Working Principle of Zinc-Aluminum Alloy Bushings

High Hardness and Wear-Resistant Matrix: Zinc-aluminum alloy contains about 27% aluminum. After solidification, a large number of aluminum-zinc intermetallic compound reinforcement phases are formed, significantly improving hardness and tensile strength (up to 400–430 MPa), providing a stable microscopic support structure during friction, and reducing wear.

Self-Lubricating Mechanism:
In graphite-embedded bushings, high-purity graphite is embedded into surface pores of the matrix (covering 20%–30% of the friction area). During friction, graphite transfers to the mating shaft surface under thermal and mechanical action, forming a continuous lubricating film, reducing the friction coefficient to 0.06–0.12, achieving oil-free lubrication.

In porous oil-containing polymer structures, oil-impregnated polymer materials are embedded inside the bushing, continuously releasing lubricant through a "micro-oil supply" system, reducing direct metal-to-metal contact.

Structurally Assisted Lubrication: Some designs feature oil holes and silicone sealing systems, allowing external oil to supplement lubrication, and utilizing the elasticity of silicone to automatically seal holes, preventing oil leakage and extending maintenance intervals.

Lightweight and Cost Advantages: The density of zinc-aluminum alloy is about 5.0 g/cm³, 40%–45% lighter than copper alloys, and the raw material cost is only 30%–40% of copper-based materials, making it suitable for applications sensitive to weight and cost.