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CN-121974713-A - Ceramic filter and preparation method thereof

CN121974713ACN 121974713 ACN121974713 ACN 121974713ACN-121974713-A

Abstract

The application belongs to the technical field of cast steel, and particularly relates to a ceramic filter and a preparation method thereof, wherein the raw material components of the ceramic filter comprise, by mass, 60-65 parts of monoclinic zirconium powder, 4-6 parts of beryllium stabilizer, 25-35 parts of stabilized zirconium powder containing Y2O3, 2-4 parts of aluminum oxide and 1-3 parts of silicon dioxide, and each 100 parts of the raw material components comprise, by mass, 0.3-0.7 part of dispersing agent, 4-6 parts of thickener, 0.03-0.07 part of polyalcohol, 2-4 parts of sintering aid, 0.03-0.07 part of preservative, 8-12 parts of binder and 8-12 parts of deionized water. The ceramic filter provided by the application aims to solve the problems that in the related art, a zirconia ceramic filter is easy to crack and unstable in performance due to uneven slurry dispersion and lattice mismatch of a traditional magnesium stabilizer.

Inventors

  • WANG JIADONG
  • ZHENG JINPENG
  • SUN ZHIYONG
  • SUN ZHILAN
  • XU CHUANJIAN
  • PAN YUEBAO
  • LUO HAIYUAN
  • WANG LAIMING
  • LIU MENG
  • LUO XIAO

Assignees

  • 潍坊舜得新材料有限公司

Dates

Publication Date
20260505
Application Date
20260209

Claims (10)

  1. 1. A ceramic filter is characterized in that the raw material components of the ceramic filter comprise a dry material component and a wet material component, wherein, The dry material comprises, by mass, 60-65 parts of monoclinic zirconium powder, 4-6 parts of beryllium stabilizer, 25-35 parts of stabilized zirconium powder containing Y 2 O 3 , 2-4 parts of aluminum oxide and 1-3 parts of silicon dioxide per 100 parts of dry material components; The wet material comprises, by mass, 0.3-0.7 part of a dispersing agent, 4-6 parts of a thickening agent, 0.03-0.07 part of a polyol, 2-4 parts of a sintering aid, 0.03-0.07 part of a preservative, 8-12 parts of a binder and 8-12 parts of deionized water.
  2. 2. The ceramic filter of claim 1, wherein the monoclinic zirconium powder comprises 100 mesh monoclinic zirconium powder, 200 mesh monoclinic zirconium powder, 300 mesh monoclinic zirconium powder and 1000 mesh monoclinic zirconium powder, wherein the mass ratio of the 100 mesh monoclinic zirconium powder, the 200 mesh monoclinic zirconium powder, the 300 mesh monoclinic zirconium powder and the 1000 mesh monoclinic zirconium powder is (4-6): (12-18): (18-22): (18-22).
  3. 3. The ceramic filter of claim 1, wherein the beryllium-based stabilizer comprises at least one of beryllium oxide or beryllium carbonate.
  4. 4. The ceramic filter of claim 1, wherein the beryllium-based stabilizer has a particle size of 40-60nm.
  5. 5. The ceramic filter according to claim 1, wherein the dispersant is an ammonium polyacrylate dispersant, and the pH is adjusted in the range of 5 to 11.
  6. 6. The ceramic filter of claim 1, wherein the thickener comprises a xanthan-type thickener having a viscosity of at least 1200 mPa-s.
  7. 7. The ceramic filter of claim 1, wherein the binder comprises an aqueous acrylic adhesive having a solids content of 8-12%.
  8. 8. A method of making a ceramic filter according to any one of claims 1 to 7, comprising: s1, preparing slurry, namely mixing a dry material component and a wet material component to obtain injection molding slurry; S2, injection molding, namely injecting the injection molding slurry into a mold to form a blank; And S3, sintering the green body in a gradient manner to obtain the filter.
  9. 9. The method of preparing according to claim 8, wherein the gradient sintering comprises: (1) A first low-temperature stage of heat treatment in a temperature range of 0-450 ℃; (2) A second medium temperature stage, namely performing heat treatment in a temperature range of 450-1100 ℃; (3) And a third high-temperature stage, wherein heat treatment is carried out in the temperature range of 1100-1600 ℃.
  10. 10. The method according to claim 9, wherein the temperature rise rate in the gradient sintering process is 10 ℃ per minute from room temperature to 600 ℃ and 50 ℃ per minute from 600 ℃ to 1600 ℃.

Description

Ceramic filter and preparation method thereof Technical Field The invention belongs to the technical field of cast steel, and particularly relates to a ceramic filter and a preparation method thereof. Background In the cast steel process, zirconia ceramic filters are widely used for filtering high temperature molten metal (> 1500 ℃) due to their excellent high temperature stability. However, in practical preparation, on the one hand, zirconia powder is easy to agglomerate, so that the slurry viscosity is high (> 1200 mPa s), the green body density is uneven after injection molding, and the quality of a final sintered body is affected. On the other hand, zirconia undergoes a monoclinic to tetragonal phase transformation during sintering (about 1170 ℃) with a volume expansion of about 4.3%, creating a tremendous stress. The magnesium oxide (MgO) stabilizer adopted in the prior art has limited effect of inhibiting phase change stress due to lattice mismatch (MgO lattice constant is 4.21A and ZrO 2 is 4.23A), so that the crack density in the final product is higher (> 5 strips/cm), and the strength and thermal shock performance of the filter are reduced. Therefore, development of a novel zirconia ceramic filter and a method for preparing the same are needed to solve the problems of poor slurry dispersibility and easy cracking during sintering. Disclosure of Invention The present application aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present application is to provide a ceramic filter and a method for preparing the same, which aims to solve the problems of the zirconia ceramic filter in the related art that the sintered body is easy to crack and the performance is unstable due to uneven dispersion of slurry and lattice mismatch of the traditional magnesium stabilizer. In a first aspect of the invention, the invention proposes a ceramic filter, according to an embodiment of the invention, the raw material components of which comprise a dry material component and a wet material component, wherein, The dry material comprises, by mass, 60-65 parts of monoclinic zirconium powder, 4-6 parts of beryllium stabilizer, 25-35 parts of stabilized zirconium powder containing Y 2O3, 2-4 parts of aluminum oxide and 1-3 parts of silicon dioxide per 100 parts of dry material components; The wet material comprises, by mass, 0.3-0.7 part of a dispersing agent, 4-6 parts of a thickening agent, 0.03-0.07 part of a polyol, 2-4 parts of a sintering aid, 0.03-0.07 part of a preservative, 8-12 parts of a binder and 8-12 parts of deionized water. According to the ceramic filter, the beryllium stabilizer (Be2+ ion radius is 0.27A) is introduced into the dry material component to replace the traditional magnesium stabilizer (Mg2+ ion radius is 0.72A), so that the matching performance with zirconia crystal lattice (Zr 4 + ion radius is 0.72A) can Be improved, the volume expansion stress in the monoclinic phase-to-tetragonal phase conversion process is effectively restrained, and meanwhile, stable zirconium powder containing Y 2O3, alumina, silicon dioxide and other auxiliary components are matched, so that the crystal phase evolution and densification behavior in the sintering process are further regulated. The dispersant and the thickener in the wet material component act synergistically, so that the rheological property and particle dispersion uniformity of the slurry are improved, and the consistency of the blank forming density is ensured. The formula system remarkably improves the bending strength and the thermal shock stability of the filter and realizes the unification of the structural integrity and the filtering function on the premise of keeping proper porosity through the lattice adaptation of the ion scale and the process regulation of the macro scale. In some embodiments of the invention, the monoclinic zirconium powder comprises 100 mesh monoclinic zirconium powder, 200 mesh monoclinic zirconium powder, 300 mesh monoclinic zirconium powder and 1000 mesh monoclinic zirconium powder, wherein the mass ratio of the 100 mesh monoclinic zirconium powder, the 200 mesh monoclinic zirconium powder, the 300 mesh monoclinic zirconium powder and the 1000 mesh monoclinic zirconium powder is (4-6): (12-18): (18-22): (18-22). Thereby the processing time of the product is reduced, In some embodiments of the invention, the beryllium-based stabilizer comprises at least one of beryllium oxide or beryllium carbonate. In some embodiments of the invention, the beryllium-based stabilizer has a particle size of 40-60nm. In some embodiments of the invention, the dispersant is an ammonium polyacrylate dispersant, with a pH adjustment range of 5-11. In some embodiments of the invention, the thickener comprises a xanthan-type thickener having a viscosity of ≡1200mPa ≡s. In some embodiments of the invention, the binder comprises an aqueous acrylic adhesive having a solids content of 8