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A kind of preparation method of large-size zirconia-based thermal insulation material

A zirconia-based, heat-insulating material technology, applied in the field of ceramic materials, can solve the problems of unfavorable high porosity maintenance, small drying shrinkage, and high uniformity, and achieve the effects of facilitating preparation, reducing sintering shrinkage, and reducing shrinkage

Active Publication Date: 2018-11-09
SINOMA SYNTHETIC CRYSTALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method is aimed at a specific powder formula and adopts a gel injection molding wet billet drying method, which can effectively avoid the problem of deformation and cracking of the gel injection molded large-sized billet during drying, so that the obtained billet has high uniformity and is easy to dry. Small shrinkage, which effectively solves the problem of excessive shrinkage during sintering of zirconia, which is not conducive to maintaining high porosity

Method used

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  • A kind of preparation method of large-size zirconia-based thermal insulation material
  • A kind of preparation method of large-size zirconia-based thermal insulation material
  • A kind of preparation method of large-size zirconia-based thermal insulation material

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Effect test

Embodiment 1

[0053] The screening of embodiment 1 drying method of the present invention

[0054] During the drying and dehydration process of the gel, with the continuous loss of water filled between the raw material particles, voids appear between the raw material particles that were originally uniformly dispersed in the water slurry. In order to reduce the surface energy, the particles fixed in it will approach each other to form a relatively tight accumulation, and the macroscopic performance is that the green body shrinks and deforms. If the drying process is not properly controlled, problems such as curling, deformation, or even cracking and scrapping of the green body will occur, which will have an important impact on the final performance of the ceramic.

[0055] Commonly used drying methods for gel injection molding are low temperature drying and solution displacement drying:

[0056] Low-temperature drying: put the wet billet into a constant temperature and humidity box, and d...

Embodiment 2

[0061] Embodiment 2 The formulation test screening of the thermal insulation material of the present invention

[0062] In order to ensure the thermal insulation performance of the ceramic material, it is required that the thermal insulation material has a relatively high porosity. However, ZrO 2 The sintering of the ceramic green body will produce a large volume shrinkage, which will densify the material, which is not conducive to maintaining the porous structure of the green body, resulting in an increase in the density of porous ceramics. while ZrO 2 and α-Al 2 o 3 No solid solution is formed between them at high temperature, by adding to ZrO 2 Add α-Al to the powder 2 o 3 powder, using α-Al 2 o 3 powder to ZrO 2 sintering hindrance, thereby reducing the ZrO 2 The sintering shrinkage can effectively maintain the porosity of porous ceramics after sintering.

[0063] At 1500°C, to ZrO 2 Add different content of α-Al to the powder 2 o 3 The shrinkage results of...

Embodiment 3

[0069] In this example, the organic monomer is acrylamide, the crosslinking agent is N,N'-methylenebisacrylamide, the dispersant is ammonium polyacrylate, and the catalyst is N',N'-tetramethylethylenediamine. The initiator is ammonium persulfate.

[0070] The preparation process proceeds as follows:

[0071] Mix 279g deionized water, 27.9g acrylamide, and 2.7g N,N'-methylenebisacrylamide together and stir until a clear and transparent solution (premix); mix the premix, 86.7g ZrO 2 Powder, 28.9gα-Al 2 o 3 Put the powder, 3ml of ammonium polyacrylate, and 400g of zirconia ball milling balls into an alumina ball milling tank, and mill for 12 hours;

[0072] Add 13.5g of 20% ammonium persulfate aqueous solution and 1.3g of N,N,N',N'-tetramethylethylenediamine to the obtained slurry, stir well and quickly pour it into a polypropylene mold coated with silicone oil , the mold size is 135mm×135mm×70mm, and the injection mold thickness is 30mm; the mold is placed in a water bath at...

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Abstract

The invention provides a preparation method of a large-size zirconia-based heat insulation material, and the heat insulation prepared by adopting the method. The preparation method comprises the following steps: 1, mixing deionized water, organic monomers and a cross-linking agent, adding alpha-Al2O3 powder, ZrO2 powder and a dispersant, and carrying out ball milling by adopting a zirconium dioxide ball to obtain a slurry; 2, adding an initiator and a catalyst to the slurry obtained in step 1, stirring, injecting the obtained mixture to a die, solidifying, and cooling to obtain a wet green body; and 3, drying the wet green body obtained in step 2, and sintering. The preparation method comprises special blank molding treatment according to the formula of specific powder, so the problem of adverseness of too large shrinkage in the zirconia sintering process to pore maintenance is effectively solved, the deformation and cracking problems appearing in the drying process of gel injection molded large-size green body are avoided, and the obtained green body has the advantages of high uniformity and small drying shrinkage.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to a preparation method of a large-size zirconia-based heat insulating material. Background technique [0002] In recent years, my country's aerospace industry has developed rapidly, especially the strategic value of adjacent space has gradually attracted attention and attention. Many experts even define adjacent space as the real focus of future air and space combat competition. Therefore, all kinds of near-space vehicles have become the research and development hotspots of various countries because of their potential military and civilian values. [0003] Near-space vehicles are subject to complex environments such as severe heat, vibration, and shock during their entry and exit into the earth's atmosphere. For example, when the aircraft flies at a speed of Mach 8 at an altitude of 27km, the temperature at the nose cone is as high as 1700°C, and the temperature at the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48
Inventor 张伟儒郑彧邹景良张哲韦中华李镔王腾飞
Owner SINOMA SYNTHETIC CRYSTALS CO LTD
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