Effect of powder characteristics on the thermal conductivity and mechanical properties of Si3N4 ceramics sintered by Spark plasma sintering

Aluminum nitride-boron nitride (AlN/BN) composite ceramics were prepared by spark plasma sintering (SPS). The sintering behaviors of AlN/BN composites with 5~15% volume fraction of BN were studied. The influences of BN content, as well as the sintering temperature on the density, microstructure, mechanical strength, thermal conductivity and machinability of the composites were also investigated. The results showed that the full densification of AlN/BN composite ceramics could be realized by SPS technique at the temperature no higher than 1800°C for 3 minutes. The thermal conductivity of AlN/BN composites is in the range of 66~79W/mK, and AlN/BN composites can be cut or drilled by carbides or even steel tools when BN content is 15% volume fraction. The mechanical strength of AlN/BN composites is about 330MPa and is not remarkably affected by the addition of BN. The improvement of mechanical properties of AlN/BN composite ceramics is due to the fine and homogenous microstructure developed in the SPS process.

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Development of Graphene Reinforced Metal Matrix Composite by Spark Plasma Sintering

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i3.32.18397 ◽

2018 ◽

Vol 7 (3.32) ◽

pp. 76

Author(s):

Fei Gao ◽

Yongbum Choi ◽

Yosuke Dobashi ◽

Kazuhiro Matsugi

Keyword(s):

Mechanical Properties ◽

Thermal Conductivity ◽

Spark Plasma Sintering ◽

High Performance ◽

Volume Fraction ◽

Applied Pressure ◽

Ceramic Particle ◽

Plasma Sintering ◽

Spark Plasma ◽

Dispersed Aluminum

In order to obtain the high performance materials with high thermal conductivity, high　electrical conductivity, low thermal expansion, good mechanical properties and low density, Graphene has higher thermal conductivity comparison with other ceramic particle. In this study, graphene dispersed aluminum (Al) composites was developed by spark plasma sintering. Volume fraction of graphene were 10, 20 and 30 vol.%. Fabrication conditions of graphene dispersed aluminum (Al) composites were temperature of 813K and applied pressure of 80 MPa. As composite properties are affected by the dispersibility and volume fraction of the graphene particles, the relationship among the dispersibility of dispersant and the thermal conductivity and mechanical properties was investigated.

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Preparation and Properties of ZrB2-Cu Composites by Spark Plasma Sintering

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.739 ◽

2012 ◽

Vol 512-515 ◽

pp. 739-743 ◽

Cited By ~ 7

Author(s):

S.Z. Zhu ◽

D.L. Gong ◽

Z. Fang ◽

Q. Xu

Keyword(s):

Mechanical Properties ◽

Thermal Conductivity ◽

Relative Density ◽

Spark Plasma Sintering ◽

Volume Fraction ◽

Sintering Temperature ◽

High Electrical Conductivity ◽

Particulate Reinforcement ◽

Plasma Sintering ◽

Spark Plasma

For high thermal conductivity and high electrical conductivity, copper is a good electrode material. The wearing resistance and spark resistance of Cu can be improved with the addition of ZrB2. ZrB2-Cu composites with high Cu volume fraction was successfully prepared by spark plasma sintering (SPS) process in this paper. The microstructure and properties of the sintered samples were characterized. The effect of the sintering temperature and the ZrB2 content in composites on the relative density and properties of the composites were investigated. The results show that the relative density and mechanical properties increase with the sintering temperature increasing. The optimum sintering temperature is 900 °C for 10wt.% ZrB2-Cu, 1000 °C for 20wt.% ZrB2-Cu and 1050 °C for 30wt.% ZrB2-Cu. With the ZrB2 content in composites increasing from 10wt.% to 30 wt.%, the electrical resistivity increases from 2.25×10-6 Ω.cm to 8.82×10-6 Ω.cm, the flexural strength decreases from to 539.1 MPa to 482.2 MPa and the fracture toughness decreases from to 15 MPa.m 1/2 to 9 MPa.m 1/2. The hardness (HV) of ZrB2-Cu composites is significantly enhanced by the ZrB2 particulate reinforcement, increasing from 1410 MPa for 10 wt.% ZrB2 to 2480 MPa for 30wt.% ZrB2.

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Development of TiB2 Dispersed Aluminum Composites by Spark Plasma Sintering

Materials Science Forum ◽

10.4028/www.scientific.net/msf.877.601 ◽

2016 ◽

Vol 877 ◽

pp. 601-605 ◽

Cited By ~ 2

Author(s):

Gen Sasaki ◽

Takaaki Hirose ◽

Yong Bum Choi ◽

Kenji Sugio ◽

Kazuhiro Matsugi

Keyword(s):

Mechanical Properties ◽

Thermal Conductivity ◽

Spark Plasma Sintering ◽

High Performance ◽

Homogeneous Distribution ◽

Heterogeneous Distribution ◽

Plasma Sintering ◽

Low Thermal Expansion ◽

Spark Plasma ◽

Dispersed Aluminum

In order to obtain the high performance materials with high thermal conductivity, high electrical conductivity, low thermal expansion, good mechanical properties and low density, TiB2 particle dispersed aluminum (Al) composites was developed by spark plasma sintering. As these properties are affected by the dispersibility of the particles, the relationship among the dispersibility of dispersant and the thermal conductivity and mechanical properties was investigated, 20 vol. % TiB2 dispersed Al composites with different dispersibility were fabricated by spark plasma sintering (SPS). The dispersibility was estimated quantitatively by using the definition method of local number of particles (LN2DR method), and two composites having 6.884 and 4.839 for number of LN2DR was obtained. Thermal conductivity of the composites with homogeneous distribution of TiB2 particles was lower than that with heterogeneous distribution and clustering. On the other hand, the tensile strength of the composites improved as increasing temperature compared with Al block. Furthermore, strength of the composites with homogeneous distribution of TiB2 particles at 200°C and more was higher than that of the composites with heterogeneous distribution and clustering.

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Fabrication of SiCw/Ti3SiC2 composites with improved thermal conductivity and mechanical properties using spark plasma sintering

Journal of Advanced Ceramics ◽

10.1007/s40145-020-0389-2 ◽

2020 ◽

Vol 9 (4) ◽

pp. 462-470 ◽

Cited By ~ 2

Author(s):

Xiaobing Zhou ◽

Lei Jing ◽

Yong Duk Kwon ◽

Jin-Young Kim ◽

Zhengren Huang ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Conductivity ◽

Spark Plasma Sintering ◽

Plasma Sintering ◽

Spark Plasma

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Improved mechanical properties of dense β-Si3N4 ceramics fabricated by spark plasma sintering with Al2O3-YSZ additives

Processing and Application of Ceramics ◽

10.2298/pac1804313l ◽

2018 ◽

Vol 12 (4) ◽

pp. 313-318

Author(s):

Yang Li ◽

Weiqin Ao ◽

Jihua Gao ◽

Chaohua Zhang ◽

Fusheng Liu ◽

...

Keyword(s):

Mechanical Properties ◽

Spark Plasma Sintering ◽

High Fracture Toughness ◽

X Ray Diffraction ◽

Stabilized Zirconia ◽

High Fracture ◽

X Ray ◽

Plasma Sintering ◽

Spark Plasma ◽

Si3n4 Ceramics

In this work the influence of sintering conditions on structure and mechanical properties of Si3N4 ceramics was investigated. Nearly full dense ?-Si3N4 ceramics with excellent mechanical properties and interlock microstructure of elongated grains was fabricated using Al2O3 and yttria-stabilized zirconia (YSZ with 3mol% Y2O3) as sintering additives by spark plasma sintering (SPS) at relatively low temperature of 1600?C for 15min. X-ray diffraction analysis shows that the SPSed sample is pure ?-Si3N4 phase without any secondary crystalline phase. The elements Al, Zr, Y and O of the additive can diffuse into Si3N4 lattice forming ?-Si3N4- based solid solution. The residual additive formed an amorphous phase at the ?-Si3N4 grain boundaries. The ?-Si3N4 ceramics obtained by SPS using 6.0wt.% Al2O3 and 6.0 wt.% YSZ as additives shows interlock elongated ?-Si3N4 grains of 500 nm in width and 3000 nm in length, high density of 3.29 g/cm3, Vickers hardness of 16.15GPa and high fracture toughness KIC of 6.75MPam1/2.

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Fabrication and Mechanical Properties of ultra fine WC-6wt.%Co by Spark Plasma Sintering Process

Korean Journal of Metals and Materials ◽

10.3365/kjmm.2011.49.1.040 ◽

2011 ◽

Vol 49 (01) ◽

pp. 40-45 ◽

Cited By ~ 4

Author(s):

Hyun-Kuk Park ◽

Seung-Min Lee ◽

Hee-Jun Youn ◽

Ki-Sang Bang ◽

Ik-Hyun Oh

Keyword(s):

Mechanical Properties ◽

Spark Plasma Sintering ◽

Sintering Process ◽

Plasma Sintering ◽

Spark Plasma

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Densification and Thermal Conductivity of Y2O3-Doped AlN Ceramics by Spark Plasma Sintering

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.352.227 ◽

2007 ◽

Vol 352 ◽

pp. 227-231 ◽

Cited By ~ 2

Author(s):

Qiang Shen ◽

Z.D. Wei ◽

Mei Juan Li ◽

Lian Meng Zhang

Keyword(s):

Thermal Conductivity ◽

Grain Boundaries ◽

Spark Plasma Sintering ◽

Particle Surface ◽

Boundary Phase ◽

Homogeneous Microstructure ◽

Densification Mechanism ◽

Sintering Additive ◽

Plasma Sintering ◽

Spark Plasma

AlN ceramics doped with yttrium oxide (Y2O3) as the sintering additive were prepared via the spark plasma sintering (SPS) technique. The sintering behaviors and densification mechanism were mainly investigated. The results showed that Y2O3 addition could promote the AlN densification. Y2O3-doped AlN samples could be densified at low temperatures of 1600-1700oC in 20-25 minutes. The AlN samples were characterized with homogeneous microstructure. The Y-Al-O compounds were created on the grain boundaries due to the reactions between Y2O3 and Al2O3 on AlN particle surface. With increasing the sintering temperature, AlN grains grew up, and the location of grain boundaries as well as the phase compositions changed. The Y/Al ratio in the aluminates increased, from Y3Al5O12 to YAlO3 and to Y4Al2O9. High-density, the growth of AlN grains and the homogenous dispersion of boundary phase were helpful to improve the thermal conductivity of AlN ceramics. The thermal conductivity of 122Wm-1K-1 for the 4.0 mass%Y2O3-doped AlN sample was reached.

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