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오스테나이트 침질탄화 처리한 고탄소 크롬 베어링강의 표면층 분석
김창석,진재관,김동건 ( C . S . Kim,J . K . Jin,D . K . Kim ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.4
To investigate the characteristics of nitrocarburizing for high carbon chromium bearing steel, it was undertaken 4 hours holding at 850℃ in the atmosphere containing 60% endothermic gas and 40% ammonia. The microstructure of nitrocarburized surface consists of ε-Fe_(2-3)N, γ`-Fe₄N, Fe₃C and Fe₃(C,N), and the ε-nitride was rich in the surface-internal part. The nitrocarburized surface contains a larger volume fraction of primary carbonitrides and has more retained austenite and is slightly harder than the interior.
고특성 Nd₁₂Fe80B6(Nb, M) (M=Ti / Cu / Ga)급속응고리본의 자기특성
김윤배(Y. B. Kim),김창석(C. S. Kim),김동환(D. H. Kim),이갑호(K. H. Lee),김택기(T. K. Kim) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.1
Magnetic properties and microstructures of Nd₁₂Fe_(80)B_6(Nb, M) (M=Ti/Cu/Ga) melt-spun ribbons prepared by single wheel technique have been studied. The results of microstructural study have shown that Ga is effective for the orientation of c-axis normal to the ribbon plane. The Ga-added melt-spun ribbon, Nd₁₂Fe_(80)B_6(Nb, Ga), quenched at Vs=17.9 ㎧ was mostly composed of fine grains of about 30 ㎚ in size with the textured free-side surface. The powder of this ribbon aligned in magnetic field showd a high remanence of 0.87 T which was about 5% higher than that of ribbon itself. It is believed that there is a possibility to fabricate a new type of HIREM melt-spun ribbon with highly textured free-side surface.
(Sm0.5RE0.5)Fe₁₁ Ti 화합물의 구조 및 자기특성
김희태(H.T.Kim),김윤배(Y.B.Kim),김창석(C.S. Kim),김택기(T.K. Kim),권혁무(H.M. Kwon) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.3
(Sm_(0.5)RE_(0.5))Fe₁₁ Ti compounds have tetragonal ThMn₁₂-type structure and show the uniaxial magnetocrystalline anisotropy with the easy magnetization c-axis. Among the (Sm_(0.5)RE_(0.5)Fe₁₁Ti series, RE=Sm shows the highest anisotropy field of 11200 ㎄ / m(140 kOe). On the other hand, RE=Nd has the highest saturation magnetization of 122.3 Am² / ㎏ (122.3 emu / g) and RE=Gd the highest Curie temperature of 326 ℃.
NdFe10.7TiM0.3(M = B, Ti)의 Mossbauer 연구
김철성(Chul Sung Kim),이용종(Young Jong Lee),김윤배(Y. B. Kim),김창석(C. S. Kim) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
The authors have studied crystallographic and magnetic properties of NdFe_(10.7)TiM_(0.3)(M = B, Ti) by X-ray diffraction, VSM magnetometer, and Mossbauer spectrometer. The Alloys were prepared by arc-melting under argon atmosphere. The NdFe_(10.7)TiM_(0.3) has pure single phase, whereas the NdFe_(10.7)TiM_(0.3) contains some α-Fe, from powder X-ray diffractometry. The NdFe_(10.7)TiM_(0.3) has the ThMn₁₂-type tetragonal structure with α_0=8.587 A and C_0= 4.788 Å. The Curie temperature (Tc) is 570 ± 3 K from Mossbauer spectroscopy performed at various temperatures ranging from 13 to 770 K. Each spectrum of below Tc was fitted with five subspectra of Fe sites in the structure (8i₁,8i₂, 8j₁, 8j₂ and 8f). The area fraction of the subspectra at room temperature are 16.4, 8.2, 14.8, 21.3 and 39.3 %, respectively. Magenetic hyperfine fields for the Fe sites decrease in the order, Hhf(8i)>Hhf(8f)>Hhf(8f).
ThMn₁₂형 NdFe10.7Ti1.2Mo0.1의 미세구조 및 자기적 성질 연구
안성용(Sung Yong An),이승화(Seung Wha Lee),김철성(Chul Sung Kim),김윤배(Y. B. Kim),김창석(C. S. Kim) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.2
We have studied crystallographic and magnetic properties of NdFe_(10.7)Ti_(1.2)Mo_(0.1) by Mossbauer spectroscopy, X-ray diffraction and vibrating sample magnetometer(VSM). The alloys were prepared by arc-melting under an argon atmosphere. The NdFe_(10.7)Ti_(1.2)Mo_(0.1) has pure a single phase, whereas NdFe_(10.7)Ti_(1.3) contains some α-Fe, conformed with X-ray diffractometry and Mossbauer measurements. The NdFe_(10.7)Ti_(1.2)Mo_(0.1) has a ThMn₁₂-type tetragonal structure with a_0=8.637Å and c_0=4.807Å. The Curie temperature (Tc) is 600 K from the result of Mossbauer measurement performed at various temperatures ranging from 13 to 800 K. Each spectrum of below Tc is fitted with five subspectra of Fe sites in the structure (8i₁, 8i₂, 8j₂, 8j₁, 8f). The area fractions of the subspectra at room temperature are 12.3%, 14.0%, 21.0%, 11.8%, 40.9%, respectively. Magnetic hyperfine fields for the Fe sites decrease in the order, Hhf(8i)>Hhf(8j)>Hhf(8f). The abrupt changes in the magnetic hyperfine field, an magnetic moment observed at about 160 K in NdFe_(10.7)Ti_(1.2)Mo_(0.1) are attributed to spin reorientations. The average hyperfine field of the NdFe_(10.7)Ti_(1.2)Mo_(0.1) shows a temperature dependence of [Hhf(T)-Hhf(0)]/Hhf(0) = -0.34(T/Tc)((3/2)-0.14(T/Tc)^(5/2) for T/Tc<0.7, indicative of spin wave excitation. The Debye temperatures of NdFe_(10.7)Ti_(1.2)Mo_(0.1) is found to be Θ = 340±5 K.
NdFe10.7Ti1.3의 결정학적 및 자기적 성질 연구
이승화(Seung Wha Lee),이용종(Young Jong Lee),안성용(Sung Yong An),김철성(Chul Sung Kim),김윤배(Y. B. Kim),김창석(C. S. Kim) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.6
NdFe_(10.7)Ti_(1.3) has been studied with X-ray diffraction, Mossbauer spectroscopy and vibrating sample magnetometer(VSM). The alloys were prepared by arc-melting under an argon atmosphere. The NdFe_(10.7)Ti_(1.3) contains some α-Fe, from X-ray and Mossbauer measurements. The NdFe_(10.7)Ti_(1.3) has the ThMn₁₂-type tetragonal structure with α_0=8.607 Å and c_0=4.790 Å. The Curie temperature(Tc) of the NdFe_(10.7)Ti_(1.3) is 590 K from Mossbauer spectroscopy performed at various temperatures ranging from 13 to 800 K. Each spectrum below Tc was fitted with six subspectra of Fe sites in the structure(8i₁, 8i₂, 8j₂, 8j₁, 8f and α-Fe). The area fractions of the subspectra at room temperature are 13.8 %, 15.4 %, 17 %, 16.4 %, 34.1 % and 3.3 %, respectively. Magenetic hyperfine fields for the Fe sites decrease in the order, Hhf(8i)>Hhf(8j)>Hhf(8f). The abrupt changes in the magnetic hyperfine field, isomer shift and magnetic moment observed at about 180 K in NdFe_(10.7)Ti_(1.3) are attributed to spin reorientation.