Effect of WO3 on the structure and properties of low sintering temperature and high strength vitrified bonds

The CaOB2O3-Al2O3-SiO2 vitrified bonds are widely used in the manufacture of diamond abrasive tools. The effects of different amounts of WO3 on the structure and properties of the SiO2-B2O3-Al2O3-CaO system vitrified bonds were investigated by differential scanning calorimetry (DSC), Fourier transform infrared (FT-IR), X-ray powder diffraction (XRD), bending strength, thermal expansion coefficients (CTE) and scanning electron microscope (SEM). FT-IR and XRD patterns suggested that the [BO4] tetrahedron decreased, and [BO3] triangle and CaWO4 phase increased with increasing WO3. The bending strength and thermal expansion coefficients (CTE) analyses showed that bending strength of the vitrified bonds increased with increasing WO3, which reached its maximum of 114 MPa, and the CTEs of the varied vitrified bonds approximated to 6.8020 x 10(-6) degrees C-1. The SEM analyses showed the vitrified bond completely wetted diamond grains, enhancing the properties of vitrified bond effectively. (C) 2016 Elsevier B.V. All rights reserved.