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Effects of Sm2O3 Content on the Microstructure and Mechanical Properties of Post-Sintered Reaction-Bonded β-SiAlON

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Abstract

β-SiAlON materials were fabricated by a reaction bonding combining post-sintering route using raw materials of Si, Al2O3, AlN, etc. Sm2O3 was used as sintering additive with the content of 0, 2, 4, and 6 wt.%, respectively. The reaction-bonded β-SiAlON (RB-β-SiAlON) were post sintered at 1750 °C for 6 h. XRD results showed that the phase composition of both RB-β-SiAlON and post-sintered RB-β-SiAlON (PSRB-β-SiAlON) was β-SiAlON. For RB-β-SiAlON, the apparent porosity was decreased with the increase of Sm2O3 content, while the bending strength (σf) and Vicker’s hardness (HV10) was increased accordingly. After the post-sintering procedure, nearly full densified PSRB-β-SiAlON was obtained and the mechanical properties were significantly improved with the addition of Sm2O3 additive. The σf and HV10 of the PSRB-β-SiAlON (4 wt.% Sm2O3) achieved 520 MPa and 16.4 GPa, respectively, which were as 3.5 and 6.3 times high as those of the corresponding RB-β-SiAlON. The Young’s modulus (E) and the fracture toughness (K IC) of the dense PSRB-β-SiAlON were increased with the increase of the Sm2O3 content.

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Acknowledgments

This research was financially supported by the Scientific Research Program Funded by Xi’an University of Architecture and Technology (No. RC1529; QN1523), the Scientific Research Program Funded by Shaanxi Provincial Education Department (No. 11JK0789), and the Program for Young Excellent Talents in Shaanxi Province (2013KJXX-50).

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Authors and Affiliations

  1. College of Materials and Mineral Resources, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Yanjun Li & Donghua Liu

  2. State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang, 471039, China

    Cunfeng Zeng

  3. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China

    Zhongqi Shi & Zhihao Jin

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  1. Yanjun Li
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  2. Donghua Liu
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  3. Cunfeng Zeng
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  4. Zhongqi Shi
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  5. Zhihao Jin
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Correspondence to Yanjun Li or Zhongqi Shi.

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Li, Y., Liu, D., Zeng, C. et al. Effects of Sm2O3 Content on the Microstructure and Mechanical Properties of Post-Sintered Reaction-Bonded β-SiAlON. J. of Materi Eng and Perform 25, 1143–1149 (2016). https://doi.org/10.1007/s11665-016-1911-0

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  • DOI: https://doi.org/10.1007/s11665-016-1911-0

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