Evaluation of Adhesive Strength of Thin Plasma Sprayed Oxide Coatings by a Crosshatch Testing Method
Venkataraman, R
Research Fellow, National Metallurgical Laboratory, Jamshedpur, 831007, India

Sampath Kumar, TS
Professor, Indian Institute of Technology-Madras, Chennai, 600036, India

Ramalingam, K
Professor, Indian Institute of Technology-Madras, Chennai, 600036, India

(Received 14 March 2005; accepted 15 February 2006)

Abstract

A test method for the evaluation of the adhesive strength of coatings of thickness less than 250 μms has been attempted on coupons of pure alumina and alumina-13 wt % titania samples plasma sprayed on low alloy steel substrates. Crosshatches were made with a diamond tipped wheel with 0.02-mm width and 20-mm bore diameter, which was mounted on a common tooling and grinding machine. Cuts with 5×5 mm were made on the as-sprayed surface; subsequently, a pressure-sensitive tape was applied on the hatched surface and pulled off. The area of the coatings thus removed was interpreted in accordance with ASTM D 3359B testing standard; the testing method seems to be appropriate for qualitative evaluations.

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Author Venkataraman R, Sampath Kumar TS, Ramalingam K Title Evaluation of Adhesive Strength of Thin Plasma Sprayed Oxide Coatings by a Crosshatch Testing Method Symposium , Committee: on