Mechanical Properties of Injection Molded B4C–C Ceramics

Schwetz, Karl A.; Sigl, Lorenz S.; Pfau, Lothar

doi:10.1006/jssc.1997.7316

Cited by 79 publications

(46 citation statements)

References 9 publications

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“…The addition of carbon has been found to be effective in improving the densification of B4C. 2) Gelcasting is an attractive near-net-shape ceramic-forming techniquewhich can effectively increase materials reliability and lower the manufacturing costs of complex-shaped ceramic parts.…”

Section: Introductionmentioning

confidence: 99%

Aqueous processing of boron carbide powders

Zhang

Jiang

Lin

2008

J. Ceram. Soc. Japan

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The present study was performed to determine suitable processing conditions to obtain optimized boron carbide slurries for gelcasting. We examined how dispersant, pH and other factors function in boron carbide slurries. The effect of the dispersant on the slurry stability was characterized in terms of zeta potential, sedimentation, and rheology measurements. Subsequently, the optimum conditions for the preparation of stable slurries with high solid content were determined. Gelcasting was used to consolidate the slurries. The effect of monomers on the slurry properties was studied. The properties of green and sintered B4C samples were also investigated.

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Section: Introductionmentioning

confidence: 99%

Aqueous processing of boron carbide powders

Zhang

Jiang

Lin

2008

J. Ceram. Soc. Japan

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“…Density of the hot-pressed specimens vs. composition (the amount of vanadium oxide in the mix and the amount of vanadium boride in the composite): the limits of the 95% confidence interval are indicated (here and in Fig. 4) free carbon activates the sintering process, and inclusions of it at the optimal content may promote an increase in crack resistance of the ceramic [13]. We studied mixes containing free carbon in an amount allowing us to obtain hot-pressed specimens with 3 mass% carbon.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and physicomechanical properties of B4C-VB2 composites

Grigor'ev

Kovalchuk

Zaporozhets

et al. 2006

Powder Metall Met Ceram

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We have studied the properties of composites in the B 4 C − VB 2 − C system, obtained by reaction synthesis with hot pressing. We have established that the presence of free carbon and vanadium boride in the ceramic makes it possible to activate the sintering process and to obtain a dense, highly dispersed ceramic with good structural homogeneity parameters for lower isothermal holding temperatures. The composite ceramic has higher hardness and bending strength over a broad range of vanadium boride content than the monophase ceramic based on boron carbide. The strength properties of the composite ceramic containing up to 8 vol.% vanadium boride are improved by means of a mechanism involving propagating cracks bending around obstacles. When the VB 2 concentration increases further, the properties of the composite are determined by a microcracking mechanism. In this case, we observe relatively small changes in the elastic characteristics, which depend linearly on the composition of the ceramic. Introducing vanadium boride into the material is also accompanied by an increase in the contact and microstructural strengths. The results obtained indicate that the new composite material is promising for fabricating wear-resistant and shock-resistant components of various structures and machines.

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“…These metal additions also form substitution compounds with boron carbide. [12][13][14][15][16][17][18] As compared to conventional sintering methods, SPS is regarded as a rapid sintering method that generates highly sintered products in less sintering time with finer grain sizes. [19,20] In the SPS process, the graphite mould and stacked powder experience direct heating by the large pulsed current.…”

Section: Introductionmentioning

confidence: 99%