Densification and mechanical properties of boron carbide prepared via spark plasma sintering with cubic boron nitride as an additive

SiAlON-cubic boron nitride (cBN) composite was prepared by spark plasma sintering (SPS) using -SiAlON and cBN powders as starting materials, and the effect of holding time on densification, phase transformation and hardness of the composite was investigated. The SiAlON-cBN composite containing 20 vol% cBN sintered at 1650oC for 60s was densified to >97% of theoretical density. cBN phase transformed to hexagonal boron nitride (hBN) in the SiAlON-cBN composite with increasing holding time at 1650oC. Vickers hardness of the SiAlON-20vol%cBN composite sintered at 1650oC for 60-300s was 17.7GPa, and the hardness decreased with increasing holding time.

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Bio-inspired structured boron carbide-boron nitride composite by reactive spark plasma sintering

Virtual and Physical Prototyping ◽

10.1080/17452759.2013.862959 ◽

2013 ◽

Vol 8 (4) ◽

pp. 253-258

Author(s):

Sky Shumao Xie ◽

Oleg Vasylkiv ◽

V. Silberschmidt ◽

Alfred I.Y. Tok

Keyword(s):

Boron Nitride ◽

Boron Carbide ◽

Spark Plasma Sintering ◽

Plasma Sintering ◽

Spark Plasma

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Influence of Sintering Process Conditions on Microstructural and Mechanical Properties of Boron Carbide Ceramics Synthesized by Spark Plasma Sintering

Materials ◽

10.3390/ma14051100 ◽

2021 ◽

Vol 14 (5) ◽

pp. 1100

Author(s):

Yingying Liu ◽

Sheng Ge ◽

Yihua Huang ◽

Zhengren Huang ◽

Deku Zhang

Keyword(s):

Mechanical Properties ◽

Boron Carbide ◽

Spark Plasma Sintering ◽

Mechanical Performance ◽

Electron Backscatter Diffraction ◽

Holding Time ◽

Process Conditions ◽

Sintering Process ◽

Plasma Sintering ◽

Spark Plasma

Boron carbide (B4C) ceramics were synthesized by spark plasma sintering at a temperature between 1600 and 2050 °C without employing any sintering additives. The effect of sintering process parameters, such as temperature, holding time, pressure, hearting rate, and pulsed electric current, and the particle size of the raw powder on the densification behavior and mechanical properties of B4C ceramics, were comprehensively and systematically investigated. Hardness and fracture toughness of B4C that has a density close to the theoretical value were found to be 33.5 ± 0.2 GPa and 3.21 ± 0.13 MPa·m1/2, respectively. Electron backscatter diffraction (EBSD) analysis revealed no abnormal growth of grains due to an increase in holding time and pressure. Twin structures present in ceramics are beneficial for their mechanical performance.

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Spark Plasma Sintering of βSiAlON-cBN Composite

Materials Science Forum ◽

10.4028/www.scientific.net/msf.561-565.599 ◽

2007 ◽

Vol 561-565 ◽

pp. 599-602 ◽

Cited By ~ 12

Author(s):

Mikinori Hotta ◽

Takashi Goto

Keyword(s):

Phase Transformation ◽

Boron Nitride ◽

Spark Plasma Sintering ◽

Firing Temperature ◽

Vickers Hardness ◽

Cubic Boron Nitride ◽

Theoretical Density ◽

Maximum Value ◽

Plasma Sintering ◽

Spark Plasma

βSiAlON-cubic boron nitride (cBN) composites were prepared from β-SiAlON and cBN powders using spark plasma sintering (SPS) at firing temperature of 1600-1900oC under pressure of 100MPa, and densification, phase transformation and hardness of the composites were investigated. The phase transformation of cBN to hexagonal BN (hBN) was inhibited in βSiAlON-cBN composite. βSiAlON-cBN composites containing 10-30 vol% cBN fired at 1650oC were densified to 95-98% of theoretical density with no transformation of cBN to hBN. Vickers hardness of the βSiAlON-cBN composite containing 20 vol% cBN fired at 1650oC was 17.5 GPa in maximum value, and the hardness significantly decreased as cBN phase was transformed to hBN in the composites.

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