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...

Examples

Embodiment approach 1

[0022] According to Ag / 1wt.% (mass percentage) Ti 2 Composite electrical contact material prepared by SnC: Ti 2 SnC particles and Ag powder are mixed according to the above mass ratio, ball milled for 5min, the mixed powder is cold-pressed at 100MPa, and finally sintered in an ordinary tubular atmosphere furnace under Ar atmosphere or vacuum protection, the sintering temperature is 600°C, and the sintering time is 1h , to get Ag / 1wt.%Ti 2 SnC electrical contact material. The relative density is up to 93.5%, the hardness is up to HV30, and the resistivity is 5.4×10 -2 μΩ·m.

Embodiment approach 2

[0024] According to Ag / 7wt.% (mass percentage) Ti 2 Composite electrical contact material prepared by SnC: Ti 2 SnC particles and Ag powder are mixed according to the above mass ratio, ball milled for 20min, the mixed powder is cold-pressed at 150MPa, and finally sintered in an ordinary tubular atmosphere furnace under Ar atmosphere or vacuum protection, the sintering temperature is 650°C, and the sintering time is 2h , to get Ag / 7wt.%Ti 2 SnC electrical contact material. The relative density reaches 94.0%, the hardness reaches HV42, and the resistivity reaches 9.5×10 -2 μΩ·m.

Embodiment approach 3

[0026] According to Ag / 10wt.% (mass percentage) Ti 2 Composite electrical contact material prepared by SnC: Ti 2 SnC particles and Ag powder are mixed according to the above mass ratio, ball milled for 40min, the mixed powder is cold-pressed at 200MPa, and finally sintered in an ordinary tubular atmosphere furnace under Ar atmosphere or vacuum protection, the sintering temperature is 690°C, and the sintering time is 4h , to get Ag / 10wt.%Ti 2 SnC electrical contact material. The relative density reaches 93.8%, the hardness reaches HV51, and the resistivity is 13.4×10 -2 μΩ.m.

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...

Examples

Embodiment approach 1

[0022] According to Ag / 1wt.% (mass percentage) Ti 2 Composite electrical contact material prepared by SnC: Ti 2 SnC particles and Ag powder are mixed according to the above mass ratio, ball milled for 5min, the mixed powder is cold-pressed at 100MPa, and finally sintered in an ordinary tubular atmosphere furnace under Ar atmosphere or vacuum protection, the sintering temperature is 600°C, and the sintering time is 1h , to get Ag / 1wt.%Ti 2 SnC electrical contact material. The relative density is up to 93.5%, the hardness is up to HV30, and the resistivity is 5.4×10 -2 μΩ·m.

Embodiment approach 2

[0024] According to Ag / 7wt.% (mass percentage) Ti 2 Composite electrical contact material prepared by SnC: Ti 2 SnC particles and Ag powder are mixed according to the above mass ratio, ball milled for 20min, the mixed powder is cold-pressed at 150MPa, and finally sintered in an ordinary tubular atmosphere furnace under Ar atmosphere or vacuum protection, the sintering temperature is 650°C, and the sintering time is 2h , to get Ag / 7wt.%Ti 2 SnC electrical contact material. The relative density reaches 94.0%, the hardness reaches HV42, and the resistivity reaches 9.5×10 -2 μΩ·m.

Embodiment approach 3

[0026] According to Ag / 10wt.% (mass percentage) Ti 2 Composite electrical contact material prepared by SnC: Ti 2 SnC particles and Ag powder are mixed according to the above mass ratio, ball milled for 40min, the mixed powder is cold-pressed at 200MPa, and finally sintered in an ordinary tubular atmosphere furnace under Ar atmosphere or vacuum protection, the sintering temperature is 690°C, and the sintering time is 4h , to get Ag / 10wt.%Ti 2 SnC electrical contact material. The relative density reaches 93.8%, the hardness reaches HV51, and the resistivity is 13.4×10 -2 μΩ.m.