分析了２５Ｃｒ３５Ｎｉ耐热合金表面的沉积焦炭，探讨了灰的形成机理。结果表明，遄分为三种类型，即丝状焦炭、层片状炭和颗粒状焦崦；局域丝状焦崦的沉积与材料表面化学成分必切相关，其变形成和生长本质上不受材料成分的影响；丝状焦 生长促进材料表面继续结焦和渗碳，而非焦炭的沉积一定程度地抑制催化灰的继续形成和发展，进而减轻材料的碳侵蚀程度。
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 consist- ed of typical structure of an outer layer of filamentary coke, then the lamellar coke and an in- ner 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.
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