A series of Al2O3 microcrystalline ceramics were prepared by atmospheric sintering using La2O3 as sinte-ring aid,focusing on the effect of La2O3 addition on the structure and mechanical properties of Al2O3 ceramics.The av-erage grain size of the samples was between 3～4 μm,and the density,flexural strength and fracture toughness of the samples were significantly improved.Among them,the toughness was highest when the sintering temperature was 1 700 ℃ and the mass fraction of La2O3 was 1.8％.La2O3 was evenly distributed in the ceramic matrix,and the sam-ple phase was mainly Al2O3,and when the mass fraction of La2O3 was higher than 0.9％,a small amount of Lai.4Al22.6O36 phase existed in the sample.
维普
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