Method for Selecting Crack-Resistant Ceramic Substrates
Original Publication Date: 1988-Jun-01
Included in the Prior Art Database: 2005-Feb-15
A statistical technique is employed to determined substrates which exhibit cracks by subjecting them to a succession of controlled collision impacts. In one such technique, the test procedure for impact resistance determination of ceramic substrates is as follows: In the first cycle of the process, the substrates are grouped in 25 to 50 pairs. Each substrate of one pair is first set to free slide along a track and collide with the other substrate of the pair that is positioned at the bottom of the track and is stationary. The track is preset at a predetermined angle from horizontal, such as 70 or 90 degrees. In the first cycle, the initial distance between the two substrates is fixed, such as 10 inches. The collision is repeated for a total number of 25 or 50 times by testing the 25 to 50 pairs of raw substrates as received.