Effect of CBN surface coating on properties of abrasive and vitrified CBN composites
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The advantages of CBN abrasive and vitrified bonds allow the wide use of vitrified CBN grinding tools. However, theirproperties can be affected by various factors such as vitrification itself and binding between vitrified bond and abrasive grains. In view of this, the current work aims to improve the binding characteristics of vitrified bond and abrasive grains byelucidating the effect of CBN surface coating. In particular, the thermal properties of typical nickel and titanium coatedabrasive grains were compared with those of ordinary abrasive grains. Furthermore, the strength, microstructure and phasecomposition of vitrified CBN composites were studied as well. According to the results, the thermal stability of abrasive grainsdecreased after coating processing. However, applying the vitrified CBN composite material and sintering, if appropriable, wasshown to ensure protection of the abrasive grains. Moreover, as an intermediate transition layer, the bonding properties ofvitrified bond and abrasive grains can be improved to some extent. Finally, the vitrified Ti-coated CBN composite was foundto possess the best performance.
Abstract
The advantages of CBN abrasive and vitrified bonds allow the wide use of vitrified CBN grinding tools. However, theirproperties can be affected by various factors such as vitrification itself and binding between vitrified bond and abrasive grains. In view of this, the current work aims to improve the binding characteristics of vitrified bond and abrasive grains byelucidating the effect of CBN surface coating. In particular, the thermal properties of typical nickel and titanium coatedabrasive grains were compared with those of ordinary abrasive grains. Furthermore, the strength, microstructure and phasecomposition of vitrified CBN composites were studied as well. According to the results, the thermal stability of abrasive grainsdecreased after coating processing. However, applying the vitrified CBN composite material and sintering, if appropriable, wasshown to ensure protection of the abrasive grains. Moreover, as an intermediate transition layer, the bonding properties ofvitrified bond and abrasive grains can be improved to some extent. Finally, the vitrified Ti-coated CBN composite was foundto possess the best performance.
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