Preparation method of silver-tin oxide-wolfram carbide composite electric contact material and product thereof

• Main Authors: MIAO RENLIANG, BAI XIAOPING, WAN DAI, LIN WANHUAN, ZHOU KEWU, YAO PEIJIAN
• Format: Patent
• Language: Chinese; English
• Published: 22.12.2017
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CASTING; CHEMISTRY; ELECTRIC SWITCHES; ELECTRICITY; EMERGENCY PROTECTIVE DEVICES; FERROUS OR NON-FERROUS ALLOYS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; RELAYS; SELECTORS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

The invention discloses a preparation method of silver-tin oxide-wolfram carbide composite electric contact material and a product thereof. The technical scheme is characterized in that a basis material of a contact comprises, by weight, 1-20% of tin oxide, 0.01-10% of wolfram carbide, less than 5% of additives and the balance silver. The preparation method of the silver-tin oxide-wolfram carbide composite electric contact material and the product thereof has the advantages and the positive effects as follows: 1, a chemical reduction coating method is adopted, so that the uniformity of mixed powder is better and the sintering strength is higher; 2, the surfaces of the WC powder body and the SnO2 powder body are uniformly coated with a silver layer, so that the electric arc erosion resistance and the melt welding resistance of the electric contact material are improved, and the reliability of a contactor is improved; and 3, the Ag-SnO2-WC contact material with appropriate components is selected, so that the ar