Combustion Synthesis of Si3N4-BN-SiC Composites by in-situ Introduction of BN and SiC

doi:10.15541/jim20210422

Abstract

Abstract:

Si₃N₄-BN-SiC composites present desirable potential for engineering applications because of their improved mechanical properties and oxidation resistance. In present work, Si₃N₄-BN-SiC composites were successfully fabricated by combustion synthesis using Si, Si₃N₄ diluent, B₄C, and Y₂O₃ as initial powders. BN and SiC were in situ introduced into Si₃N₄ ceramics by the reaction between Si, B₄C, and N₂ gas. The obtained Si₃N₄-BN-SiC composites were composed of elongated β-Si₃N₄ matrix and hollow spherical composites. The formation mechanism of the hollow spherical microstructure was investigated. The results show that the generated SiC and BN particles and glass phase cover on the raw materials, and hollow spherical microstructure is formed when raw particles are depleted. Furthermore, the impacts of B₄C content on the mechanical properties of Si₃N₄-BN-SiC composites were investigated in detail. The in-situ introduction of BN and SiC is beneficial to improving mechanical properties of the composites to some extent. Finally, Si₃N₄-BN-SiC composites with bending strength of 28-144 MPa, fracture toughness of 0.6-2.3 MPa·m ^1/2, Young's modulus of 17.4-54.5 GPa, and porosity of 37.7%-51.8% were obtained for the samples with 0-20% (in mass) B₄C addition.

Key words: combustion synthesis, Si₃N₄-BN-SiC composites, in situ introduction, phase compositions, hollow sphere, formation mechanism

CLC Number:

TQ174

ZHANG Ye, YAO Dongxu, ZUO Kaihui, XIA Yongfeng, YIN Jinwei, ZENG Yuping. Combustion Synthesis of Si₃N₄-BN-SiC Composites by in-situ Introduction of BN and SiC[J]. Journal of Inorganic Materials, 2022, 37(5): 574-578.

Figures/Tables 4

References 24

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Sample	Reaction temperature/℃	Reaction time/s	Open porosity/%	Total porosity/%	Bending strength/MPa	Fracture toughness/ (MPa·m^1/2)	Young's modulus/GPa
SBC00	(1850±15)	(16±3)	(51.8±1.0)	52.0	(120±12.0)	(2.2±0.4)	(49.5±1.6)
SBC05	(1825±20)	(18±5)	(47.3±0.5)	48.5	(144±8.4)	(2.3±0.2)	(54.5±1.7)
SBC10	(1795±12)	(21±2)	(43.3±0.6)	47.5	(108±5.0)	(1.7±0.2)	(46.2±3.0)
SBC15	(1778±20)	(26±5)	(42.3±0.5)	46.9	(30±7.4)	(0.7±0.2)	(18.5±2.1)
SBC20	(1765±14)	(30±3)	(37.7±1.7)	45.2	(28±3.9)	(0.6±0.1)	(17.4±1.2)

Sample	Reaction temperature/℃	Reaction time/s	Open porosity/%	Total porosity/%	Bending strength/MPa	Fracture toughness/ (MPa·m^1/2)	Young's modulus/GPa
SBC00	(1850±15)	(16±3)	(51.8±1.0)	52.0	(120±12.0)	(2.2±0.4)	(49.5±1.6)
SBC05	(1825±20)	(18±5)	(47.3±0.5)	48.5	(144±8.4)	(2.3±0.2)	(54.5±1.7)
SBC10	(1795±12)	(21±2)	(43.3±0.6)	47.5	(108±5.0)	(1.7±0.2)	(46.2±3.0)
SBC15	(1778±20)	(26±5)	(42.3±0.5)	46.9	(30±7.4)	(0.7±0.2)	(18.5±2.1)
SBC20	(1765±14)	(30±3)	(37.7±1.7)	45.2	(28±3.9)	(0.6±0.1)	(17.4±1.2)

Combustion Synthesis of Si₃N₄-BN-SiC Composites by in-situ Introduction of BN and SiC

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