Effect of SnO on Mechanical Properties of Low Melting Vitrified Bond

Abstract

In this work, the effect of SnO on mechanical properties of low melting vitrified bond for grinding tools were investigated. Alumina composites were prepared by sintering alumina abrasive grains with low melting Na2O-B₂O₃-SiO₂ vitrified bond in air. The refractoriness and fluidity of vitrified bond were measured by traditional method. The Rockwell hardness of sintered specimens was examined by HR-150A. Moreover, the bending strength of specimens was tested by three-point bending strength tester and the microstructure characteristics of specimens were observed by scanning electron microscopy. The results showed that SnO, which was beneficial to reducing the refractoriness and improving the fluidity of vitrified bond, had a major effect on properties of low melting vitrified bond. Therefore, the specimens with favourable properties were obtained, because the interfacial bonding between abrasive grains and the vitrified bond was strengthened.