碳化硅浇注料在1000℃空气和水蒸气中的高温氧化行为  

Oxidation behavior of SiC castables at 1000℃in air and steam atmospheres

作　　者：曹会彦[1] 王文武[1] 张新华[1] 许海洋[1] 李杰[1] Cao Huiyan;Wang Wenwu;Zhang Xinhua;Xu Haiyang;Li Jie(State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China;不详)

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司,先进耐火材料国家重点实验室,河南洛阳471039

出　　处：《耐火材料》2022年第1期16-19,共4页Refractories

基　　金：2020年度郑洛新国家自主创新示范区创新引领型产业集群专项(201200211500)。

摘　　要：利用扫描电镜、X射线衍射仪等对碳化硅浇注料在1000℃静态空气和纯水蒸气(参照ASTM C863—2000)中分别保温50、100、150 h的高温氧化行为进行了研究。结果表明:1)纯水蒸气氧化条件下,碳化硅浇注料的质量变化率和体积变化率均明显大于静态空气条件下的。2)和空气相比,水蒸气氧化对碳化硅浇注料的结构破坏更严重,可能是由于随时间的延长不能形成有效的保护膜,导致氧化反应持续进行;体积膨胀到一定程度,内部结构被破坏,最终导致材料开裂、剥落,失效。3)不同条件下碳化硅浇注料抗氧化性能差异可能和氢键对氧化膜的破坏有关。Oxidation behavior of SiC castables at 1000℃in static air and steam atmospheres(according to ASTM C863-2000)for 50,100,and 150 h,respectively,was researched through SEM and XRD.The results show that(1)the mass and volume change rates of the castables in pure water steam are obviously larger than those in static air;(2)compared to static air,steam oxidation damages the structure of SiC castables more seriously,which may be caused by the lack of a protective film formed with the extension of the time,leading to continuous oxidation;when the volume continues to expand,the internal structure of the castables is destroyed,resulting in cracking,spalling and failure;(3)the oxidation resistance difference of SiC castables in static air and steam is related to the destruction of hydrogen bonds to the oxidation film.

关 键 词：SiC浇注料 静态空气氧化 水蒸气氧化 物相组成 显微结构 

分 类 号：TQ175[化学工程—硅酸盐工业]