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배인성,전우용,전인권,설경원,우기도 ( I . S . Bae,W . Y . Jeon,I . K . Kim,K . W . Seol,K . D . Woo ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.1
Although functionally gradient materials(FGM) has been developed so as to decrese the thermal stress induced by the high temperature difference between metal and ceramic, it is necessary to analyze the residual thermal stress for the fabrication of FGM. In order to reduce the residual thermal stress, compositional profile of SUS/PSZ(FGM) was suggested using finite element method(FEM). The stress analysis was made on the shape of cylinder with axial symmetry using two dimensional triangular element. For the case of various cylinder with different compositional gradient, calculated stress components were in reasonably good agreement with the expected ones. And the qualitative profile was suggested.
급냉응고된 분말로부터 CAPA법으로 제조한 NdFeB 영구자석의 자기적 특성
김형태(H. T. Kim),김윤배(Y. B. Kim),전우용(W. Y. Jeon),김학신(H. S. Kim) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.6
Magnetic properties of the isotropic and anisotropic NdFeB magnets obtained by the Current-Applied Pressure-Assisted (CAPA) process from a melt-spun NdFeB powder were investigated using B-H loop analyser. The coercivity of the isotropic magnets is sensitive to the applied pressure in the CA-pressing and increases with increasing the pressure. The remanence of the anisotropic magnet increases with increasing the degree of deformation, and it results in the increase of a maximum energy product. The best magnetic properties of the isotropic and antistropic magnet are Br=8.7 kG, iHc= 16.9 kOe, (BH)max = 16.5 and Br=13.6 kG, iHc =10.9 kOe, (BH)max = 44.2 MGOe, respectively.