The existing methods and devices for determining the wearability of various materials when rubbing against fixed and unfastened abrasive particles do not take into account the loss of cutting ability of abrasive grains, changes in the sliding speed during the experience and other factors affecting the accuracy and stability of the results obtained ...

Successes in the synthesis of new superhard materials, in particular, cubic boron nitride (elboron), which has increased heat resistance compared to natural diamond and hard alloy (respectively 1.8 and 1.6 times) and chemical inertness to ferrous compounds, opened wide opportunities to expand and improve the raw material base for the manufacture of drilling rock-destroying tools ...

Standard tungsten-cobalt carbide bonds, depending on their hardness and purpose, are produced by cold (No. 3, 20–25 HRC, and No. 4, 30–35 HRC) and hot (No. 5, 50–55 HRC) pressing. Sintering temperatures of bond matrices vary from 1150 (No. 3) to 1350°C (No. 5) and in a reducing medium do not lead to the appearance of noticeable traces of graphitization or loss of mechanical strength in perfect single crystals of natural diamond.