Method and apparatus for evaluation of coated parts
AssigneeHamilton Sundstrand Corporation
InventorsAaron T. Nardi, Blair A. Smith
Life of this patent
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Abstract
A method of verifying performance of a coated part includes calculating a deflection value as a function of a predetermined strain threshold value and a total thickness of a test coupon that comprises a coating on a substrate. The coating of the test coupon is co-deposited in a deposition process for producing a coated part. The test coupon is bent in an amount equal to the calculated deflection value and then evaluated as an indication of whether a mechanical characteristic of the coated part meets a specified level.
Claims16
A method of verifying performance of a coated part, comprising:
- calculating a deflection value (δ) as a function of a predetermined strain threshold value (ε) and a total thickness (t) of a test coupon comprising a coating on a substrate, wherein the coating of the test coupon was co-deposited in a deposition process for producing a coated part;
- deflecting the test coupon in amount equal to the deflection value (δ);
- and
- evaluating the coating of the test coupon after the deflecting as an indication of whether a mechanical characteristic of the coated part meets a specified level.
A method of verifying performance of a coated part, comprising:
- co-depositing a coating to produce a test coupon comprising the coating on a substrate and a coated part;
- calculating a deflection value (δ) as a function of a predetermined strain threshold value (ε) and a total thickness (t) of the test coupon;
- deflecting the test coupon in amount equal to the deflection value (δ);
- and
- evaluating whether coating of the test coupon has cracked after the deflecting as an indication of whether a fatigue performance of the coated part meets a specified level.
A bending test fixture for test coupons, comprising:
- a test region for receiving a test coupon;
- first and second supports on opposed sides of the test region, wherein one of the first or second supports includes a first pair of spaced-apart support points and the other of the first or second supports includes a second pair of spaced-apart support points that are narrowly spaced relative to the first pair of spaced-apart support points;
- a load shaft for applying a load to the second support;
- and
- an articulated joint between the load shaft and the second support for uniformly distributing the load to the first support.
Dependencies are inferred from the claim text.