Preparation method of rapidly sintered porous ceramic

A porous ceramic and rapid sintering technology, which is applied in the field of porous ceramics, can solve problems such as body swelling and cracking, affecting the process of degreasing and debinding, sublimation, evaporation, cracking and detachment processes, etc., so as to improve the bending strength and reduce the firing process. Conditional requirements, effect of promoting adhesion

Active Publication Date: 2021-08-27
杭州陶飞仑新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high temperature and high pressure conditions, additives such as binders used for porous ceramic molding are hindered in their detachment processes such as sublimation, evaporation, cracking, and gasification, which affects the degreasing and debinding process, and in severe cases causes the body to burst.

Method used

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  • Preparation method of rapidly sintered porous ceramic
  • Preparation method of rapidly sintered porous ceramic
  • Preparation method of rapidly sintered porous ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Weigh 1000g particle size D 50 It is silicon carbide of 5 μm, and 85g of fully refined paraffin wax and 50g of aluminum dihydrogen phosphate are added to form a mixture;

[0026] Step 2: Heat the mixture obtained in Step 1 until the paraffin becomes liquid, mix it well with silicon carbide particles and aluminum dihydrogen phosphate, and then cool until the paraffin becomes solid, forming a block solid mixture; pass the block solid mixture through 60 mesh Sieve and granulate to obtain granulated powder;

[0027] Step 3: Fill the granulated powder obtained in Step 2 into the mold cavity, and press the dry powder with a pressure of 55kgf / cm 2 , body size 100mm×100mm×20mm;

[0028] Step 4: Burn the green body gained in step 3, the temperature curve of the firing process (such as figure 1 Shown): from room temperature at a heating rate of 4.5°C / min, heating for 50 minutes to 240°C, and maintaining a constant temperature for 20 minutes; then at a heating rate of 1...

Embodiment 2

[0044] Step 1: Weigh 1000g particle size D 50 120 μm of corundum sand ceramic raw material, and add 350g polyvinyl alcohol (PVA) 1788 aqueous solution (its effective solid content is 10%), 65g boron glass powder (particle size is 20 μm), 50g polyethylene glycol (its effective solid content 20%), 10g lubricant (Luoyang Yefang YF-125, its effective solid content is 40%), forming a mixture;

[0045]Step 2: Add an appropriate amount of deionized water to the mixture obtained in Step 1, and stir it with a mixer until it is fully uniform to form a slurry; then place it in a resistance wire drying oven with a set temperature of 70°C, and dry it for 4 hours to form a solid mixture; The solid mixture is granulated with a 50-mesh sieve, and placed in a closed container for water homogenization treatment, and the water content is controlled within a range of 0.3% to 2.0%;

[0046] Step 3: Fill the granulated powder obtained in Step 2 into the mold cavity, and press the dry powder with a...

Embodiment 3

[0056] Step 1: Weigh 150g particle size D 50 100μm boron carbide (90% boron carbide content), 50g particle size D 50 20 μm boron carbide (boron carbide content is 90%), and add 31.58g propolis gum (effective solid content 38%), 8g aluminum dihydrogen phosphate (concentration 40%), 1.2g sodium citrate, form a mixture;

[0057] Step 2: Add an appropriate amount of distilled water to the mixture obtained in Step 1, stir it with a mixer until it is fully uniform, and then vacuumize it at a room temperature of 10 Pa for 60 minutes to form a slurry;

[0058] Step 3: Introduce the slurry obtained in Step 2 into the gypsum mold cavity for casting, demold and take the green body, dry the green body at 60-90°C for 5-7 hours, and the size of the green body

[0059] Step 4: Burn the green body obtained in Step 3, and use a vacuum furnace to fire, and the temperature curve of the firing process (such as figure 2 As shown): from room temperature at a heating rate of 10°C / min, heating f...

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Abstract

The invention discloses a preparation method of rapidly sintered porous ceramic, which comprises the following steps: 1, weighing a ceramic main material and additives such as an adhesive, and uniformly mixing to form a mixture; 2, treating the mixture obtained in the step 1 to form a solid mixture or slurry; 3, filling a mold cavity with the solid mixture or slurry obtained in the step 2, and forming a green body through dry powder pressing or casting molding; and 4, firing the green body obtained in the 3, setting the firing air pressure to be 10<-3>-10<5> Pa and the temperature to be lower than 1000 DEG C, and thus obtaining the porous ceramic. The air pressure condition of 10<-3 >-10<5> Pa is set in the firing process in the porous ceramic preparation process, so that the firing process is completed within 4 hours at the temperature of lower than 1000 DEG C, the bending strength of the porous ceramic is ensured and even improved while the firing period is shortened, and the oxidation of the main material is inhibited.

Description

technical field [0001] The invention belongs to the technical field of porous ceramics, and in particular relates to a preparation method of rapid sintering porous ceramics. Background technique [0002] Porous ceramic material is a kind of porous ceramic material with opening aperture and high opening porosity, which is made of corundum sand, silicon carbide and other raw materials as main materials, and is prepared through molding and special high-temperature sintering process. Porous ceramic materials have the advantages of high temperature and high pressure resistance, acid, alkali and organic medium corrosion resistance, good biological inertness, controllable pore structure and porosity, long service life, and renewable products. It is usually prepared by extrusion molding, foaming, impregnation, sol-gel, 3D additive printing and other methods, and is widely used in metal smelting filter screens, environmental protection filter carriers, composite materials, refractory...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/64C04B35/638C04B35/565C04B35/10C04B35/48C04B35/563C04B35/584C04B35/52C04B35/634C04B35/632C04B35/63C04B38/00
CPCC04B35/622C04B35/64C04B35/638C04B35/565C04B35/10C04B35/48C04B35/563C04B35/584C04B35/52C04B35/63496C04B35/63416C04B35/632C04B35/6303C04B35/6316C04B35/6309C04B38/00C04B2235/606C04B2235/3418C04B2235/36C04B2235/483C04B2235/447C04B2235/445C04B2235/6581C04B2235/96C04B38/0074
Inventor 王成杨建荣王子超
Owner 杭州陶飞仑新材料有限公司
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