Abstract: Al2O3 corundum precursor was synthesized by sol-gel technology, and microcrystalline ceramic corundum (SG) abrasive was prepared by traditional sintering technology with SiO2-MgO-CaO as sintering aids and α-Al2O3 nano-powder as crystal seed. The characteristics of seed and thermal properties of gel precursor were analyzed by means of transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetric-calorimetric scanning (TG-DSC). The effects of sintering temperature and holding time on microstructure and mechanical properties of SG abrasive were studied. The results show that α-Al2O3 nano-seed makes the transition temperature of θ-Al2O3→α-Al2O3 decrease by 250 ℃. With increasing sintering temperature and holding time, the single particle compressive strength and density increase first and then decrease, and the grain morphology changes from equiaxed crystal to platelike crystal. Sintering at 1 320 ℃ for 45 min, the single particle compressive strength and density of SG abrasives reach 40.2 N and 3.88 g/cm3, respectively, and the average particle size is 0.56 μm, which is superior to micron seed abrasive samples prepared by traditional sintering technology.
Key words: sol-gel, microcrystalline ceramic, Al2O3 corundum abrasive, single particle compressive strength, sintering aid, crystal seed
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