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자료유형
학술저널
저자정보
저널정보
한국해양공학회 한국해양공학회지 한국해양공학회지 제16권 제6호
발행연도
2002.12
수록면
60 - 64 (5page)

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This paper describes the machining characteristics of the MoSi₂-based composites through the process of electric discharge drilling with various tubular electrodes. In addition to hardness characteristics, microstructures of Nb/MoSi₂ laminate composites were evaluated from the variation of fabricating conditions, such as preparation temperature, applied pressure, and pressure holding time. MoSi₂-based composites have been developed in new materials for jet engines of supersonic-speed airplanes and gas turbines for high-temperature generators. These high performance engines may require new hard materials with high strength and high temperature-resistance. Also, with the exception of grinding, traditional machining methods are not applicable to these new materials. Electric discharge machining (EDM) is a thermal process that utilizes a spark discharge to melt a conductive material. The tool electrode is almost non-unloaded, because there is no direct contact between the tool electrode and the work piece. By combining a non-conducting ceramic with more conducting ceramic, it was possible to raise the electrical conductivity. From experimental results, it was found that the lamination from Nb sheet and MoSi₂ powder was an excellent strategy to improve hardness characteristics of monolithic MoSi₂. However, interfacial reaction products, like (Nb, Mo)SiO₂ and Nb₂Si₃ formed at the interface of Nb/MoSi₂, and increased with fabricating temperature. MoSi₂ composites, with which a hole drilling was not possible through the conventional machining process, enhanced the capacity of ED-drilling by adding NbSi₂, relative to that of SiC or ZrO₂ reinforcements.

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