High-performance environmentally-friendly copper-bismuth dual-metal bearing material and manufacturing method thereof

Abstract

The invention discloses a high-performance environmentally-friendly copper-bismuth dual-metal bearing material and a manufacturing method thereof and aims to provide a high-performance environmentally-friendly copper-bismuth dual-metal bearing material without containing lead which is harmful to a human body and a manufacturing method thereof. The high-performance environmentally-friendly copper-bismuth dual-metal bearing material is prepared by sintering a steel plate and a copper-based alloy wear-resisting layer and is characterized in that the copper-based alloy wear-resisting layer comprises the following components in percentage by weight: 1%-3% of bismuth, 5%-11% of tin and the balance of copper. The manufacturing method comprises the steps of: shearing and blanking of the steel plate, inspecting, powder spreading, primary sintering, rolling, secondary sintering, rerolling, and finally obtaining the finished plate product of the high-performance environmentally-friendly copper-bismuth dual-metal bearing material. As the bismuth is used for replacing lead in the copper-based alloy, the high-performance environmentally-friendly copper-bismuth dual-metal bearing material does not contain lead, is non-hazardous to the human body, does not pollute the environment and is an environmentally-friendly copper-based-steel dual-metal bearing material. Simultaneously, when the content of bismuth is 1.0-3.0wt%, the best frictional wear resistance of the high-performance environmentally-friendly copper-based-steel dual-metal bearing material is achieved; in addition, as the density of bismuth is less than that of lead, the manufactured bearing material is lighter than that containing lead.

Description

technical field [0001] The invention relates to materials for oil-free lubricating bearings, in particular to a high-performance environmental-friendly copper-bismuth bimetallic bearing material and a manufacturing method thereof. Background technique [0002] Traditional copper-lead alloy bearing materials are widely used as high-power, high-speed and heavy-load sliding bearing materials due to their large load-carrying capacity, high fatigue strength and good thermal conductivity. During the working process, the low-melting point component lead will ooze and transfer to the surface under the action of local contact friction heat, reducing the shear strength of the contact point, improving the anti-adhesion and anti-seizing ability of the material, and reducing frictional resistance and friction. temperature rise. However, in recent years, as human beings pay more attention to health and environmental protection requirements and the introduction of international automobile...

AI Technical Summary

Problems solved by technology

Bismuth, a non-toxic low-melting metal element, is similar to lead, insoluble in copper and aluminum alloys, and basically exists in a free state, which has little effect on the strength of the alloy matrix. During the friction process, bismuth melts due to friction heat and forms an anti-adhesive bond on the friction surface. , Anti-friction film, thereby improving the friction and wear characteristics of composite materials, has been first applied in aluminum-based composite materials; similarly, introducing the metal element bismuth into copper-based bearing materials can also play a role in reducing friction and anti-adhesion. There are application research reports of lead-free copper-bismuth composite materials, such as patent 200810072436.6 environmental protection copper-based steel bimetallic bearing material and its manufacturing method, 200910044854.9 bismuth bronze-steel composite bimetallic bearing material and its manufacturing method, etc., which are generally used in copper-based alloys. The content of bismuth in the medium accounts for 1%-15% of the total weight, and some even reach 30%. At present, the research on the tribological characteristics and mechanism of lead-free copper-bismuth bearing materials is still relatively lacking.

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