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Mold-injecting and forming method of high-solid-phase contents

A technology of injection molding and solid phase content, applied in ceramic molding machines, manufacturing tools, etc., can solve problems such as large shrinkage, consumption of flocculant, waste liquid pollution, etc.

Inactive Publication Date: 2012-07-04
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this method: (1) Consumption of flocculant; (2) Press filtration or centrifugal operation will produce waste liquid pollution;
[0008] The main purpose of the present invention is to overcome the shortcomings of the original in-situ solidification molding method, such as large shrinkage rate or waste liquid pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The first step: take the formula of a certain ceramic floor tile as an example: kaolin 490g, quartz 326g, feldspar 184g, dispersant 4g, water 500g, ball mill in a drum mill for 24 hours to obtain a liquid material (here the liquid material is The raw and auxiliary materials are dispersed in the liquid dispersion medium and made); the apparent viscosity of the liquid material is 19 mPas as measured by the NDJ-1 type rotational viscometer, and the median particle diameter D of the particles is measured by the laser particle size analyzer. 50 = 2.86 microns. Take 900 g of the liquid material, place it in an electric oven, dry it at 90° C. for 12 hours, and crush it until all of it passes through an 80-mesh sieve to obtain a powder-shaped solid material with a water content of 6.3 wt%.

[0020] Step 2: Place the steel mold with an inner cavity of 100x20x30mm on the vibration table of the NLB-3 cement fluidity tester, inject 15g of liquid material into the cavity of the mold...

Embodiment 2

[0025] Step 1: Take the formula of a certain impact-resistant alumina lining brick as an example: high-temperature alumina 900g, kaolin 45g, talc powder 23g, dolomite 29g, dispersant 4g, water 450g, after ball milling for 36 hours, add 50g polyethylene Alcoholic solution (3.5wt%) is as liquid material, and apparent viscosity is 15 mPas, and median diameter D 50 = 2.29 microns. Take out 700g from the liquid material, put it in an oven and dry it at 90°C for 8 hours, and crush it until it passes through an 80-mesh sieve to obtain a powder-shaped solid material with a moisture content of 2.6wt%.

[0026] Step 2: Place a steel mold with an inner cavity of 100x20x30mm on a vibrating table, inject 3g of liquid material into the mold while vibrating, and then sprinkle 1g of solid material; then inject 3g of liquid material, and then sprinkle 1g of solid material In this way, the liquid material and the solid material are added 20 times in turn, and the material is filled in the mold...

Embodiment 3

[0031] Step 1: Take the formula of a wear-resistant and erosion-resistant silicon nitride ceramic as an example: 430g silicon nitride powder, 40g high-temperature alumina, 30g yttrium oxide, 2g dispersant, 220g water, after ball milling for 32 hours, add 25g Polyvinyl alcohol solution (3.5wt%) makes liquid material, and apparent viscosity is 13 mPas, median diameter D 50 = 1.34 microns. Take out 300 g from the liquid material, dry at 90° C. for 8 hours, and crush until all pass through an 80-mesh sieve to obtain a powdery solid material with a moisture content of 2.1 wt%.

[0032] Step 2: Place a steel mold with an inner cavity of 100x20x30mm on a vibrating table, inject 3g of liquid material into the mold cavity while vibrating, and then sprinkle 1g of solid material; then inject 3g of liquid material, and then sprinkle 1g Solid material: Alternately add liquid material and solid material 20 times in this way, the material is semi-solid in the mold that is not easy to flow, ...

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Abstract

The invention relates to a method for obtaining a blank by injecting a liquid material containing a continuous liquid phase and a granular or a powdered solid material without the continuous liquid phase in a forming mold, mixing the liquid material and the solid material and then solidifying and demolding. The mold-injecting and forming method of high-solid-phase contents belongs to the field offorming and preparing of ceramic base materials, overcomes the defects of great shrinkage rate and low compactness of the traditional in-situ solidifying and forming method and ensures that the size of the dried blank approaches to the size of a hollow mold cavity. The method approximately comprises the following technical routes of: processing various raw and auxiliary materials needed for a product into two parts in different modes, i.e. a part is the liquid material containing the continuous liquid phase and the other part is the solid material without the continuous liquid phase; quantificationally adding the liquid material and the solid material which are prepared in the last step to the hollow mold cavity; evenly mixing the materials till the mixture is distributed in the mold in ahardly-flowing semi-solid mode; enabling the mixture to form a compact solid with enough rigidity through the evaporation or crosslinking solidification action; and then demolding and drying to obtain the blank.

Description

technical field [0001] The invention relates to an injection molding method with high solid phase content, and belongs to the field of preparation of ceramic-based materials and products thereof. Background technique [0002] The forming of ceramics is to make the raw and auxiliary materials with powder as the main body into a green body with the required size and shape and certain rigidity. In order to avoid excessive shrinkage of the green body during drying and sintering, the density of the formed green body should be as high as possible. Two tasks must be completed in forming: (1) densification, so that the particles in the powder are as close as possible to each other to form a compact body; (2) finalization: to make the compact body have the required geometric shape. [0003] The original molding method can be divided into two categories according to the order of densification and finalization: the first type is the simultaneous completion of densification and finaliz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/14
Inventor 丁锐杨富贵李成峰
Owner SHANDONG UNIV OF TECH