Silver rare earth oxide contact material for low-voltage switching device and preparation method thereof

A rare earth oxide, low-voltage switch technology, applied in the direction of electric switches, contacts, circuits, etc., can solve the problem of low electrical life, achieve the effect of improving electrical conductivity, fine particles, and solving the effect of easy fracture after drawing

Inactive Publication Date: 2014-11-26
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 AC3 conditions, its electrical life is lower than that of Ag / CdO

Method used

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  • Silver rare earth oxide contact material for low-voltage switching device and preparation method thereof
  • Silver rare earth oxide contact material for low-voltage switching device and preparation method thereof
  • Silver rare earth oxide contact material for low-voltage switching device and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare an ethanol distilled aqueous solution with a volume ratio of distilled water and ethanol of 1:1 as a solvent, and prepare a sufficient amount of diluted ammonia water with a mass concentration of 10%. Take by weighing tin chloride pentahydrate, lanthanum chloride and titanium chloride powder by mass ratio 90:5:5, it is dissolved in the ethanol distilled aqueous solution above respectively, is formulated into the solution of 0.2mol / L respectively, then three All the solutions were mixed, and placed on a magnetic stirrer platform to stir to make them uniform, and the precursors of tin, lanthanum and titanium were obtained. Add polyethylene glycol (molecular weight 400) with a volume percentage of 2% of the mixed solution dropwise into the solution as a dispersant. After the temperature rose to 65°C, keep stirring for 20 minutes.

[0031] After stirring evenly, add dropwise ammonia water with a mass ratio of 10%-12% until the solution becomes gelatinous (at this tim...

Embodiment 2

[0046] The difference is that ytterbium chloride replaces lanthanum chloride, and tin chloride pentahydrate, ytterbium chloride and titanium chloride powder are weighed in a mass ratio of 94:3:3. The rest is the same.

[0047] Using powder metallurgy process, according to Ag:SnO 2 / Tb 2 o 3 -TiO 2 =85:15 (mass ratio) mixing, cold pressing-sintering-repressing-extrusion-drawing to make silver rare earth oxide contact material.

[0048] Alloy performance indicators:

[0049] Resistivity 2.43μΩ.cm

[0050] Density 9.86 g / cm 3

[0051] Hardness 970 MPa

Embodiment 3

[0053] The difference is that europium chloride replaces lanthanum chloride. Weigh tin chloride pentahydrate, europium chloride and titanium chloride powders in a mass ratio of 90:5:5. The rest is the same.

[0054] Using powder metallurgy process, according to Ag:SnO 2 / Eu 2 o 3 -TiO 2 =90:10 (mass ratio) mixing, cold pressing-sintering-repressing-extrusion-drawing to make silver rare earth oxide contact material.

[0055] Alloy performance indicators:

[0056] Resistivity 2.39μΩ.cm

[0057] Density 9.82 g / cm 3

[0058] Hardness 978 MPa

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Abstract

The invention relates to a sol-gel preparation method for a silver rare earth oxide contact material for a low-voltage switching device. The material chemically comprises a rare earth oxide, an oxide of Me, SnO2 and metallic silver. Mass percentage of each oxide accounting for total mass of the oxide is 1-5% of rare earth oxide, 1-5% of oxide of Me, and the balance SnO2. The mass percentage of a sum of mass of the three kinds of oxide to the mass of metallic silver is oxide: silver=85-95:15-5. The silver rare earth oxide contact material for the low-voltage switching device does not contain Cd, is not toxic and environment-friendly, prolongs service life of a contact, and has high hardness, density and conductivity, and therefore contact performance and reliability of electrical devices are improved.

Description

technical field [0001] The technical solution of the invention relates to electrical switch contacts distinguished by materials used, in particular to a sol-gel preparation method of silver rare earth oxide contact materials for low-voltage switch appliances. 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 ensure their high reliability and long life. Silver-metal oxide contact material has excellent switching operation characteristics, so it has become a kind of contact material widely used in low-voltage electrical appliances. The electric contact is the component in the switchgear that is directly responsible for making and breaking the circuit, and it plays a decisive role in the safe operation of the switchgear. With the rapid development of modern industry, the load of high-voltage transmissi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H1/0237C22C32/00C22C5/06C22C1/05
Inventor 王景芹王海涛朱艳彩
Owner HEBEI UNIV OF TECH
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