Preparation method of silicon nitride honeycomb ceramics

A technology of silicon nitride honeycomb and silicon nitride honeycomb, applied in the field of materials, can solve problems such as difficult filtration, and achieve the effects of low density, convenient operation and control, and low equipment requirements

Inactive Publication Date: 2014-10-01
BEIJING CENT FOR PHYSICAL & CHEM ANALYSIS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the pores in the porous bodies and parts prepared in the above documents are closed pores, which are difficult to be used for filtration.

Method used

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  • Preparation method of silicon nitride honeycomb ceramics
  • Preparation method of silicon nitride honeycomb ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1 Extrusion molding prepares silicon nitride honeycomb ceramics and its properties

[0039] Take 200 g of silicon nitride powder with a particle size of 2 μm, 5 g of alumina with a particle size of 3 μm and 15 g of yttrium oxide with a particle size of 2 μm, and mix them uniformly to obtain a powder mixture. Mix water, polyvinyl alcohol and polyglycolic acid in a weight ratio of 70:10:20, stir to obtain a uniform solution, mix the solution with the above powder mixture in a weight ratio of 100:70, and place in the mixing chamber at normal temperature and pressure. Fully knead at room temperature for 0.75 hours in the mixer (BL-6175-B), and age at room temperature and pressure for 3 hours to obtain mud. Filter and purify the sludge through a 60-mesh sieve, extrude a honeycomb biscuit with parallel channels through a honeycomb ceramic extruder (BL-6177), dry at 40°C for 6 hours, and remove the organic matter after drying at 600°C for 2 hours , and then put the...

Embodiment 2

[0041] Example 2 Preparation of Silicon Nitride Honeycomb Ceramics by Gel Casting and Its Properties

[0042] Dissolve monomer acrylamide and cross-linking agent N,N'-methylenebisacrylamide in water, the concentration of monomer acrylamide is 15wt%, and the concentration of cross-linking agent is 0.5wt%, to form a monomer premix solution, in 100ml Add 230g of silicon nitride powder with a particle size of 0.5μm to the monomer premix, add 5.75g of alumina powder with a particle size of 0.3μm and a silicon nitride powder content of 7.5% with a silicon nitride powder content of 2.5% The particle size is 0.1μm yttrium oxide powder 17.25g, the dispersant is ammonium citrate 2g, stir to obtain a ceramic slurry with a solid phase content of about 40%, add catalysts N,N,N',N 25 μl of '-tetramethylethylenediamine, then stir evenly, then add 50 μl of initiator 8% ammonium persulfate solution, stir evenly, pour into the mold immediately, and make a self-made multi-needle hole-forming mol...

Embodiment 3

[0044] Example 3 Preparation of Silicon Nitride Honeycomb Ceramics and Its Properties by Dry Pressing

[0045] Mix 200g of silicon nitride powder with a particle size of 2.5μm, 5g of sintering aid alumina powder with a particle size of 5μm and 15g of yttrium oxide powder with a particle size of 2μm, add alcohol and balls for wet grinding for 24 hours, dry and sieve Finally, add 5wt% paraffin wax based on the sieved material as a forming agent, press the elongated sample (length 10cm, width 5cm, height 5cm) in the steel mold, the pressure is 120MPa, and then press it into the self-made multi-needle hole-forming mold ( Needle φ=2mm, 4 holes / square centimeter) and pulled out to obtain a honeycomb body, put the honeycomb body in a debinding furnace and heat it up to 800°C and keep it warm for 3 hours for dewaxing, then put the dried body into In a multifunctional sintering furnace (HIGH-MUTLI5000), the temperature was raised to 1700 °C at a rate of 10 °C / min, and sintered under a ...

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Abstract

The invention discloses a preparation method of silicon nitride honeycomb ceramics. The preparation method comprises the following steps: 1) preparing silicon nitride honeycomb blank bodies with parallel pore passages; 2) dumping or degreasing the silicon nitride honeycomb blank bodies; and 3) calcining the silicon nitride honeycomb blank bodies to obtain the silicon nitride honeycomb ceramics with pore passage inner wall extending whisker structures. The ceramic matrix part particles prepared by the method are tightly bonded and whiskers grow on the honeycomb pore inner walls. The honeycomb ceramics have the excellent properties such as high strength, low density, high temperature resistance, chemical corrosion resistance and the like and are suitable for filtration and purification of various fluids. According to the used honeycomb ceramics, filtered matters are easily obtained by adopting various methods and the honeycomb ceramics can be reused. The preparation method is simple in process, is low in equipment requirements, is convenient in operation control, has high production efficiency and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a method for preparing silicon nitride honeycomb ceramics with a structure of "whiskers interspersed with parallel channels". Background technique [0002] Honeycomb ceramics have a parallel through-hole pore structure, which has the advantages of high osmotic pressure, large geometric surface, short diffusion distance, which is conducive to the entry of particles and gas discharge, and reduces the filtration volume. It has a wide range of applications in filtration and purification, heat exchange in metallurgical industry and filtration of molten metal, and purification of toxic gases and liquids in mining industry. [0003] Honeycomb ceramics have a special structure of parallel channels. Based on different pore-forming principles, the preparation of honeycomb ceramics mainly includes several methods such as mold extrusion, impregnation and sintering, and freeze-drying. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/622
Inventor 蔡锴邓平晔郭栋范文浩赵瑾
Owner BEIJING CENT FOR PHYSICAL & CHEM ANALYSIS
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