Formation technology for preparation of porous or compact material with gel-casting of alcohol-water basic material slurry

A gel injection molding, alcohol water-based technology, applied in the direction of manufacturing tools, ceramic molding machines, etc., can solve the problems of unevenness, poor shape retention of products, small shrinkage deformation, etc., to achieve uniform pore distribution, poor shape retention, and size consistent effect

Active Publication Date: 2013-11-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the water-based gel injection molding process in the prior art. The shrinkage during drying and sintering is large and uneven, the shape retention of the product is poor, and it is easy to crack, especially when the solid content of the slurry is low, while the alcohol-based ceramic material The porosity of porous ceramics prepared by gel injection molding is low, and the pore size and distribution are not easy to control and other defects. The purpose is to provide a molding process for preparing porous or dense materials by gel injection mo

Method used

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  • Formation technology for preparation of porous or compact material with gel-casting of alcohol-water basic material slurry
  • Formation technology for preparation of porous or compact material with gel-casting of alcohol-water basic material slurry
  • Formation technology for preparation of porous or compact material with gel-casting of alcohol-water basic material slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0032] (1) Prepare 100 g of a mixed solvent with a volume ratio of ethanol-water of 94:6, and prepare a premixed solution with 15 g of acrylamide monomer and 0.3 g of N,N'-methylenebisacrylamide binder.

[0033] (2) Add 75g of 99 alumina ceramic powder (0.3~1.5μm) (solid content is 15%) and 0.6wt% polyacrylamide dispersant to the premixed solution, and adjust the pH of the system to 10 with ammonia water at the same time. The planetary ball mill was milled for 6 hours, and the speed of the ball mill was 200r / min.

[0034] (3) Remove air bubbles from the ball-milled mixture, add initiator ammonium persulfate and catalyst tetramethylethylenediamine, stir evenly, pour it into a mold and let it stand for 20-40 minutes to obtain a wet green body with a certain strength.

[0035] (4) Take out the wet green body after shaping, put it into the drying room to heat up, and at the same time blow in hot air to dry it, start from 50°C at a rate of 0.2°C / heating to 120°C, for a total of abo...

Embodiment example 2

[0040] Prepare 100g of ethylene glycol-water mixed solvent with a volume ratio of 6:4, and prepare a premix solution with 15g of acrylamide monomer and 0.3g of N,N'-methylenebisacrylamide binder. Others are basically consistent with Embodiment 1. Just replace and dry the wet green body in absolute ethanol for 12 hours, remove most of the moisture in the green body, take it out after setting the shape, put it in the drying room to heat up, and at the same time blow in hot air to dry, starting from 50°C at a rate of 0.2°C / heating to 120°C for about 6-8 hours in total to obtain a dry ceramic body.

[0041] The SEM microstructure of the alumina porous ceramics prepared using this implementation case is as follows: image 3 As shown, compared with the sintered body in Embodiment 1, the richness of the pores is slightly reduced, the pore size distribution is uniform, and the size is uniform, but the pore size is smaller than that of Embodiment 1.

[0042] The performance test of t...

Embodiment example 3

[0044] Prepare 100g of a glycerol-water mixed solvent with a volume ratio of 4:6, and prepare a premix solution with 15g of acrylamide monomer and 0.3g of N,N'-methylenebisacrylamide binder. Others are consistent with Embodiment 2.

[0045] The SEM microstructure of the alumina porous ceramics prepared using this implementation case is as follows: Figure 4 As shown, compared with the sintered body in Embodiment 1, the richness of the pores is reduced, the pore size distribution is uniform, and the size is uniform, but the pore size is smaller than that of Embodiment 2.

[0046] Performance tests were performed on the alumina porous ceramics prepared in this embodiment, the porosity was 57.97%, and the bulk density was 1.67g / cm 3 , The bending strength is 20.55Mpa.

[0047] From examples 1 to 3, it can be seen that with the decrease of the alcohol content, the porosity decreases, the bulk density increases, and the bending strength increases greatly.

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Abstract

The invention discloses a formation technology for preparation of porous or compact material with gel-casting of alcohol-water basic material slurry, which comprises the following steps: adding polymerized monomer and cross-linking agent to alcohol-water mixed solvent to premix to mixed solution, and dispersing ceramic powders or powder metallurgy powders in the obtained mixed solution through dispersing agent to prepare ceramic or powder metallurgy slurry; injecting the obtained ceramic or powder metallurgy slurry into a mould, and demoulding after solidification to obtain a wet body; conducting slowly heating up drying for the obtained wet body to obtain a dry body; and glue removing and sintering the dry body to obtain porous or compact ceramic or powder metallurgy material. According to the technology, the dry body with small shrinkage distortion and accurate size is obtained through the control for the alcohol-water ratio of the alcohol-water mixed solvent to prepare the wet body and then the combination of a special method to dry the wet body; the glue removing and the sintering can be conducted through a conventional method; the porous or compact ceramic or powder metallurgy material is prepared through the ceramic or powder metallurgy slurry cable of adapting to different solid content; the prepared porous or compact ceramic or powder metallurgy material has the advantages of uniform distribution, high bending-resistant and compressive strength, good repeatability, low cost, and the like, and facilitates the industrial production.

Description

technical field [0001] The invention relates to a molding process for preparing porous or dense materials by gel injection molding of alcohol-water base slurry, and belongs to the field of ceramic and powder metallurgy manufacturing. Background technique [0002] The gel injection molding process is a new type of wet ceramic molding process invented by the Oak Ridge National Laboratory in the 1990s. It uses the polymer network to produce situ polymerization, so that the ceramic particles are agglomerated and formed. A production method, by using a polymerizable organic monomer (water-based) in a suspension with a high solid powder content, adding an initiator and a catalyst, so that the slurry is polymerized and solidified shortly after pouring, due to this special molding mechanism system Containing only a small amount of coupling agent, the slurry has a high solids content and the blank is strong enough to be machined and polished. It can prepare workpieces with complex s...

Claims

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Application Information

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IPC IPC(8): B28B1/14B28B1/50B22F3/22B22F3/11
Inventor 李国栋霍凌霞刘靖忠彭俊
Owner CENT SOUTH UNIV
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