A bearing liner is a crucial component designed to reduce friction and wear between moving parts, typically a shaft and a housing.

Bearing Liner Material Selection

The selection of a suitable material for bearing liners depends heavily on the operating conditions, such as load, speed, and temperature. Key properties include low friction, good wear resistance, and the ability to conform to the shaft surface.

Why Babbitt Metal is Used for Bearing Liners

Babbitt metal, also known as white metal, is commonly used for bearing liners due to its excellent anti-friction properties and conformability. Its composition, typically tin, lead, antimony, and copper, creates a soft surface that readily shapes itself to the shaft, accommodating minor misalignments and embedding small abrasive particles. This prevents scoring and damage to the harder shaft. Babbitt is usually applied as a thin layer over a stronger backing material (like steel or bronze) to provide structural support.

While other alloys like brass, bronze, and gun metal have bearing applications, Babbitt metal is particularly favored for applications requiring excellent seizure resistance and the ability to run-in smoothly, such as in automotive engines, turbines, and heavy machinery.