Additive Effect on Sintering of Boron Carbide

Kanno, Yoshinori; Kawase, Kaoru; Nakano, Kikuo

doi:10.2109/jcersj1950.95.1107_1137

Cited by 20 publications

(8 citation statements)

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“…This process eliminates most of the internal voids; however, it is difficult to reach full densification under these conditions. Thus, it has been common practice to add sintering additives to enhance densification of BC powder . Nonoxide additives, such as free carbon, also improve this process .…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of Mechanical Properties in a Hot‐Pressed Boron Carbide

Farbaniec

Hogan

McCauley

et al. 2016

Int J Applied Ceramic Tech

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Effects of microstructure and material properties on the mechanical behavior of hot‐pressed boron carbide are presented. The microstructure and intrinsic microstructural inhomogeneities have been characterized using scanning electron microscopy characterization techniques (SEM/EDS/EBSD). In situ mechanical characterizations of the boron carbide microstructure and its larger inhomogeneities have been performed by nanoindentation. Macroscopic dynamic and quasi‐static compressive responses have been studied in two characteristic orientations (parallel and perpendicular to the hot‐pressing direction) using a modified compression Kolsky bar setup (strain rates of 102−103/s) and standard MTS test machine (strain rates of 10−4−10−3/s). The microstructure characterization showed that boron carbide has a fine‐grained microstructure with a complex superposition of nonmetallic inclusions, such as free carbon, AlN, and BN. Nanoindentation tests conducted in three principal planes of the plate revealed an anisotropy of the mechanical properties. The compression tests revealed that the strength of this hot‐pressed boron carbide is orientation dependent. Detailed SEM analysis indicated transgranular fracture and microcracking originating at large carbon inclusions. Influences of microstructural anisotropy on the mechanical response of the material are discussed.

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Section: Introductionmentioning

confidence: 99%

Anisotropy of Mechanical Properties in a Hot‐Pressed Boron Carbide

Farbaniec

Hogan

McCauley

et al. 2016

Int J Applied Ceramic Tech

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“…4 Various studies have already been carried out on the sintering of boron carbide with the help of transition elements, transitional element oxides, or nonoxide materials such as Al, Fe, TiO 2 , SiC, and TiC. [5][6][7] All of these sintering aids have been effective for sintering. However in such cases, the dopants change physical properties because of the presence of large amounts of secondary phases.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric properties and spark plasma sintering of doped YB₂₂C₂N

2010

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YB 22 C 2 N is one of a series of rare earth borocarbonitrides and is potentially the long awaited n-type counterpart to boron carbide. We conducted studies on YB 22 C 2 N spark plasma sintered with additions of YB 4 and YB 25 C, including the investigations of the densification process and the thermoelectric properties of the material. We discovered that a small amount of dopants can lower the starting temperature of densification during spark plasma sintering (SPS). Variations of pressure and temperature during the sintering process are also found to have an effect. Electrical conductivity of the dense samples has increased due to insertion of metal borides and also because of the improvement of the relative density. At the same time, only a slight reduction was observed for the Seebeck coefficient leading to an important improvement of power factor. The highest density of more than 95% was achieved with 5 wt% of YB 25 (C) dopant.

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“…This observation is comparable to the effect of silicon and silicon carbide addition on the sintering behavior of boron carbide, which is structurally related to YB 22 C 2 N. A previous study pointed out that, for ''B 4 C'' sintering, Si additives tends to restrain grain growth, while SiC additives prevent the densification process. 9 As in the ''B 4 C'' case, we noticed that the addition of silicon carbide favored grain growth. It is important to note that the relative density is lower for the sample doped with SiC despite the fact that the porosity appears to be higher for the sample doped with Si, see Fig.…”

Section: Sintering Of Yb 22 C 2 N Powder With Si and Sicmentioning

confidence: 52%

“…The efficacy of various additives for densification of boron carbide has already been studied, such as some transition elements, transition-metal oxides or nonoxide materials such as Al, Fe, TiO 2 , SiC, and TiC. [9][10][11] In consideration of such previous work on ''B 4 C,'' we decided to work with similar additives such as Si, SiC, Al, and TiC, to determine their effect on the densification process and thermoelectric properties of YB 22 C 2 N. In addition, in this work we evaluate the effect of atmosphere during sintering. Nitrogen and argon atmospheres have been used as sintering media.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Thermoelectric Properties of Dense YB22C2N Samples Fabricated Through Spark Plasma Sintering

Berthebaud

Nishimura

Mori

2011

Journal of Elec Materi

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Dense samples of the higher boride YB 22 C 2 N have been fabricated through the spark plasma sintering (SPS) method with different sintering aids. YB 22 C 2 N is a representative of a series of newly discovered rare-earth borocarbonitrides, which may be the long-awaited n-type counterpart of boron carbide, ''B 4 C.'' The effect of Si, SiC, Al, and TiC additions on the sintering process of YB 22 C 2 N has been studied. The best sintered bodies with densities higher than 90% of theoretical density were obtained by means of SPS at 1700°C. We show that the additive choice and pressure have an effect on grain size and density. An investigation of the effect of atmosphere on the sintering behavior has also been carried out. It was found that sinterability is enhanced under nitrogen atmosphere. Thermoelectric properties of the materials sintered with additives have been evaluated, and we discuss their dependences on the fabrication process route.

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Additive Effect on Sintering of Boron Carbide

Cited by 20 publications

References 0 publications

Anisotropy of Mechanical Properties in a Hot‐Pressed Boron Carbide

Anisotropy of Mechanical Properties in a Hot‐Pressed Boron Carbide

Thermoelectric properties and spark plasma sintering of doped YB₂₂C₂N

Microstructure and Thermoelectric Properties of Dense YB22C2N Samples Fabricated Through Spark Plasma Sintering

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Additive Effect on Sintering of Boron Carbide

Cited by 20 publications

References 0 publications

Anisotropy of Mechanical Properties in a Hot‐Pressed Boron Carbide

Anisotropy of Mechanical Properties in a Hot‐Pressed Boron Carbide

Thermoelectric properties and spark plasma sintering of doped YB22C2N

Microstructure and Thermoelectric Properties of Dense YB22C2N Samples Fabricated Through Spark Plasma Sintering

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Thermoelectric properties and spark plasma sintering of doped YB₂₂C₂N