COPPER BASED COMPOSITION MATERIAL AND METHOD OF ITS PRODUCTION Russian patent published in 1997 - IPC

FIELD: production of copper based composition material. SUBSTANCE: proposed copper based composition material has shell made of copper and core, that is fully embraced by shell composed of copper die with uniformly distributed in it particles of metal oxide. In the case as oxides the material has at least one oxide of metal taken from group, that has aluminum oxide, titanium oxide and hafnium oxide with following ratio of components, mass %: at least one oxide of metal taken from group, that has aluminum oxide, titanium oxide and hafnium oxide 0.12 - 1.45; copper - balance. In the case average size of oxides does not exceeds 50 nm and area of shell is no less than 10 % of material cross-section area Preferable share of aluminum oxide is 0.15 - 1.4 mass % and most preferable share is 0.19 - 1.2 mass %. Preferable share of titanium oxide and / or hafnium oxide is 0.06 - 0.85 mass % and most preferable share is 0.1 - 0.8 mass %. Aluminum, titanium and hafnium oxides, as a version, are present in material simultaneously and their preferable share is 0.123 - 1.4 mass % and most preferable share is 0.85 - 1.08 mass %. In the case ratio of Al₂O₃:HfO₂:TiO₂ is (4 - 10) : 1 : ! and average size of oxides does not exceed 10 nm. Proposed method of composition material production provides for heating of copper based alloy with at least one metal taken from group of aluminum, titanium, hafnium in amount, that does not exceed 0.8 mass %; alloy dispersion with production of powder particles with average size up to 150 mcm and maximum size of 315 mcm; inner oxidation of powder under temperature of 700 - 950 C in the air for time period defined from formula τ = KR²Σ(γ_iC_i)/6P, with K - factor depending on powder form and equal to 1 - 3; R - powder particle size, cm; γ_i - stoichiometric ratio in oxide formula of i - number alloying member; C_i - atomic share of i-number alloying member; P - penetrability of oxygen in copper umber oxidation temperature, atomic share of cm²c^-1. Then reduction annealing and powder extrusion are exercised in shell under temperature of 700 - 950 C with extrusion degree of no less than 10 till production of composition material. EFFECT: improved process. 18 cl, 15 dwg