Low-density high-thermal-shock-resistance composite ceramic powder and preparation method thereof

A technology of composite ceramics and thermal shock resistance, which is applied in the field of low density and high thermal shock resistance composite ceramic powder and its preparation, can solve the problems of difficult preparation of low density and high thermal shock resistance composite ceramic materials, and achieve low cost , The effect of good powder performance

Inactive Publication Date: 2019-06-21
永州明睿陶瓷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Take each raw material, binder, dispersant, and defoamer, and grind them in a high-speed stirring mill for 2 to 4 hours. The dispersion medium is deionized water, and the grinding medium is high-purity alumina ceramic balls or zirconia ceramic balls. Uniform slurry; the weight percentage of each raw material is: α-alumina micropowder 67.7~84.6%, tabular corundum 5~10%, fused mullite powder 8~15%, magnesium oxide 0.1~0.5%, kaolin 1% ~3%, calcium carbo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] A preparation method of composite ceramic powder with low density and high thermal shock resistance includes the following steps:

[0035] (1) Weigh the components according to the following weight percentages: 80% to 95% mullite powder, 0% to 5% silicon carbide powder, 0% to 5% silica powder, 0% to 2% Zirconia powder, 0-10% cordierite powder; mixing the mullite powder, the silicon carbide powder, the silica powder and the zirconia powder to obtain a raw meal powder, and the raw meal powder Wet grinding in a high-speed stirring mill for 20-40 hours, the dispersion medium is deionized water, and the grinding medium is high-purity alumina ceramic balls or zirconia ceramic balls to obtain a uniformly mixed slurry;

[0036] (2) Add dispersant, emulsifier, and binder to the slurry in step (1) and then grind;

[0037] (3) Spray drying and sintering the raw materials prepared in step (2) to obtain hollow mullite composite ceramic microspheres;

[0038] (4) Add a binder to the hollow ...

Example Embodiment

[0046] In a specific embodiment, the mixing cost of the raw meal powder in step (1) is divided into 12 components A0 to D3 according to the composition table in the following table, where A0 is mullite powder without adding any other components.

[0047] Specific embodiment components are shown in Table 1

[0048] Example Mullite / % Cordierite / % Silicon carbide / % Silica / % Zirconia / % A01000000 A1955000 A2928000 A39010000 B18910100 B288.510200 B38810300 C187.510210 C2871021.50 C38610220 D185.51021.51 D2851021.51.5 D384.51021.52

[0049] Ceramic performance comparison table 2

[0050] ExampleDensity ceramic g / cm 3

[0051] Under the same calcination conditions, take the samples in Examples A0 to D3, grind and polish them to test the relevant performance, the test method:

[0052] (1) Use three-point bending to test the flexural strength of ceramics;

[0053] (2) Measure the density of the ceramic sample prepared by the powder by the Ajimiad drainage method;

[0054] (3) Heat the cerami...

Example Embodiment

[0061] Synthesizing Examples A0 to D3, a preferred solution for preparing a composite ceramic with low density and high thermal shock resistance is Example D3.

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Abstract

The invention discloses low-density high-thermal-shock-resistance composite ceramic powder and a preparation method thereof. The composite ceramic powder comprises the following components in percentages by mass: 80-95% of mullite powder, 0-5% of silicon carbide powder, 0-5% of silicon dioxide powder, 0-2% of zirconium oxide powder and 0-10% of cordierite powder. The nano mullite-cordierite powderis taken as a matrix, zirconium oxide, silicon carbide and silicon dioxide are added into the nano mullite-cordierite powder, the cordierite has effects of reducing the linear expansion coefficient of the material and improving the thermal conductivity of the material, the silicon carbide improves the thermal conductivity, and the zirconium oxide has effect of improving the toughness of the composite ceramic, so that the thermal-shock-resistance low-density composite ceramic material is obtained.

Description

[0001] Technical field: [0002] The invention relates to the technical field of ceramic preparation, and more specifically relates to a low-density high thermal shock resistance composite ceramic powder and a preparation method thereof. [0003] Background technique: [0004] The ability of a material to resist damage under conditions of rapid temperature changes. It was once called thermal stability, thermal shock stability, thermal shock resistance, temperature abrupt change resistance, rapid cooling and rapid heat resistance, etc. [0005] Refractory materials are brittle materials at low and medium temperatures and lack ductility. In the use of thermal equipment, they are often subjected to sharp temperature changes, resulting in damage. Thermal shock resistance is one of the important performances of refractories [0006] Alumina-based ceramic materials have the advantages of large elastic modulus, high strength, high hardness, high temperature oxidation resistance, lig...

Claims

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Application Information

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IPC IPC(8): C04B35/185C04B35/622C04B35/626
Inventor 邓承溪罗忠义
Owner 永州明睿陶瓷科技有限公司
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