Engine Tests

Engine testing of ceramic components showed significant improvements in wear reduction. The first test was the crossheads with ceramic pads. After 500 hours of overspeed/overload testing, the total wear of the 'crosshead with the ceramic pad' and 'rocker lever nose' combination was reduced by more than 50% compared to the standard 'crosshead - rocker lever nose' couple.

In a second series of engine tests each possible permutation of ceramic and metal balls and sockets was tested.

These components were tested at a 10%

overspeed and overload condition for

100 hours in used engine oil. The salient results are the following:

. there was severe abrasive wear on all standard ball-socket components;

. there was little or no abrasive wear on ceramic-to-metal ball-sockets ;

. total ball-socket joint wear with ceramic-to-metal interfaces was dramatically less than the wear 1n the standard all metal ball-socket joints;

. micro-asperities with ceramic-to-ceramic Interfaces can lead to "point'1 contact, then micro-spallation;

. carefully designed and produced ceramic-to-metal interfaces were shown to be the optimum combination.

0 0

Post a comment