METHOD OF MANUFACTURE OF COPPER-BASED COMPOSITE MATERIAL AND COMPOSITE MATERIAL MANUFACTURED BY THIS METHOD Russian patent published in 2003 - IPC

FIELD: powder metallurgy; development of technologies of manufacture of heat-resistant and wear-resistant electrical copper-based composite materials by mechanical alloying; manufacture of power break and arcing contacts. SUBSTANCE: proposed method includes preparation of powder mixture containing particles of copper in form of chips ground preliminarily and at least one agent selected from group containing chromium, tungsten, NbCr₂ and silicon carbide in the amount not exceeding 50 mass-% at initial dispersivity of 10-40 mkm, grinding this mixture in high-power mill for 30-180 min followed by cold briquetting, heating to temperature not higher than temperature of beginning of recrystallization solid copper solution and molding at this temperature. Copper-based composite material manufactured in accordance with the proposed method includes additionally at least one agent selected from group containing chromium, tungsten, NbCr₂ and silicon carbide in the amount not exceeding 50 mass-% characterized by long-term hardness at 400 C exceeding hardness of internally oxidized copper by at least 1.5 times. EFFECT: enhanced thermal stability of material; increased hardness at high level of electrical conductivity. 7 cl, 4 dwg, 2 tbl, 2 ex