Yttria foamed ceramic filter and preparation method thereof

Abstract

The invention discloses an yttria foamed ceramic filter and a preparation method thereof. The principal crystalline phase of the filter is yttria. The preparation process of the filter comprises the following steps of: mixing yttria or yttria and additives which are used as raw material with an adhesive, a dispersant and deionized water to prepare slurry; soaking the slurry with soft polyurethane foam which is used as a carrier, extruding and centrifuging to prepare a plain blank; and drying and sintering to obtain a finished product. The yttria foamed ceramic filter of the invention can be used for filtering a high-temperature high-activity alloy and has favorable high-temperature strength, thermal stability, thermal shock resistance and high-temperature chemical stability without alloy pollution, favorable capability of filtering impurities in a high-temperature high-activity alloy solution and good filtering and purifying effects.

Description

technical field

[0001] The invention relates to a ceramic foam filter for foundry industry, more particularly, to an yttrium oxide foam ceramic filter which can be used for filtering and purifying high-temperature and high-activity alloy melts. Background technique

[0002] During the metal smelting process, the metal melt easily absorbs gases such as hydrogen and mixes with non-metallic slag, which makes the metal melt and products polluted. During the production process, the melt is refined and left to stand. Although part of the oxidized slag can be removed, a considerable part will remain in the metal melt. At the same time, splashing, turbulence, etc. will inevitably occur during the pouring process. phenomenon, which also leads to the generation of secondary oxidation slag inclusions.

[0003] In this regard, both at home and abroad, the method of foam ceramic filtration is adopted to solve it. By applying the foam ceramic filter, the inclusions in the molten metal c...

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