Влияние модифицирования поверхности на термостойкость и термопрочность шлифпорошков из синтетических алмазов

Abstract

A method of coating diamonds with thermostable films obtained on the basis of metal oxides and chlorides has been developed, and the influence of different inorganic coatings on synthetic diamond thermostability is analyzed. The kinetics of oxidizing diamonds of various grades and grain sizes coated with thermostable films has been studied. The comparative results of strength test of initial diamonds and heat-treated coated ones are given. It has been established that the best effect is achieved when treating diamonds with solutions of boric anhydride and tungsten oxide. The proposed method provides the 4-5-fold reduction of oxidability at 800 - 900 ⁰C in air. The method of increasing the thermostability of diamonds is recommended for manufacturing drilling and dressing tools.