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Hard anodisation of aluminium and its application to sensorics

Rajendran, A and Parmar, Biren J and Sharma, AK and Bhojraj, H and Nayak, MM and Rajanna, K (2005) Hard anodisation of aluminium and its application to sensorics. In: Surface Engineering, 21 (3). pp. 193-197.

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Hard anodising is normally carried out with electrolytes at subzero temperatures and with a very high current density. This may sometimes lead to burning and powdered deposits. In this work, a method of hard anodising at a higher temperature (10 degrees C) using a pulsed power supply is investigated. The quality of coating obtained with this process is better than that obtained with the conventional method. Furthermore, it minimises the refrigeration requirements for cooling the electrolyte and eliminates the problem of burning and powdery coatings. The application of hard anodic coating with insulation resistance 1-30 G Omega up to 100 V dc to a pressure sensor as an insulating base layer is explored. The pressure sensor diaphragm is hard anodised, and this is followed by the deposition of a thin platinum-tungsten (92Pt-8W) film as strain sensor. The fabrication, characterisation and calibration of the pressure sensor and its applications are discussed.

Item Type: Journal Article
Publication: Surface Engineering
Publisher: Institution of Mining and Metallurgy
Additional Information: Copyright of this article belongs to Institution of Mining and Metallurgy.
Keywords: Aluminium Alloys;Anodic Oxide Coating;Hard Anodising;Pressure Sensor;Pulse Power Supply.
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 23 Jul 2009 10:04
Last Modified: 23 Jul 2009 10:04
URI: http://eprints.iisc.ac.in/id/eprint/17109

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