Boride‐Based Hard Materials

Telle, Rainer; Sigl, Lorenz S.; Takagi, Ken‐ichi

doi:10.1002/9783527618217.ch22

Cited by 111 publications

(129 citation statements)

References 158 publications

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“…Liquid phase sintering is expected to be an alternative method for fabricating dense B 4 C ceramics with improved mechanical properties, analogously to the densification of covalent non-oxide ceramics such as silicon carbide and silicon nitride [4].…”

Section: Introductionmentioning

confidence: 99%

“…However, its disadvantages are the limited strength and fracture toughness as well as poor sinterability and machinability. Due to the very strong covalent bonds, the high resistance to grain boundary sliding and absence of plasticity, densification of stoichiometric boron carbide (B 4 C) is extremely difficult [4]. Simple shapes of dense boron carbide are industrially prepared by hot pressing under vacuum or inert atmosphere fine (<3 mm) pure powder at high temperature (2100-2200 8C) and pressures of 30-40 MPa for 15-45 min holding time, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Pressureless sintering of boron carbide

Mashhadi

Taheri-Nassaj

Sglavo

2010

Ceramics International

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pressureless sintering of boron carbide

Mashhadi

Taheri-Nassaj

Sglavo

2010

Ceramics International

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“…The hardness of this composite was observed to increase with increasing temperature [6,7]. For this reason, these composites are used for the manufacturing of matrices and cutting tools, heat exchanger elements, and combustion engine elements.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characteristics of nanocrystalline materials in Ti, B, C and N containing system

et al. 2011

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Abstract:In this work, the results of investigations of manufacturing ceramic materials on the basis of Ti, B, C and N containing systems are presented. The nanocrystalline ceramics were synthesized using a non-hydrolytic sol-gel method. The process was carried out in two stages. In the first low-temperature stage the precursor was obtained. The synthesis of ceramic phases, however, was conducted in the second high-temperature stage, in an argon atmosphere. Depending on the initial composition of the mixtures, the temperature and the time, the following products were obtained: TiC x , TiC x N 1−x , TiB 2 and B 4 C. The course of the process was investigated by thermogravimetric and differential scanning calorimetry methods (TG-DSC) coupled with mass spectrometry (MS). The solid state products were identified with use of X-ray diffraction (XRD). The size of the crystallites was estimated by the Scherrer method. The structure and morphology images of nanocrystalline powders were obtained using scanning electron microscopy (SEM) and transmission electron microscopy (TEM).

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“…However, as brittleness of the material, catastrophic damage may be caused by thermal shock [1][2][3][4][5][6][7][8]. It is necessary to improve thermal shock properties of ceramic matrix composite, and characterize thermal shock properties of ceramic matrix composite properly [9,10].…”

Section: Introductionmentioning

confidence: 99%

Thermal Shock Properties of ZrB2-SiCp-Graphite and ZrB2-SiCp-AlN Ceramic Matrix Composite Material

Liu¹,

Wang²,

Liu³

2011

TOMSJ

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Thermal shock property of the material can be improved by improving fracture property of the material. In this paper, factors affecting fracture property have been studied and the effect of residual stress, microstructure, strain rate and stress concentration on fracture property of material has been analyzed, which may provide help for improving thermal shock property of material. Thermal shock stability for ZrB2-SiCp-Graphite(ZSG) and ZrB2-SiCp-AlN (ZSA) was investigated by water quenching test, which indicated that ZSC may provide more stable thermal shock properties. As shown by SEM of ZSA, surface cracks appeared after it was cooled from 1200°C due to thermal shock instability of the material. Residual flexural strength of ZSA was improved by crack healing after it was cooled from 1450°C. However, no surface crack appeared for ZSG after water quenching test. This paper may provided a potential method for improving thermal shock stability of zirconium diboride ceramic matrix composites by introducing proper quantities of graphite.

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Boride‐Based Hard Materials

Cited by 111 publications

References 158 publications

Pressureless sintering of boron carbide

Pressureless sintering of boron carbide

Synthesis and characteristics of nanocrystalline materials in Ti, B, C and N containing system

Thermal Shock Properties of ZrB2-SiCp-Graphite and ZrB2-SiCp-AlN Ceramic Matrix Composite Material

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