한국재료학회지 제28권 제11호 (p.653-658)

W-1.5 ZrO2 복합재료 합성과 급속소결

Synthesis and Rapid Consolidation of W-1.5 ZrO2 Composite
키워드 :
sintering,composite materials,nanomaterials,mechanical properties,synthesis

목차

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 고찰
  3.1 나노분말 합성
  3.2 나노분말 소결
  3.3 기계적 특성
4. 결 론
References

초록

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 1300oC 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.