Preparation method of Ag / Ti3SiC2 electric contact composite material

Abstract

The invention relates to a preparation method of a novel electric contact composite material, and provides a preparation method of an Ag / Ti3SiC2 electric contact composite material. The preparation method comprises the following steps of: preparing silver coated Ti3SiC2 powder by a Tollen reagent chemical silvering method, then cleaning the powder with distilled water to neutral, washing with alcohol and drying in vacuum; carrying out ball milling on dried powder and silver powder and mixing uniformly; compacting the uniformly mixed powder into a green body through isostatic pressing, then carrying out sintering, repressing and re-sintering, and finally moulding through hot extrusion to obtain a finished product. According to the invention, wetabilities of a reinforcing phase and a silver matrix are improved through a silver loaded surface technology; severe clustering will not occur on a surface of the material eroded by arc; and contact resistance keeps at a low and stable range; meanwhile, material surface temperature rise can be maintained at a low level. A mixing amount of the reinforcing phase in the composite material can be increased substantially, and silver can be saved by 5-10%, compared with an Ag / SnO2 material.

Description

technical field [0001] The invention relates to a preparation method of a novel electrical contact composite material, specifically, a Ag / Ti 3 SiC 2 Preparation method of electrical contact composite material. Background technique [0002] Electrical contact materials and their components are the core foundation of the electronics and electrical industry. They are mainly responsible for the work of connecting, disconnecting, guiding and isolating current. Their performance directly affects the reliability, stability and accuracy of electronic and electrical products. and service life. At present, my country's annual consumption of silver-based electrical contact materials has exceeded 10 billion yuan, which are mainly used in communication equipment, low-voltage electrical appliances, household appliances and the automotive industry, and the market demand continues to grow rapidly. For example, the number of mobile phones in the world has reached 5 billion, and the number...

AI Technical Summary

Problems solved by technology

Toxic Ag / CdO materials are being phased out globally, and countries all over the world are looking for environmentally friendly and harmless new system electrical contact materials, the most representative of which is Ag / SnO 2 Material, Ag / SnO 2 It has good arc erosion resistance, welding resistance and wear resistance, but there are also two defects that cannot be ignored: one is SnO 2 Poor wettability with silver substrate, coupled with SnO 2 The resistivity (0.93Ω·m) and the resistivity of the electrical contact material (10 -8 Ω·m level) is too different, SnO 2 Density (6.38g / cm 3 ) than the density of the matrix Ag (10.53g / cm 3 ) is small, and the surface of the material is eroded by the arc during use to form a micro-melt pool, so that the SnO 2 Accumulate on the surface of the material to form slag that is not easy to conduct electricity, resulting in an increase in the contact resistance of the electrical contact material, an excessively high surface temperature rise, and deterioration of electrical properties

The second is SnO 2 High hardness, Ag / SnO 2 The processing and molding of materials is extremely difficult

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