http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Fabrication of SiC Fiber-SiC Matrix Composites by Reaction Sintering
임광영,김영욱,박지연 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.4
This paper presents a new process for producing SiC fiber-SiC matrix (SiC/SiC) composites by reaction sintering. The processing strategy for the fabrication of the SiC/SiC composites involves the following: (1) infiltration of the SiC fiber fabric using a slurry consisting of Si and C precursors, (2) stacking the slurry-infiltrated SiC fiber fabric at room temperature, (3) cross-linking the stacked composites, (4) pyrolysis of the stacked composites, and (5) hot-pressing of the pyrolyzed composites. It was possible to obtain dense SiC/SiC composites with relative densities of >96% and a typical flexural strength of ~400 MPa. This paper presents a new process for producing SiC fiber-SiC matrix (SiC/SiC) composites by reaction sintering. The processing strategy for the fabrication of the SiC/SiC composites involves the following: (1) infiltration of the SiC fiber fabric using a slurry consisting of Si and C precursors, (2) stacking the slurry-infiltrated SiC fiber fabric at room temperature, (3) cross-linking the stacked composites, (4) pyrolysis of the stacked composites, and (5) hot-pressing of the pyrolyzed composites. It was possible to obtain dense SiC/SiC composites with relative densities of >96% and a typical flexural strength of ~400 MPa.
임광영,장두희,박지연,박동수,김영욱 대한금속·재료학회 2008 METALS AND MATERIALS International Vol.14 No.5
This paper reports a new process for producing dense 2D SiC fiber-SiC (SiC/SiC) composites through slurry infiltration and stacking. The processing strategy for the fabrication of the 2D SiC/SiC composites involves: (i) infiltration of the SiC fiber fabric using a SiC slurry, (ii) stacking the slurry-infiltrated SiC fiber fabric and SiC tapes alternately at room temperature, (iii) pyrolysis of the stacked composites and (iv) hot-pressing the pyrolyzed composites. It was possible to obtain dense 2D SiC/SiC composites with relative densities of >96 % by controlling the hot-pressing time at 1750℃.
임광영,김영욱,송인혁,배지수 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.5
Macroporous silicon carbide (SiC) ceramics were fabricated by powder processing and polymer processing using carbon-filled polysiloxane as a precursor. The effects of the starting SiC polytype, template type, and template content on porosity and flexural strength of macroporous SiC ceramics were investigated. The β-SiC powder as a starting material or a filler led to higher porosity than α-SiC powder, owing to the impingement of growing α-SiC grains, which were transformed from β-SiC during sintering. Typical flexural strength of powder-processed macroporous SiC ceramics fabricated from α-SiC starting powder and polymer microbeads was 127 MPa at 29% porosity. In contrast, that of polymer-processed macroporous SiC ceramics fabricated from carbon-filled polysiloxane, β-SiC fillers, and hollow microspheres was 116MPa at 29% porosity. The combination of α-SiC starting powder and a fairly large amount (10 wt%) of Al_2O_3-Y_2O_3 additives led to macroporous SiC ceramics with excellent flexural strength.
임광영,장두희,김영욱,박지연,박동수 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.7
2D SiC fiber-SiC (SiC/SiC) composites were fabricated via slurry infiltration and a stacking process. The effects of the additive composition and content in SiC slurries and the effect of the sintering time on the sintered density and strength of SiC/SiC composites were investigated. A slurry containing Al2O3-Y2O3-MgO (AYM) additives led to a higher strength compared to a slurry containing Al2O3-Y2O3-CaO (AYC) additives. The sintered density increased as the sintering time increased and showed a maximum (>98%) at 4 h. In contrast, the flexural strength increased as the sintering time increased and showed a maximum (615 MPa) at 6 h. The relative density and flexural strength increased as the additive content increased.
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.
알루미늄 첨가가 다공질 Self-Bonded SiC 세라믹스의 기공률과 꺾임강도에 미치는 영향
임광영,김영욱,우상국,한인섭,Lim, Kwang-Young,Kim, Young-Wook,Woo, Sang-Kuk,Han, In-Sub 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.5
Porous self-bonded silicon carbide (SBSC) ceramics were fabricated at temperatures ranging from 1750 to $1850^{\circ}C$ using SiC, Si, C as starting materials and Al as an optional sintering additive. The effect of Al addition on the porosity and strength of the porous SBSC ceramics were investigated as functions of sintering temperature and Si:C ratio. The porosity increased with decreasing the Si:C ratio and increasing the sintering temperature. It was possible to fabricate SBSC ceramics with porosities ranging from 37% to 44% by adjusting the Si:C ratio and the sintering temperature. Addition of Al additive promoted densification and necking between SiC grains, resulting in improved strength. Typical flexural strengths of SBSC ceramics with and without Al addition were 44 MPa and 34MPa, respectively.