Basic Features Of Zinc-Aluminum Alloy Bushings

Zinc-aluminum alloy bushings are cast alloy bushings mainly composed of zinc (Zn) and aluminum (Al), often with added elements such as copper (Cu) and magnesium (Mg). They are widely used in wear-resistant components such as sliding bearings and bushings.

Core Performance and Characteristics
High Strength and Hardness:
ZA27-2 (approximately 27% aluminum, 2% copper) has a tensile strength of 400–430 MPa and a Brinell hardness of 100–120 HBS, comparable to or even exceeding some aluminum bronzes.

Excellent Wear Resistance:
Low friction coefficient (ordinary type about 0.2–0.3, can be reduced to 0.06–0.12 with graphite inlays), significantly lower wear rate than tin bronze, with a service life 3–5 times longer.

Lightweight:
Density is about 5.0 g/cm³, 40%–45% lighter than tin bronze, which helps reduce overall equipment weight.

Good Casting and Machining Performance:
Low melting point (about 385℃), good fluidity, suitable for die casting of complex thin-walled parts.
Surface is easy to electroplate, spray, or anodize.

Self-lubricating Potential:
Can achieve maintenance-free operation through graphite inlays, suitable for harsh environments with oil shortages, dust, or underwater conditions.

Cost Advantages:
Raw material cost is about 30%–40% of copper alloys, and overall manufacturing cost can be reduced by more than 50%.