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Preparation method of novel Ag-based lanthanum stannate composite electric contact material

An electrical contact material and stannic acid-based technology, which is applied in the field of preparation of a new Ag-based lanthanum stannate composite electrical contact material, can solve the problems of shortening the service life of the contact material, low elongation, high welding force and the like, and achieves synthesis The effect of simple process, excellent mechanical properties and best tensile strength

Active Publication Date: 2015-09-09
ZHEJIANG UNIV
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Problems solved by technology

[0004] However, the shortcomings of the existing technology are: Ag / SnO 2 Due to the excessive hardness and low elongation of the contact material in the hot extrusion wire process, serious defects such as fracture and peeling occur in the wire processing process. In addition, high contact resistance and high welding force appear in the actual service process. Reduced Ag / SnO 2 Service life of contact material

Method used

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  • Preparation method of novel Ag-based lanthanum stannate composite electric contact material

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Embodiment Construction

[0020] The implementation of the present invention will be described below through specific embodiments.

[0021] 1. Preparation of lanthanum stannate nanopowder

[0022] (1) Preparation of precursor solution A

[0023] Add oxalic acid dihydrate to deionized water, stir it with magnetic force until it is completely dissolved, then pipette it into a volumetric flask to constant volume, and prepare a colorless and transparent solution with a concentration of 0.03-0.6mol / L, namely the precursor solution A;

[0024] (2) Preparation of precursor solution B

[0025] Add lanthanum nitrate and tin tetrachloride pentahydrate at a molar ratio of 1:1 to deionized water, stir with a magnetic force until completely dissolved, then transfer to a volumetric flask to constant volume, and prepare a total concentration of 0.2 to 1.5 mol / A colorless and transparent solution of L (the total concentration of the two solutes), i.e. precursor solution B;

[0026] (3) Preparation of lanthanum sta...

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Abstract

The invention relates to preparation of an electric contact material and provides a preparation method of a novel Ag-based lanthanum stannate composite electric contact material. The preparation method comprises carrying out ball-mill mixing on Ag powder and lanthanum stannate nanometer powder to obtain AgLa2Sn2O7 composite powder, carrying out hot pressing sintering treatment to obtain an AgLa2Sn2O7 blank block, and carrying out hot extrusion treatment to obtain an AgLa2Sn2O7 wire rod. The preparation method utilizes a simple AgLa2Sn2O7 composite powder synthesis technology, utilizes a ball milling technology to realize synthesis and has a low cost. Compared with AgSnO2, the AgLa2Sn2O7 wire rod has lower specific resistance, higher elongation percentage after annealing fracture, good tensile strength, excellent mechanical properties and better welding resistance.

Description

technical field [0001] The invention relates to the preparation technology of electrical contact materials, especially the preparation and industrial application of a novel Ag-based lanthanum stannate composite electrical contact material, which is applied to low-voltage electrical appliances such as AC contactors, relays, air switches and other equipment . Background technique [0002] As the core foundation of the electrical industry, electrical contact materials and components are responsible for the task of connecting and breaking currents, and their performance is directly related to the switching capacity, service life and operational reliability of the complete equipment. AgCdO electrical contact material has been widely used due to its low contact resistance, anti-welding resistance, arc erosion resistance and other excellent properties, and enjoys the reputation of "universal contact". However, AgCdO contact materials will release toxic Cd vapor during use, and the...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C5/06C22C32/00
Inventor 张玲洁杨辉沈涛樊先平申乾宏陈乐生张继
Owner ZHEJIANG UNIV
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