Saunders, S R J; Banks, J P; Wright, M (2001) Measurement of ductile brittle transition temperature of coatings using the small punch test. NPL Report. MATC(A)60

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Abstract

The small punch test has been developed to measure the ductile brittle transition temperature(DBTT) of corrosion and oxidation resistant coatings used to protest gas turbine blades. The test is carried out by tensile deformation of small thin samples of the coated material using a punch pressed into the substrate alloy. The sample is held in a small jig which itself can be placed into a furnace to allow the test to be carried out as a function of temperature. Vertical displacement of the sample is directly monitored by use of a linear variable transducer, and the onset of coating cracking determined by monitoring acoustic emission signals. Results are presented for a number of different MCrAlY and Pt aluminised coatings. In general, as expected, the MCrAlY coatings had lower DBTTs that the Pt aluminised coatings.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MATC(A)60
Keywords:	coatings, ductile brittle transition temperature, small punch test
Subjects:	Advanced Materials Advanced Materials > Surface Engineering
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/2097

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