• Proceedings of the Korean Ceranic Society Conference
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• 2003.04a
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• pp.122.2-122
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• 2003

• Proceedings of the Korean Ceranic Society Conference
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• 2000.10a
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• pp.120.2-120
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• 2000

• The Science & Technology
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• v.17 no.8 s.183
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• pp.45-47
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• 1984

고분자 휘스커 (Polymer-Whisker) / 초밀비자 (Submicron Particles) / 레이저광선이용 피혁재단 / 프랑스 특유의 컴퓨터 언어개발

• Korean Journal of Materials Research
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• v.3 no.6
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• pp.606-613
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• 1993

This was studied about aging characteristic of AC4A/$SiC_{w}$ 10-30v/o reinforced composite. Aging hardenability was decreased $SiC_{w}$ 30% > 10% > 20%. Aging hardening of T6 treatmented composite was higher absolute value than AC4A I/M material. And this results indicated initial hardening phenomenon according to increase $SiC_{w}$ volume fraction. Reinforced effect by pressure was the same effect as before aging treatment and the best condition pressure at 75MPa. Similar to reinforced effect according to $SiC_{w}$ volume fraction was 30 % > 10 % > 20 %. In case of pressure is low, whisker is not break the same time press with base metal after wetting. After it is wetting with base metal, a part transformed or wetting part break and whisker maintain original shape or a part transformed on the otherhand, in case of pressure is high, whisker is break in same time it was not against pressure and whisker's shape is near a polygon or spherical shape.

• Journal of the Korean Ceramic Society
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• v.39 no.3
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• pp.272-277
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• 2002

Aluminum nitride (AlN) powders and whiskers were synthesized by a modified carbothermal reduction and nitridation where a ($NH_4)[Al(ethylenediaminetetraacetate)]{\cdot}2H_2O$ complex is used as precursor. The AlN powders were obtained by calcining the complex without mixing any carbon source under a flow of nitrogen in the temperature range 1200∼1500$^{\circ}$C and then burning out the residual carbon. The nitridation process was investigated by $^{27}Al$ magic-angle spinning (MAS) unclear magnetic resonance, infrared spectroscopy and X-ray diffraction. The complex is pyrolyzed, converted to ${\rho}$- and ${\gamma}$- alumina and then nitridated to AlN without ${\gamma}-{\alpha}$ alumina transition. The morphology of ${\gamma}$-alumina, when it was converted to AlN, was retained, strongly indicating that ${\gamma}$-alumina is converted to AlN through solid-state $AlO_xN_y$, not through gaseous intermediates such as aluminum and aluminaum suboxides. AlN whiskers were obtained, when a (0001) sapphire was used as a catalyst.

• Journal of the Korean Ceramic Society
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• v.41 no.1
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• pp.51-56
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• 2004

Mullite whiskers were synthesized using $Al(OH)_3$, amorphous $SiO_2$ and $AIF_3$ as starting materials by a vapor-solid reaction at relatively low temperature of $1100^{\circ}C$. Leaflet Fluorotopaz was observed for the specimen heat-treated at $800^{\circ}C$. Fluorotopaz was decomposed at $1000^{\circ}C$ and only mullite phase was observed for the specimen sintered at $1100^{\circ}C$ and above. It was found that the synthesized mullite at $1200^{\circ}C$ had grown to [001] direction and side planes were the {110}. The distance of (110} plane was $5.34^{\AA}C$. The amounts of $Al_2O_3$ in mullite was 73.56(1.39)wt%.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 1998.11a
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• pp.41-46
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• 1998

최근 항공기나 자동차 분야에서 엔진의 경량화 및 출력 향상 둥의 목적으로 고온 구조용 세라믹스가 큰 주목을 받고 있는 가운데, monolith 세라믹스의 인성 부족을 보완하기 위하여 세라믹 휘스커나 장섬유를 이용하는 새로운 세라믹 복합재료의 개발에도 많은 연구가 수행되고 있다. (중략)

• Proceedings of the Korean Ceranic Society Conference
• /
• 2003.04a
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• pp.212.1-212
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• 2003

• Proceedings of the Korean Ceranic Society Conference
• /
• 2000.10a
• /
• pp.44.1-44
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• 2000

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.04b
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• pp.31-32
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• 2009