Measuring and testing – By abrasion – milling – rubbing – or scuffing
Patent
1992-12-09
1994-04-19
Noland, Tom
Measuring and testing
By abrasion, milling, rubbing, or scuffing
8352227, 356402, 356448, 428543, 4289088, G01N 356
Patent
active
053035747
ABSTRACT:
An article (40), such as a piece of manufacturing tooling, is modified prior to use by treating a portion of its surface (38) to be worn so that the treated surface worn more than a preselected amount has a different appearance than the treated surface worn less than the preselected amount, using a treatment process in which the treated surface is at least as wear resistant as the untreated surface. In one approach, the surface (38) is treated by implanting ions to a preselected depth. The ions are chosen so that the substrate has a different color at depths less than the preselected depth than does the substrate at depths greater than the preselected depth. After wear, the treated surface is visually inspected for color variations that indicate wear to more than the preselected depth. The surface treatment can also be accomplished by ion implanting or ion beam mixing a previously deposited surface coating.
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Bartelt John L.
Matossian Jesse N.
Mikkola Paul H.
Denson-Low Wanda K.
Duraiswamy Vijayalakshmi D.
General Motors Corp.
Hughes Aircraft Company
Noland Tom
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