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Technical Paper

Development of an Inexpensive, Highly Wear-Resistant Ceramic Cam Follower - Part 2 Brazing Technology

1993-11-01
931934
Ceramic materials such as silicon nitride and sialon are known for their excellent wear-resistance and scuffing-resistance even under high contact pressure and poor lubrication1. However, ceramic materials, which have excellent sliding properties, are not widely adopted for valve train components, at present. A main reason for this is their high cost. A ceramic cam follower, newly developed by utilizing the direct brazing technology, has the following features and can be produced at the lowest cost: (1) Parts are only three. -A thin ceramic disc, a steel body, and an active brazing foil. (2) No grinding is necessary after brazing. -A crowning at the cam sliding surface is formed by the difference of the thermal expansion coefficients between silicon nitride and steel. (3) No hardening is necessary after brazing. -The steel body is hardened by the heat treatment of brazing.
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