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Si 결합 다공성 탄화규소의 미세구조 및 통기도 특성 -카본 함량 변화 중심
송인혁,박미정,김해두,김영욱,배지수,Song, In-Hyuck,Park, Mi-Jung,Kim, Hai-Doo,Kim, Young-Wook,Bae, Ji-Soo 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.6
The achievement of high gas permeability is a key factor in the development of porous SiC ceramics for applications of hot gas filter, vacuum chuck, and air spindle. However, few reports on the gas permeability of porous SiC ceramics can be found in the literature. In this paper, porous SiC ceramics were fabricated at temperatures ranging from $1600^{\circ}C$ to $1800^{\circ}C$ using the mixing powders of SiC, silicon, carbon and boron as starting materials. In some samples, expanded hollow microspheres as a pore former were used to make a cellular pore structure. It was possible to produce Si bonded SiC ceramics with porosities ranging from 42% to 55%. The maximum bending strength was 58MPa for the carbon content of 0.2 wt% and sintering temperature of $1700^{\circ}C$. The increase of air permeability was accelerated by addition of hollow microsphere as a pore former.
프릿을 이용한 다공질 SiC 세라믹스의 저온 제조 공정 및 물성
채수호,김영욱,송인혁,김해두,배지수,나상문,김승일,Chae, Su-Ho,Kim, Young-Wook,Song, In-Hyuck,Kim, Hai-Doo,Bae, Ji-Soo,Na, Sang-Moon,Kim, Seung-Il 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.5
Porous frit-bonded SiC ceramics were successfully prepared at a temperature as low as $800^{\circ}C$ from SiC, frit, and microbeads (glass or polymer). The effects of SiC starting particle size and microbead addition on microstructure, porosity, and flexural strength were investigated. The addition of hollow glass microbead improved the strength of frit-bonded SiC ceramics without the loss of porosity by acting additional binder phase between SiC grains. The 65 ${\mu}m$-sized SiC resulted in lower porosity and higher strength than 50 ${\mu}m$-sized SiC because of higher packing density. Typical flexural strengths of frit-bonded SiC were 23 MPa at 46% porosity and 19 MPa at 49% porosity.
중공형 미세구를 이용한 마이크로셀룰라 지르코니아의 가공 특성 고찰
이은정,송인혁,김해두,김영욱,배지수,Lee, Eun-Jung,Song, In-Hyuek,Kim, Hai-Doo,Kim, Young-Wook,Bae, Ji-Soo 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.1
In this study, a novel-processing route for producing microcellular zirconia ceramics has been developed. The proposed strategy for making the microcellular zirconia ceramics involves hollow microsphere as a pore former which has extremely low density of $0.025\;g/cm^3$. Effects of hollow microsphere content and sintering temperature on microstructure, porosity, pore distribution, and compressive strength were investigated in the processing of microcellular zirconia ceramics. By controlling the content of hollow microsphere, it was possible to make the porous zirconia ceramics with porosities ranging from 45% to 75%. Typical compressive strength value of microcellular zirconia ceramics with ${\sim}65%$ porosity was over 50 MPa. By adjusting the mixing ratio of large and small zirconia powders, it was possible to control the pore structure from close to open pores.
Frit 함량이 다공질 Frit-Bonded 알루미나 세라믹스의 미세조직과 꺾임강도에 미치는 영향
임광영,김영욱,송인혁,김해두,배지수,Lim, Kwang-Young,Kim, Young-Wook,Song, In-Hyuck,Kim, Hai-Doo,Bae, Ji-Soo 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.6
Porous frit-bonded alumina ceramics were fabricated using alumina and frit as raw materials. The effects of frit content and sintering temperature on microstructure, porosity, and flexural strength were investigated at low temperature of $750{\sim}850^{\circ}C$. Increased addition of frit content or higher sintering temperature resulted in improved flexural strength of porous frit-bonded alumina ceramics. It was possible to produce frit-bonded alumina ceramics with porosities ranging from 35% to 40%. A maximum strength of 52MPa was obtained at a porosity of ~38% when 90 wt% alumina and 10 wt% frit powders were used.
기공형성제 크기와 함량이 다공질 지르코니아 세라믹스의 가공율과 강도에 미치는 영향
채수호,김영욱,송인혁,김해두,배지수,Chae, Su-Ho,Kim, Young-Wook,Song, In-Hyuek,Kim, Hai-Doo,Bae, Ji-Soo 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.1
Using zirconia and poly (methyl methacrylate-coethylene glycol dimethacrylate) (PMMA) microbeads, macroporous zirconia ceramics were fabricated by a simple pressing method. Effects of template size and content on microstructure, porosity, and flexural and compressive strengths were investigated in the processing of the macroporous zirconia ceramics. Three different sizes of microbeads (8, 20, and $50{\mu}m$) were used as a template for fabricating the macroporous ceramics. The porosity increased with increasing the template size at the same template content. The flexural and compressive strengths were primarily influenced by the porosity rather than the template size. However, the strengths increased with decreasing the template size at the same porosity. By controlling the template size and content, it was possible to produce macroporous zirconia ceramics with porosities ranging from 58% to 75%. Typical flexural and compressive strength values at 60% porosity were ${\sim}30\;MPa$ and ${\sim}75\;MPa$, respectively.
김준회(Jun-Hoe Kim),이정수(Jeong-Soo Lee),주정우(Jeong-Woo Joo),배지수(Ji-Su Bae),이붕주(Boong-Joo Lee) 한국전자통신학회 2018 한국전자통신학회 논문지 Vol.13 No.4
본 논문은 스마트 베개와 스마트 기저귀에 관한 것이다. 스마트 베개는 아기 울음소리의 주파수를 분석하여 나온 디지털 값을 대역 통과 필터에 적용한다. 만약 300-600Hz 사이라면 백색 소음을 출력한다. 스마트 기저귀는 아기가 배변 시 기저귀 외부의 온도가 29℃이상, 습도가 99% 이상일 경우에 스마트폰에 경고 알람을 울린다. 또한 스마트 기저귀는 아기가 누워있는 위치를 감지하여 뒤집혔을 시 스마트폰에 경고 알람을 울려 아기의 질식사를 예방한다. This paper is about a smart pillow, and a smart diaper. The smart pillow analyzes the frequency of a baby’s cry and applies its digital value to the band pass filter. If the crying is between 300-600Hz, the white noise comes out. The smart diaper alerts to the smart phone if the humidity outside the diaper is over 99%, or the temperature is over 29℃ after the defecation of the baby. The smart diaper also prevents choking of the baby by alert to smart phone if they are in a dangerous position by sensing the location of the infant.
채수호,엄정혜,김영욱,송인혁,김해두,배지수,나상문,김승일,Chae, Su-Ho,Eom, Jung-Hye,Kim, Young-Wook,Song, In-Hyuek,Kim, Hai-Doo,Bae, Ji-Soo,Na, Sang-Moon,Kim, Seung-Il 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.1
A simple pressing process using zirconia and microbead for fabricating porous zirconia ceramics is demonstrated. Effects of microbead content and sintering temperature on microstructure, porosity, compressive and flexural strengths were investigated in the processing of porous zirconia ceramics using microbead as a pore former. By controlling the microbead content and the sintering temperature, it was possible to produce porous zirconia ceramics with porosities ranging from 43% to 70%. Typical compressive and flexural strength values at ${\sim}50%$ porosity were ${\sim}150\;MPa$ and ${\sim}35\;MPa$, respectively.
하이브리드 전도성 Filler 섬유강화 복합재료의 전자파 차폐효과
한길영(Gil-Young Han),송동한(Dong-Han Song),배지수(Ji-Soo Bae) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.3
The main objective of this study was to investigate fiber reinforced composite materials (FRCM) with electromagnetic shielding characteristics using aluminum (Al) film and copper (Cu) meshes. This study investigated the electromagnetic interference (EMI) shielding effectiveness (SE) of fiber reinforced composites filled with Al film, Cu meshes, and nano carbon black as hybrid conductive fillers to provide the electromagnetic shielding property of the fiber reinforced composites. The coaxial transmission line method of ASTM D 4935-89 was used to measure the EMI shielding effectiveness of composites in the frequency range of 300 ㎒ to 1.5 ㎓. The variations of SE of FRCM with Al film fine Cu, and general Cu meshes are described. The results indicate that the FRCM having Al film exhibited up to 75 ㏈ of SE at 1.5 ㎓.
금속메쉬, 알루미늄필름/섬유강화 복합재료의 전자파 차폐 효과에 관한 연구
한길영 ( Gil Yung Han ),송동한 ( Dong Han Song ),배지수 ( Ji Soo Bae ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.2
In this study, electromagnetic interference(EMI) shielding effectiveness(SE) of fiber reinforced composites(FRC) filled with aluminum(Al) film, copper(Cu) meshes and carbon black as hybrid conductive filler have been studied. Al film and Cu meshes are incorporated as conductive fillers to provide the electromagnetic shielding property of the FRC. The coaxial transmission line method of ASTM D4935-89 was used to measure the EMI shielding effectiveness of composites in frequency range 300 MHz to 1.5 GHz. The variations of SE of FRC with Ai film, fine Cu and general Cu meshes are described. The result indicate that the fiber reinforced Cu meshes are described. The result indicate that the fiber reinforced composites using Al film tiller was shown th exhibit up to 55-75 of SE.