Yttria foamed ceramic filter and preparation method thereof

A technology of foam ceramics and filters, applied in chemical instruments and methods, ceramic products, filtration and separation, etc., can solve problems such as difficult to meet the requirements of filtration, achieve good filtration ability, good effect, and avoid broken effects

Inactive Publication Date: 2011-04-06
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when filtering Nb alloys, Ti alloys, rare earth alloys, and alloys containing highly active metals such as Ti, Al, Nb, Hf, and rare earth elements (such as Y, Tb, Dy), due to the high temperature chemical stability of foamed ceramic materials, etc. The performance requirements are high, and the foam ceramic filter made of existing materials is easy to react with these high-temperature and high-activity alloys, and it is difficult to meet the requirements of filtration.

Method used

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  • Yttria foamed ceramic filter and preparation method thereof
  • Yttria foamed ceramic filter and preparation method thereof
  • Yttria foamed ceramic filter and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Step 1. Preparation of component A ceramic slurry

[0066] 500g of yttrium oxide with a particle size of 47 μm, 5g of polyvinyl alcohol and 100g of deionized water were stirred and mixed evenly to obtain component A ceramic slurry;

[0067] Step 2. Preparation of component B ceramic slurry

[0068] 330g of yttrium oxide with a particle size of 47 μm, 5g of polyvinyl alcohol and 100g of deionized water were stirred and mixed evenly to obtain component B ceramic slurry;

[0069] Step 3: Make foam template

[0070] Soak the polyurethane foam with a size of 45mm×45mm×20mm and a pore diameter of 10PPI in ammonia water with a pH value of 10 and a temperature of 45°C for 2 hours, then take it out, rinse it repeatedly with clean water, and wash off the ammonia water present in the polyurethane foam. After drying, a foam template is obtained;

[0071] Step 4, pulping and drying

[0072] (A) Immerse the foam formwork prepared in step 3 into the component A ceramic slurry prep...

Embodiment 2

[0084] Step 1. Preparation of component A ceramic slurry

[0085] 348g of yttrium oxide with a particle size of 47μm, 116g of yttrium oxide with a particle size of 20μm, 116g of yttrium oxide with a particle size of 5μm, 3.6g of carboxymethyl cellulose, 36.4g of zirconia, 6.3g of ammonium polyacrylate and 100g of deionized After the water is stirred and mixed evenly, the A-component ceramic slurry is obtained;

[0086] Step 2. Preparation of component B ceramic slurry

[0087] 180g of yttrium oxide with a particle size of 30μm, 60g of yttrium oxide with a particle size of 20μm, 60g of yttrium oxide with a particle size of 5μm, 3.6g of carboxymethyl cellulose, 18.2g of zirconia, 3.6g of ammonium polyacrylate and 100g of deionized After the water is stirred and mixed evenly, the B component ceramic slurry is obtained;

[0088] Step 3: Make foam template

[0089] Soak the polyurethane foam with a size of Ф24mm×12mm and a pore diameter of 20PPI in a sodium hydroxide solution wi...

Embodiment 3

[0103] Step 1. Preparation of component A ceramic slurry

[0104] 380g of yttrium oxide with a particle size of 47μm, 190g of yttrium oxide with a particle size of 5μm, 5.6g of polyvinyl alcohol, 44.5g of aluminum oxide, 4.4g of polyammonium methacrylate and 100g of deionized water were mixed evenly to obtain component A Ceramic slurry;

[0105] Step 2. Preparation of component B ceramic slurry

[0106] 140g of yttrium oxide with a particle size of 47μm, 70g of yttrium oxide with a particle size of 5μm, 5.6g of polyvinyl alcohol, 11g of alumina, 2.2g of polyammonium methacrylate and 100g of deionized water were mixed evenly to obtain component B ceramics slurry;

[0107] Step 3: Make foam template

[0108] Soak the polyurethane foam with a size of 38mm×38mm×15mm and a pore diameter of 15PPI in a sodium hydroxide solution with a mass percentage concentration of 15% at a temperature of 50°C for 3 hours, take it out, rinse it repeatedly with clean water, and wash off the polyu...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/20C04B35/505C04B38/08
Inventor 唐晓霞罗德映张虎
Owner BEIHANG UNIV
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