| 방전 플라즈마 소결법에 의한 다공성 육티탄산 칼륨 휘스커 프리폼의 제조 |
| 이장훈, 조동철, 조원승, 이지환 |
| 인하대학교 재료공학부 |
| Preparation of Porous K2Ti6O13 Whisker Preform by Spark Plasma Sintering |
| Chang-Hun Lee, Dong-Choul Cho, Won-Seung Cho, Chi-Hwan Lee |
| School of Materials Science and Engineering, Inha University |
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| ABSTRACT |
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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. |
| Key words:
Preform, $K_2Ti_6O_{13}$ whisker, Porous, Spark plasma sintering |
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