• Title/Summary/Keyword: 방전 플라즈마 소결법

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Fabrication of High Density TiN using a Spark Plasma Sintering Technique (방전 프라즈마 소결법에 의한 고밀도 TiN의 제조)

  • 심광보;원종한;김경훈
    • Journal of the Korean Ceramic Society
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    • v.38 no.6
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    • pp.587-592
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    • 2001

  • 난소결성의 TiN에 방전 플라즈마 소결법을 적용하여 고밀도 TiN 소결체를 제조하였다. 제조된 TiN 시편의 소결특성 및 입성장 정도를 평가하였으며, 전자현미경을 이용하여 미세구조를 분석하였다. Milling 과정동안 잠입된 $Al_2$O$_3$는 1$700^{\circ}C$ 이상의 소결온도에서 TiN 분말과 반응하여 부분적으로 액상을 형성하여 물질이동을 가속화함으로써 치밀화가 저온에서 시작하도록 함으로써 궁극적으로 결정립성장 제어에 기여하는 것으로 확인되었다. 이러한 현상은 굽어진 TiN 결정입계와 결정입계 삼중점에 존재하는 $Al_2$O$_3$를 포함하는 2차 결정상 cluster의 존재로 설명되어진다.

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Preparation of Porous K2Ti6O13 Whisker Preform by Spark Plasma Sintering (방전 플라즈마 소결법에 의한 다공성 육티탄산 칼륨 휘스커 프리폼의 제조)

  • Lee, Chang-Hun;Cho, Dong-Choul;Cho, Won-Seung;Lee, Chi-Hwan
    • Journal of the Korean Ceramic Society
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    • v.39 no.12
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    • pp.1197-1202
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    • 2002

  • In order to develope the porous $K_2Ti_6O_13$ whisker preform with good strength, the pore characteristics and compressive strength were investigated as a function of spark plasma sintering temperature. As a result, high porous whisker preform were successfully fabricated by sintering at 900∼950${\circ}C$ for 10 min under a pressure of 40 MPa, heating rate of 50${\circ}C$/min and on-off pulse type of 12:2. The whisker preform prepared under above optimum condition showed relatively high compressive strength of 174∼266 MPa, despite of high porosity ranging from 15% to 37%. This improvement in strength was considered to be mainly due to the spark-plasma discharges and the self-heating action between whiskers. The compressive strength of whisker preform, fabricated at sintering temperature less than 900${\circ}C$, showed 80∼100 MPa. This is low strength level less than one half times compared with whisker preform fabricated at 900∼950${\circ}C$. The whisker preform fabricated at 1000${\circ}C$ showed the highest compressive strength of 523 MPa, but resulted in low porosity of ∼5%. Based on above results, it was considered that spark plasma sintering was an effective method for developing high strength and porosity of whisker preform.

  • https://doi.org/10.4191/KCERS.2002.39.12.1197 인용 PDF KSCI