서로 다른 입자크기의 ZrC가 첨가된 W-ZrC 복합체의 미세구조 및 고온강도에 관한 연구
Microstructure and Elevated Temperature Strength of W-ZrC Composites with Micrometric and Nanosized ZrC Particles
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W-10vol.%ZrC composites reinforced by micrometric and nanosized ZrC particles were prepared by hotpressingof 25 MPa for 2 h at 1900°C. The effect of ZrC particle size on microstructure and mechanical properties atroom temperature and elevated temperatures was investigated by X-ray diffraction analysis, scanning electron microscopeand transmission electron microscope observations and the flexural strength test of the W-ZrC composite. Microstructuralanalysis of the W-ZrC composite revealed that nanosized ZrC particles were homogeneously dispersed in theW matrix inhibiting W grain growth compared to W specimen with micrometric ZrC particle. As a result, its flexuralstrength was significantly improved. The flexural strength at room temperature for W-ZrC composite using nanosizedZrC particle being 740 MPa increased by around 2 times than that of specimen using micrometric ZrC particle whichwas 377 MPa. The maximum strength of 935 MPa was tested at 1200°C on the W composite specimen containing nanosizedZrC particle.
Abstract
W-10vol.%ZrC composites reinforced by micrometric and nanosized ZrC particles were prepared by hotpressingof 25 MPa for 2 h at 1900°C. The effect of ZrC particle size on microstructure and mechanical properties atroom temperature and elevated temperatures was investigated by X-ray diffraction analysis, scanning electron microscopeand transmission electron microscope observations and the flexural strength test of the W-ZrC composite. Microstructuralanalysis of the W-ZrC composite revealed that nanosized ZrC particles were homogeneously dispersed in theW matrix inhibiting W grain growth compared to W specimen with micrometric ZrC particle. As a result, its flexuralstrength was significantly improved. The flexural strength at room temperature for W-ZrC composite using nanosizedZrC particle being 740 MPa increased by around 2 times than that of specimen using micrometric ZrC particle whichwas 377 MPa. The maximum strength of 935 MPa was tested at 1200°C on the W composite specimen containing nanosizedZrC particle.
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