Densification and physical properties of SiC-diamond polycrystalline materials produced by pressureless sintering

ZHANG Xiuling; CHEN Yuhong; QI Wubin; ZHANG Qiang; HAI Wanxiu

doi:10.19591/j.cnki.cn11-1974/tf.2021090009

Volume 42 Issue 2

Apr. 2024

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ZHANG Xiuling, CHEN Yuhong, QI Wubin, ZHANG Qiang, HAI Wanxiu. Densification and physical properties of SiC-diamond polycrystalline materials produced by pressureless sintering[J]. Powder Metallurgy Technology, 2024, 42(2): 165-169, 176. doi: 10.19591/j.cnki.cn11-1974/tf.2021090009

Citation:

ZHANG Xiuling, CHEN Yuhong, QI Wubin, ZHANG Qiang, HAI Wanxiu. Densification and physical properties of SiC-diamond polycrystalline materials produced by pressureless sintering[J]. Powder Metallurgy Technology, 2024, 42(2): 165-169, 176. doi: 10.19591/j.cnki.cn11-1974/tf.2021090009

Citation:

ZHANG Xiuling, CHEN Yuhong, QI Wubin, ZHANG Qiang, HAI Wanxiu. Densification and physical properties of SiC-diamond polycrystalline materials produced by pressureless sintering[J]. Powder Metallurgy Technology, 2024, 42(2): 165-169, 176. doi: 10.19591/j.cnki.cn11-1974/tf.2021090009

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Densification and physical properties of SiC-diamond polycrystalline materials produced by pressureless sintering

doi: 10.19591/j.cnki.cn11-1974/tf.2021090009

ZHANG Xiuling¹,
CHEN Yuhong^{1, 2
,
,},
QI Wubin¹,
ZHANG Qiang¹,
HAI Wanxiu^{1, 2}

1.
School of Materials Science and Engineering, North MinZu University, Yinchuan 750021, China
2.
Provincial Key Laboratory of Powder Materials and Special Ceramics, North MinZu University, Yinchuan 750021, China

More Information

Corresponding author: E-mail: lyhcheng@163.com
Received Date: 2022-01-12
Publish Date: 2024-04-28

Abstract

Abstract

SiC-diamond polycrystalline materials doping by diamond with different mass fraction were prepared by pressureless sintering with AlN−Y₂O₃−Sc₂O₃ as liquid phase. The microstructure and thermal properties were analyzed by scanning electron microscopy and laser flash method, respectively. The effects of mass fraction (1.0%, 2.5%, 5.0%) and particle size (0.25 μm, 1.00 μm) of diamond on the densification and mechanical properties of the SiC-diamond polycrystalline materials were studied. The results show that, the relative density of the sintered samples is over 94% when the diamond mass fraction is below to 5.0%, while the relative density of the sample with 5.0% diamond is lower than that of other samples. The relative density of SiC polycrystalline materials decreases with the increase of diamond content, and the excessive diamond in raw materials may reduce the densification of samples. Under the experimental conditions, the grain size does not grow abnormally. The hardness, fracture toughness, and bending strength of the samples are in ranges of 16~18 GPa, 3.8~4.4 MPa·m^1/2, and 239~540 MPa, respectively. The thermal conductivity and thermal diffusion coefficient of samples decrease with the increase of temperature, and the porosity is the main factor affecting the thermal conductivity of the sintered samples.
- SiC polycrystalline materials,
- pressureless sintering,
- densification,
- liquid phase,
- mechanical properties,
- thermal properties

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References(17)

References

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