溶胶-凝胶法结合二步烧结制备陶瓷刚玉磨料的微结构控制及晶粒细化机理

doi:10.19976/j.cnki.43-1448/TF.2022012

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Abstract Ceramic corundum abrasive precursor containing La₂O₃-TiO₂-SiO₂ composite additive was prepared by sol-gel method using pseudo boehmite with grain diameter of 6 μm as raw material. The ceramic corundum abrasives were prepared by conventional sintering method and two-step sintering method, respectively. The microstructure and element distribution of abrasives were analyzed by SEM and TEM, and the grain sizes were analyzed by imagePro software. The results show that the temperature of the first sintering stage significantly affects the final grain size of the abrasive when the two-step sintering method is adopted. Due to the low temperature in the second sintering stage, the later sintering mechanism changes from grain boundary migration to grain boundary diffusion, thus the grains are significantly refined and the abnormal grain grow this avoided. Appropriately reducing the sintering temperature in the second stage is conducive to obtaining fine equiaxed grains with uniform distribution, but it will lead to a decrease in abrasive density. Compared with the corundum abrasives prepared by the traditional sintering method, the abrasives prepared by the two-step sintering method have a smaller grain size, uniform size and high hardness, although the density is reduced. Fine and uniform equiaxed grains are obtained by two-step sintering at 1 300 ℃ and 1 200 ℃ for 10 h, respectively. The average grain size is (334±97) nm, and the density and hardness (HV) are 3.87 g/cm³ and (18.3±0.29) GPa, respectively.

Key words： corundum abrasives two-step sintering grain boundary diffusion microstructure grain refinement

Received: 23 February 2022 Published: 19 July 2022

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	ZHAO Jiong
	LI Zhuan
	ZOU Lingfeng
	TANG Huixian
	XU Yang
	LI Yuxing
	ZOU Huijing

Cite this article:

ZHAO Jiong,LI Zhuan,ZOU Lingfeng, et al. Microstructure control and grain refinement mechanism of ceramic corundum abrasives prepared by sol-gel combined with two step sintering process[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(3): 319-326.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022012 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I3/319

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