High temperature oxidation of high purity nickel: oxide scale morphology and growth kinetics

Authors: Peraldi, Raphaëlle; Monceau, Daniel; Jean, Sylvain; Pieraggi, Bernard

Source: Materials at High Temperatures, Volume 20, Number 4, November 2003 , pp. 649-655(7)

Publisher: Science Reviews 2000 Ltd

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Abstract:

The oxidation of high purity nickel was studied between 600 and 1200°C for scale thickness between 1 and 30 μm. At or above 1100°C, the scale growth kinetics are strictly parabolic. The scales are then compact with columnar and facetted NiO grains. A more complex behaviour is observed below 1000°C: (i) for test temperatures between 1000 and 800°C, mass gain curves cannot be fitted to a parabola, (ii) different scale morphologies and microstructures are observed depending on scale thickness and temperature, (iii) a duplex scale is formed below 800°C. In addition to the possible effect of grain-boundary diffusion, the departure of growth kinetics from simple pure parabolic kinetics could be also related to the complex scale microstructure and its large evolution during scale growth. In situ oxidation of nickel specimens in an environmental SEM equipped with a hot stage specimen holder permitted to follow the morphological evolution of NiO scales. In situ grown NiO scales show the same microstructural features as observed on Ni specimens oxidised for longer duration in pure oxygen at atmospheric pressure.

Keywords: high purity nickel; oxide scale

Document Type: Research article

DOI: http://dx.doi.org/10.3184/096034003782750169

Affiliations: 1: CIRIMAT, INPT-ENSIACET, 31077 Toulouse Cedex 4, France

Publication date: 2003-11-15

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Materials at High Temperatures serves the needs of those who develop and use materials for high temperature applications. It publishes peer reviewed contributions relating to high temperature applications in the power, chemical, engine, processing and furnace industries.
The effects of high temperatures on corrosion, fatigue, creep, strength and wear in alloys, intermetallics, ceramics, refractories and composites are covered. Papers dealing with aspects of materials usage including modelling of behaviour and life prediction will be particularly welcome. The journal has a policy of emphasizing practical aspects and authors presenting results from research programmes are encouraged to relate these, if possible, to actual or potential applications.
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High temperature oxidation of high purity nickel: oxide scale morphology and growth kinetics

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