Preparation method for Ti2SnC reinforced Ag-based electrical contact materials

Abstract

The invention relates to a preparation method for Ti2SnC reinforced Ag-based electrical contact materials. The composite materials are composed of Ti2SnC and an Ag base body, wherein the mass percentage of the Ti2SnC reinforcement phase is 1-50%. The Ti2SnC powder and Ag powder are mixed for 5-240 min at a ratio, and then subjected to cold press molding under the pressure of 100-800 MPa. A green body is sintered for 1-12 h at 600-1000 DEG C in a protection atmosphere or vacuum, and then the Ti2SnC reinforced Ag-based composite electrical contact materials are obtained. The Ag/Ti2SnC composite electrical contact materials prepared through the method have the advantages of being high in density, uniform in structure, moderate in hardness, good in electrical conductivity and the like.

Description

technical field [0001] The invention relates to a metal matrix composite material, specifically a Ti 2 SnC reinforced Ag-based electrical contact material and preparation method thereof. Background technique [0002] In the electrical and electronic industries, electrical contacts with the function of turning on, breaking off and carrying current are important contact elements to ensure the safety of circuits and the normal operation of electrical appliances. The performance and life of electrical contacts are directly related to the entire electrical equipment operational reliability. There are many kinds of electrical contacts, among which Ag-based electrical contact materials are widely used in low-voltage electrical appliances, household appliances, automotive electrical appliances, aerospace and other fields (Wang Yonggen et al. Low-voltage electrical appliances. 2011, 10, 58-61). Foreign research on the design and application of electrical contact materials started e...

AI Technical Summary

Problems solved by technology

However, the high temperature resistance of C is poor, and the burning loss is serious under the action of the arc, which leads to the decrease of the arc ablation resistance of the contact. Although increasing the C content can improve the arc ablation resistance, it weakens the strength and conductivity of the material. Therefore, the content of C in the Ag matrix is ​​generally low (3-5wt.%) (Liu Weili et al. Proceedings of the Tenth China-Japan Composite Materials Academic Conference. 2012, Chengdu, Sichuan, China, China Society of Composite Materials), and the silver-saving effect is poor ,higher cost

At present, because these non-toxic silver-based composite electrical contact materials have their own advantages, they have partially replaced Ag / CdO in some fields, but they still have some insurmountable shortcomings, so no contact can Completely replacing the status of Ag / CdO universal contacts cannot further meet the development needs of future electrical contacts, so the research and development of new environmentally friendly electrical contact materials has a long way to go