Notices on Method of Thickness Evaluation of TiN Layers on Magnesium Alloys

Abstract

Widely used in mechanics is the method of surface parameters investigation by indentation of some kind of penetrator into test surfaces and registration of the indentation/load dependence through the whole test duration. A small ball made of hardened steel or diamond pyramid, so-called Berkovich pyramid, is used for penetration. An actuator performing the indentation process is used for displacement enforcement as well as for load measurement. Mainly two types of devices are in use: based on piezoelectric effect or purely electromagnetic LVDT. Knowledge about the penetrator tip is essential for the proper evaluation of the measured parameters and knowledge about the actuation method is also desired for better identification of the whole system parameters when using DSP type algorithms at the stage of experimental data elaboration. In this paper we deal with some kind of DSP elaboration of the experimental data. Our attitude is based on successive digital filtration applied to the experimental data as well as to the intermediate stages of calculation, especially for compliance estimation. Different digital filters have been developed and applied to the experimental data. Some conclusions have been taken out due to the precision of the layer thickness estimation based on data obtained by indentation of the investigated surface with a Berkovich pyramid driven by a piezoelectric actuator. The Boussinesq/Sneddon theory has been used as the basis of our analysis. Titanium azide layers imposed on a magnesium alloy have been tested using PVD method. Obtained results especially due to the hardness/indentation plot allow evaluating the layer thickness, which should be also compared with thickness values evaluated by other methods.

Tribological Investigations of TiC+a-C:H Coatings Manufactured on X38CrMoV5-1 Steel Using PVD Technology

“…13). The wear rate of Al 2 O 3 ball used as a counter-sample at the temperature 25°C is also very small after the 200 meter test (2.628x10 -8 mm 3 /Nm) and after the 800 meter test it decreases to 6.790x10 -9 mm 3 /Nm. At the temperature 200°C the wear rate of Al 2 O 3 ball also decreases.…”

“…The wear rate of 100Cr6 ball used as a counter-sample in friction test of TiC+a:-C:H coating at temperature 25°C is very small after the 200 meter test (6.206x10 -8 mm 3 /Nm) and after the 800 meter test decreases even to 1.777x10 -8 mm 3 /Nm. It means that the 100Cr6 ball probably wears during the running-in and acting at the same time like a polishing leveled the roughness of the coating.…”

“…This equipment allows for deposition of coatings by a physical method, cf. [3][4][5]. It has two independent continuous arc power supplies with magnetic filtration of microdrop for production of metallic plasma (maximum discharge current 180 V), two pulsating carbon plasma power supplies (average pulse power 1 kW) and magnetron source (power 10 kW) with a flat circular target of 100 mm of dimension.…”

“…Steel producers try to outdo one another in developing specialized grades of steel and treatments for them. In this paper, the technology of manufacturing of TiC+a-C:H protective coatings on X38CrMoV5-1 steel using PAPVD (Plasma Activated Physical Vapour Deposition) method [3][4][5] is proposed. Moreover, the tribological investigation concerning measurement of friction coefficient and wear resistance of manufactured coatings is presented.…”

Low friction MoS2TiW coatings manufactured on X38CrMoV5‐1 steel using PVD method

“…The process of manufacturing of these coatings was realized in the Institute of Materials Science at the Technical University of Lodz by using multisource, hybrid factory-scale equipment of type URM 079. This equipment allows for deposition of coatings by the physical method [3][4][5]. It has two independent continuous arc power supplies with magnetic filtration of microdrop for production of metallic plasma (maximum discharge current 180 V), two pulsating carbon plasma power supplies (average pulse power 1 kW) and magnetron source (power 10 kW) with flat circular target of 100 mm of dimension.…”