Effect of Solid Loading of Slurry on Properties of Si3N4 Ceramics Formed by Digital Light Processing

doi:10.15541/jim20210609

Abstract

Abstract:

With the continuous development of science and technology, Si₃N₄ ceramics are playing an increasingly important role in high-tech fields such as aviation machinery, biology and medical treatment. In this work, Si₃N₄ ceramics were successfully prepared by digital light processing (DLP) technology using Si₃N₄ powder coated with Al₂O₃-Y₂O₃ as raw material. Effects of solid loading of slurry on the performance of Si₃N₄ ceramic slurry, Si₃N₄ ceramic green parts and Si₃N₄ceramics were systematically studied. The results showed that when the solid loading of slurry was less than 40.0% (in volume), its viscosity was less than 2 Pa·s at shear rate of 30 s^-1, which can be used for DLP forming. In that case, the single curing depth of the slurry decreased with the increase of solid loading of the slurry, while the relative density and flexural strength of Si₃N₄ ceramics formed by DLP increased firstly and then decreased. The relative density and flexural strength reached the maximum of 89.8% and 162.5 MPa at solid loading of 37.5% (in volume), which were 10% and 16% higher than those with solid loading of 32.5% (in volume), respectively. In this work, the properties of Si₃N₄ ceramics formed by DLP were optimized by determining the best solid loading, which laid the experimental foundation for the photocuring of non-oxide ceramics such as Si₃N₄.

Key words: Si₃N₄, digital light processing, solid loading, relative density, flexural strength

CLC Number:

TQ174

LI Meng, HUANG Hailu, WU Jiamin, LIU Chunlei, WU Yaru, ZHANG Jingxian, SHI Yusheng. Effect of Solid Loading of Slurry on Properties of Si₃N₄ Ceramics Formed by Digital Light Processing[J]. Journal of Inorganic Materials, 2022, 37(3): 310-316.

Figures/Tables 8

Fig. 1 Microstructures, particle size distributions, and EDX mappings of Si3N4 raw powder and Si3N4 powder after being coated (a) Microstructure of Si3N4 raw powder; (b) Particle size distribution of Si3N4 raw powder; (c) Microstructure of Si3N4 powder after being coated; (d) Particle size distribution of Si3N4 powder after being coated; (e) EDX mappings of Si3N4 powder after being coated

Fig. 2 Viscosities at different shear rates (a) and at the shear rate of 30 s-1 (b) of Si3N4 slurries with different solid loadings (in volume)

Fig. 3 Cure depth of Si3N4 slurries at the energy dose of 800 mJ/cm2 with different solid loadings (in volume)

Fig. 4 Optical micrographs of Si3N4 ceramic green parts with different solid loadings (in volume) (a) 32.5%; (b) 35.0%; (c) 37.5%; (d) 40.0%

Fig. 5 Phase compositions of Si3N4 ceramics with different solid loadings (in volume)

Fig. 6 SEM micrographs of the surfaces of Si3N4 ceramics with different solid loadings (in volume) (a) 32.5%; (b) 35.0%; (c) 37.5%; (d) 40.0%

Fig. 7 Cross-sectional SEM micrographs of Si3N4 ceramics with different solid loadings (in volume) (a) 32.5%; (b) 35.0%; (c) 37.5%; (d) 40.0%

Fig. 8 Shrinkage (a), flexural strength and relative density (b) of Si3N4 ceramics with different solid loadings (in volume)

References 30

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Effect of Solid Loading of Slurry on Properties of Si₃N₄ Ceramics Formed by Digital Light Processing

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