Influence of BaO–B2O3–SiO2 additives on the sintering behavior of corundum abrasive synthesized through sol–gel method

摘要

The effects of the new additives system BaO–B₂O₃–SiO₂ on the corundum abrasive synthesized by sol–gel process were investigated. The thermal behavior of the xerogel was examined by thermogravimetry-differential scanning calorimetry (TG-DSC) and X-ray diffractometer (XRD). The results showed that the phase transformation temperature from γ- to α-Al₂O₃ was reduced. With the addition of BaO, B₂O₃ and SiO₂ fixed at 1.5 wt % of the total weight of corundum abrasive and in the molar ratio of 8:12:80, the samples sintered at 1400°C for 0.5 h reached about 99.4% of theoretical density. The single particle compressive strength was higher than 45 N with a homogeneous microstructure. The influence of each additive and their synergetic interactions on the sintering of abrasives were also discussed in detail.