CAJ | 학술논문

采用静态氧化法对不同温度下TiB2陶瓷的氧化行为进行研究,利用X射线衍射仪、扫描电镜、X射线光电子能谱仪对氧化前后的样品进行表征.结果表明:低温下TiB2陶瓷氧化动力学满足抛物线规律,并在表面形成液相B203,阻止氧化反应的进一步进行,冷却后B2O3以玻璃态覆盖在表面.高温下TiB2氧化反应在4h前满足抛物线规律,表面形成一层TiO2多孔结构;氧化4h后,随着氧扩散距离的延长,扩散阻力加大,从而使氧化速率降低,氧化反应不再满足抛物线规律.
채용정태양화법대불동온도하TiB2도자적양화행위진행연구,이용X사선연사의、소묘전경、X사선광전자능보의대양화전후적양품진행표정.결과표명:저온하TiB2도자양화동역학만족포물선규률,병재표면형성액상B203,조지양화반응적진일보진행,냉각후B2O3이파리태복개재표면.고온하TiB2양화반응재4h전만족포물선규률,표면형성일층TiO2다공결구;양화4h후,수착양확산거리적연장,확산조력가대,종이사양화속솔강저,양화반응불재만족포물선규률.
The oxidation behavior of TiB2 ceramics at different temperatures was investigated using the static oxidation kineticmethod. The samples before and after oxidation have been characterized by X-ray diffractometer, scanning electron microscope andX-ray photoelectron spectrometer. The results show that the oxidation kinetics appear the parabolic law at low temperature. A liquidB2O3 coating on the surface of TiB2 ceramic could prevent from further oxidation. After the ceramic samples were cooled, their sur-faces were covered with glassy B2O3. At high temperature, the oxidation reaction of TiB2 ceramics showed the parabolic law onlybefore 4 h. Porous rutile TiO2 formed on the surface. But the oxidation behavior with the parabolic law for the TiB2 ceramics was notobserved after oxidation for 4 h because of the long path of diffusion, strong diffusion resistance and low reaction rate.