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首页> 外文会议>63rd World Foundry Congress Sep 12-18, 1998 Budapest, Hungary >DEVELOPMENT OF DOUBLE-LAYERED CERAMIC FOAM FILTER FOR IRON CASTING
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DEVELOPMENT OF DOUBLE-LAYERED CERAMIC FOAM FILTER FOR IRON CASTING

机译：铸铁用双层陶瓷泡沫过滤器的研制

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摘要

Production of clean and high quality castings is becoming increasingly important in order to remain competitive in today's global market. In Ms view, use of various type filters during the casting is commonly done for the both of iron and non-iron castings as the means to improve casting processes. In this study the double-layered ceramic foam filter is developed to realize reasonable inoculation reaction and removal of the resultant reaction products from the casting, simultaneously. The filter is made by combination of the first filter containing inoculant and the second one with the porosity finer than the first. In the test experiment, Fe-Si-Ca-Al-Ba alloy is used as the inoculant. The grain distribution of inoculant is ranged 45 to 210 urn. Two kinds of cast iron(FC:3.32wt%C and FCD : 3.61wt%C)are investigated for graphite morphology, matrix structure, mechanical strength and so on. The pouring temperature is 1630 to 1667 K. As the result, graphite is precipitated fully to the shape of A type in grey iron and to the smooth and shapely particles in ductile iron. The oxide generated by inoculation reaction is observed to be entrapped by the second filter, yielding the castings with less inclusions. Tensile strength and elongation are increased for both the grey and ductile iron by the filtration, which is caused not only by the graphite shape control but by the improvement of matrix structure. The proposed filter system is shown to be the reasonable one giving inoculation reaction-filtration space without fading. We have a view that the use of the developed double-layered filter enables us to establish a low-cost and simple casting design in order to obtain clean and high quality products.
机译：为了在当今的全球市场上保持竞争力，清洁和高质量铸件的生产变得越来越重要。在女士看来，通常在铸铁过程中使用各种类型的过滤器作为铁铸件和非铁铸件的一种，以改善铸件工艺。在这项研究中，开发了双层陶瓷泡沫过滤器，以实现合理的接种反应并同时从铸件中除去生成的反应产物。该过滤器是通过将含有孕育剂的第一个过滤器与第二个过滤器组合而成的，其孔隙率比第一个过滤器细。在试验实验中，Fe-Si-Ca-Al-Ba合金用作孕育剂。孕育剂的粒度分布范围为45至210微米。研究了两种铸铁（FC：3.32wt％C和FCD：3.61wt％C）的石墨形态，基体组织，机械强度等。浇注温度为1630至1667K。结果，灰铁中的石墨完全沉淀为A型，而球墨铸铁中的石墨则沉淀为光滑且整齐的颗粒。观察到由接种反应产生的氧化物被第二过滤器截留，从而产生了具有较少夹杂物的铸件。通过过滤，灰铁和球墨铸铁的拉伸强度和伸长率均增加，这不仅是由于石墨形状的控制，而且是由于基体结构的改善所致。所提出的过滤器系统被证明是合理的，可以提供接种反应过滤空间而不会褪色。我们认为，开发的双层过滤器的使用使我们能够建立低成本，简单的铸造设计，从而获得清洁优质的产品。

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