• 한국자기학회:학술대회 개요집
• /
• 한국자기학회 1997년도 춘계연구발표회 논문개요집
• /
• pp.78-79
• /
• 1997

• 한국자기학회:학술대회 개요집
• /
• 한국자기학회 1997년도 추계연구발표회 논문개요집
• /
• pp.120-121
• /
• 1997

• 한국자기학회:학술대회 개요집
• /
• 한국자기학회 2002년도 춘계연구발표회 논문개요집
• /
• pp.90-91
• /
• 2002

• 한국재료학회:학술대회논문집
• /
• 한국재료학회 1996년도 재료학회 춘계학술발표회
• /
• pp.139-140
• /
• 1996

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2004년도 춘계학술대회 논문집
• /
• pp.17-22
• /
• 2004

폐 처리된 Ba, Sr 페라이트를 사용하여 GHz 대역용 전파흡수체를 개발하였다. 도전 손실재인 카본의 첨가에 따른 전파흡수능의 변화와 시편의 뚜께 그리고 시편 제작시 제작온도 변화에 따른 전파흡수능의 변화를 조사하였다. 이와 같은 실험을 통하여 CHz 대역용 Ba, Sr 페라이트 전파흡수체를 개발하는데 있어 카본의 첨가가 매우 유효함을 알았으며, 시편의 제작온도 또한 우수한 전파흡수체를 개발하는데 있어 반드시 고려되어야 함을 밝혔다. 이와 같은 실험을 실시하여 20dB 이상의 전파흡수체를 개발 할 수 있었다.

• 한국전기전자재료학회논문지
• /
• 제24권2호
• /
• pp.131-135
• /
• 2011

We have been studied the effects of oxidant on the properties of Sr-ferrite magnets using mill scale for motor. The small-added (0.5 wt%) $NaNO_3$ oxidant improved significantly the degree of oxidation and the grindability of mill scale, and then highly enhanced the magnetic properties of anisotropic Sr-ferrite sintered magnets; such as the remanent flux density from 3.55 to 3.80 kG, the intrinsic coercivity from 2.75 to 3.22 kOe, and the maximum energy product from 2.90 to 3.45 MGOe.

• 한국마린엔지니어링학회:학술대회논문집
• /
• 한국마린엔지니어링학회 2005년도 전기학술대회논문집
• /
• pp.423-428
• /
• 2005

We prepared paint-type and sheet-type EM wave absorbers with Mn-Zn Ferrite, Ni-Zn Ferrite, Ba Ferrite, Sr Ferrite, and Sendust against ghosts of a mater in ships. To prepare the absorbers, enamel paint and epoxy paint were used as binders. The prepared EM wave absorber's absorption properties were investigated. The prepared EM wave absorbers have 6 dB over in 2 GHz ${\sim}$ 4 GHz. We compared properties of wave absorption between paint-type and spray-type

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 1997년도 추계학술대회 논문집
• /
• pp.120-123
• /
• 1997

In this paper, we deal with the effect on magnetic properties when Nd is added to Sr ferrite bonded magnet. First, we choose SrO$_{n}$.Fe$_2$O$_3$(n=5.9), which is nonstoichiomatric composition, as specimen ferrite. Then, we add 5wt% polyvinyl alcohol and calcinate at 12$25^{\circ}C$ under $N_2$ environment for carbon coating on chemical compound specimen. After that we obtain 1.2${\mu}{\textrm}{m}$ single domain powder through grinding process for 18 hours. The single domain Sr ferrite Powder is well mixed with silage coupling and calcium stearate of 1wt% Then, it is kneaded by using polyamide12 as a binder and is pelleted. After adding Nd-Fe-B powder to the pelleted specimen, we injection-mould it under magnetic field by using anisotropic mould. Especially, when we add l3wt% Nd-Fe-B powder to the polyamide12, we obtain excellent magnetic propertiecs which are $_{B}$H$_{C}$=2.65KOe, Br=3.16KG and (BH)$_{max}$=2.61MGOeOeOeOeOe

• 대한용접접합학회:학술대회논문집
• /
• 대한용접접합학회 2000년도 특별강연 및 추계학술발표대회 개요집
• /
• pp.240-242
• /
• 2000

This study was investigated absorption properties of electromagnetic wave in thermal sprayed Sr-ferrite coatings. The experiment of this study was ; manufactured thermal spraying powder for improving absorption-efficiency, processed for increasing strength of thermal spray coatings, and measured the electromagnetic wave shielding efficiency. This study was obtained excellent absorption-efficiency by thermal sprayed Sr-ferrite coatings.

• Journal of electromagnetic engineering and science
• /
• 제5권4호
• /
• pp.161-165
• /
• 2005

We prepared Mn-Zn ferrite Electromagnetic(EM) wave absorbers. The Mn-Zn ferrite EM wave absorbers were coated with Sr ferrite powders and $Al(OH)_3$ powders. The coated Mn-Zn ferrite EM wave absorbers show improved absorption compared with non-coated Mn-Zn EM wave absorbers.