摘要
由Ｎｉ－Ｃｒ合金制成的燃烧室壁，在烃燃料燃烧的气氛中产生金属外逸型坑点状破坏，严重时可烧穿。作者利用几种现代手段和试验方法，对这一燃烧破坏现象进行了系统地模拟研究，发现这是ＣＯ和低分子烃在高温下对合金共同作用的结果：第一步ＣＯ作用使合金表层发生氧化和碳化，造成裂隙；第二步低分子烃扩散进裂隙并在Ｎｉ－Ｃｒ２Ｏ３微粒的催化下，裂解生在石墨炭并包复在Ｎｉ－Ｃｒ２Ｏ３微粒周围，体积增大。两种作用交替进行，造成金属外逸。基于此，作者提出了“石墨炭顶举金属微粒”的高温催化破坏作用机理。在燃烧室和本生焰条件下。
The burning chamber made of Ni-Cr alloy,can be destroyed under the incompletely burning condition of hydrocarbon fuel.The wall of the burning chamber was pitted at the beginning then gradually burnt through.By means of the Bunsen burner,tubular furnace and XRD,SEM,EDS,this special type of high-temperabure destruction was studied.It was found that the phenomenon is resulted from the combined action of CO and lower hydrocarbon on Ni-Cr alloy.Firstly,Ni-Cr alloy is carbonized and selectively oxidized by CO to produce Cr2C,Cr3C2 and Ni-Cr2O3,while the capillary cracks in the surface layer are formed simultaneously.Secondly the lower hydrocarbon is catalytically split to produce graphite carbon on Ni-Cr2O3.These two steps are conducted alternately and the crystalline particles of Ni-Cr alloy are pushed up by the catalytically-produced graphite carbon.Based on the results obtained,a mechanism for such a high-temperature catalytic destruction of Ni-Cr alloy was proposed.
出处
《化学研究》
CAS
1999年第2期1-8,共8页
Chemical Research
关键词
航空煤油
煤油
燃烧腐蚀
镍铬合金
燃烧室
腐蚀
Ni-Cr alloy
high-temparature catalysis
graphite carbon
corrosion mechanism
