Babbitting is a metal alloy coating that goes on a base metal to protect it from wear. Typically, the Babbitting process is used on investment castings, which are made of cast iron. The challenge is that investment casting is costly to produce. The Babbitting process helps to protect the bearing surface of the casting giving it an extended life span. In addition, the cost to replace or repair the casting wear surface is significantly less.
Named after Isaac Babbitt, the patented Babbitting process has been used throughout North America for more than 150 years. Compared to white metals, Babbitt metals are more widely known. These metals primarily consist of tin alloys that are hardened with antimony, copper, and lead alloys that are hardened with antimony and tin. In some instances, lead alloys also contain arsenic.
As part of the Babbitting process, the relatively soft bearing material bonds to a much stronger base metal, giving it support. The exact form can be a half-round mild steel bushing or pressing, an iron or bronze casting, or a mild strip of steel unwound from a coil.
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