Data collection, hard material propertie

Hard materials are used as thin hard coatings of some microns thickness for wear protection of tools and machine parts because of their high abrasive wear resistance. For the selection of the coating material the physical, mechanical, and technological properites of these coatings, required by the application, are decisive. The following data collection presents fundamental and available material properties for approximately 130 hard materials as a result of a literature search on carbides, nitrides, borides, silicides, and oxides. 

The following data collection provides an overview of basic properties of hard materials found in the literature. The list is structured according to the chemical composition of the materials. To define hard materials a minimum hardness of HV = 1000 is demanded (definition of Schedler [57]). 

To reduce the size of the table, the given data are as far as possible compressed. One line in the data collection includes data from different authors. Mostly in one reference only single properties of the hard materials are given, so that only the collection of these properties leads to a profile of characteristic properties for a single material. The references are quoted in brackets. 

Table 1. Data collection of properties of hard materials... 

G. Berg, G. Friedrich, E. Broszeit, and C. Berger, Data collection of properties of hard materials, in Handbook of Ceramic Hard Materials, Vol. 2, R. Riedel (Ed.), Wiley-VGH Verlag GmbH, Weinheim, Germany, 2000, pp. 965-990. 

The outstanding achievements of dislocation theory when applied to the mechanical properties of materials make it the natural source for workers in the materials hardness area to turn to when seeking to rationalize collected data. This has been particularly true when hardness anisotropy has been observed and then considered theoretically. 

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