摘要
本文研究了含有0～1.8％稀土合金的4Cr18Ni9W_2SiMnRE铸钢和1Cr25Ni20Si2钢的高温抗氧化性,使用马弗炉将试样加热至900℃左右的预定温度进行试验,介质选择有空气、涂布水泥熟料等,使用了电子显微镜、热平衡仪等技术对试样进行试验、测试。本文认为水泥对合金有腐蚀和加速氧化的作用,适量稀土的存在改善了合金在所有试验条件下的抗氧化性和抗腐蚀性.本文讨论了稀土作用的机理,根据形貌检查和元素分布等情况,作者提出了稀土改善试验合金抗氧化性的主要原因是稀土促进合金形成了保护性的致密氧化膜,改善了该膜对基体的粘附性.此外,稀土还有阻止腐蚀性离子扩散和渗透的作用。作者断定含有0.95～1.45％稀土合金的试验铸钢能够取代1Cr25Ni20Si2钢作为水泥窑设备用材。
Oxidation bahavior of cast-steel 4Crl8Ni9W_2SiMnRE containing up to 1.8% rare earth metals (RE) and lCr25Ni20Si2 has been studied by SEM, thermebalance, etc, after the alloys were coated with cement clinker or pre-oxided film, and heated to 900℃ or so in a muffle furance. The paper shows that cement has the effect of corrosion and accelerating oxidation on the alloys, and that presence of the sutable amount of RE can improve the corrosion resistance and oxidation resistance behavior of the alloys under all experimental conditions. The mechanism of the effect of RE has been discussed. From the investigation of morphology and distribution of elements, etc, the authors present that the main reason that RE improves the oxidation resistance of experimental alloys is that RE promotes alloys to form protective and compact film, and improves adherence of the film to the matrix. In addition, RE has the effect which hampers dispersion and penetration of corrosive ions. The authors conclude that experimental cast-steel containing 0.95-1.45% RE can replace lCr25Ni20Si2 for the materials of cement kiln.
关键词
水泥窑
稀土
耐热铸钢
抗氧化
the cement kiln
Re Reat-resietant cast steel
Oxidation resistance
