Abstract: By adjusting the content of alkali metal oxide Na2O in the vitrified bond, the effect of alkali metal oxide Na2O on the performance of the vitrified bond diamond abrasive tool was explored. When n(Na2O)/n(SiO2)=0.1, the strength (57.7 MPa) and hardness (117HRB) of the abrasive sample are the maximum. With the increase of the alkali metal oxide Na2O, the refractoriness of the vitrified bond decreases significantly, and the fluidity significant increases. The SEM image of the fracture surface of the abrasive tool sample shows that a proper amount of alkali metal oxide Na2O reduces the voids and porosity of the abrasive tool section, the distribution of vitrified bond and abrasive material is more uniform, and the bonding interface between vitrified bond and abrasive material is closer. XRD analysis show that the abrasive sample is sintered at 720 ℃. In addition to the glass phase, a crystal phase is produced in the bond. The content of alkali metal oxide Na2O in the bond has no effect on the type of crystal phase produced after sintering.
Key words: diamond abrasive tool, alkali metal oxide Na2O, vitrified bond, bending strength, hardness, fluidity
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