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In situ SHS-pseudo-HIP as an effective method to develop neutron shielding ceramic matrix composites from quaternary Ti-B-Cr-C system

Published online by Cambridge University Press:  04 July 2016

Marta Ziemnicka-Sylwester ,
Przemyslaw Litwa  and
Tomasz Czujko
Marta Ziemnicka-Sylwester
Affiliation:
Hokkaido University, Division of Materials Science and Engineering, Kita 13, Nishi 8, 060-8628Sapporo, JAPAN
Przemyslaw Litwa
Affiliation:
Military University of Technology, Department of Advanced Materials and Technologies, Gen. S. Kaliskiego 2, 00-908Warsaw, POLAND
Tomasz Czujko
Affiliation:
Military University of Technology, Department of Advanced Materials and Technologies, Gen. S. Kaliskiego 2, 00-908Warsaw, POLAND
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Abstract

Highly refractory composites with predominant volume fraction of TiB2, were “in situ” synthesized and consolidated. The production process was carried out using elemental powders by means of self-propagating high-temperature synthesis under pseudo-hot isostatic pressure (SHS-pseudo-HIP). The Ti:B atomic ratio corresponded to TiB2 formation, and Cr:C atomic ratio has been established in (3:2) molar ratio.

Based on scanning electron images (SEI), very high relative density was obtained with nearly full densification in composite with intended 85vol.% of TiB2, which is sufficiently high concentration of boron from the perspective of neutron shielding. However XRD results indicated formation of CrB and TiC, next to TiB2. This clearly indicates no equilibrium in pseudo-binary TiB2-Cr3C2 system. Besides, broadened peaks in XRD patterns as well as gradient of composition in EDS maps may indicate solid solutions, especially (Ti,Cr)C. The existence of (Ti,Cr) solid solutions and ternary compounds is possible, considering Hume-Rothery rules for hypothetical mutual solubility.

Keywords

Hot Isostatic Pressing (HIP)Combustion Synthesis (SHS)Densification
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1820: Symposium 6D – Innovative production and application of structural and functional ceramic- and metal-matrix composites , 2016 , imrc2015s6d-0001
Copyright
Copyright © Materials Research Society 2016 

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