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        • SCOPUSKCI등재

          알콕사이드로부터 $Al_2O_3-SiC$ 복합재료의 제조 및 특성 II. 피복형 $Al_2O_3-SiC$ 복합분말의 합성

          이홍림,김규영 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.3

          Coated type Al2O3-SiC composite powders were synthesized by surface modification method. Transformation temperature to $\alpha$-Al2O3 of Al2O3 monolith was 115$0^{\circ}C$ whereas increased to 1200, 1250, 130$0^{\circ}C$ with increment of SiC content to 5, 15, 25wt%. Transformation temperature to $\alpha$-Al2O3 was lowered by $\alpha$-Al2O3 seeding. FTIR data analysis and electron micrographs showed that Al2O3 particles were effectively coated on SiC particles.

        • SCOPUSKCI등재

          공침법으로 제조한 $ZrO_2$+3m/o $Y_2O_3$계 분체의 특성(II) : Y-TZP의 기계적 성질 및 미세구조에 미치는 $Al_2O3$와 $Cr_2O_3$의 첨가영향

          이홍림,최동근,홍기곤,신현곤 한국세라믹학회 1990 한국세라믹학회지 Vol.27 No.4

          The effects of Al2O3 and Cr2O3 addition on the mechanical properties and microstructures of Y-TZP ceramics obtained by co-precipitation method of ZrO2+3m/o Y2O3, following pressureless sintering at 150$0^{\circ}C$ for 2h were investigated. The addition of Al2O3 and Cr2O3 improved the Y-TZP sinterability and the Al2O3 addition showed the better effect on Y-TZP sintering than that of the Cr2O3 addition. The density and microstructure had the better effect on the bending strength of specimen more than stressinduced phase transformation (SIPT) of ZrO2 from tetragonal to monoclinic phase. The hardness of the specimens was found to be depend on the relative density and the fracture toughness of Y-TZP was found to rely on the amount of SIPT. The grian size of Cr2O3-doped Y-TZP was observed to be relatively smaller and had a narrower distribution than that of Al2O3-doped Y-TZP. If decomposition reaction of Cr2O3 can be controlled at high temperatures, it is anticipated that the mechanical properties of Y-TZP can be much improved by the Cr2O3 addition.

        • SCOPUSKCI등재

          알콕사이드로부터 Mullite분말의 합성 및 그 특성

          이홍림,함종근 한국세라믹학회 1989 한국세라믹학회지 Vol.26 No.6

          A very fine and pure mullite powder of the stoichiometric composition was prepared from aluminium isopropoxide and tetraethylorthosilicate by an alkoxide hydrolysis method using NH4OH as a catalytic agent. The gel powder obtained from the hydrolysis was calcined at 80$0^{\circ}C$ and 125$0^{\circ}C$. The average particle sizes of the powders calcined at 80$0^{\circ}C$ and 125$0^{\circ}C$ were 0.19${\mu}{\textrm}{m}$ and 0.25${\mu}{\textrm}{m}$, respectively. The specific surface areas of the powders calcined at 80$0^{\circ}C$ and 125$0^{\circ}C$ were 114.7$m^2$/g and 20.6$m^2$/g, respectively. The bending strength and fracture toughness of the mullite ceramics sintered at 1$650^{\circ}C$ were 263.1MPa and 2.30MPa.m1/2 respectively.

        • SCOPUSKCI등재

          알콕사이드로부터 AlN분말의 합성 및 분말 특성

          이홍림,박세민,조덕호 한국세라믹학회 1989 한국세라믹학회지 Vol.26 No.1

          Aluminum hydroxides were prepared by the alkoxide hydrolysis method using Al-isopropoxide as a starting material and NH4OH as a catalytic agent. When Al-isopropoxide was hydrolyzed in a H2O-NH3 system, only Al(OH)3 was obtained over all pH values. However, AlOOH was formed besides Al(OH)3 when Al-isopropoxide was hydrolyzed in a H2O-NH3-isopropyl alcohol system. The AlOOH/Al(OH)3 ratio was increased as the isopropyl alcohol content was increased. The hydroxides, Al(OH)3 and AlOOH, obtained in this study and the commerical products, $\alpha$-Al2O3 and AlOOH were subjected to the carbothermal reduction and nitridation reaction to product AlN powder, using carbon black as a reducing agent under N2 atmosphere at various temperatures. AlN was synthesized from the obtained Al(OH)3 and the commercial AlOOH at 145$0^{\circ}C$, however, synthesized from the obtained AlOOH and the commercial alpha-alumina at 135$0^{\circ}C$. The temperature difference is assumed to be attributed to the reactivity of those powders. AlN powder prepared from the Al-isopropoxide was observed to have the narrower particle size distribution than that prepared from the commercial $\alpha$-Al2O3 or AlOOH.

        • SCOPUSKCI등재

          완도납석으로부터 제조한 $\beta$-Sialon에 대한 SiC의 복합화 효과

          이홍림,김신,이형직,Lee, Hong-Lim,Kim, Shin,Lee, Hyung-Jik 한국세라믹학회 1988 한국세라믹학회지 Vol.25 No.3

          완도납석과 carbon black 의 혼합물을 135$0^{\circ}C$에서 질소분위기를 사용하여 탄소환원질화법으로 $\beta$-Sialon 분물에 $\beta$-SiC를 제2상으로 넣어서 $Y_2O_3$와 $ZrO_2$를 각 소결조제로 사용하여 175$0^{\circ}C$에서 2시간 동안 상압소결하였다. 10wt %의 $Y_2O_3$를 소결조제로 사용하였을 때에 파괴인성은 3.8MN/m^{3/2}$, 3점꺽임 강도는 470MN/$m^2$ 그리고 경도는 13.7MN/$m^2$로서 좋은 값을 나타내었다. 이와 같은 파괴인성과 꺽임강도의 증가는 균열편향과 균열나눠짐에 의한 것으로 생각된다. $\beta$-Sialon powder was prepared by the reduction-nitridation reaction from the mixture of Wando Pyrophyllite and carbon black at 135$0^{\circ}C$ in $N_2$ atmosphere. $\beta$-SiC powder was added to the prepared $\beta$-Sialon powder to make $\beta$-Sialon-SiC composite. The $\beta$-Sialon-SiC composites were sintered pressurelessly at 175$0^{\circ}C$ for 2h, using $Y_2O_3$ and $ZrO_2$(monoclinic) as sintering aids. Comparatively higher values of the fracture toughness (3.8 MN/㎥/2), M.O.R. (470 MN/$m^2$) and vickers microhardness (13.7 MN/$m^2$) were obtained when 10 wt% $Y_2O_3$ was added as a sintering aid. The improved fracture toughness and M.O.R. are assumed to be the results of crack deflection and crack branching by the second phase SiC particles.

        • KCI등재

          Al(OH)3-SiO2-AlF3 조성으로 합성된 뮬라이트 휘스커의 특성평가

          이홍림,강종봉 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.5

          Mullite whiskers were synthesized by a vapor-solid reaction with Al(OH)3-SiO2-AlF3. The heat treatment temperature did not affect the shape of mullite whisker but the composition change resulted in different sizes. The first one was 30-50 ㎛ in size with the aspect ratio of 60 and above, and the second one was 600 ㎛ and below in size with the aspect ratio of 15 and below. The Al2O3 content in formed mullite whisker was 73.57-80.29 wt%, which is high Al2O3 content composition. The Young's modulus and the hardness measured by nano-indentation method were 136.7 GPa and 19.81 GPa, respectively.

        • KCI등재후보

          Evaluation of damage on silicon wafers using the angle lapping method and a biaxial fracture strength test

          이홍림,Sung-Eun Park,Han-Seog Oh,정성민 한양대학교 세라믹연구소 2004 Journal of Ceramic Processing Research Vol.5 No.2

          The damage of sawn, lapped, etched and polished wafers was evaluated by the angle lapping method and a biaxial fracture strength test. The Si wafers for analysis were fabricated by the commercial wafering process. As the wafering process proceeded, the depth of damage (DOD) measured by the angle lapping method decreased but the fracture strength measured by the ring-on-ring test increased. As a result, a correlation between DOD and fracture strength was verified using an equation for the fracture toughness, KIC. The fracture strength obtained from the ring-on-ring test was found to be one of the representative values for the mechanical properties of a wafer as it passed through the wafering process.

        • SCOPUSKCI등재

          Al(OH)<sub>3</sub>-SiO<sub>2</sub>-AIF<sub>3</sub>계에서 뮬라이트 휘스커 합성과 열분석

          이홍림,이영우,이정원,강종봉,Lee Hong-rim,Lee Young-Woo,Lee Jung-Won,Kang Jong-Bong 한국재료학회 2005 한국재료학회지 Vol.15 No.10

          The thermal analysis of $Al(OH)_3-SiO_2-AIF_3$ system was done. The thermal behaviors of components and the effect of moisture on the formation of mullite were investigated via TG-DTA and XRD analysis. The mixture of $Al(OH)_3,\;SiO_2,\;AIF_3$showed two endothermic peaks with drastic weight loss and one exothermic peak. Fluorotopaz was formed at $800^{\circ}C$ and turned into mullite completely at $1100^{\circ}C$. But the mixture $Al_2O_3$ of or dehydrated $Al(OH)_3$ and $SiO_2$ could not form mullite even at $1200^{\circ}C$ in which the crystalline phases were $\alpha-Al_2O_3$ ana cristobalite. It was found that the synthesized mullite was aciculate shaped single crystalline whisker.

        • SCOPUSKCI등재

          알콕사이드로부터 Si-Al-O-N계 분말합성 I. 알콕사이드로부터 Si3N4와 $\beta$-Sialon 초미분말 합성

          이홍림,유영창 한국세라믹학회 1987 한국세라믹학회지 Vol.24 No.1

          Synthesis of high purity ultrafine Si3N4 and ${\beta}$-Sialon powders was investigated via the simultaneous reduction and nitriding of amorphous SiO2, SiO2-Al2O3 system prepaerd by hydrolysis of alkoxides, using carbonablack as a reducing agent. In Si(OC2H5)4-C2H5 OH-H2 O-NH4OH system, hydrolysis rate increased with increasing reaction temperature and pH. Pure ${\alpha}$-Si3N4 was formed at 1350$^{\circ}C$ for 5 hrs in N2 atmosphere. In Si(OC2H5)4-Al(OC3H7)3-C6H6-H2 O-NH4OH system, weight loss increased as Si/Al ratio decreased. Single phase ${\beta}$-Sialon consisted of Si/Al=2 was formed at 1350$^{\circ}C$ in N2 and minor phases of ${\alpha}$-Si3N4, AIN, and X-phase were existed besides theSialon phase at other Si/Al ratios. The Si3N4 and Sialon powders synthesized from alkoxides consisted of uniform find particles of 0.05-0.2$\mu\textrm{m}$ in diameter, respectively.

        • SCOPUSKCI등재

          알콕사이드로부터 Si-Al-O-N계 분말합성 II. 알콕사이드로부터 합성한 Si3N4 및 $\beta$-Sialon의 분말 및 소결체의 특성

          이홍림,전명철 한국세라믹학회 1989 한국세라믹학회지 Vol.26 No.2

          Fine Si-Al-OH coprecipitate powders were prepared from Si- and Al-alkoxides by the hydrolysis method. $\beta$-Sialon powder was obtained from prepared Si-Al-OH coprecipitate by the simultaneous reduction and nitridation method. The syntehsized Sialon powder was pressureless sintered at 175$0^{\circ}C$ for 90 min in N2 atmosphere. The characterization of the Sialon powder was performed with XRD, BET, SEM, TEM and particle size analysis. The sinterability and mechanical properties of sintered bodies were investigated in terms of relative density, M.O.R., fracture toughness, hardness and the morphology of microstructure. The highest values of their mechanical properties were obtained for the $\beta$-Sialon ceramics at Z=1 and those values are as follows : M.O.R., KIC and HV of $\beta$-Sialon ceramics(Z=1) are 499.1 MPa, 5.9MN/m3/2 and 18.7GPa, respectively.

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