Which of the following is not a material used for friction bearing liners?

Friction bearing liners are materials designed to reduce friction between moving parts in machinery while supporting loads. The materials selected for these liners usually have specific properties such as wear resistance, strength, and low friction coefficients.

Bronze and aluminum are commonly used for friction bearing liners. Bronze is renowned for its excellent wear resistance and good load-bearing properties, while aluminum is favored for its lightweight and corrosion-resistant qualities. Steel can also be employed in certain applications, particularly where high strength is needed.

Carbide, on the other hand, is not typically used as a liner material in friction bearings. Carbide is a hard and brittle material that works well in cutting applications or as a wear-resistant component but does not possess the necessary properties for bearing liners. Bearing liners require materials that can deform slightly to accommodate misalignment and have enough lubrication retention, whereas carbide does not provide these characteristics.

Therefore, the correct answer relates to the uncommon use of carbide in friction bearing liners, distinguishing it from the more traditional materials listed in the other options.