http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ni0.5Cu0.1Zn0.4Fe₂O₄ Ferrite - Rubber Composite의 전파흡수특성에 미치는 열처리 온도의 영향 및 Carbon 첨가효과
윤국태(Kuk-Tae Youn),이찬규(Chan-Gyu Lee),박연준(Youn-Joon Park) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.1
The structure, shape, size, and magnetic properties of Ni_(0.5)Cu_(0.1)Zn_(0.4)Fe₂O₄ have been investigated as a function of annealing temperatures. In order to control the microwave absorbing properties of ferrite-rubber composite and the complex losses (magnetic loss and conduction loss), the effect of carbon addition was also studied. It was found that the coercive force decreased with increasing heat-treatment temperatures. Relative complex permeability and reflection loss were measured by the network analyzer. As a result, the natural resonance occurred in the low frequency range, and the matching frequency of the ferrite-rubber composite prepared at 1300℃ was found to be lower. As heat-treatment temperatures were increased, the magnetic loss (μr/μr') and the dielectric loss (εr/εr') were increased. It was caused that the absorption characteristics of the absorber were improved. The conduction loss and magnetic loss were expected to be occurred together because two matching frequencies were shown with carbon addition. It was confirmed that the matching frequency of the microwave absorber could be controlled by controlling heat-treatment temperatures and carbon additions.
탄소나노튜브 강화 SKD11 냉간금형용 하이브리드 탄소나노소결체 제조 및 특성 평가
정성실,문제세,이대열,윤국태,박춘달,송재선,Jung, Sung-Sil,Moon, Je-Se,Lee, Dae-Yeol,Youn, Kuk-Tae,Park, Chun-Dal,Song, Jae-Sun 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.4
SKD11 (ASTM D2) tool steel is a versatile high-carbon, high-chromium, air-hardening tool steel that is characterized by a relatively high attainable hardness and numerous, large, chromium rich alloy carbide in the microstructure. SKD11 tool steel provides an effective combination of wear resistance and toughness, tool performance, price, and a wide variety of product forms. The CNTs was good additives to improve the mechanical properties of metal. In this study, 1, 3 vol% CNTs was dispersed in SKD11 matrix by mechanical alloying. The SKD11+ CNT hybrid nanocomposites were investigated by FE-SEM, particle size distribution, hardness and wear resistance. The CNT was well dispersed in the SKD11 matrix and the mechanical properties of the composite were improved by CNTs addition. It shows good feasibility as cold work die tool.