Effect of Industrial Alumina Powder Particle Size on Preparation of Active α-Al2O3 Micropowder

doi:10.19691/j.cnki.1004-4493.2021.03.003

China's Refractories ›› 2021, Vol. 30 ›› Issue (3): 11-16.DOI: 10.19691/j.cnki.1004-4493.2021.03.003

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Effect of Industrial Alumina Powder Particle Size on Preparation of Active α-Al₂O₃ Micropowder

LI Youqi¹^,²^,^*(), WANG Bingwei², ZHANG Yucui², BI Changlu², ZHAO Jizeng¹

1 Luoyang Lier Functional Materials Co., Ltd., Luoyang 471023, China
2 Beijing Lier High-temperature Materials Co., Ltd., Beijing 102211, China

Online:2021-09-15 Published:2021-11-26
Contact: LI Youqi
About author:Dr. Li Youqi graduated from Wuhan University of Science and Technology and majored in Materials Science. He works at Beijing Lier High-temperature Materials Co., Ltd., and serves as the deputy general manager of R&D now. Doctor Li has participated in several national, provincial and municipal research projects on high temperature materials and refractories. He has published more than 20 papers and owned more than 50 patents.

Abstract

Abstract:

To study the effect of the particle size of industrial alumina powder on the properties of active alumina micropowder (α-Al₂O₃ micropowder), the fine powders with the median diameter of 50, 30, 10, and 5 μm, respectively, were obtained by grinding industrial alumina powder (the median diameter of 80 μm), and the active alumina micropowders were prepared by firing the industrial alumina powders before and after grinding at 1 320 ℃ for 5 h. The effect of the particle size of the industrial alumina powder on the microstructure and properties of the active alumina micropowder was researched. The results indicate that the initial particle size of the industrial alumina powder has a great influence on the grain morphology of the active alumina micropowder; when the median diameter is larger than 30 μm, the α-Al₂O₃ grains show worm-like aggregates state after calcination and when it is around or less than 10 μm, the α-Al₂O₃ are round, spherical and well dispersed grains with the particle size of 0.3-1.0 μm. With the initial particle size of the industrial alumina powder decreasing, the α-Al₂O₃ phase transition rate increases and the true density gradually increases; moreover, the α-Al₂O₃ powder shows better dispersity and flowability.

Key words: industrial alumina powder, particle size, α-alumina, microstructure

LI Youqi, WANG Bingwei, ZHANG Yucui, BI Changlu, ZHAO Jizeng. Effect of Industrial Alumina Powder Particle Size on Preparation of Active α-Al₂O₃ Micropowder[J]. China's Refractories, 2021, 30(3): 11-16.

Figures/Tables 9

Table 1 Chemical composition of industrial alumina powder /mass%

Starting material	Al₂O₃	SiO₂	R₂O	CaO	MgO	Fe₂O₃	LOI
Industrial alumina	98.74	0.07	0.32	0.03	0.01	0.02	0.9

Table 2 Particle size distribution of industrial alumina powder before and after grinding

Sample	Particle size distribution /μm	d₁₀ /μm	d₅₀ /μm	d₉₀ /μm
G1	22.2-280.3	48.6	80.6	125.6
G2	8.7-183.4	9.21	50.2	98.4
G3	3.1-144.9	4.74	30.6	57.1
G4	0.8-90.9	1.54	10.5	33.4
G5	0.2-86.6	0.5	5.3	25.2

Fig. 1 XRD patterns of industrial alumina powders before and after grinding

Fig. 2 SEM images of industrial alumina powders with different particle sizes

Fig. 3 Partially magnified SEM images of samples G1 and G5

Fig. 4 SEM images of calcined alumina

Fig. 5 XRD patterns of calcined alumina

Fig. 6 Dispersion of calcined alumina

Fig. 7 True density of calcined alumina

References 14

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Effect of Industrial Alumina Powder Particle Size on Preparation of Active α-Al₂O₃ Micropowder

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