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Gel casting method of zirconia ceramic

A technology of gel injection molding and zirconia ceramics, which is applied in the field of ceramic material molding, can solve the problems that air bubbles cannot be completely eliminated, affect the preparation of high-density products, and cannot solve the problems of oxygen inhibition, etc., and achieve high cost performance, increase density, increase The effect of connection

Pending Publication Date: 2020-11-10
苏州炻原新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxygen inhibition will not only lead to a non-condensing layer on the surface of the product, because the air bubbles inside the slurry cannot be completely eliminated, but also form pores due to oxygen inhibition during shrinkage, which will affect the preparation of high-density products
Although some researchers suggest injection molding in an inert atmosphere, it can only suppress the oxygen inhibition on the surface, and cannot solve the problem of oxygen inhibition caused by the presence of oxygen inside the slurry

Method used

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  • Gel casting method of zirconia ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: A gel injection molding method of zirconia ceramics, comprising the following steps:

[0034] Step 1. Add 10g of B ester to the reaction device with a condensing reflux device and a stirrer, heat it to (50±2)°C while stirring, and then keep it warm; slowly add 50g of acrylamide to the B ester, wait After the acrylamide is completely dissolved, add 0.25g p-methoxyphenol and stir evenly;

[0035] Step 2, using ammonia water to adjust the pH value of the solution to 9.5;

[0036] Step 3, slowly add 65g of paraformaldehyde to the solution, and add triethylamine to control the pH value of the solution to 9.5, and continue to stir for 120 minutes;

[0037] Step 4, filter the solution, and cool the filtrate to below 25°C;

[0038] Step 5, using centrifugation to separate the crystals precipitated in the filtrate after cooling;

[0039] Step 6: Take 40 g of crystals obtained by centrifugation, 300 g of deionized water, 10 g of ammonium polyacrylate as a dispers...

Embodiment 2

[0049] Embodiment 2: A gel injection molding method of zirconia ceramics, comprising the following steps:

[0050] Step one to step five are the same as embodiment 1;

[0051] Step 6. Take 30g of crystals obtained by centrifugation, 280g of deionized water, 0.15g of N,N-methylenebisacrylamide, 20g of ammonium polyacrylate as a dispersant, 1g of n-octanol and 1g of acetylene glycol as a defoaming agent, mix and stir Uniform, prepared into a premix;

[0052] Step 7. Add the premixed liquid into the ball mill tank, and gradually add 2000 g of nano-zirconia powder with a D50 of 0.4um. After the powder is added, ball mill until there is no powder agglomerated particles in the slurry, and the relative content of organic matter is 1.5%. A slurry with a solid phase volume content of 49%; the viscosity of the slurry is 287mpa s, which meets the requirements of the gel injection molding process;

[0053] Step 8. Transfer the ball-milled slurry to a vacuum tank, and stir and degas for ...

Embodiment 3

[0059] Embodiment 3: a kind of gel injection molding method of zirconia ceramics, comprising the following steps:

[0060] Step one to step five are the same as embodiment 1;

[0061] Step 6: Take 20g of crystals obtained by centrifugation, mix with 260g of deionized water, 0.2g of N,N-methylenebisacrylamide, 30g of ammonium polyacrylate as a dispersant, and 1g each of n-octanol and acetylenic diol as a defoaming agent and mix them. Stir evenly to make a premix;

[0062] Step 7. Add the premixed solution into the ball mill tank, and gradually add 2000 g of nano-zirconia powder with a D50 of 0.5um. After the powder is added, ball mill until there is no powder agglomerated particles in the slurry, and the relative content of organic matter is 1%. A slurry with a solid phase volume content of 50%; the viscosity of the slurry is 430mpa s, which meets the requirements of the gel injection molding process;

[0063] Step 8. Transfer the ball-milled slurry to a vacuum tank, and stir...

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Abstract

The invention provides a gel casting method of zirconia ceramic, which comprises the following steps: modifying acrylamide by using B grease, formaldehyde and the like to enhance the solid content ofthe slurry, and adding hydroquinone into the slurry to eliminate oxygen in the slurry, thereby eliminating oxygen inhibition in the green body. By adopting the method provided by the invention, the zirconia ceramic with the relative density higher than 99.5% can be prepared.

Description

technical field [0001] The invention relates to a gel injection molding method for zirconia ceramics, belonging to the technical field of ceramic material molding. Background technique [0002] Zirconia is the first choice for the preparation of high-performance structural ceramics due to its high strength and toughness. However, the properties of zirconia, especially the mechanical properties, are often directly proportional to its density. In order to exert the excellent mechanical properties of zirconia, its relative density often needs to reach 99% or more of the theoretical density. At present, the preparation of high-density zirconia ceramics is generally made of nano-zirconia powder with high sintering activity, which is formed by isostatic pressing to prepare a high-density green body, and then sintered at high temperature. Although zirconia ceramics with a relative density of 99% can be prepared by isostatic pressing, there are also disadvantages such as large equ...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/622C04B35/624C04B35/632C04B35/634
CPCC04B35/48C04B35/622C04B35/624C04B35/632C04B35/63444C04B2235/6022C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77C04B2235/5445
Inventor 李飞
Owner 苏州炻原新材料科技有限公司
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