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Silver base rare earth alloy contact material for low-voltage switch electric appliance and method for preparing same

A low-voltage switch, rare earth alloy technology, applied in contact materials, electric switches, circuits, etc., can solve the problems of poor operating characteristics, low resistivity, and low electrical life of switches, and achieve low contact temperature rise and electronegativity Low, enhanced density and performance effects

Inactive Publication Date: 2008-02-13
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it was found in the application that Ag / SnO 2 The contact resistance and temperature rise of Ag / CdO are higher than that of Ag / CdO under the same conditions; in addition, it has been found in contactor applications in recent years that Ag / SnO 2 Working under the AC3 condition specified in the JB2455-85 standard of the Ministry of Machinery Industry, its electrical life is lower than that of Ag / CdO
CN1085346A " low resistivity Ag / SnO 2 Electrical contact material and its preparation", CN1425782A "doped metal oxide silver-tin dioxide electrical contact material and its preparation method" and CN86103279A "internal silver oxide-tin oxide alloy electrical contact material and its manufacturing method" The disclosed Ag / SnO 2 Contact materials also have the disadvantages of higher contact resistance and temperature rise than Ag / CdO under the same conditions and lower electrical life than Ag / CdO
The patent is not a silver-metal oxide contact material, the switch operating characteristics are poor

Method used

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  • Silver base rare earth alloy contact material for low-voltage switch electric appliance and method for preparing same
  • Silver base rare earth alloy contact material for low-voltage switch electric appliance and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, mix Ag chips, La chips, Sn chips and Bi chips according to the composition ratio, mix them evenly, and add HNO 3 Until all is dissolved, a mixed solution is obtained, and then solid Na is added as a co-precipitant 2 CO 3 , Control PH=8~9, make the mixed liquid be SnO 2 Co-precipitation occurs with particles as the core until SnO 2 Uniformly dispersed Ag with particles as the core 2 CO 3 , La 2 (CO 3 ) 3 And Bi 2 (CO 3 ) 3 The co-precipitate is completely precipitated, the co-precipitate is filtered with deionized water, washed, dried, and then calcined at 420°C to obtain Ag / La 2 O 3 +SnO 2 +Bi 2 O 3 Composite powder, then combine the obtained Ag / La 2 O 3 +SnO 2 +Bi 2 O 3 The composite powder is processed into a compact with the required shape and size by the ordinary compression molding method. At this time, the total pressing pressure is 30 tons, and the compact is solid-phase sintered. The sintering temperature is 900 ℃, and the final pressure is 40 tons. The sinte...

Embodiment 2

[0028] First, mix Ag chips, Ce chips, Sn chips and Bi chips according to the composition ratio, mix them evenly, and add HNO 3 Until all is dissolved, a mixed solution is obtained, and then solid Na is added as a co-precipitant 2 CO 3 , Control PH=8~9, make the mixed liquid be SnO 2 Co-precipitation of the particles as the core until uniformly dispersed Ag is obtained 2 CO 3 , Ce 2 (CO 3 ) 3 And Bi 2 (CO 3 ) 3 Until the coprecipitate is completely precipitated, the coprecipitate is filtered with deionized water, washed, dried, and then calcined at 420°C to obtain Ag / Ce 2 O 3 +SnO 2 +Bi 2 O 3 Composite powder, then combine the obtained Ag / Ce 2 O 3 +SnO 2 +Bi 2 O 3 The composite powder is processed into compacts with the required shape and size by ordinary compression molding. At this time, the total pressing pressure is 30 tons, and the compact is solid-phase sintered. The sintering temperature is 920 ℃, and the final pressure is 40 tons. The sintered compact is post-processed by t...

Embodiment 3

[0031] First, mix Ag chips, Pr chips, Sn chips and In chips according to the composition ratio, mix them evenly, and add HNO 3 Until all is dissolved, a mixed solution is obtained, and then solid Na is added as a co-precipitant 2 CO 3 , Control PH=8~9, make the mixed liquid be SnO 2 Co-precipitation occurs with particles as the core until SnO 2 Uniformly dispersed Ag with particles as the core 2 CO 3 , Pr 2 (CO 3 ) 3 And In 2 (CO 3 ) 3 The co-precipitate is completely separated out, the co-precipitate is filtered with deionized water, washed, dried, and then calcined at 420 ℃ to obtain Ag / Pr 2 O 3 +SnO 2 +In 2 O 3 Composite powder, then combine the obtained Ag / Pr 2 O 3 +SnO 2 +In 2 O 3 The composite powder is processed into a compact with the required shape and size by the ordinary compression molding method. At this time, the total pressing pressure is 30 tons, and the compact is solid-phase sintered. The sintering temperature is 900 ℃, and the final pressure is 40 tons. The sint...

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Abstract

This invention relates to a silver-based rare earth alloy touch material used in low voltage switch appliance and its process method. Its chemical components are the following: rare earth metal oxide x=1~7 %; Me oxide y=1~3 %; SnO#-[2] z=(12-x-y)%; the rest is metal silver, wherein the rare earth metals are La,Ce,Pr or Nd and Me as Bi,In,Sb or T1. Its process method is as following: to use che mical co-precipitation to make powder and to shape and sinter the deposited powder.

Description

Technical field [0001] The technical scheme of the present invention relates to electrical switch contacts distinguished by materials used, specifically, silver-based rare earth alloy electrical switch contact materials. Background technique [0002] The advanced nature of low-voltage switchgear is mainly marked by its high reliability and long working life. The contacts of switching appliances, especially the contact materials, are the key to ensuring high reliability and long life. Silver-metal oxide contact material has excellent switching characteristics, so it has become a type of contact material widely used in low-voltage electrical appliances. The electrical contact is the element that directly undertakes the making and breaking of the circuit in the switching equipment, and it plays a decisive role in the safe operation of the switching equipment. With the rapid development of modern industry, the load on the high-voltage transmission network is increasing, and the autom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H1/02H01H11/04C22C5/06C22C1/00C22C1/04
Inventor 王景芹温鸣王海涛陆俭国赵靖英王宝珠张云峰
Owner HEBEI UNIV OF TECH
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