Two-step sintering of a TiB2-Ni cermet |
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| Authors: | Weon-Ju Kim Do-Hyeong Kim Eul Son Kang Do Kyung Kim Chong Hee Kim |
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| Affiliation: | (1) Department of Ceramic Science and Engineering, Korea Advanced Institute of Science and Technology, 305-701 Yusong-Gu, Taejon, Korea;(2) Present address: Ceramic Materials Division, Research Institute of Industrial Science and Technology, 790-600 Pohang, Korea;(3) Present address: Advanced Technology R&D Centre, Agency for Defense Development, 300-600 Taejon, Korea |
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| Abstract: | The effect of atmosphere control on the sintering behaviour of TiB2-20 wt% Ni ceramics was investigated. Sintering was performed at 1700 °C for 1h with commercial TiB2 powders produced by the earbothermic reaction. Under a fixed single atmosphere such as vacuum or Ar, densification was limited and large pores remained. However, a sintered density above 99% of theoretical could be achieved by a two-step sintering procedure in which the atmosphere was changed from vacuum to Ar at 1600 °C during the heat-up with subsequent isothermal sintering being performed at 1700 °C for 1h. Qualitative considerations about these phenomena are discussed. |
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