Gy. Czél-M. Baán-D. Janovszky: New Developed Scratch Tester to Examine Mechanical Strength of Coatings on Metallic Substrate

NEW DEVELOPED SCRATCH TESTER TO EXAMINE MECHANICAL STRENGTH OF COATINGS ON METALLIC SUBSTRATE

Gy. Czél¹, M. Baán², D. Janovszky³

University of Miskolc Department of Non-Metallic Materials

^{2University
of Miskolc, Department of Mechanical Engineering and Technology
^{3University
of Miskolc, Department of Non-Ferrous Materials}}

To evaluate the adhesion strength and intrinsic cohesion of hard and brittle coatings on softer and tougher substrates is an up to date technical problem. Only some reliable laboratory equipment afloat in the car industry and in the tools machinery where the TiN, TiC or the Ti(C, N) coatings developed by CVD or PVD techniques are usually used. Although the scratch test is known for examine the quality of hard coatings but very few of industrial application are published.

There is a new developed scratch and wear testing equipment ( SP 11) developed directly to fulfil the Hungarian industrial and research requirements. The success development was carried out at Miskolc University ( MU ). The PC driven intelligent measuring system has an extended function for simulate the wear process between the metallic substrate and the specimen (especially on hard coatings).

The scope of the present lecture is to explain the SP 11 integrate scratch and micro wear test equipment and the connected evaluation system.

New developed Scratch Tester was built not only for the industry (quality assurance laboratories) but for research institutes as well.

Above the technical details, there is a task to explain the scientific results of mechanical strength measurements of different type coatings on metallic substrate.

Ti N coating on steel substrate, developed by PVD technology was primary applied to examine the tribological aspect of hard coatings on metal. Deterioration of the hard coating was inspected through the built-in optical microscope.

Application of glass on metallic substrate is mainly biomedical challenge. In order to find "bioinert" material for implants, scientist made effort to develop special glass -metal implant material where the glass (Bioglass 4555) coating was deposited on Ti4 A1 metallic substrate by pulsed laser ablation. This material is one of the candidate materials to inspect at the University of Miskolc, in order to evaluate the mechanical strength of glass coating on Titanium alloy.

Further presentation intends to explain the SP-11 Scratch Tester and the preliminary result of mechanical strength measurements was carried out on different type coated materials.

VISSZA