Copper-nickel-tin alloy bar and manufacturing method thereof

Abstract

The invention discloses a copper-nickel-tin alloy bar. The copper-nickel-tin alloy bar comprises, by mass, 14%-16% of nickel, 7%-9% of tin, 0.05%-0.3% of yttrium, 0.8%-1.0% of aluminum, 0.2%-1.0% of niobium, and the balance copper and other impurities. The invention further discloses a manufacturing method of the copper-nickel-tin alloy bar. The method comprises the steps that alloy powder is prepared according to the ingredients and the mass percentages through a gas atomization method, then an alloy ingot blank is prepared through the methods of cold isostatic pressing molding, vacuum sintering and ingot blank covering, and finally the high-quality copper-nickel-tin alloy bar is obtained through the processes of water-sealing hot extrusion, cold rotary swaging, aging treatment and the like. By means of the method, the problems of composition segregation and the like generated in the casting process of a copper-nickel-tin alloy can be avoided, and the yield is high; the copper-nickel-tin alloy bar can have high strength, high toughness and excellent abrasion and corrosion resistance at the same time, and the overall performance is higher than that of beryllium bronze. The copper-nickel-tin alloy bar can be widely applied to manufacturing of bearings, shaft sleeves, bearing bushes and other wear-resisting components which are used in high-load, high-speed and high-corrosion environments like space flight and aviation and oil drilling platforms.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a copper-nickel-tin alloy rod and a preparation method thereof. Background technique [0002] Copper-nickel-tin alloy (such as Cu-15Ni-8Sn and Cu-9Ni-6Sn) is a high-end copper alloy material with high strength and excellent wear resistance and corrosion resistance, especially the strength of Cu-15Ni-8Sn alloy The maximum can reach more than 1100MPa, which is equivalent to high-strength steel and beryllium copper. The corrosion resistance in seawater or acidic, oil and gas environments, and the wear resistance under high load conditions are better than beryllium copper and aluminum bronze. [0003] The Cu-Ni-Sn alloy belongs to the aging amplitude modulation decomposition (Spinodal) strengthened copper alloy. Through solid solution treatment, Ni and Sn are solid-dissolved into the α phase of Cu to obtain an unstable supersaturated solid solution. After aging treatmen...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology, solve or avoid the serious problem of Sn segregation in the production of ingots by smelting and casting methods and the obvious lack of mechanical properties caused by discontinuous precipitation in the alloy aging process problem, provide a copper-nickel-tin alloy bar and its preparation method