Pressureless Sintering of Boron Carbide Using Amorphous Boron and SiC as Additives

Boron carbide-based materials B4C-MexBy were densified by pressureless sintering in a vacuum furnace. Some transition metal carbides (TiC, ZrC, HfC, Cr3C2 and WC) from groups IV-VI were used as sintering aids. The optimal sintering temperature in the range 2220-2250oC was used for any composition. Here we show the possibilities to activate the mass transport of the B4C by the mechanism of liquid phase sintering. The method of reactive sintering of B4C in the presence of additives of some transition metal carbides allows in situ synthesis of dense B4C-MexBy materials. Structural properties and fracture toughness of the B4C-based composite materials were discussed. The properties of some of these materials and the possibilities for their application are also discussed.

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Microstructure and deposition mechanism of CVD amorphous boron carbide coatings deposited on SiC substrates at low temperature

Ceramics International ◽

10.1016/j.ceramint.2008.10.020 ◽

2009 ◽

Vol 35 (5) ◽

pp. 1877-1882 ◽

Cited By ~ 13

Author(s):

Bin Zeng ◽

Zude Feng ◽

Siwei Li ◽

Yongsheng Liu ◽

Laifei Cheng ◽

...

Keyword(s):

Low Temperature ◽

Boron Carbide ◽

Amorphous Boron ◽

Deposition Mechanism ◽

Carbide Coatings

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Slip Casting and Pressureless Sintering of Boron Carbide

Improved Ceramics through New Measurements, Processing, and Standards - Ceramic Transactions Series ◽

10.1002/9781118371480.ch31 ◽

2012 ◽

pp. 223-228

Author(s):

Akio Matsumoto ◽

Akira Kawakami ◽

Tatsuya Goto

Keyword(s):

Boron Carbide ◽

Slip Casting ◽

Pressureless Sintering

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Sintering of Commercial B4C with Synthesized B4C Additions

Materials Science Forum ◽

10.4028/www.scientific.net/msf.591-593.588 ◽

2008 ◽

Vol 591-593 ◽

pp. 588-592

Author(s):

Rosa Maria da Rocha ◽

Jonas S. Gutierres ◽

Francisco Cristóvão Lourenço de Melo

Keyword(s):

Thermal Stability ◽

Carbon Source ◽

Carbon Black ◽

Boron Carbide ◽

Carbothermal Reduction ◽

Pressureless Sintering ◽

High Chemical ◽

Powder Mixtures ◽

B4c Powder ◽

Sintered Materials

Boron Carbide is a ceramic material of technological application due to its extreme hardness and high chemical and thermal stability. The effect of synthesized boron carbide addition on pressureless sintering and hot-pressing of a commercial B4C was investigated. B4C synthesized by carbothermal reduction using carbon black as carbon source was mixtured in 10, 30 and 50 wt% to a commercial B4C. Powder mixtures were compacted into pellets and sintered by pressureless sintering at 2050 °C/30min Samples were compared to a pure commercial B4C and characterization results have not showed great differences. Relative densities of as-sintered materials exceed 93% of theoretical for all compositions and microhardness Hv of ∼ 32 GPa was obtained.

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Pressureless sintering of titanium carbide doped with boron or boron carbide

Journal of the European Ceramic Society ◽

10.1016/j.jeurceramsoc.2016.08.035 ◽

2017 ◽

Vol 37 (2) ◽

pp. 539-547 ◽

Cited By ~ 25

Author(s):

Yifeng Gu ◽

Ji-Xuan Liu ◽

Fangfang Xu ◽

Guo-Jun Zhang

Keyword(s):

Titanium Carbide ◽

Boron Carbide ◽

Pressureless Sintering

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Amorphous boron carbide from ab initio simulations

Computational Materials Science ◽

10.1016/j.commatsci.2019.109397 ◽

2020 ◽

Vol 173 ◽

pp. 109397 ◽

Cited By ~ 2

Author(s):

Tevhide Ayça Yıldız ◽

Murat Durandurdu

Keyword(s):

Boron Carbide ◽

Ab Initio ◽

Amorphous Boron ◽

Ab Initio Simulations

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Microwave-assisted pressureless sintering of silicon-reinforced boron carbide composites

Journal of Solid State Chemistry ◽

10.1016/j.jssc.2020.121659 ◽

2020 ◽

Vol 292 ◽

pp. 121659

Author(s):

Boris Dyatkin ◽

Raymond M. Gamache ◽

Benjamin Y. Rock ◽

Syed B. Qadri ◽

William K. Edelen ◽

...

Keyword(s):

Boron Carbide ◽

Pressureless Sintering ◽

Microwave Assisted

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Transition from amorphous boron carbide to hexagonal boron carbon nitride thin films induced by nitrogen ion assistance

Journal of Applied Physics ◽

10.1063/1.1512317 ◽

2002 ◽

Vol 92 (9) ◽

pp. 5177-5182 ◽

Cited By ~ 35

Author(s):

R. Gago ◽

I. Jiménez ◽

F. Agulló-Rueda ◽

J. M Albella ◽

Zs. Czigány ◽

...

Keyword(s):

Thin Films ◽

Boron Carbide ◽

Carbon Nitride ◽

Amorphous Boron ◽

Nitrogen Ion ◽

Boron Carbon Nitride ◽

Ion Assistance ◽

Boron Carbon

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Preparation of 10B Enriched B4C Ceramics by Pressureless Sintering

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.602-603.540 ◽

2014 ◽

Vol 602-603 ◽

pp. 540-543

Author(s):

Yu Jun Zhang ◽

Sha Li Tan ◽

Ru Bin Wei ◽

Shu He Ai ◽

Hai Bin Sun

Keyword(s):

Flexural Strength ◽

Boron Carbide ◽

Relative Density ◽

Sintering Temperature ◽

Raw Material ◽

Carbide Powder ◽

Average Particle ◽

Strength Increase ◽

Pressureless Sintering ◽

Water Reactors

Boron carbide is an attractive neutron absorbing material used both in Fast Breeder Reactors (FBR) and in Pressurised Water Reactors (PWR) owing to its very high absorption cross section for thermal neutrons, chemical stability and refractory character. In the present paper, 10B enriched B4C ceramics are prepared by pressureless sintering at 19602160°C, under argon, using 10B boron carbide powder as raw material, 18 wt% phenolic resin as sintering aid. In the sintering temperature range, with the increasing of sintering temperature, both the relative density and flexural strength increase linearly, the average particle sizes increase from about 3μm at 1960°C to more than 30μm at 2160°C. The sample sintered at 1960°C has a 91.7% of relative density and 192 MPa of flexural strength and a homogeneous texture with 3-4μm particle size, which are enough for pellet application of reactors.

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