Study on the Mechanism of K2O, Na2O and MgO Erosion to CBN
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Diamond and Abrasives Engineering, 2009, Issue 3
Abstract The corrosion degree and reaction mechanism of K2O, Na2O, MgO and other metal oxides on cubic boron nitride (CBN) at high temperature were studied. The results showed that after treatment of CBN in air at 1200 °C for 1 hour, the mass loss percentage was 6.36%, and the single particle compressive strength decreased from 5.94 kg to 5.01 kg. After CBN and K2O, Na2O, and MgO were mixed in a ratio of 2:1 and then treated in air at 1200 °C for 1 hour, the corresponding mass loss percentages were 29.9%, 25.2%, and 18.7%, respectively. The compressive strength was reduced to 2.37, 2.84 and 3.00 kg, respectively. The degree of erosion of CBN is related to the electronegativity of metal elements in alkali metal oxides. The smaller the electronegativity, the greater the degree of reaction. There are many cracks and pits on the surface of the CBN after oxidation, which lowers the strength of the CBN particles, and also indicates that the oxidation reaction on the surface of the CBN is anisotropic.