Cermic Sizing material fast and controllable solidfying colloied state shaping method and device

A ceramic slurry and molding method technology, which is applied in ceramic molding machines, chemical instruments and methods, cement mixing devices, etc., can solve the problems of long curing time, slurry curing, and uncured, and achieve short curing time and uniform curing , the effect of a high level of automation

Inactive Publication Date: 2004-07-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature reaches the critical point of solidification, local first solidification will occur inside the suspension, which causes two problems: the slurry may solidify before being injected into the mold, or it may not solidify for a long time after being injected into the mold , or cure in the mold for a longer period of time
This method realizes the controllability of the curing process

Method used

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  • Cermic Sizing material fast and controllable solidfying colloied state shaping method and device
  • Cermic Sizing material fast and controllable solidfying colloied state shaping method and device

Examples

Experimental program
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Example Embodiment

[0040] Example 1 Molding of alumina ceramics

[0041] α-Al 2 O 3 It is a commercially available industrial raw material with a particle diameter of about 2μm and a relatively uniform shape. Adjust the pH value between 3.5 and 4 with hydrochloric acid in deionized water, add 6Kg of alumina ceramic powder, and after ball milling for 24 hours, prepare a suspension with a viscosity of 280mPa·s and a volume fraction of 60%, and place it in material A In the tank, the alumina is now positively charged. Use ammonium citrate as dispersant in deionized water, pH value between 5-6, add alumina ceramic powder 6Kg, after ball milling for 24 hours, prepare a suspension with a viscosity of 200mPa·s and a volume fraction of 60% , Placed in the B material tank, at this time the alumina is negatively charged due to the adsorption of ammonium citrate. The slurry in the two tanks A and B are respectively measured 50ml through a diaphragm metering pump, and injected into the static mixer through an 8...

Example Embodiment

[0042] Example 2 Molding of alumina ceramics

[0043] α-Al 2 O 3 It is a commercially available industrial raw material with a particle diameter of about 0.5 μm and a spherical shape. Adjust the pH to between 3.5 and 4 with hydrochloric acid in 1000ml of deionized water, add 6Kg of alumina ceramic powder and 5g of 0.4mmol / l calcium chloride electrolyte, and after ball milling for 24 hours, the viscosity will be 360mPa·s. The suspension with a volume fraction of 60% is placed in the A tank, where the alumina is positively charged. Use 5g of ammonium citrate as a dispersant in 1000ml of deionized water, pH value between 5-6, add alumina ceramic powder 6Kg and 0.4mmol / l ammonium sulfate electrolyte 5g, after ball milling for 24 hours, the viscosity is A suspension of 300 mPa·s and a volume fraction of 60% is placed in the B material tank. At this time, the alumina is negatively charged due to the adsorption of ammonium citrate. The slurry in the two tanks A and B are respectively mea...

Example Embodiment

[0044] Example 3 Molding of silicon carbide ceramic

[0045] SiC is a commercially available industrial raw material, and the particle diameter is about 0.7 μm. A premix containing 16wt% of acrylamide monomer and methylenebisacrylamide was prepared with deionized water. The ratio of methylene bisacrylamide to acrylamide is 1:12. The powders of group A are prepared by using the premixed liquid to prepare a concentrated suspension of silicon carbide ceramics with a volume fraction of 55 vol%, and a catalyst tetramethylethylenediamine is added at the same time. After ball milling for 24 hours, the viscosity is less than 100 mPa·s. Component B is directly prepared with deionized water with 55vol% volume fraction of silicon carbide ceramic concentrated suspension, while adding initiator ammonium persulfate or hydrogen peroxide 5g, after ball milling for 24 hours, the viscosity is less than 150mPa·s. The slurry in the two tanks A and B are respectively measured by a diaphragm metering p...

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Abstract

A process and apparatus for controllable fast solidification of shaped colloidal ceramics are disclosed. Said apparatus is composed of two vacuum storage tanks for different ceramic slurries, mixing system, diaphragm-type metering unit, high-pressure opposite jetting mixer, static mier, and mould. Said process includes stirring two ceramics slurries in vacuum state respectively, fostly injecting them in static mixer, high-pressure opposite jetting mixing, injecting in vacuum mould, and fast reaction and solidification. Its advantages are uniform solidifying and no internal stress.

Description

technical field [0001] The invention belongs to the ceramic molding technology, and in particular relates to a rapid and controllable solidification colloidal molding method and device for ceramic slurry that utilizes the different characteristics of suspensions of various components to quickly react and solidify and mold under vacuum conditions. Background technique [0002] The preparation process of high-performance ceramic materials and components is the premise of the development and application of ceramic materials. The molding process plays a connecting role in the entire preparation process of ceramic materials. It is the key to ensuring the reliability, yield and repeatability of ceramic materials and components, and is directly related to industrialization and large-scale production. After entering the 1990s, focusing on improving the uniformity of the ceramic body and solving the reliability of ceramic materials, the colloidal in-situ solidification molding proces...

Claims

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Application Information

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IPC IPC(8): B28B1/26B28C5/00C04B35/622C04B35/624C04B35/626C04B35/63
Inventor 杨金龙黄勇马天席小庆
Owner TSINGHUA UNIV
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