TY - JOUR
T1 - Enhancing stability of Co gradient in nano-structured WC-Co functionally graded composites using graphene additives
AU - Nasser, Ali
AU - Shinagawa, Kazunari
AU - El-Hofy, Hassan
AU - Moneim, Ahmed A.
N1 - Funding Information:
Publication of this international collaborative article is supported by JSPS Grants-in-Aid for Scientific Research (KAKENHI), Grant Number 252016 The authors would like to acknowledge Dr. Ayman El-said from The Central Metallurgical RandD Institute in Egypt for his efforts regarding the hot isostatic pressing. Kagawa University in Japan is also acknowledged for supporting the characterization work of this study. The financial support of the Egyptian Ministry of Higher Education through Egypt-Japan University of Science and Technology (E-JUST) is highly appreciated.
Publisher Copyright:
©2016 The Ceramic Society of Japan. All rights reserved.
PY - 2016/12
Y1 - 2016/12
N2 - A new approach for stabilizing a predesigned Co gradient in the microstructure of nano WC-Co thinning structure via graphene additions is presented. For this purpose, laminated specimens of green WC-Co functionally graded material, having three layers structured, with and without graphene additions in the intermediate layer were sintered at solid and liquid sintering temperatures of 1290 and 1400°C, respectively, using the hot isostatic pressing technique (HIP). With graphene additions, the mean average grain size of WC matrix phase is reduced, a new inter-phase layer is created and the amplitude of predesigned Co gradient, which had lost during liquid phase sintering of graphene-free WC-Co composite, is maintained through the cross section of the predesigned structure. As a consequence, the liquid state sintered specimens containing graphene show better hardness to toughness relationships compared to the graphene-free specimens fabricated under the same processing conditions. Such improvements are attributed to the extraordinary thermo-mechanical properties of graphene, and its beneficial role in grain refinement and creation of inter-phase layer that enables the stabilization of the predesigned Co-gradient.
AB - A new approach for stabilizing a predesigned Co gradient in the microstructure of nano WC-Co thinning structure via graphene additions is presented. For this purpose, laminated specimens of green WC-Co functionally graded material, having three layers structured, with and without graphene additions in the intermediate layer were sintered at solid and liquid sintering temperatures of 1290 and 1400°C, respectively, using the hot isostatic pressing technique (HIP). With graphene additions, the mean average grain size of WC matrix phase is reduced, a new inter-phase layer is created and the amplitude of predesigned Co gradient, which had lost during liquid phase sintering of graphene-free WC-Co composite, is maintained through the cross section of the predesigned structure. As a consequence, the liquid state sintered specimens containing graphene show better hardness to toughness relationships compared to the graphene-free specimens fabricated under the same processing conditions. Such improvements are attributed to the extraordinary thermo-mechanical properties of graphene, and its beneficial role in grain refinement and creation of inter-phase layer that enables the stabilization of the predesigned Co-gradient.
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U2 - 10.2109/jcersj2.16148
DO - 10.2109/jcersj2.16148
M3 - Article
AN - SCOPUS:85001086157
SN - 1882-0743
VL - 124
SP - 1191
EP - 1198
JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
JF - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
IS - 12
ER -