The effects of ZrO2 on the physical and mechanical properties of vitrified bond and vitrified boron nitride (CBN) compositeswere systematically investigated. The basic vitrified bond (B2O3-Al2O3-SiO2-Li2O-Na2O) and ZrO2 make up the vitrified bond,and then constitute the vitrified CBN composites consists together with CBN abrasives. The addition of ZrO2 has a certaininfluence on refractoriness, liquidity, bending strength of vitrified bond. With the increase of adding amount of ZrO2 therefractoriness of vitrified bonds gradually rises, and fluidity of vitrified bonds becomes lower. When the ZrO2 addition amountreaches a certain extent, the crystalline phase-ZrSiO4 will appear during the sintering process. In addition, the ZrO2 can addto a certain extent, improve the strength of the bond and CBN composites, when ZrO2 addition amount of 8 wt.%, theperformance of the vitrified bond is the most. Its value changes from 69.74 MPa to 87.45 MPa.

Keywords: Vitrified bond, CBN, ZrO2, Refractoriness, Bending strength