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| [[coating|Coatings]] with thicknesses typically between 0.1 to 50 [[micrometre]]s such as [[Physical vapor deposition|PVD coatings]] or [[Chemical vapor deposition|CVD coatings]] are used in many industries to improve the surface properties of tools and components. The '''Calo tester''' is a quick, simple and inexpensive piece of equipment used to measure the thickness of these coatings. The Calo tester also known as a ball craterer or coating thickness tester is also used to measure the amount of coating [[wear]] after a wear test carried out using a [[pin on disc tester]].
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| The Calo tester consists of a holder for the surface to be tested and a [[steel]] [[sphere]] of known [[diameter]] that is rotated against the surface by a rotating shaft connected to a motor whilst [[diamond]] paste is applied to the contact area.
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| The sphere is rotated for a short period of time (less than 20 seconds for a 0.1 to 5 micrometre thickness) but due to the [[abrasive]] nature of the diamond paste this is sufficient time to wear a crater through thin coatings.
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| == Calculating coating thickness using the Calo tester ==
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| An [[optical microscope]] is used to take two measurements after the Calo test across the crater and the coating thickness is calculated using a simple geometrical [[equation]].
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| <math>t = \frac{x y}d</math> | |
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| Where
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| t = coating thickness,
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| d = diameter of the sphere
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| == Other coating testing equipment ==
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| [[Scratch tester]] - Measures [[adhesion]]
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| Pin on disc tester - Measures [[friction]] and wear
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| ==External links==
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| * [http://www.pvd-coatings.co.uk/coating-thickness-tester.htm Calo tester]
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| [[Category:Industrial processes]]
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| [[Category:Measuring instruments]]
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Latest revision as of 02:35, 22 December 2014
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