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覆铝钢板搪瓷的底材化学处理 总被引:2,自引:2,他引:0
研究了覆铝钢板复合材料的表面化学状态与搪瓷密着性的关系,认为表面的组织状态与结构对搪瓷密着性有很大的影响。实验得出,铬浴处理后的覆铝钢板表面活性强,组织结构适合瓷釉元素的扩散,搪瓷界面过渡层宽度增加,密着强度提高。 相似文献
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An investigation of the fundamentals of the adherence of porcelain enamels to metals indicated that good adherence is the result of metal-to-metal bonds between the atoms in the base metal and the proper metallic ions in the enamel. To accomplish this type of bond, the enamel must meet certain chemical and thermodynamic requirements: (1) The enamel at the interface must be saturated with an oxide of the metal and (2) this oxide must be one which, when in solution in the glass, will not be reduced by the metal. In the case of iron, the oxide is FeO. Many of the phenomena observed in commercial enameling were investigated and found to be related to adherence, but not essential for its development. An example is the precipitation of metallic particles in the enamel. Much of the complexity in commercial enameling arises from the limitations imposed by practical considerations. For example, because enamels usually are fired in air, the heavy scale developed during the early stages of firing must be removed before adherence can be developed. Likewise, as the conditions of the enamel-metal interface change rapidly during firing, "adherence-promoting oxides" are used to help maintain the necessary conditions for the time required in commercial enameling. Surface roughness, although not necessary for excellent adherence, was found to improve the apparent adherence when the bond between the enamel and the metal was relatively weak. 相似文献
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Ken Chen Minghui Chen Zhongdi Yu Shenglong Zhu Fuhui Wang 《International Journal of Applied Ceramic Technology》2019,16(1):185-194
The effect of element Ti on adherence between a CoO-bearing single-layer enamel coating and steel was investigated. Falling-weights tests were carried out and cross-sections at interface of the enamel/substrate were analyzed with a scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS). Results show that addition of TiO2 reduced adherence of the enamel coating by hindering the formation of anchor-like alloy precipitates. The decrease of anchor points lies in the following three reasons: I. The diffusion path of Co2+ ions to the interface was lengthened because of the blocking effect of rutile and the FeTiO3 crystals; II. Formation of CoTiO3 crystals leads to a reduction of free Co2+ ions; III. Co–Fe precipitates form away from the enamel/substrate interface, as FeTiO3 crystals provide extra surface for the nucleation of Fe–Co alloy precipitates. 相似文献