Hot‐Pressed ZrB<sub>2</sub> Ceramics With Composite Additives of Zr and B<sub>4</sub>C

Wang, Xingang; Guo, Wei‐Ming; Kan, Yanmei; Zhang, Guojun

doi:10.1002/adem.201000012

Cited by 20 publications

(8 citation statements)

References 28 publications

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“…While indentation fracture is now established as a simple but important technique for determining the fracture toughness of ceramics . Among the indentation equations, we chose a relatively suitable and acceptable one for our ceramics employed by many works …”

Section: Resultsmentioning

confidence: 99%

Preparation and Mechanical Properties of Graphene Nanosheet Reinforced Alumina Composites

Liu

Fan

et al. 2014

Adv Eng Mater

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Dense graphene nanosheets (GNSs)/Al 2 O 3 composites have been prepared by spark plasma sintering from ball milled expanded graphite and Al 2 O 3 powder. GNSs have been found to be homogeneously distributed in the alumina matrix. Results show that the introduction of GNSs leads to obvious refinement of Al 2 O 3 grains and improvement of mechanical properties of the as-prepared composites. Compared with monolithic Al 2 O 3 , the flexural strength, fracture toughness, and Vickers hardness of as-prepared GNSs/Al 2 O 3 samples have been improved by 103, 25, and 26%, respectively, which are attributed to the grain refinement, strong interfacial bonding, and pull-out of GNSs from the matrix.

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Section: Resultsmentioning

confidence: 99%

Preparation and Mechanical Properties of Graphene Nanosheet Reinforced Alumina Composites

Liu

Fan

et al. 2014

Adv Eng Mater

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“…For example, Wang et al . report that Reaction should proceed at temperatures ≥900°C . Therefore, B and C species may react with Zr without the actual formation of B 4.3 C.…”

Section: Resultsmentioning

confidence: 99%

Effect of Carbon and Oxygen on the Densification and Microstructure of Hot Pressed Zirconium Diboride

Harrington

Hilmas

2013

J. Am. Ceram. Soc.

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The role of carbon additions and oxygen content on the densification of zirconium diboride (ZrB 2 ) was studied. ZrB 2 with up to 1 wt% added carbon was hot pressed at temperatures of 2000°C and 2100°C. Nominally pure ZrB 2 hot pressed at 2100°C achieved relative densities >95.5%. Carbon and oxygen analysis indicate that oxygen removal was facilitated by the reduction of oxides with carbon or the removal of boria (B 2 O 3 ) as a vapor. Therefore, by removing oxides from the particle surfaces, carbon additions of ≥0.5 wt% enabled densification to proceed to >96.5% of theoretical at 2000°C. Raman spectroscopy revealed the formation of boron carbide (B 4.3 C) in specimens with carbon additions of ≥0.75 wt%. The formation of B 4.3 C was eliminated via a 1 wt% addition of zirconium hydride (ZrH 2 ), as a source of zirconium, resulting in the formation of carbon as the only residual second phase. Grain sizes were in the range of 7-10 lm (2000°C) and 12-16 lm (2100°C) and only appeared to be controlled by temperature, as no trends due to the evaluated carbon or oxygen contents were observed.

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“…The hardness was measured by the Vickers indentation method (Instron Wilson‐Wolpert Tukon 2100B, Instron Co., Norwood, MA) using a load of 9.8 N and a dwell time of 15 s on a polished surface. The indentation fracture toughness was calculated according to the equation of Evans . The values of hardness and fracture toughness were based on an average of five measurements for each specimen.…”

Section: Methodsmentioning

confidence: 99%

“…The indentation fracture toughness was calculated according to the equation of Evans. 18,19 The values of hardness and fracture toughness were based on an average of five measurements for each specimen. Flexural strength was examined by a three-point bending test on bars with dimensions of 2 mm 9 2.5 mm 9 25 mm.…”

Section: Methodsmentioning

confidence: 99%

Reactive Hot Pressing of ZrC–SiC Ceramics at Low Temperature

et al. 2012

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Composites of ZrC–SiC with relative densities in excess of 98% were prepared by reactive hot pressing of ZrC and Si at temperature as low as 1600°C. The reaction between ZrC and Si resulted in the formation of ZrC1−x, SiC, and ZrSi. Low‐temperature densification of ZrC−SiC ceramics is attributed to the formed nonstoichiometric ZrC1−x and Zr–Si liquid phase. Adding 5 wt% Si to ZrC, the three‐point bending strength of formed ZrC0.8–13.4 vol%SiC ceramics reached 819 ± 102 MPa with hardness and toughness being 20.5 GPa and 3.3 MPa·m1/2, respectively.

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Hot‐Pressed ZrB₂ Ceramics With Composite Additives of Zr and B₄C

Cited by 20 publications

References 28 publications

Preparation and Mechanical Properties of Graphene Nanosheet Reinforced Alumina Composites

Preparation and Mechanical Properties of Graphene Nanosheet Reinforced Alumina Composites

Effect of Carbon and Oxygen on the Densification and Microstructure of Hot Pressed Zirconium Diboride

Reactive Hot Pressing of ZrC–SiC Ceramics at Low Temperature

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Hot‐Pressed ZrB2 Ceramics With Composite Additives of Zr and B4C

Cited by 20 publications

References 28 publications

Preparation and Mechanical Properties of Graphene Nanosheet Reinforced Alumina Composites

Preparation and Mechanical Properties of Graphene Nanosheet Reinforced Alumina Composites

Effect of Carbon and Oxygen on the Densification and Microstructure of Hot Pressed Zirconium Diboride

Reactive Hot Pressing of ZrC–SiC Ceramics at Low Temperature

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Hot‐Pressed ZrB₂ Ceramics With Composite Additives of Zr and B₄C