Powder composition for copper alloy material, composite material layer, electric contact and preparation method of electric contact

• Main Authors: TIAN BAOHONG, LI WUHUI, LI QUANAN, ZHANG YI, LONG YONGQIANG, ZHU HONGXI, REN FENGZHANG, LIU YONG, SONG KEXING
• Format: Patent
• Language: English
• Published: 02.12.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SWITCHES; ELECTRICITY; EMERGENCY PROTECTIVE DEVICES; RELAYS; SELECTORS

The invention discloses a powder composition for a copper alloy material, a composite material layer, an electric contact and a preparation method of the electric contact, and belongs to the technical field of electric contact materials in the electric power industry. Main components of the copper alloy composite material are W and Cu, a WCu alloy can be formed, added CeO2 and WC particles are dispersively distributed in a WCu alloy matrix, the electron work function is lower than that of W, thereby not only playing a role of dispersion strengthening, but also being capable of enabling electric arcs to be effectively dispersed, and thus improving the arc ablation resistance, the arc stability, the welding resistance, the strength and the like of a contact material. According to the invention, a Cu-W-WC-CeO2 mixture layer is preset at the surface of a Cu-Cr alloy, high frequency induction heating and welding are carried out in an inert atmosphere, then a W-Cu alloy integrated contact material is acquired through solid solution treatment and aging treatment. The interface bonding strength of the composite material layer and the matrix is 260-380MPa, thereby being capable of meeting requirements of a self-elastic integrated contact for a high-voltage switch and a circuit breaker.