生物形态多孔氮化钛陶瓷的碳热氮化法制备  

Porous Biomorph-genetic TiN/C Ceramics by Carbothermal Reduction-Nitridation Using Beech Wood

作　　者：罗民[1] 高积强[1] 张笑[1] 杨建峰[1] 侯广亚[1] 欧阳达[1] 金志浩[1] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室

出　　处：《稀有金属材料与工程》2006年第A02期133-136,共4页Rare Metal Materials and Engineering

摘　　要：研究了以生物模板(木炭)浸渍TiO2溶胶,高温碳热-氮化制备TiN陶瓷的工艺过程。应用热力学原理计算了经溶胶浸渍后形成的TiO2／C复合体系的氮化条件,确定了N2,CO分压对氮化温度的影响。采用碳热氮化法,在高浓度的氮气压力下反应烧结制备了具有生物形貌的多孔TiN／C陶瓷。结果表明:在1400℃,4 h,0．5 MPa氮气压力下,得到了具有立方晶体结构的TiN／C多孔陶瓷,并保留了木材模板的显微结构。A porous titanium nitride ceramics with a biomorphic microstructure was prepared at 1400℃ for 4h by carbothermal reduction and nitridation of TiO2/C composite under high concentration nitrogen atmosphere（0.5MPa）, These composites were prepared using beech wood impregnated with titania sol by vaccum/pressure infiltration process. The nitridation conditions of the TiO2/C composite were analyzed by thermodynamic calculation. Microstructural observation and phase structure of as-obtained woodceramics were performed by scanning electron microscopy and X-ray diffraction, respectively. Experimental results showed that The resultant porous TiN/C ceramics had the same external and internal forms of the original wood.

关 键 词：生物模板 木材陶瓷 氮化钛 碳热-氮化法 

分 类 号：TB383.4[一般工业技术—材料科学与工程]