TiO2-particles containing Co grains are fabricated via thermal hydrogenation and selective oxidation of Ti- Co alloy. For comparison, TiO2-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℃ 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.

Abstract
1. 서 론
2. 실험방법
    2.1 분말의 제조 및 소결
    2.2 기계적 특성
3. 결과 및 고찰
    3.1 TiO2-Co 분말합성
    3.2 SPS소결 및 기계적 성질
4. 결 론
References

• 고명선(전북대학교 신소재공학부) | Myeongsun Ko (Division of Advanced Materials Engineering and Research Center for Advanced Materials Development, College of Engineering, Chonbuk National University)
• 박일송(전북대학교 신소재공학부) | Ilsong Park (Division of Advanced Materials Engineering and Research Center for Advanced Materials Development, College of Engineering, Chonbuk National University) Corresponding Author
• 박제신(전북대학교 신소재공학부) | Jeshin Park (Division of Advanced Materials Engineering and Research Center for Advanced Materials Development, College of Engineering, Chonbuk National University) Corresponding Author