Effect of Z Values on the Microstructure and Mechanical Properties of Post-sintered Reaction Bonded β-SiAlON

β-SiAlON materials with different values ( =0.5–3) were fabricated by a reaction bonding combining post-sintering route using raw materials of Si, Al , AlN, etc. The reaction bonded β-SiAlON (RB-β-SiAlON) were post-sintered at 1,750 °C for 6 h. Apparent porosity, bulk density, bending strength and V...

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Bibliographic Details
Published in:High temperature materials and processes 2017-05, Vol.36 (5), p.453-458
Main Authors: Li, Yanjun, Liu, Donghua, Jin, Han, Ding, Donghai, Xiao, Guoqing, Shi, Zhongqi, Jin, Zhihao
Format: Article
Language:English
Subjects:
Aluminum oxide
Bend strength
Bulk density
Hardness
Mechanical properties
Phase composition
Porosity
post-sintering
Raw materials
Reaction bonding
SiAlON
Silicon
Sintering
Sintering (powder metallurgy)
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Summary:β-SiAlON materials with different values ( =0.5–3) were fabricated by a reaction bonding combining post-sintering route using raw materials of Si, Al , AlN, etc. The reaction bonded β-SiAlON (RB-β-SiAlON) were post-sintered at 1,750 °C for 6 h. Apparent porosity, bulk density, bending strength and Vicker’s hardness of the samples before and after post-sintering were tested. XRD results showed that the phase composition of both RB-β-SiAlON and post-sintered RB-β-SiAlON (PSRB-β-SiAlON) were β-SiAlON. For RB-β-SiAlON, the apparent porosity was decreased with the increase of values, while the strength and hardness was increased accordingly. After the post-sintering procedure, nearly full densified PSRB-β-SiAlON was obtained and the mechanical properties were significantly improved. The bending strength and Vicker’s hardness of the PSRB-β-SiAlON ( =0.5) achieved 510 MPa and 16.5 GPa, respectively, which were as 2.7 and 6.7 times high as those of the corresponding RB-β-SiAlON. However, the strength and hardness of PSRB-β-SiAlON decreased with the increase of value due to the grain growth.
ISSN:0334-6455
2191-0324
DOI:10.1515/htmp-2015-0256