc effect in the contact of conducting on than small size this moment, and the current density that it passes through reaches as high as 5*10
4A/cm
2, therefore also can cause contact point place temperature to raise fast, thereby and cause powerful magnetic field accelerated electron or negative ions moves, cause more serious electric arc erosion effect.Therefore, in order to reduce the generation of these breakoff phenomenons, its electric contact material should possess higher electrical conductivity, generates less heat energy when electric current is passed through, and is softening in order to what avoid high temperature to cause, and then influences the intensity performance of material; And electric contact material also can effectively conduct dispersion with the heat on the electric contact if having the preferable capacity of heat transmission, and reason is not overheated makes material damage and reduce the influence that is caused because of the electric arc effect.In addition; Electric contact material uses under the environment of all kinds of corrosive gass mostly; Therefore the corrosion resistance or the non-oxidizability of electric contact material also are to use one of characteristic of requirement; Situation to avoid on material surface forming non-conductive compound or oxide takes place, and is unlikely to so causes contact resistance value to rise and useful life of reducing material.Generally in the moment that electric contact opens or closes, have mutual wearing and tearing mechanically usually, its electric contact material surface of getting off for a long time also can be damaged.Therefore, hard or also be to use one of important document of requirement than the electric contact material of tool resistance to wear.
Yet, above-mentioned these characteristic materials that require such as harder or more wear-resisting, generally, the performance of its rerum natura also more is attended by higher contact resistance value, so the present invention provides the contact material that can satisfy these requirements haply and have these characteristics concurrently.In view of the above, see also table 1, table 1 is rerum natura and the difference of arc resistant erosion ability between two kinds of materials of the present invention and the conventional contact material.Table 1 each item index is at 1-5A, measures under the condition of 10-20V.
Table 1
Can know by table 1, but the electric contact material of the money base of arc resistant erosion of the present invention-do not contain cadmium composite wood does not contain Toxic matter the standard that meets in the world to be discussed and decided.In addition, utilize silver can reach above-mentioned requirement than the high perveance or the preferable capacity of heat transmission for base material.The dimension formula hardness number (Hv) of this electric contact material also can reach 100～150 simultaneously, effectively presents the wear-resisting characteristic that requires.In addition, for current material have preferable hardness the time, the predicament that its contact resistance but rises thereupon, electric contact material of the present invention also is improved.As above show saidly, these two kinds of materials have under the characteristic of high rigidity, also have the lower contact resistance value between 5～60mohm (milliohm) concurrently.For example with Ag-(SnO
2+ In
2O
3) composite wood, and wherein should (SnO
2+ In
2O
3) the composition proportion is by weight 9～11%, or with Ag-Cu oxide (oxide) composite wood, and wherein this Cu oxide composition proportion for 15～25% all being like this by weight.Simultaneously, SnO
2With In
2O
3Interpolation, also can reach and scatter strengthen, the effect of elevating mechanism character, SnO simultaneously
2At high temperature be difficult for decomposing, and can increase material viscosity and then protection money base material, reduce the money base material and cause the loss of volume because of suffering the electric arc erosion.And compared to the traditional electrical contactor material, be example with the AuCo alloy for example, though its hardness number is higher than material of the present invention, its contact resistance also is increased to 50～100mohm (milliohm), will cause the comparatively serious damage of materials of arc discharge process like this.And the experimental implementation of the Vickers hardness number of mentioning here can be passed through the following Hv=1.584*P of relation (Kg)/d
2(mm
2) measure.Wherein the P value can be learnt by loading (load); This d value can multiply by loading speed by loading time to be learnt, and this explanation.
The arc resistant erosion ability of these two kinds of materials can reach 2*10
3～10*10
3Number of times, compared to about 500 times arc resistant erosion ability of current material, material of the present invention has significantly promoted the useful life of product.Thus, electric contact material of the present invention has lower contact resistance value when being used for electric connector metal substrate surface, can effectively keep the arc resistant erosion.For the test of electric arc erosion ability, experimentally utilize single arc erosion test of spacing or repeatedly electric arc erosion test mostly.Wherein, the single arc erosion of spacing is different from repeatedly electric arc erosion.Repeatedly the electric arc erosion is the simulation test that approaches the damage under the real electric contact operation.For example repeatedly in the electric arc erosion process, will comprise the impact test back and forth of successional electric arc erosion and electric contact; As for the single arc erosion of spacing, then be more simply, research method fast, be situation and the process that is used for understanding the electric arc erosion.For example negative electrode and anode are kept constant spacing,, avoided mechanical contact injury simultaneously with the discharge type erosion material surface that energy is quite concentrated, and this explanation.
Shown in Fig. 2 A, 2B and 3A, 3B, be respectively AgSnIn electric contact material of the present invention through the appearance surfaces figure () (two) of connector after 5000 electric arc erosions test and the appearance surfaces figure () (two) of AgCu electric contact material of the present invention connector after 2000 electric arc erosions test.Can be known that by figure electric contact material of the present invention is after electric arc erosion test, preferable flatness and integrity degree still can be kept in its surface, and preferable hardness can make material can avoid receiving the destruction of electric arc erosion.Fig. 4 is the SEM microphotogram of electric contact material tissue of the present invention.Especially observe from the tangent plane of electron microscope and can know that additive material behavior of the present invention can effectively be dispersed in the money base material, strengthen, strengthen the effect of mechanical endurance matter thereby reach to promote to scatter.
But the electric contact material of the money base of arc resistant erosion of the present invention-do not contain cadmium composite wood meets useless household electrical appliances (WEEE) of the European Economic Community (EC) and RoHS decree regulations; This contact material is with advantages such as the big electric current of conduction, preferable corrosion resistance, resistance to wear and lifting contact material hardness simultaneously; Can effectively reduce the destruction that the arc erosion effect is caused; And reach the target of low contact resistance value, can significantly promote all kinds ofly has the useful life of electric contact requirement product and has the whole applicability that is used for each field goods.
The above is merely preferred embodiment of the present invention, only is illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art is understood, and in spirit that claim of the present invention limited and scope, can carry out many changes to it, revise, in addition equivalent, but all will fall in protection scope of the present invention.
Claims (5)
1. but the money base of an arc resistant erosion-the do not contain electric contact material of cadmium composite wood; It is characterized in that: the dimension formula hardness number (Hv) of this electric contact material is 100～150; And in measuring current is under 1～5 ampere, 10～20 volts conditions; Its contact resistance value is 5～60mohm (milliohm), and this arc resistant erosion ability reaches 2*10
3～10*10
3Number of times.
2. electric contact material according to claim 1 is characterized in that: this electric contact material is by Ag-(SnO
2+ In
2O
3) composite wood forms.
3. electric contact material according to claim 2 is characterized in that: this Ag-(SnO
2+ In
2O
3) (the SnO of composite wood
2+ In
2O
3) the composition proportion is by weight 9～11%.
4. electric contact material according to claim 1 is characterized in that: this electric contact material is made up of Ag-Cu oxide (oxide) composite wood.
5. electric contact material according to claim 4 is characterized in that: wherein the Cu oxide components proportion of this Ag-Cu oxide composite wood is by weight 15～25%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105353800A CN102467986A (en) | 2010-11-04 | 2010-11-04 | Arc erosion-resistant electric contact material of silver-based cadmium-free composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105353800A CN102467986A (en) | 2010-11-04 | 2010-11-04 | Arc erosion-resistant electric contact material of silver-based cadmium-free composite material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102467986A true CN102467986A (en) | 2012-05-23 |
Family
ID=46071502
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105353800A Pending CN102467986A (en) | 2010-11-04 | 2010-11-04 | Arc erosion-resistant electric contact material of silver-based cadmium-free composite material |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0520949A (en) * | 1991-07-12 | 1993-01-29 | Furukawa Electric Co Ltd:The | Electric contact point material and manufacture thereof |
| CN1302339A (en) * | 1999-07-07 | 2001-07-04 | 田中贵金属工业株式会社 | Electric contact material for automobile relay |
| CN1606112A (en) * | 2003-10-10 | 2005-04-13 | 田中贵金属工业株式会社 | High-voltage loaded switch device |
| CN101415644A (en) * | 2006-03-31 | 2009-04-22 | 尤米科尔股份有限公司 | Process for manufacture of silver-based particles and electrical contact materials |
| JP4427058B2 (en) * | 2004-06-18 | 2010-03-03 | Ｔａｎａｋａホールディングス株式会社 | Sealed AC load relay and Ag contact element material used therefor |
-
2010
- 2010-11-04 CN CN2010105353800A patent/CN102467986A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0520949A (en) * | 1991-07-12 | 1993-01-29 | Furukawa Electric Co Ltd:The | Electric contact point material and manufacture thereof |
| CN1302339A (en) * | 1999-07-07 | 2001-07-04 | 田中贵金属工业株式会社 | Electric contact material for automobile relay |
| CN1606112A (en) * | 2003-10-10 | 2005-04-13 | 田中贵金属工业株式会社 | High-voltage loaded switch device |
| JP4427058B2 (en) * | 2004-06-18 | 2010-03-03 | Ｔａｎａｋａホールディングス株式会社 | Sealed AC load relay and Ag contact element material used therefor |
| CN101415644A (en) * | 2006-03-31 | 2009-04-22 | 尤米科尔股份有限公司 | Process for manufacture of silver-based particles and electrical contact materials |
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Application publication date: 20120523 |