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Journal of the Korean Ceramic Society 1997;34(11): 1165. |
| SHS 공정에 의한 열전대 보호관용 $ZrB_2$ 세라믹스의 제조 |
| 곽철상, 김상배1, 이윤복, 박홍채, 오기동 |
부산대학교 무기재료공학과
1(주) 한국내화 기술연구소 |
| Fabrication of $ZrB_2$ Ceramics for Thermocouple Protective Tubes by SHS Process |
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| ABSTRACT |
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ZrB2 powders were prepared from a mixture of ZrO2, B2O3 and Mg by self-propagating high temperature synthesis method. The combustion product was successfully obtained from a mixture of ZrO2:B2O3:Mg=1:2:8.5 molar ratio. By-product, MgO was effectively removed by leaching with 1M HCl solution at 9$0^{circ}C$ for over 5hours. After leaching, the Mg content was 0.86~1.42 wt%, and the mean particle size was 4.72${mu}{textrm}{m}$. The addition of 7.5 wt%(14Ni:1.0C) as a sintering aid greatly densified ZrB2 bodies compared with that of only Ni. The ZrB2 sintered bodies containing 7.5 wt%(14Ni:1.0C) was 94.3% of the theoretical density. In this case, ZrB2 existed as a major phase and had a bend strength of 300 MPa and a vickers hardness of 2000 kg/$textrm{mm}^2$. |
| Key words:
$ZrB_2$ powders, Self propagating high temperature synthesis, Combustion products, Acid treatment, Densification, Bend strength, Vickers hardness |
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