CAJ | 학술논문

以高钛渣为主要原料制备的TiN/O'-Sialon导电陶瓷为研究对象,研究TiN/O'-Sialon材料在1200～1300℃下的抗空气氧化行为.采用DTA-TG法研究材料的恒温和变温氧化过程,利用X射线衍射、扫描电镜和能谱分析检测方法对氧化产物的相组成和显微结构进行表征.结果表明:TiN和O'-Sialon的氧化分别从500℃和1 050℃左右开始进行.在1200～1300℃下氧化后的材料表面可形成由 Fe2MgTi3O10、SiO2和TiO2组成的较致密的保护膜,其形成主要与材料中TiN含量、氧化产物中SiO2和非晶相数量以及材料显气孔率有关.材料氧化前期遵循直线规律,中后期遵循抛物线规律,其表观活化能分别为1.574x105 J/mol和2.693x105 J/mol.增加材料中TiN的含量从而导致材料单位面积氧化质量显著增加.
이고태사위주요원료제비적TiN/O'-Sialon도전도자위연구대상,연구TiN/O'-Sialon재료재1200～1300℃하적항공기양화행위.채용DTA-TG법연구재료적항온화변온양화과정,이용X사선연사、소묘전경화능보분석검측방법대양화산물적상조성화현미결구진행표정.결과표명:TiN화O'-Sialon적양화분별종500℃화1 050℃좌우개시진행.재1200～1300℃하양화후적재료표면가형성유 Fe2MgTi3O10、SiO2화TiO2조성적교치밀적보호막,기형성주요여재료중TiN함량、양화산물중SiO2화비정상수량이급재료현기공솔유관.재료양화전기준순직선규률,중후기준순포물선규률,기표관활화능분별위1.574x105 J/mol화2.693x105 J/mol.증가재료중TiN적함량종이도치재료단위면적양화질량현저증가.
The oxidation behavior of electroconductive TiN/O'-Sialon ceramics prepared using high titania slag as main starting material was studied at 1 200-1 300 ℃ in air.The isothermal and non-isothermal oxidation processes were investigated by DTA-TG Phase compositions and morphologies of the oxidized products were analyzed by XRD,SEM and EDS.The results indicate that the oxidation of TiN and O'-Sialon occurs at about 500 ℃ and 1 050 ℃,respectively.After oxidation at 1 200-1 300 ℃,a protective scale that consists of Fe2MgTi3O10,SiO2 and TiO2 is formed on the surface of the materials,which effectively prevents the oxidation process.The formation of a protective scale is relative to TiN content and apparent porosity of the samples,the amount of SiO2 and amorphous phase in the oxidation product.At the initial oxidation stage,the oxidation kinetics of the materials follows perfectly the linear law with the apparent activation energy of 1.574×105 J/mol,and at the late-mid stage,the oxidation of the samples obeys the parabolic law with the apparent activation energy of 2.693× 105 J/moi.With the increase of TiN content,mass gain of the materials increases significantly.