MoSi_2 복합재료의 굽힘강도 특성
Flexural strength properties of MoSi_2 based composites
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The flexural strength of MoSi_2 based composites reinforced with Nb sheets has been investigated, based on the detailed examination of their microstructure and fractured surface. Both sintered density and porosity of Nb/MoSi_2 composites were also examined. Nb/MoSi_2 composites were fabricated by different conditions such as temperature, applied pressure and its holding time, using a hot-press device. The volume fraction of Nb sheet in this composite system was fixed as 10%. The characterization of Nb/MoSi_2 composites were investigated by means of optical microscopy, scanning electron microscope and three point bending test. Nb/MoSi_2 composites represented a dense morphology at the interfacial region, accompanying the creation of two types of reaction layer by the chemical reaction of Nb and MoSi_2. Nb/MoSi_2 composites possessed an excellent density at the fabricating temperature of 1350℃, corresponded to about 95% of theoretical density. The flexural strength of Nb/MoSi_2composites were greatly affected by the pressure holding time at the same fabricating temperature, owing to the large suppression of porosity in the microstructure. Especially, Nb/MoSi_2 composites represented a good flexural strength of about 310 MPa at the fabricating condition of 1350℃,30MPa and 60min, accompanying the pseudo-ductile fracture behavior by the deformation of Nb sheet and the interfacial delamination.
Abstract
The flexural strength of MoSi_2 based composites reinforced with Nb sheets has been investigated, based on the detailed examination of their microstructure and fractured surface. Both sintered density and porosity of Nb/MoSi_2 composites were also examined. Nb/MoSi_2 composites were fabricated by different conditions such as temperature, applied pressure and its holding time, using a hot-press device. The volume fraction of Nb sheet in this composite system was fixed as 10%. The characterization of Nb/MoSi_2 composites were investigated by means of optical microscopy, scanning electron microscope and three point bending test. Nb/MoSi_2 composites represented a dense morphology at the interfacial region, accompanying the creation of two types of reaction layer by the chemical reaction of Nb and MoSi_2. Nb/MoSi_2 composites possessed an excellent density at the fabricating temperature of 1350℃, corresponded to about 95% of theoretical density. The flexural strength of Nb/MoSi_2composites were greatly affected by the pressure holding time at the same fabricating temperature, owing to the large suppression of porosity in the microstructure. Especially, Nb/MoSi_2 composites represented a good flexural strength of about 310 MPa at the fabricating condition of 1350℃,30MPa and 60min, accompanying the pseudo-ductile fracture behavior by the deformation of Nb sheet and the interfacial delamination.
참고문헌 (13)
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