Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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The Microstructure and the Mechanical Properties of Sintered TiO2-Co Composite Prepared Via Thermal Hydrogenation Method

열 수소화법에 의해 제조된 TiO2-Co 복합분말 SPS 소결체의 미세구조 및 기계적 성질

  • Ko, Myeongsun (Division of Advanced Materials Engineering and Research Center for Advanced Materials Development, College of Engineering, Chonbuk National University) ;
  • Park, Ilsong (Division of Advanced Materials Engineering and Research Center for Advanced Materials Development, College of Engineering, Chonbuk National University) ;
  • Park, Jeshin (Division of Advanced Materials Engineering and Research Center for Advanced Materials Development, College of Engineering, Chonbuk National University)
  • 고명선 (전북대학교 신소재공학부) ;
  • 박일송 (전북대학교 신소재공학부) ;
  • 박제신 (전북대학교 신소재공학부)
  • Received : 2019.07.08
  • Accepted : 2019.08.20
  • Published : 2019.08.28
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Abstract

$TiO_2$-particles containing Co grains are fabricated via thermal hydrogenation and selective oxidation of TiCo alloy. For comparison, $TiO_2$-Co composite powders are prepared by two kinds of methods which were the mechanical carbonization and oxidation process, and the conventional mixing process. The microstructural characteristics of the prepared composites are analyzed by X-ray diffraction, field-emission scattering electron microscopy, and transmission electron microscopy. In addition, the composite powders are sintered at $800^{\circ}C$ by spark plasma sintering. The flexural strength and fracture toughness of the sintered samples prepared by thermal hydrogenation and mechanical carbonization are found to be higher than those of the samples prepared by the conventional mixing process. Moreover, the microstructures of sintered samples prepared by thermal hydrogenation and mechanical carbonization processes are found to be similar. The difference in the mechanical properties of sintered samples prepared by thermal hydrogenation and mechanical carbonization processes is attributed to the different sizes of metallic Co particles in the samples.

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References

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