Raw materials selection applied to glass bonding for vitrified CBN grinding wheels

In this article the selection of more appropriate raw materials applied to alumino-borosilicate glass system for vitrified cubic boron nitride (CBN) grinding wheels was investigated. The selection of raw materials had a major effect on the performance of specimens. Mechanical properties of the specimens were measured by using threepoint bending strength tester and microstructure characteristics of specimens were examined by scanning electron microscopy (SEM). The results showed that the elements barium and magnesium in the form of carbonate were more beneficial to the refractoriness and fluidity of glass binder than in the form of hydrate and oxide. Moreover, the element barium in the form of carbonate was more favorable to mechanical property of glass binder than that in form of hydroxide. But magnesium carbonate was harmful to improve the mechanical property of glass binder. Therefore, selection of appropriate raw materials used in glass binder was dependent on their natural characteristic.