Advanced Digital Workshop: Tribology and Scratch Testing
You already know how to use our tribometer, but you want to understand how testing parameters like sliding speed and contact pressure influence friction coefficient and wear results? Or you are already familiar with the scratch method but want to know how to evaluate scratch resistance and optimize test parameters for thin coating adhesion testing? Then join our advanced digital workshop on tribology and scratch testing.
In Session 1 of this online workshop we will investigate the influence of different testing parameters on the friction coefficient and wear of brake pads. We will also explain the lesser known displayed results and curves obtained when using the linear module of the TRB3.
Sessions 2-4 will focus on the scratch method. During the first scratch session, you will learn how to conduct adhesion tests on thin coatings. Polyimide-coated ITO glasses will be tested using the NST3. We will then focus on the MCT3 for the last two sessions of the webinar. We will start with a brief introduction to the mar resistance of automotive clearcoats, followed by an example of the elastic recovery determination of three types of paint on wood. In the last session of the workshop we will demonstrate the scratch method and more precisely the adhesion determination of an anode coating of a Li-ion battery.
The workshop will last two hours in total (20 to 45 minutes per session), and there will be live demonstrations on the instruments by Anton Paar specialists. You will be able to ask questions after each session.
09:00 – 09:45 (CEST UTC+02:00) Session 1: Tribological studies on brake pads
Brake pads are crucial components in the braking system of vehicles. Composite materials used for brake pads should have reliable frictional and wear properties under different conditions of load, speed, and temperature, and still be highly durable. In this workshop, we will demonstrate how to study brake pads using Anton Paar's pin-on disk tribometer TRB3. The coefficient of friction of the brake pads will be measured using the TRB3. Then, we will investigate the influence of sliding speed and contact pressure on the friction coefficient, wear resistance and therefore braking performance.
09:45 – 10:15 (CEST UTC+02:00) Session 2: Adhesion of thin coatings
Colorless polyimide is a high-performance polymer, and characteristics like high mechanical strength, high dielectric properties, high transmittance and high temperature resistance make it a good candidate for flexible displays and touch panel applications; in recent years, such polymers have undergone rapid development, for extensive application. Along with Indium Tin Oxide (ITO), they are the main choice for conductive optical films.
But such coatings must have perfect adhesion in order to maintain the functionality and performance of a display of a touch panel. Polyimide coatings have thickness in the range of tens to hundreds of nanometers and are therefore suitable for the NST3 instrument. In this part of the workshop we will demonstrate the scratch method and more precisely the adhesion determination of thin polyimide coatings on ITO/glass substrate.
10:15 – 10:35 (CEST UTC+02:00) Session 3: Scratch resistance of paint on wood
Protective polymeric coatings or paints must have excellent scratch resistance. This is characterized by their ability to undergo elastic recovery: full elastic recovery means that there will be no residual damage on the coating. Such a coating has an ideal scratch resistance. In reality however, most coatings recover only partially, or cracks start to appear at low loads. A mar resistance standard determines the degree of elastic recovery and appearance of the first crack of automotive clearcoats. Similar methods can also be used for other types of coatings such as paint on wood. In this workshop we will show how the MCT3 can be used for characterization of the elastic recovery of three types of paint on wood. A brief introduction to the mar resistance of automotive clearcoats will be also given.
10:40 – 11h00 (CEST UTC+02:00) Session 4: Adhesion of coatings on Li-ion batteries
Electrical properties of Li-ion batteries (LIB) such as capacity, number of charging cycles, maximum charging/discharging current etc. are the main characteristics of LIBs. They are determined to a great extent by the composition and structure of the LIB electrodes and separator. Electrodes in Li-ion batteries are coated either with a graphite layer (anode) or with Lithium-based material (cathode). The coating on the electrodes can change its mechanical properties during the production process or due to aging or can even start to delaminate from the current collector. This will lead to a decrease of the capacity of the battery, a decrease of the number of charging/discharging cycles or even to a fire. To measure the adhesion of the electrode coatings a scratch tester can be used. Both the cathode and the anode coatings have thickness in the range of tens of micrometers and they are therefore suitable for the MCT3 instrument. In this part of the workshop we will demonstrate the scratch method on anode coating.
Jiri Nohava is the Head of Product Competence & Lead Application Scientist of the Mechanical Surface Characterization unit at Anton Paar. He obtained his PhD in materials science at the Czech Technical University in Prague. He joined Anton Paar in 2007 and has become a specialist in instrumented indentation and tribology in various domains. His main task is development of new applications with Anton Paar instruments in scientific and industrial projects. He regularly publishes in peer-reviewed journals and participates in international conferences.
Mihaela Dubuisson is Head of Product Management at Anton Paar TriTec. She obtained her engineering degree in materials science at INSA in Rennes (France). She joined Anton Paar TriTec in 2014 and has since become a specialist in instrumented indentation, tribology and scratch testing.
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