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采用丝网印刷法在氧化铝基底上制备了La0.6Sr0.4FeO3薄膜。利用扫描电镜、流变仪、X射线衍射仪、红外光谱仪、四探针和划痕仪研究了有机载体配比对薄膜成膜效果、浆料粘度、电阻均匀性和与基底结合强度等的影响。结果表明,松油醇和乙基纤维素(EC)的配比对浆料成膜效果影响显著,加入60%松油醇时,薄膜较为平整,但裂纹较多。当加入乙基纤维素(EC)2%~3%时,浆料粘度提高为0.23 Pa·s和0.55 Pa·s,最有利于薄膜印刷,且膜裂纹少,膜层均匀连续;烧结后的薄膜为单一的钙钛矿相,且Fe-O键比粉体的结合强;并且薄膜方阻均匀,与基底的结合力强。因此松油醇含量60%、EC加入量2%~3%的铁酸锶镧浆料最适于丝网印刷成膜。
La0.6Sr0.4FeO3 thin films were prepared on alumina substrate by screen printing method. The influence of organic carrier ratio on film formation, slurry viscosity, resistance uniformity and bond strength with substrate was investigated by SEM, rheometer, X-ray diffraction, infrared spectroscopy, four-probe and scratch tester . The results showed that the ratio of terpineol and ethyl cellulose (EC) had a significant effect on the filming effect of the slurry. When 60% terpineol was added, the film was relatively smooth but with more cracks. When 2% ~ 3% ethylcellulose (EC) was added, the viscosity of the slurry increased to 0.23 Pa · s and 0.55 Pa · s, which was the most favorable for the film printing with less film cracks and even film continuity. After the sintering The film is a single perovskite phase, and the Fe-O bond is stronger than the powder; and the film is uniform in square resistance and strong in combination with the substrate. Therefore, the content of terpineol 60%, EC added 2% to 3% of the strontium lanthanum ferrite slurry is most suitable for screen printing film.