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Preparation method of boride porous ceramics

A technology of porous ceramics and boride, applied in the field of preparation of boride porous ceramics, can solve the problems of low strength, stress concentration, high production cost, and achieve the effects of uniform distribution, uniform density and high yield.

Inactive Publication Date: 2011-11-30
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the production process and technology, the produced boride porous ceramics have uneven pore size and density distribution, low strength and high production cost, and are prone to stress concentration during use, resulting in cracking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The steps are:

[0016] 1. Preparation of ceramic powder: prepared by uniformly mixing 1:1 hafnium boride-silicon nitride powder with a particle size of 0.5 μm.

[0017] 2. Prepare a mixed organic solution: dissolve the organic monomer prepared by mixing N,N-methylene acrylamide and acrylamide at a ratio of 2:98 by weight into water, and the ratio by weight of the organic monomer to water is 5:95. Prepare the organic solution, then mix the organic solution with the ammonium polyacrylate solution dispersant with a concentration of 40wt% in a weight ratio of 9:1, and then adjust the pH value of the mixed solution to 9 with the ammonia water with a concentration of 50wt%. mixed organic solutions.

[0018] 3. Preparation of suspended ceramic slurry: mix the ceramic powder obtained in step 1 with the mixed organic solution prepared in step 2 according to a weight ratio of 4:1, add ball stones and grind, then vacuum treat until no bubbles escape in the slurry. out to make a...

Embodiment 2

[0025] The steps are:

[0026] 1. Preparation of ceramic powder: prepared by uniformly mixing 1:1 hafnium boride-silicon carbide powder with a particle size of 2 μm.

[0027] 2. Prepare a mixed organic solution: dissolve the organic monomer prepared by mixing N,N-methylene acrylamide and acrylamide at a weight percentage of 5:95 into water, and the weight ratio of the organic monomer to water is 1:4. Prepare the organic solution, and then mix the organic solution with the ammonium polyacrylate solution dispersant with a concentration of 60wt% at a weight percentage of 97:3, then adjust the pH value of the mixed solution to 10 with the ammonia water with a concentration of 60wt%, and then prepare mixed organic solution.

[0028] 3. Preparation of suspended ceramic slurry: mix the ceramic powder obtained in step 1 with the mixed organic solution prepared in step 2 according to a weight ratio of 7:3, add ball stones and grind, then vacuum treat until there are no air bubbles in ...

Embodiment 3

[0035] The steps are:

[0036] 1. Preparation of ceramic powder: prepared by uniformly mixing 1:1 zirconium boride-silicon nitride powder with a particle size of 5 μm.

[0037] 2. Prepare a mixed organic solution: dissolve the organic monomer obtained by mixing N, N-methylene acrylamide and acrylamide at a weight percentage of 10:90 into water, and the weight percentage of the organic monomer and water is 70:30, Prepare the organic solution, then mix the organic solution with the ammonium polyacrylate solution dispersant with a concentration of 20wt% in a weight percentage of 85:15, then adjust the pH value of the mixed solution to 11 with the ammonia water of 40wt% with a concentration, that is, to prepare mixed organic solutions.

[0038] 3. Preparation of suspended ceramic slurry: mix the ceramic powder obtained in step 1 with the mixed organic solution prepared in step 2 according to a weight ratio of 17:3, add ball stones and grind, then vacuum treat until no bubbles esc...

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PUM

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Abstract

The invention provides a preparation method of boride porous ceramics, which includes the preparation, foaming, molding and firing of suspended ceramic slurry, which is characterized in that: adding a certain amount of foaming agent to the prepared suspended ceramic slurry in a nitrogen environment Stir vigorously for a certain period of time to form bubbles with a diameter of 5 to 600 μm, then add an initiator and catalyst and continue stirring for 0.5 to 3 minutes to obtain a porous slurry, inject the porous slurry into a non-absorbent mold, and place it at room temperature under nitrogen protection for 1 minute to 48 hours, and then at a temperature of 60 to 150°C for 10 minutes to 6 hours to solidify and form, then demould and dry to make the moisture content of the green body lower than 0.5wt%, degrease the dried green body, and fired under conditions. Because the ceramic powder is evenly distributed in the suspended ceramic slurry, and the special foaming principle is adopted, the porous slurry prepared has many bubbles and the size and distribution are uniform. The microstructure of the boride porous ceramic body made of it , uniform density, high yield of boride porous ceramics.

Description

technical field [0001] The invention relates to a preparation method of boride porous ceramics, belonging to the technical field of porous ceramics preparation. Background technique [0002] Traditional porous ceramics are produced by traditional production methods such as grouting, extrusion, ramming and isostatic pressing, and porous ceramics are prepared by particle accumulation and adding pore enhancers. Due to the limitations of the production process and technology, the produced boride porous ceramics have uneven pore size and density distribution, low strength and high production cost, and are prone to stress concentration during use, resulting in cracking. Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing boride porous ceramics that can overcome the above-mentioned defects, produce porous ceramics with uniform pore size distribution, low production cost, and excellent product performance. The technical solu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622C04B38/02
Inventor 唐竹兴田贵山
Owner SHANDONG UNIV OF TECH