Aluminum Bronze UNS C95200 is a copper-aluminum-iron casting alloy with a nominal composition of 87.5% Cu, 9% Al, and 3.5% Fe, conforming to CDA number 95200. The aluminum content produces a hard wear-resistant surface with good strength and corrosion resistance, while the iron addition refines grain structure and improves both strength and hardness. The alloy develops a protective aluminum oxide surface film providing excellent resistance to corrosion in seawater, acids, and industrial atmospheres. C95200 aluminum bronze bearings are specified for heavy-load bearing applications where the combination of high compressive strength, good wear resistance, and corrosion resistance is required. Typical applications include sleeve bearings, thrust washers, bushings, worm gears, and structural components in marine equipment, hydraulic machinery, and mining equipment. Supplied in 2-20 lb ingots for foundry production of bearing and structural castings.
Common technical inquiries regarding Aluminum Bronze UNS C95200
C95200 offers significantly higher compressive strength and hardness than standard tin bronzes — compressive strength typically exceeds 100,000 psi compared to 60,000-80,000 psi for C90300 Navy G bronze. This makes aluminum bronze the correct specification for bearing applications involving shock loads, high unit pressures, or slow oscillating motion where tin bronzes would deform plastically. Aluminum bronze also outperforms tin bronze in abrasive environments where hardness directly determines wear life.
C95200 is not a self-lubricating bearing material — it requires a continuous lubricant film for reliable service. Unlike leaded bronzes where lead provides emergency dry-running capability, aluminum bronze has no internal lubricant phase. Proper lubrication system design with adequate oil supply, correct viscosity, and clean filtration is essential. In intermittently lubricated applications, aluminum bronze bearings are more prone to galling than leaded alternatives.
Aluminum bronze is prone to aluminum oxide inclusion formation during melting and pouring. Melting must be done quickly under a flux cover with minimal stirring to reduce oxide generation. Pouring should be smooth and non-turbulent using bottom-gated systems that fill the mold cavity from below to prevent oxide entrainment. Degassing with nitrogen before pouring reduces hydrogen porosity. The alloy has significant solidification shrinkage requiring adequate risering for sound pressure-tight castings.
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