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Testing method of ceramic suspended matter gelating point and device

A test method and test device technology, applied in the investigation stage/state change, etc., can solve problems such as cracking, affecting the uniformity and reliability of the green body and sintered body

Inactive Publication Date: 2004-05-05
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existence of temperature gradient will lead to uneven solidification and internal stress inside the green body, which will affect the uniformity of green body and sintered body and the reliability of product use, and severe cracking will occur

Method used

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  • Testing method of ceramic suspended matter gelating point and device
  • Testing method of ceramic suspended matter gelating point and device

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Experimental program
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Embodiment

[0023] Disperse the commercially available high-purity (>99.9%) aluminum oxide, zirconium oxide, silicon nitride or monite raw materials with a volume moment average diameter of 0.5 μm and a nearly spherical shape into the premix solution respectively. The following is just an example of aluminum oxide being dispersed in the premix, under the following conditions: in the premix (containing 5%, 10%, 15% or 18.6% of the organic The ratio of methanebisacrylamide and acrylamide is 3:35, 2:50, 1:55 or 1:90, the content of deionized water is from 81.4% to 95%), the volume fraction of preparation is 5vol%, 20vol%, 40vol% or 53vol% ceramic suspension, ball milled for 48 hours, take out 100ml, add 100μl catalyst N,N,N',N'-tetramethylethylenediamine and 250μl initiator ammonium persulfate, and then put it into a constant temperature reaction vessel , Respectively react under normal pressure, 65MPa, 96MPa. Through the data collection and analysis system, such as figure 2 The curve sho...

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Abstract

A method and apparatus for measuring the coagulating point of ceramic suspension are based on the principle that the coagulation in situ of ceramic suspension can be induced by heat releasing and external pressure. Said method includes preparing the slurry of ceramic suspension, loading the slurry in mould, putting the pressure applying head and temp sensor in said slurry while attaching pressure sensor to bottom of mould, applying pressure to the slurry, acquiring the data, processing the data by computer program, drawing the relation curve between pressure, temp and coagulating point, and determining the initial coagulating point.

Description

technical field [0001] The invention belongs to the technical field of ceramic molding, and in particular relates to a method and device for measuring the gel point of a ceramic suspension which is an important parameter in the ceramic molding process. Background technique [0002] At present, the internationally recognized and representative three ceramic colloidal molding processes, namely DCC, Gelcasting and traditional injection molding, all rely on temperature-induced in-situ solidification of ceramic concentrated suspensions. However, the existence of temperature gradient will lead to uneven solidification and internal stress inside the green body, thus affecting the uniformity of the green body and sintered body and the reliability of the product, and severe cracking will occur. The study found that in the colloidal injection molding process, the external pressure can induce the rapid in-situ overall solidification of the ceramic suspension, which can avoid the intern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/04
Inventor 杨金龙马天戴春雷席小庆黄勇
Owner TSINGHUA UNIV
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