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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.28 No.11 pp.653-658

Synthesis and Rapid Consolidation of W-1.5 ZrO2 Composite

Seong-Eun Kim, In-Jin Shon
Division of Advanced Materials Engineering, the Research Center of Hydrogen Fuel Cell, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea
Corresponding author
E-Mail : (I.-J. Shon, Chonbuk Nat'l Univ.)


ZrO2 is a candidate material for hip and knee joint replacements because of its excellent combination of biocompatibility, corrosion resistance and low density. However, the drawback of pure ZrO2 is a low fracture toughness at room temperature. One of the most obvious tactics to cope with this problem is to fabricate a nanostructured composite material. Nanomaterials can be produced with improved mechanical properties(hardness and fracture toughness). The high-frequency induction heated sintering method takes advantage of simultaneously applying induced current and mechanical pressure during sintering. As a result, nanostructured materials can be achieved within very short time. In this study, W and ZrO2 nanopowders are mechanochemically synthesized from WO3 and Zr powders according to the reaction(WO3 + 3/2 Zr→W+ 3/2 ZrO2). The milled powders are then sintered using high-frequency induction heating within two minutes under the uniaxial pressure of 80MPa. The average fracture toughness and hardness of the nanostructured W-3/2 ZrO2 composite sintered at 1300℃ are 540 kg/mm2 and 5 MPa·m1/2, respectively. The fracture toughness of the composite is higher than that of monolithic ZrO2. The phase and microstructure of the composite is also investigated by XRD and FE-SEM.

W-1.5 ZrO2 복합재료 합성과 급속소결

김성은, 손인진
전북대학교 신소재공학부 수소연료전지 연구센터