Scratch tester

Scratch tester

The scratch tester - One of the basic requirements of a coating if it is going to improve the surface propertiesof a tool or component is adhesion. The scratch tester is a common method of testing the adhesion of coatings to substrates.

The scratch tester equipment uses a small diamond stylus to test the adhesion of coatings. The diamond with a radius of 200µm is scratched across the coated surface of a substrate at a constant velocity whilst a load is applied with a constant loading rate. The load on the diamond causes stresses to be increased at the interface between the coating and the substrate that can result in delamination or chipping of the coating to occur. The load at which the coating first delaminates is called the critical load.

Coating failure can be detected using a number of different methods such as a load cell that measures the change in friction, coustic emission or simply looking a the scratch channel under a microscope.

ee also

*Pin on disc tester - Wear and friction tester
*Calo tester - Coating thickness tester

References

* [http://www.pvd-coatings.co.uk/scratch-adhesion-tester.htm Scratch tester]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Calo tester — Coatings with thicknesses typically between 0.1 to 50 micrometres such as PVD coatings or 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 …   Wikipedia

  • WET Web Tester — [ [http://wet.qantom.org Commercial Grade Web Automation Testing offering an Opensource alternative to Quicktest and Silktest ] ] is a web testing tool that drives an IE Browser directly and so the automated testing done is equivalent to how a… …   Wikipedia

  • Pin on disc tribometer — A pin on disc tribometer is the standard equipment used to determine the sliding friction coefficient and wear resistance of surfaces. The tester consists of a stationary pin under an applied load in contact with a rotating disc.Either the pin or …   Wikipedia

  • Physical vapor deposition — (PVD) is a variety of vacuum deposition and is a general term used to describe any of a variety of methods to deposit thin films by the condensation of a vaporized form of the material onto various surfaces (e.g., onto semiconductor wafers). The… …   Wikipedia

  • Adhesion — is the tendency of certain dissimilar molecules to cling together due to attractive forces.Mechanisms of adhesionFive mechanisms have been proposed to explain why one material sticks to another:Mechanical adhesionAdhesive materials fill the voids …   Wikipedia

  • царапание на микро-/наномасштабном уровне — Термин царапание на микро /наномасштабном уровне Термин на английском Micro/nanoscale Scratching Синонимы склерометрия Аббревиатуры Связанные термины Определение процесс измерения твердости методами царапания различных материалов и покрытий при… …   Энциклопедический словарь нанотехнологий

  • Hardness — This article is about mechanical properties of materials. For other uses, see Hard. Hardness is the measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied. Macroscopic hardness is generally… …   Wikipedia

  • Trek Bicycle Corporation —  Pour les articles homophones, voir Trec, TREC et Trec h. Pour les articles homonymes, voir Trek (homonymie) …   Wikipédia en Français

  • Хронология альтернативного рока — Содержание 1 1970 е 1.1 1979 2 1980 е 2.1 1980 2.2 1981 2.3 …   Википедия

  • Sébastien Loeb — Pour les articles homonymes, voir Loeb. Sébastien Loeb Sébastien Loeb lors du rallye d Australie 2009 …   Wikipédia en Français

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”