摘要
分析了２５ Ｃｒ３５ Ｎｉ耐热合金表面的沉积焦炭，探讨了焦炭的形成机理．结果表明，焦炭分为三种类型，即丝状焦炭、层片状焦炭和颗粒状焦炭；局域丝状焦炭的沉积与材料表面化学成分密切相关，其余焦炭的形成和生长本质上不受材料成分的影响；丝状焦炭的生长促进材料表面继续结焦和渗碳，而非催化焦炭的沉积一定程度地抑制催化焦炭的继续形成和发展。
The surface coking 25Cr35Ni heat\|resistant alloy was investigated in detail and the surface coking mechanism was discussed. The results revealed that the coke was consisted of typical structure of an outer layer of filamentary coke, then the lamellar coke and an inner layer of spheroidal coke. The deposition of filamentary coke is closely related to the alloy compositions, but this is not for the lamellar and spheroidal coke. The growth of catalytic filamentary coke promotes continuous coking and carburization, whereas the deposition of non\|catalytic coke retards the development of filamentary coke to some extent, which further alleviates the carburization degree of materials.
出处
《腐蚀科学与防护技术》
CAS
CSCD
1999年第5期274-278,共5页
Corrosion Science and Protection Technology
基金
中国石化总公司基金
辽宁省科学技术基金
关键词
耐热合金
结焦
渗碳
催化
石油裂解装置
heat\|resistant alloy, coking, carburization, catalysis
