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A kind of preparation method of cordierite ceramic powder

A technology of ceramic powder and cordierite, applied in the field of preparation of cordierite ceramic powder, can solve the problems of excessive powder particle size and poor powder dispersibility, and achieves good dispersibility, low crystallinity, high quality and stability sexual effect

Active Publication Date: 2020-08-11
YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at problems such as easy occurrence of impurity phases, excessive powder particle size, poor powder dispersibility and the like in the preparation process of existing cordierite powders, and provides a preparation method of cordierite ceramic powders

Method used

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  • A kind of preparation method of cordierite ceramic powder
  • A kind of preparation method of cordierite ceramic powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Mixing materials: high-purity MgO and Al with particle sizes of 1 μm, 0.5 μm and 30 nm respectively 2 o 3 , SiO 2 According to the mass fraction of 13.8%, 34.8%, and 51.4%, respectively, the ingredients are placed in an alumina mixing tank, with ethanol as the grinding medium, and under the action of zirconia balls, they are ground at high speed in a planetary ball mill for 4 hours;

[0025] (2) Drying: After the mixing is completed, place the slurry in an 80°C drying oven to fully dry;

[0026] (3) Manual granulation and sieving: take out the dried powder, vacuum-seal it, form it by cold isostatic pressing under a pressure of 80MPa, and then pass it through a 60-mesh sieve after crushing to obtain a granulated powder with good fluidity;

[0027] (4) Reaction synthesis: the granulated powder is placed in an alumina crucible, and synthesized by high-temperature reaction at 1400° C. for 2 hours in an oxidizing atmosphere furnace.

[0028] (5) Powder refinement trea...

Embodiment 2

[0031] (1) Mixing materials: high-purity MgO and Al with particle sizes of 1 μm, 0.5 μm and 30 nm respectively 2 o 3 , SiO 2 According to the mass fraction of 13%, 35%, and 52%, respectively, the ingredients are placed in an alumina mixing tank, with ethanol as the grinding medium, and under the action of zirconia balls, high-speed grinding in a planetary ball mill for 4 hours;

[0032] (2) Drying: After the mixing is completed, place the slurry in an 80°C drying oven to fully dry;

[0033] (3) Manual granulation and sieving: take out the dried powder, vacuum-seal it, form it by cold isostatic pressing under a pressure of 80MPa, and then pass it through a 60-mesh sieve after crushing to obtain a granulated powder with good fluidity;

[0034] (4) Reaction synthesis: the granulated powder is placed in an alumina crucible, and synthesized in an oxidizing atmosphere furnace through a high-temperature reaction at 1380°C for 2 hours;

[0035] (5) Powder refinement treatment: plac...

Embodiment 3

[0038] (1) Mixing materials: high-purity MgO and Al with particle sizes of 75 μm, 0.5 μm and 75 μm respectively 2 o 3 , SiO 2 According to the mass fraction of 14%, 34%, and 52%, respectively, the ingredients are placed in an alumina mixing tank, and ethanol is used as the grinding medium. Under the action of zirconia balls, it is ground at high speed in a planetary ball mill for 4 hours;

[0039] (2) Drying: After the mixing is completed, the slurry is fully dried in a 100°C drying oven;

[0040] (3) Manual granulation and sieving: take out the dried powder, vacuum-seal it, and press it under 60MPa pressure to form it, then crush it and pass it through a 60-mesh sieve to obtain a granulated powder with good fluidity;

[0041] (4) Reaction synthesis: the granulated powder is placed in an alumina crucible, and synthesized by a high temperature reaction at 1350° C. for 2 hours in an oxidizing atmosphere furnace.

[0042] Effect of this embodiment: This embodiment can obtain a...

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Abstract

The invention relates to a preparation method of cordierite ceramic powder, high purity cordierite low thermal expansion ceramic powder can be synthesized by reaction from magnesium oxide, alumina and silicon oxide powder as raw materials according to the chemical composition of (2MgO.2Al2O3.5SiO2 or Mg2Al4Si5O18) of cordierite. The preparation process is as follows: 1, high purity powder ball milling and mixing; 2, slurry drying; 3, manual granulation and sieving; and 4, high temperature reaction to synthesize the high-purity cordierite powder. The purity of the cordierite powder obtained by the method is more than 98%, the particle size of the cordierite powder which is not refined is about 20 mu m. The cordierite synthesis method adopted in the invention is easy to operate, impurity introduction is avoided, the high purity powder can be obtained, and the high purity powder is conducive to the preparation of late low thermal expansion ceramics, and is suitable for mass production.

Description

technical field [0001] The invention relates to a method for preparing cordierite ceramic powder, which belongs to the technical field of ceramic preparation. Background technique [0002] Because of its excellent thermal shock resistance, high mechanical strength and chemical corrosion resistance, cordierite ceramics have always been the material of choice for automotive exhaust purifiers. Not only that, but also have broad applications in the field of electronic packaging and precision semiconductor components application prospects. High-purity, ultra-fine cordierite powder is the key to obtaining low thermal expansion ceramic materials. There are three main methods for synthesizing cordierite powder: solid-state reaction method, sol-gel method and glass crystallization method. In comparison, the solid-state reaction method is the easiest to operate and has the lowest cost; although the sol-gel method can appropriately reduce the synthesis temperature, it is difficult to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/195C04B35/622
CPCC04B35/195C04B35/622C04B2235/6583
Inventor 张丛曹剑武郭建斌燕东明高晓菊李志鹏乔光利王成满蓬邢文芳林广庆王志伟赵斌周雅伟方志坚刘发付梁西瑶常永威贾书波李康杨双燕王静慧李国斌张武张涛
Owner YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP