Biomorphic TiN/C ceramics prepared by reduction–nitridation of charcoal/titania composite
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Porous titanium nitride ceramics with a biomorphic microstructure were manufactured at 1400 °C by carbothermal reduction and nitridation of charcoal/titania composites under high concentration nitrogen atmospheres. These composites were prepared from beech-derived charcoal impregnated with titania sol by vacuum/pressure infiltration process. The formation mechanism of TiN was analyzed. The results show that the nitridation is based on gas–solid reaction among TiO (s), N2 (g), C (s) or CO (g). Under higher nitrogen pressure, the nitridation reaction was complete and porous TiN/C ceramics obtained. The phase composition and microstructure of as-obtained porous TiN/C ceramics were characterized by X-ray diffraction and scanning electron microscopy. Experimental results show that the resultant porous TiN/C ceramic had the same external and internal forms of the original wood that consists of cubic phase TiN.
KeywordsTiO2 Titanium Nitride Carbothermal Reduction Beech Wood Tetrabutyl Titanate
The authors would like to express appreciations to Dr. Shaoyun Shan and Dr. Guangya Hou for valuable discussions and use of their facilities.
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