Abstract
Micro-abrasion remains a test configuration hugely used, mainly for thin coatings. Several studies have been carried out investigating the parameters around this configuration. Recently, a new study was launched studying the behavior of different ball materials in abrasive particles’ dynamics in the contact area. This study intends to extend that study, investigating new ball materials never used so far in this test configuration. Thus, commercial balls of American Iron and Steel Institute (AISI) 52100 steel, Stainless Steel (SS) (AISI) 304 steel and Polytetrafluoroethylene (PTFE) were used under different test conditions and abrasive particles, using always the same coating for reference. Craters generated on the coated samples’ surface and tracks on the balls’ surface were carefully observed by Scanning Electron Microscopy (SEM) and 3D microscopy in order to understand the abrasive particles’ dynamics. As a softer material, more abrasive particles were entrapped on the PTFE ball’s surface, generating grooving wear on the samples. SS AISI 304 balls, being softer than the abrasive particles (diamond), also allowed particle entrapment, originating from grooving wear. AISI 52100 steel balls presented particle dynamics that are already known. Thus, this study extends the knowledge already existing, allowing to better select the ball material to be used in ball-cratering tests.
Highlights
ISEP—School of Engineering, Polytechnic of Porto, Rua Dr António Bernardino de Almeida 431, INEGI—Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial, Rua Dr Roberto Frias 400, 4200-465 Porto, Portugal
The surface morphology has a homogeneous aspect as can be confirmed in the image revealed by Scanning Electron Microscopy (SEM), Figure 5a
The measurement detail of the first column deposited at 0.875 μm results from the different levels of polarization used in the deposition process: −105 V in a first phase to improve adhesion, and −90 V in a second phase for the remaining deposition film
Summary
ISEP—School of Engineering, Polytechnic of Porto, Rua Dr António Bernardino de Almeida 431, INEGI—Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial, Rua Dr Roberto Frias 400, 4200-465 Porto, Portugal. A new study was launched studying the behavior of different ball materials in abrasive particles’. This study intends to extend that study, investigating new ball materials never used so far in this test configuration. Craters generated on the coated samples’ surface and tracks on the balls’ surface were carefully observed by Scanning Electron Microscopy (SEM) and 3D microscopy in order to understand the abrasive particles’ dynamics. More abrasive particles were entrapped on the PTFE ball’s surface, generating grooving wear on the samples. SS AISI 304 balls, being softer than the abrasive particles (diamond), allowed particle entrapment, originating from grooving wear. AISI 52100 steel balls presented particle dynamics that are already known. This study extends the knowledge already existing, allowing to better select the ball material to be used in ball-cratering tests
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