Oznaczanie odporności na ścieranie powłok metodą ball-cratering

• Autorzy: Osuch-Słomka E. , Szczerek M.

Warianty tytułu

EN

Determination of the abrasion resistance of coatings by a ball-cratering method

• Języki publikacji: PL

Abstrakty

PL

W artykule przedstawiono nową metodę, służącą do oznaczania odporności na ścieranie powłok, o nazwie ball-cratering. Dokonano krótkiego przeglądu literatury opisującej badania prowadzone tą metodą. Zwrócono uwagę na szybkie tempo jej rozwoju i upowszechnienia. Potrzeba pomiarów zużycia ściernego powłok i innych materiałów inżynierskich stała się tak duża, że prowadzone są prace nad znormalizowaniem procedury prowadzenia badań wg metody ball-cratering przez Komitety Normalizacyjne ASTM i ISO. Obecnie obowiązującą jest norma PN-EN 1071-6: 2007 pt. Advanced technical ceramics – Methods of test for ceramic coatings – Part 6: Determination of the abrasion resistance of coatings by a micro-abrasion wear test, mającą status Polskiej Normy; zastąpiła ona normę PN-ENV 1071-6:2003.

EN

The ball-cratering test is becoming popular as a method for the abrasion testing of surface engineered materials. It has many advantages over more conventional abrasion tests including the ability to test small volumes of material and thin coatings, its perceived ease of use and the low cost of the test equipment and it’s versatility. Traditional techniques such as pin-on-disc, reciprocating sliding wear tests or the dry sand rubber wheel test have been used successfully, particularly for thin hard coatings with considerable difficulties in performing test. This is often related to the fact that coating thickness constrains the volume or depth of material that can be removed before the coating is perforated. Thus, for successful measurements of the wear of the coating only small amounts of wear can be tolerated. Traditional methods of measurement, such as mass loss, become ineffective and even techniques, such as profilometry, often cannot be used for components with normal engineering finishes; because the depth of the wear damage is within the uncertainly of measurement caused by the original roughness of the surface. The main parameters that affect wear are the abrasive material and size, the concentration of abrasive particles in the abrasive slurry, the condition of the test ball, and the test load. Changes in the abrasive concentration affect the type of wear that is observed with grooving wear seen with low concentrations (Fig. 3) and higher magnitude rolling wear observed with higher concentration of abrasive (Fig. 4). Variable results were found when polished test balls were used without any preparation. Simple running on preparation treatments have been found to be effective in eliminating this problem. When the test load is raised above a critical value (Fig. 7), abrasive action cannot reach the centre of the contact between the ball and the sample due to the high contact pressures at this point. This leads to the starvation of abrasive from this region, giving rise to the phenomena of "ridging" (Fig. 6). For that reason, testing is only meaningful at test loads below this critical value.

Słowa kluczowe

PL

mikrościeranie; metoda ball-cratering

EN

micro-abrasion; ball-cratering method

• Wydawca: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
• Czasopismo: Tribologia
• Rocznik: 2008
• Tom: nr 6
• Strony: 113--126
• Opis fizyczny: Bibliogr. 29 poz., rys.

Twórcy

autor

Osuch-Słomka E.

autor

Szczerek M.

• Instytut Technologii Eksploatacji – PIB, ul. K. Pułaskiego 6/10, 26-600 Radom

Bibliografia

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