Results 141 to 150 of about 780 (184)

In situ synthesis of ZrB2–ZrCx ceramic tool materials toughened by elongated ZrB2 grains

Materials & Design, 2013
Abstract ZrB 2 –ZrC x ceramic tool materials toughened by elongated ZrB 2 grains were fabricated via an in situ reactive hot pressing process. The product showed an excellent fracture toughness of 9.69 MPa m 1/2 and a flexural strength of 898.13 MPa.
Liang Xu, Chuanzhen Huang, Hanlian Liu, Bin Zou, Hongtao Zhu, Guolong Zhao, Jun Wang   +6 more
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Oxidation of Zrb2-Sic

2008
In this paper the oxidation behavior of ZrB2-20 vol% SiC is examined. Samples were exposed in stagnant air in a zirconia furnace (Deltech, Inc.) at temperatures of 1327, 1627, and 1927 C for ten ten-minute cycles. Samples were removed from the furnace after one, five, and ten cycles.
Elizabeth J. Opila, Michael C. Halbig
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Development of ZrO2–ZrB2 composites

Journal of Alloys and Compounds, 2002
Abstract Yttria-stabilised tetragonal zirconia (Y-TZP) composites with 30 vol.% ZrB 2 are prepared by hot pressing in vacuum for 1 h at 1450°C. Different commercial zirconia starting powders as well as a range of ZrO 2 ‘powder mixture’ grades, based on co-precipitated powders were used for the composite production.
B Basu, J Vleugels, O Van Der Biest
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ZrB2 ceramics doped with AlB2

Ceramics International, 2014
AlB2 is usedasasinteringadditivetodensifyZrB2 ceramics. TheAlB2 phase playsapositiveroleinthedensification processofZrB2 ceramics byremovingtheoxygenimpurityandliquidphasesintering.With5vol%AlB2 addition, bothmechanicalpropertiesandoxidation resistance canbeimprovedcomparedwithmonolithicZrB2 ceramics.
Jian Zhao, Hai-Tao Liu, Ji-Xuan Liu, Guo-Jun Zhang   +3 more
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In situ fabrication of ZrB2–SiC composite with arrayed ZrB2 micro-rods by arc-melting

Scripta Materialia, 2012
ZrB2–SiC composite with textured microstructure consisting of rod-like ZrB2 grains in the SiC matrix is fabricated from a mixture of Zr, B4C and SiC powders by arc-melting. The ZrB2 rods are well aligned and embedded in the SiC matrix with well-combined interfaces.
Zhe Ren, Xi-bao Wang, Ya-li Li, Tao Huang, Li-jie Guo   +4 more
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Processing and Deformation of ZrB2

2012
Zirconium diboride, ZrB2, based materials have been proposed for structural applications at ultra-high temperatures (>2000 [degrees] C). However, their mechanical behaviour at such temperatures is only poorly documented. In this work, the processing and the deformation behaviour of ZrB2 at temperatures up to 2000 [degrees] C is investigated ...
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Toughening of ZrB2–SiC ceramics with the microstructure ZrB2/Zr–Al–C fibrous monolith

Scripta Materialia, 2012
A ZrB 2 –20 vol.% SiC–30 vol.% Zr–Al–C ceramic was fabricated by hot pressing at 1900 °C and 30 MPa for 1 h in vacuum. The ZrB 2 –SiC/Zr–Al–C ceramic showed an excellent fracture toughness of 5.4 ± 0.4 MPa m 1/2 due to its ZrB 2 /Zr–Al–C fibrous monolith microstructure and the in situ formed layered Zr–Al–C grains, which could enhance crack deflection,
Qilong Guo, Junguo Li, Qiang Shen, Lianmeng Zhang   +3 more
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Reactions in the system ZrC-ZrB2

Soviet Powder Metallurgy and Metal Ceramics, 1975
It is shown that in the system ZrC-ZrB2 there is virtually no intersolubility of the components up to 2100°C, and it is only at a temperature of 2650°C that some dissolution of ZrB2 (
S. S. Ordan'yan, V. I. Unrod
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ZrB2–MoSi2 composites toughened by elongated ZrB2 grains via reactive hot pressing

Scripta Materialia, 2009
ZrB2–20 vol.% MoSi2 composites with elongated ZrB2 grains were prepared by reactive hot pressing using Zr, Si, B and Mo as raw materials. The ductile behavior of MoSi2 at high temperature helped the rod-like ZrB2 grains align under the applied pressure during sintering, resulting in a partly textured composite.
Wen-Wen Wu, Zhuo Wang, Guo-Jun Zhang, Yan-Mei Kan, Pei-Ling Wang   +4 more
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Effects of ZrB2 contents on the mechanical properties and thermal shock resistance of B4C–ZrB2 ceramics

Materials & Design, 2015
Abstract B4C–ZrB2 ceramics with different ZrB2 contents were fabricated using hot-pressing technique. The introduction of ZrB2 greatly promotes the sintering process, and all B4C–ZrB2 samples achieve full densification. With the ZrB2 content increasing from 10 to 40 vol.%, the Vickers hardness ranges from 28.8 to 34.6 GPa, the flexure strength ranges
Rujie He, Li Jing, Zhaoliang Qu, Zhili Zhou, Shigang Ai, Wei Kai   +5 more
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