Effect of CuO-TiO_2-SiO_2 additions on the sintering behavior and mechanical properties of corundum abrasive synthesized through sol-gel method

摘要

The effect of ternary compound additives, CuO-TiO_2-SiO_2 on the phase transformation, densification and microstructure of corundum abrasive were investigated. The results showed that the co-doping had synergistic effects on reducing the phase transformation temperature from y- to a-Al_2O_3, enhancing the densification and refining the microstructure of corundum abrasive particles. With the addition of CuO, TiO2 and Si(>2 fixed at 3 wt% of the total weight of abrasive and in the molar ratio of 7:7:5, the samples sintered at 1400 °C for 0.5 h reached about 99.3% of theoretical density. The abrasives exhibited a homogeneous microstructure and excellent mechanical properties with single particle compressive strength higher than 40 N in all doped samples. The influence of each additive and their combined effects on the sintering of abrasives were also discussed in detail.