Gnatenko I. Improving the state evaluation method of tungsten carbide hard metal skeleton and determine the impact of technological factors on it.

The thesis solved scientific-technical problem of improving the method of assessing the state of carbide skeleton of tungsten carbide by determining the optimal mode by detection structure of hard alloys and their carbide skeleton that allowed to quantify the three types of boundary WC-WC in solid alloys and, consequently, to assess the state of carbide skeleton in the production of hard alloys, to increase the stability of manufacturing high quality products. The method of detection of intergrain boundaries in sintered hard alloys of WC-Co and their carbide skeleton that allows to quantify the proportion of the three types of boundary WC-WC: with ideal orientation, size and chemical compliance; full and intermediate mismatch, was developed It was shown that to ensure the required boundaries of various types in the alloy skeleton it is nessasary to use the appropriate methods of influence on the alloy at its sintering: local saturation of a sample with cobalt by the hard alloys treatment to increase the number of boundaries with complete mismatch of the crystal lattice with a view of improving ductility of the alloys; loading the sample with tensile or compressive stresses, also for increasing the number of boundaries with complete mismatch crystal lattices; bonds doping by carbides TaC and VC in an amount of 0.15% by weight of the alloy for reducing the boundaries with the complete mismatch of crystal lattices I the purpose to improve product stability during operation. Technological instruction "Determining the structure of sintered hard alloys of different types of contacts and relevant factors contiguity" was developed and implementated in practice of metallographic laboratories of the V.N/ Bakul ISM NAS Ukraine and State Enterprise "Alcon-tverdosplav".