Thermal spray metallographic sample mount variables

Thermal Spray Metallographic Sample Mount Variables Metallurgical qc of thermal spray coatings is a vital step for just about any applicator of the group of coatings because unacceptable structure can result in premature failure. More to the point, spalled hard coatings can result in secondary damage in critical aerospace applications so that as a restricting situation within the situation where there's just one engine aircraft as with most military vehicles, failure from the engine can result in mission failure as well as fatalities.

Metallurgical laboratory look at thermal sprayed coatings includes however is not restricted to metallographic study of the sample.

Additional tests for example erosion testing, hardness testing, tensile testing, etc may form area of the overall qc process. While this may be the topic of a whole treatise, we'll limit inside us this short article to metallographic examination especially towards the variables active in the preparation from the mount itself.

For individuals that aren't familiar within the art, effective metallographic evaluation starts with the preparation of a high quality mount. There are many variables involved with this task as discussed with what follows. The first of all variable is incorporated in the selection of the mount material itself. Bakelite is really a generally used material. Two-part epoxy compounds will also be employed by many metallurgists. To supply added strength, fine aluminum oxide powder may also be put into two-part epoxy compounds. For convenient evaluations, hard mounts metallic will also be utilized in the market.

When working with bakelite because the material, one should control the variables of pressure, temperature and duration of pressing to breed top quality mounts repeatedly. When two-part epoxy compounds are utilized, the blending proportion of these two parts have to be controlled along with the quantity of hardening additives for

example aluminum oxide have to be controlled. Mixing some time and subsequent hardening time will also be variables along the way.

The option of metal utilized in the fast mount technique is very critical.

It is crucial that the metal be sufficiently hard so smearing of it doesn't occur throughout the subsequent grinding and polishing steps.

Sometimes hard metal strips may be used juxtaposed towards the coating surface throughout the mounting process for correct edge retention. In such instances, difference in the advantage retention material could producing different effects during subsequent sample preparation processes.

As you can easily see, there are many variables even just in the sample mount preparation process which otherwise controlled can result in erroneous interpretation of coating quality. The very best practice to prevent pitfalls and be sure consistent repeatable quality would be to document the controlling practice of these included in the laboratory manual.

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