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Titanium dioxide sol reinforced corundum-mullite product and production method thereof

A technology of titanium dioxide and mullite, applied in the direction of fire-resistant coatings, etc., can solve the problems of affecting mechanical strength, large difference in expansion coefficient, micro-cracks, etc., to improve compressive and flexural strength and service life, suppress lattice distortion, Effect of enhancing thermal shock resistance

Active Publication Date: 2012-10-03
ANJI KELING MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it has two disadvantages: one is that the expansion coefficient of the crystal varies greatly in all directions, and it is easy to produce microcracks, which affects the mechanical strength; the other is that it is easy to decompose into rutile and corundum phases between 850 ° C and 1300 ° C
[0006] At present, there is no relevant report on the preparation of composite ceramic kiln furniture with excellent pressure resistance, flexural resistance and thermal shock resistance by using titanium dioxide sol as a binder to generate aluminum titanate in situ in a corundum mullite matrix.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, a kind of production method of titania sol reinforced corundum mullite products, by weight percent is 20% corundum particles (<3mm), 35% mullite particles (<3mm), 15% aluminum powder ( ≤2μm), 15% silica powder (≤2μm) and 15% andalusite particles (<3mm) to form the raw material, with titanium dioxide sol accounting for 20% of the total weight of the raw material as the binding agent, the solid phase weight of titanium dioxide in the titanium dioxide sol Content is 5%; Carry out following steps successively:

[0022] 1), put all the raw materials into the mixer and dry mix for 1 hour to obtain dry powder;

[0023] 2), adding titanium dioxide sol to the dry powder and then wet mixing for 2 hours to obtain a mixture;

[0024] 3) After the mixture was trapped at room temperature for 20 hours, it was pressed into shape with a molding pressure of 120Mpa; after natural drying for 1 day (24h), it was fired at 1450°C for 8 hours to obtain a titanium dioxide sol rei...

Embodiment 2

[0026] Embodiment 2, a kind of production method of titania sol reinforced corundum mullite products, by weight percent is 15% corundum particles (<3mm), 35% mullite particles (<3mm), 25% aluminum powder ( ≤2 μm) and 25% microsilica powder (≤2 μm) to form the raw material, with titanium dioxide sol accounting for 5% of the total weight of the raw material as a binding agent, the solid phase weight content of titanium dioxide in the titanium dioxide sol is 10%; the following steps are carried out in sequence:

[0027] 1), put all the raw materials into the mixer and dry mix them for 2 hours to obtain dry powder;

[0028] 2), adding titanium dioxide sol to the dry powder and then wet mixing for 1 hour to obtain a mixture;

[0029] 3) After the mixture was trapped at room temperature for 5 hours, it was press-molded at a molding pressure of 150 MPa. After natural drying for 1.5 days, it was fired at 1600° C. for 10 hours to obtain a titanium dioxide sol reinforced corundum mullit...

Embodiment 3

[0031] Embodiment 3, a kind of production method of titania sol reinforced corundum-mullite product, be 40% corundum particle (<3mm), 15% mullite particle (<3mm), 15% aluminum powder ( ≤2μm), 20% silica powder (≤2μm) and 10% andalusite particles (<3mm) to form the raw material, with titanium dioxide sol accounting for 10% of the total weight of the raw material as the binding agent, the solid phase weight of titanium dioxide in the titanium dioxide sol Content is 2%; Carry out following steps successively:

[0032] 1), put all the raw materials into the mixer and dry mix them for 2 hours to obtain dry powder;

[0033] 2), adding titanium dioxide sol to the dry powder and then wet mixing for 2 hours to obtain a mixture;

[0034] 3) After the mixture was trapped at room temperature for 5 hours, it was press-molded with a molding pressure of 110 MPa; after natural drying for 1 day, it was fired at 1500° C. for 8 hours to obtain a titanium dioxide sol-reinforced corundum-mullite ...

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Abstract

The invention discloses a titanium dioxide sol reinforced corundum-mullite product which is produced from the following materials in percentage by weight: 15-55% of corundum particles, 15-55% of mullite particles, 15-45% of aluminum micro powder, 15-25% of silicon micro powder and 0-40% of andalusite particles, wherein the corundum particles, the mullite particles and the andalusite particles are all smaller than 3mm, both aluminum micro powder and the silicon micro powder are not larger than 2 mu m, and titanium dioxide sol accounting for 5-20% of the gross weight of the materials is used as the binding agent. the invention also provides a production method of the titanium dioxide sol reinforced corundum-mullite product, which comprises the following steps of: (1) mixing all the materials in a mixer under a dry condition; (2) adding titanium dioxide sol to the obtained dry power, and then mixing under a wet condition; and (3) sequentially carrying out ageing treatment, pressure molding, natural drying and firing on the mixture. The obtained product has fine compressive strength and folding strength.

Description

technical field [0001] The invention relates to a refractory material and a preparation method thereof, in particular to a titanium dioxide sol reinforced corundum mullite product and a production method thereof. Background technique [0002] At present, although corundum-mullite composite ceramics have the excellent properties of both corundum and mullite, their compressive flexural strength and thermal shock resistance are still not satisfactory. [0003] Aluminum titanate ceramics have attracted more and more attention because of their high melting point (1860°C) and low thermal expansion coefficient (0.5-1.5×10-6 / K). But it has two disadvantages: one is that the crystal has a large difference in expansion coefficient in each direction and is prone to microcracks, which affects the mechanical strength; the other is that it is easy to decompose into rutile and corundum phases between 850 ° C and 1300 ° C. [0004] Most of the existing research uses aluminum titanate as th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K21/02C04B35/66
Inventor 徐生富杨辉郭兴忠李文彦
Owner ANJI KELING MAGNETIC MATERIAL