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Preparation method of Ti3SiC2 reinforced Ag-based electric contact material

A technology of electrical contact materials and reinforcement phases, applied in the field of metal matrix composite materials, can solve the problems of complex process, high cost, and large energy consumption, and achieve the effects of low cost, short production cycle, and energy saving

Inactive Publication Date: 2017-03-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the material has excellent performance, the process is complex and consumes a lot of energy and cost

Method used

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  • Preparation method of Ti3SiC2 reinforced Ag-based electric contact material
  • Preparation method of Ti3SiC2 reinforced Ag-based electric contact material

Examples

Experimental program
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Effect test

Embodiment 1

[0019] First, weigh Ti 3 SiC 2 powder 0.1g, Ag powder 9.9g as the preparation of Ag-Ti 3 SiC 2 The raw material of the electric contact material is dried by wet ball milling for 5 minutes to obtain a mixed powder, which is cold-pressed at 100 MPa to obtain a green body, and finally sintered in a sintering furnace under the protection of an Ar atmosphere. The sintering temperature is 700 ° C, and the heating rate is 5°C / min, sintering time 12h, to get Ag-1wt.%Ti 3 SiC 2 electrical contact material. The relative density reaches 90.3%, the hardness reaches HV55, and the resistivity is 1.87×10 -3 mΩ·cm.

Embodiment 2

[0021] First, weigh Ti 3 SiC 2 powder 0.5g, Ag powder 9.5g as the preparation of Ag-Ti 3 SiC 2 The raw material of the electric contact material is dried by wet ball milling for 90 minutes to obtain a mixed powder, which is cold-pressed at 600MPa to form a green body, and finally sintered in a sintering furnace under the protection of an Ar atmosphere. The sintering temperature is 800°C and the heating rate is 5°C / min, sintering time 6h, to get Ag-5wt.%Ti 3 SiC 2 electrical contact material. The relative density reaches 95.77%, the hardness reaches HV53, and the resistivity is 2.35×10 -3 mΩ·cm.

Embodiment 3

[0023] First, weigh Ti 3 SiC 2 powder 2.0g, Ag powder 8.0g as the preparation of Ag-Ti 3 SiC 2 The raw material of the electric contact material is dried by wet ball milling for 60 minutes to obtain a mixed powder, which is cold-pressed at 550MPa to obtain a green body, and finally sintered in a sintering furnace under the protection of an Ar atmosphere. The sintering temperature is 900°C and the heating rate is 10℃ / min, sintering time 4h, get Ag-20wt.%Ti 3 SiC 2 electrical contact material. The relative density reaches 93.5%, the hardness reaches HV71, and the resistivity is 5.98×10 -3 mΩ·cm.

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Abstract

The invention discloses a preparation method of a Ti3SiC2 reinforced Ag-based electric contact material. The preparation method is characterized in that the composite material consists of a Ti3SiC2 reinforced phase and an Ag matrix, wherein the mass percentage of Ti3SiC2 is 1-40%. The preparation method comprises the following specific preparation steps: weighing Ti3SiC2 powder and Ag powder in proportion; then ball-milling and mixing for 5-120 minutes by a wet process; after drying the powder, molding the powder under the pressure of 100-800 MPa in a cold pressing manner to obtain a green body; and then sintering the green body for 1-12 hours at the temperature of 700-1,100 DEG C in an inert atmosphere or a vacuum environment, and cooling in a furnace to obtain the Ti3SiC2 reinforced Ag-based electric contact composite material. The Ag-based composite material prepared by the preparation method is uniform in structure, high in compactness and excellent in conductivity. Moreover, the method is simple in process, low in cost and environmentally friendly, and has great significance on preparation of high-performance electric contact materials.

Description

technical field [0001] The present invention relates to a metal matrix composite material, namely Ti 3 SiC 2 A method for preparing a reinforced Ag-based electrical contact material. Background technique [0002] Electric contacts are contact elements of electrical switches, instruments and meters, etc., and are mainly responsible for connecting and breaking circuits and load currents. In the modern electrical and electronic industries, the requirements for the stability, reliability, lifespan, and ecological environmental protection of electrical contact materials are gradually increasing. The traditional Ag-CdO material has excellent properties such as wear resistance, welding resistance, and arc erosion resistance, but the Cd vapor generated during use will cause harm to the ecological environment and the human body (Dev S C, et al.J Mater Sci, 1993, 28(24):6540-6544.). Ag-SnO 2 The material has excellent arc erosion resistance, wear resistance, welding resistance an...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C5/06
CPCC22C1/05C22C5/06
Inventor 孙正明张敏田无边张培根丁健翔张亚梅
Owner SOUTHEAST UNIV
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