摘要
以Fe2O3、WO3、Al和C为反应原料，采用SHS-离心法制备W-C—Fe内衬复合钢管．利用X射线衍射分析内衬层的相组成，扫描电镜观察金属陶瓷涂层的组织，利用能谱仪分析涂层与基体结合处的元素分布，显微硬度仪测量内衬层硬度．结果表明：涂层与基体之间形成良好的冶金结合，涂层主要由Fe3W3C组成，还有少量的WC、W2C、Fe3C和Fe；涂层组织呈梯度分布，靠近基体处晶粒细小，远离基体处晶粒呈粗大树枝状；涂层显微硬度为13．5±1．6GPa，是基体的7～8倍．
A cermet lined steel pipe was prepared by the self-propagating high-temperature synthesis （SHS） centrifugal process. In the process, Fe203, WO3, Al and C were used as the staring mixture in order to synthesize a cermet lined coating after the mixture ignited and combusted. The phases in the synthesized coating were examined by X-ray diffraction （XRD）. The of the coating and the substrate/coating bonding interface and the distribution of elements adjacent to the interface were analyzed by scanning electron microscopy （SEM） and energy dispersion spectroscope （EDS）. The hardness of the coating was measured. The resuits show that a metallurgical bonding interface is formed between the coating and the substrate pipe. The coating is mainly composed of Fe3W3C, and there is a little WC, W2C, Fe3C and Fe in the coating. The phases in the coating possess a gradient distribution along the depth of the coating. The grains near the substrate are fine but those far from the substrate are coarse dendrite crystals. The microhardness of the coating is 13,50 ± 1.6 GPa, which is 7 - 8 times higher than that of the substrate.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2008年第6期648-651,共4页
Journal of University of Science and Technology Beijing
关键词
复合管
金属陶瓷
自蔓延
硬度
梯度分布
composition pipe
cermet
SHS
hardness
gradient distribution
