Preparation method for W-Cu composite materials of fiber and particle hybrid structure

Abstract

The invention provides a preparation method for W-Cu composite materials of a fiber and particle hyrid structure. Particularly, W powder and Cu powder hyrid evenly and a W fiber net obtained after acid pickling are laid in a cold pressing mold in a layered mode and then subjected to pre-pressing and pressure maintenance to obtain a composite material green body; then the green body is put in to a mold capable of being pressurized and subjected to hot pressing in an atmosphere protection hot pressing furnace; and finally, the composite material green body obtained after hot pressing is subjected to copper cementation in a high-temperature atmosphere sintering furnace, so that the W-Cu composite materials of the fiber and particle hyrid structure are obtained. The two-dimensional W fiber net is added in the preparation process of a W-Cu pseudo alloy W framework. The two-dimensional W fiber net and the W-Cu pseudo alloy W framework form metallurgical bonding through processing of an interface of fibers and the W framework and reasonable technological parameters, the W fiber net has a function like reinforcing ribs for the W framework, and therefore the high-temperature strength of the composite materials is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to a preparation method of copper-tungsten composite material with fiber and particle hybrid structure. Background technique [0002] In order to meet the requirements of the continuous development of the power market, my country's high-voltage switchgear is developing in the direction of high voltage, large capacity and miniaturization. The capacity of new circuit breakers will continue to increase, while the space of the arc extinguishing chamber will continue to shrink, so that the load borne by the unit area of ​​the arcing contacts will continue to increase; at the same time, in order to reduce maintenance costs, the life of the contacts is required However, it is getting longer and longer, so it is hoped that the contact material not only has excellent arc ablation resistance, but also has excellent high temperature strength. There is very limited space f...

AI Technical Summary

Problems solved by technology

There is limited space for synergistically improving the high-temperature strength and arc ablation resistance of contact materials in traditional processes, such as strengthening the sintering of the tungsten skeleton, adding a third component, etc. Although it can improve the arc ablation resistance of contact materials, However, after multi-frequency breaking, since the powder is randomly sintered, it is difficult to achieve a complete continuous skeleton structure, resulting in insufficient strength of the tungsten skeleton after ablation, which aggravates ablation and wear

Images