氧化铁含量对石墨烯/CNTs增强陶瓷涂层性能的影响

Effect of Fe_2O_3 Content on Properties of Ceramic Coating Reinforced by Graphene/CNTs

为了得到一种性能优异的低温固化复合陶瓷涂层,以石墨烯和多壁碳纳米管(CNTs)为增强相,与氧化铝、氧化锌、氧化锆和氧化铬按一定比例制成骨料,加入催化剂氧化铁,与粘接剂混合充分,手工涂覆于304不锈钢表面制得一种低温固化复合陶瓷涂层。通过示差扫描量热法(DSC)、红外光谱技术(FTIR)、扫描电子显微镜(SEM)以及能谱仪(EDS)对复合陶瓷涂层的热力学参数、表面形貌以及纳米颗粒的分散性进行了表征,研究了不同含量氧化铁对涂层的显微硬度、断裂韧性以及摩擦学性能的影响。结果表明:复合陶瓷涂层制备工艺简单,结构紧密,纳米颗粒的分散性较好;涂层的显微硬度和断裂韧性随着氧化铁含量的增加先增加后减少,当氧化铁含量为3%时,达到最佳;涂层的摩擦系数随着氧化铁含量的增加先增加后减少然后保持不变,当氧化铁含量为4%时涂层摩擦系数最小,摩擦学性能达到最好。

Low temperature curing composite ceramic coatings were hand-made painted on 304 stainless steel using graphene and multi-walled carbon nano-tubes（CNTs） as reinforced phases, assembling alumina, zinc oxide, zirconium oxide and chromium oxide in a certain proportion as aggregates, adding iron oxide as catalyst and thoroughly mixing the binders. The thermodynamic parameters and surface morphology of composite ceramic coatings and the dispersion of nanoparticles were characterized by differential scanning calorimetry （DSC）, Fourier transform infrared spectroscopy （FTIR）, scanning electron microscopy （SEM） and energy dispersive spectrometer （EDS）~ The effects of different contents of iron oxide on the microhardness, fracture toughness and tribological properties of the coating were also investigated. Results showed that the preparation process of coating was simple, and the structure of asobtained coating was compact. Furthermore, the nanoparticles were distributed uniformly in the coating. The microhardness and fracture toughness of the coating increased firstly and then decreased with the increase of iron oxide, which reached to the optimal when the content of iron oxide was 3%. Furthermore, the friction coefficient of the coating increased firstly and then decreased, and then remained constant with the increase of iron oxide, which reached to the optimal when the content of iron oxide was 4 %.