Effect of Nano-TiO2 on Sintering Characteristics of Al2O3 Ceramics

doi:10.16552/j.cnki.issn1001-1625.2025.0641

Abstract

Abstract:

Al₂O₃ ceramics were prepared by compression molding and pressureless sintering using calcined α-Al₂O₃ powder as raw material， nano-TiO₂ as sintering aid and carboxymethyl cellulose as binder. The effects of sintering temperature and nano-TiO₂ addition on microstructure， linear shrinkage， phase structure， bulk density， porosity， flexural strength and whiteness of Al₂O₃ ceramics were studied， and the sintering characteristics were evaluated. The results show that the addition of appropriate amount of nano-TiO₂ can significantly improve the sintering performance of Al₂O₃ ceramics， while excessive nano-TiO₂ will cause the abnormal growth of Al₂O₃ grains， which will lead to the decrease of shrinkage and bulk density and the increase of porosity. When the addition amount of nano-TiO₂ is 0.7% （mass fraction） and the sintering temperature is 1 500 ℃， the properties of Al₂O₃ ceramics are excellent. The flexural strength reaches the maximum value of （188.89 ± 5.87） MPa， and the bulk density， porosity and whiteness are 3.45 g·cm^-3， 7.78% and 76.6.

Key words: Al₂O₃ ceramics, nano-TiO₂, compression molding, sintering temperature, sintering additive

CLC Number:

TQ174

CHEN Youmei, LI Yicheng, HE Ting, LIU Yingshou, LI Yang, XIAO Hanning, YUAN Mouyun, ZHANG Weiqun. Effect of Nano-TiO₂ on Sintering Characteristics of Al₂O₃ Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(1): 256-263.

Figures/Tables 9

Fig.1 Cross-section microstructure of Al2O3 ceramics with sintering temperature of 1 550 ℃ and different nano-TiO2 addition

Fig.2 Cross-section microstructure of Al2O3 ceramics with different sintering temperatures and 0.7% nano-TiO2 addition

Fig.3 Linear shrinkage of Al2O3 ceramics

Fig.4 XRD patterns of Al2O3 ceramics with 2.0% nano-TiO2 addition

Fig.5 Bulk density of Al2O3 ceramics

Fig.6 Open porosity and total porosity of Al2O3 ceramics

Fig.7 Whiteness of Al2O3 ceramics

Fig.8 Flexural strength of Al2O3 ceramics

Table 1 Flexural strength， bulk density， open porosity and whiteness of Al2O3 ceramics prepared by different additives and sintering processes

Additive	Sintering temperature/℃	Flexural strength/MPa	Bulk density/ （g·cm^-3）	Open porosity/%	Whiteness	Reference
Y₂O₃-TiO₂-MnO₂-ZnCO₃	1 550	218.50	3.68	0.48	—	［25］
Cr₂O₃-Y₂O₃-MgO	1 530	—	3.92	—	—	［26］
CaO-MgO-SiO₂-TiO₂	1 500	356.44	3.72	—	—	［27］
Nano-TiO₂	1 500	188.89±5.87	3.45	7.78	76.6	This work

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Effect of Nano-TiO₂ on Sintering Characteristics of Al₂O₃ Ceramics

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