Possibilities of Increase of Adhesion of the Cubic Boron Nitride Coatings by Applying an Interfacial Layers

ON the base of literature data1,9,12-14,16,18]itcan be found,that except of hard layers(for examplenitrides and carbides of transient metals),increasinginterest in superhard materials like boron nitride anddiamond for wear-resistant coatings deposited oncutting tool edges is still growing.Diamond having agreat affinity to iron reacts easily with Fe.It is a seriouslimitation when using diamond for steel machining.Forthis reason tools with diamond coating are used formachining non-ferrous allo…

Possibilities of Increase of Adhesion of the Cubic Boron Nitride Coatings by Applying an Interfacial Layers

In the work the chosen investigations of the adhesion force of thin, superhard coatings to the cutting edges made of cemented carbides are presented. For identification of the adhesion force of coatings to substrate an automatic scratch tester constructed at Poznan University of Technology was applied. The estimation of the adhesion force (value of critical load measured during scratch test) was carried out on the base of the vibration signal. Results of investigations are pointed at the influence of a surface preparation (degreasing, etching, low and high-temperature sputtering) on a critical load values. It was found that the most effective method for surface preparation is low temperature sputtering. The influence of the TiC+Al2O3+TiN interfacial layer on increase of the adhesion force of BN coating to cemented carbides substrate was observed.