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

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

Inactive Publication Date: 2006-03-22
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, but due to the mixing by stirring, it will inevitably cause gas to be mixed into the slurry, so that air bubbles will be generated in the slurry, which will affect the quality of ceramic products; in addition, this method is difficult to guarantee The uniformity of curing; at the same time, the curing time of this method is longer, ranging from 10 minutes to 1 hour, and the efficiency is not high

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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Effect test

Embodiment 1

[0040] Example 1 Forming of alumina ceramics

[0041] α-Al 2 o 3 It is a commercially available industrial raw material, the diameter of the particles is about 2 μm, and the shape is relatively uniform. Use hydrochloric acid in deionized water to adjust the pH value between 3.5 and 4, 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 a dispersant in deionized water, the pH value is between 5 and 6, add 6Kg of alumina ceramic powder, and 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 due to the adsorption of ammonium citrate, the alumina is negatively charged. The slurry in the two material tanks of A and B is measured 50ml by the diaphragm metering pump, injecte...

Embodiment 2

[0042] Example 2 Forming of alumina ceramics

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

Embodiment 3

[0044] Example 3 Forming of silicon carbide ceramics

[0045] SiC is a commercially available industrial raw material, and the particle diameter is about 0.7 μm. A premix containing 16 wt% of acrylamide monomer and methylenebisacrylamide was prepared with deionized water. The ratio of methylenebisacrylamide to acrylamide is 1:12. Group A powders use the premix to prepare a 55 vol% silicon carbide ceramic thick suspension, and add the catalyst tetramethylethylenediamine at the same time. After 24 hours of ball milling, the viscosity is less than 100 mPa·s. Component B is directly prepared with deionized water to prepare a concentrated suspension of silicon carbide ceramics with a volume fraction of 55vol%. At the same time, add 5g of initiator ammonium persulfate or hydrogen peroxide. After 24 hours of ball milling, the viscosity is less than 150mPa·s. The slurries in the two tanks A and B are respectively metered by diaphragm metering pumps to 350ml, and mixed uniformly with...

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