Effect of iron group metal on the properties of vitrified bond for diamond grinding tool

Iron group metals (Ni, Co, Fe)-doped R₂O-B₂O₃-Al₂O₃-SiO₂ vitrified bond were produced by special powder metallurgy technique. The effect of iron group metals (Ni, Co, Fe) on the refractoriness, fluidity, oxidation, interface and bending strength in the system of R₂O-B₂O₃-Al₂O₃-SiO₂ vitrified bond was studied. The results show that it has little effect on the refractoriness of the vitrified bond with the addition of Ni, but the refractoriness increases with the addition of Co and significantly decreases less than the addition of 20%Fe. When sintering at 750℃ in air, the added metal powders are partly oxidized and the degree of the oxidation is Fe>Co>Ni. The bending strength of vitrified bond increases with different degree by adding metal powders. When the mass fraction of Co is 25%, the bending strength of vitrified bond reaches the maximum value of 75.42 MPa. The close degree for the added metal powders with vitrified bond is Co>Ni>Fe.