Chemical coprecipitation preparation of nano-rave-earth blend AgSnO2 electric contacting alloy and its process

A technology of chemical co-precipitation and nano-rare earth, which is applied in circuits, electrical switches, electrical components, etc.

Inactive Publication Date: 2005-08-10
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technologies have certain limitations in terms of electrical properties of electrical contact materials, contact burnout rate and service life.

Method used

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  • Chemical coprecipitation preparation of nano-rave-earth blend AgSnO2 electric contacting alloy and its process
  • Chemical coprecipitation preparation of nano-rave-earth blend AgSnO2 electric contacting alloy and its process
  • Chemical coprecipitation preparation of nano-rave-earth blend AgSnO2 electric contacting alloy and its process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1, preparation of SnO by co-precipitation 2 / MgO / La precursor, at 400 ° C, 1 h to prepare nano-amorphous SnO with a weight ratio of 10:1:2 2 / MgO / La chemical co-precipitation mixed oxide powder. Silver powder (Ag) with a weight ratio of 88%, SnO with 12% 2 / MgO / La hybrid powders were high energy ball milled in air environment. A vibrating ball mill is used, the ball-to-material ratio is 20:1, the ball milling time is 1 hour, and the vibration frequency is 200s -1 . The ball-milled powder is cold-pressed at 200MPa to form an embryo, hot-pressed and sintered at 550°C and 200MPa, and then re-pressed and annealed to shape. Prepared AgSnO 2 / MgO / La contact alloy is nano-amorphous SnO 2 / MgO / La particles are uniformly distributed in the Ag matrix.

Embodiment 2

[0026] Embodiment 2, coprecipitation prepares SnO 2 / MgO / La precursor, fired at 550°C for 1h to prepare SnO with a weight ratio of 7:2:5 and a nanocrystalline size of 1-20nm 2 / MgO / La chemical co-precipitation mixed oxide powder. The weight ratio of 88% Ag powder and 12% SnO 2 / MgO / La hybrid powders were high-energy ball milled in a nitrogen atmosphere. A stirring high-energy ball mill is used with a ball-to-material ratio of 40:1 and a rotational speed of 300 rpm. The ball milling time was 0.5 hours. The ball-milled powder is cold-pressed at 400MPa to form an embryo, sintered at 750°C, and then re-pressed and annealed to shape. Nanoscale SnO 2 AgSnO / MgO / La particles uniformly distributed in Ag matrix 2 / MgO / La contact alloy.

Embodiment 3

[0027] Embodiment 3, coprecipitation prepares Ag, SnO 2 , MgO / Ce precursor, fired at 450°C for 1h to obtain a weight ratio of 88% Ag, 10% SnO 2 , 0.1% MgO, 1.9% Ce oxides are nano-amorphous mixed powder, which are cold-pressed at 400MPa to form embryos, hot-pressed and sintered at 600°C and 200MPa, and then annealed under multiple pressure to prepare Ag / SnO 2 / MgO / Ce homogeneously blended nano-amorphous contact alloy.

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Abstract

The invention is relates to components of electric contact material and fabricating technique. Weight percentage of each component is a following: 70-95% Ag, 2.5-20% stannic oxide, 0.025-1% magnesia and 0.025-9% lanthanum or cerium. Compound powder of Ag, SnO2, MgO, La or Ce in Nano amorphous or crystalloid is prepared through high-octane ball milling. Structure, decentrality and dimensional stability of Nano granules are improved by adding lanthanide series into material. Thus, formability and electrical property of electric contact alloy are improved as well as ablation rate of contact is reduced and service life is increased.

Description

Technical field [0001] The invention belongs to silver-based electrical contact materials, in particular to the composition and preparation process of electrical contact materials. Background technique [0002] At present, the known silver-based electrical contact materials: 1. Prepare nano-SnO by high-energy ball milling 2 Silver-based electrical contact alloy (patent application number 00135475.2); 2. Nano SnO 2 / Fe 2 o 3 Blend-doped silver-based electrical contact alloy and its preparation method (patent application number 2003101222631); 3. Preparation of nano-SnO by sol-gel method 2 , ZnO, TiO 2 and rare earth components to prepare nano-silver-based electrical contact alloys (patent application number 02146696.3); 4. Use doped metal oxides (including SnO 2 , ZrO, ZnO, TiO, MnO, WO, etc.) silver-based electrical contact alloys (patent application number 03100430.X), and silver-based electrical contact materials that undergo boron or carbon, nitrogen,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/02H01H11/04
Inventor 王俊勃杨敏鸽陈立成张燕李英民丁秉钧王鹏飞
Owner XI'AN POLYTECHNIC UNIVERSITY
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