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Aluminium titanate base high temperature structural composite material and preparation method thereof

A composite material, aluminum titanate technology, applied in the field of ceramic materials, can solve the problems of large difference in thermal expansion, low expansion characteristics, unstable cooling of aluminum titanate, etc.

Inactive Publication Date: 2009-04-01
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The aluminum titanate ceramic material has two disadvantages: one is that the thermal expansion of each crystal axis of the aluminum titanate crystal differs greatly, resulting in micro-cracks of the aluminum titanate during cooling, so the mechanical strength of the aluminum titanate material is low, and it is resistant to bending at room temperature. The strength is lower than 20MPa; the second is that the aluminum titanate synthesized at high temperature is unstable when the temperature is lowered to 900 ° C ~ 1300 ° C, and it decomposes into rutile (TiO 2 ) and corundum (α-Al 2 o 3 ), while losing the low expansion properties
The research and application in this aspect have not been reported at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Ingredients: 98% aluminum titanate powder with a particle size <0.74mm, 2% zirconium titanate powder with a particle size <0.074mm.

[0020] Measure and mix aluminum titanate powder and zirconium titanate powder and dry mix for 1 minute, then add 6% (percentage by weight) of polyvinyl alcohol solution with a mass concentration of 0.5%, stir for 5 minutes, let the materials stand for 5 hours, and then obtain a molding billet. The molded blank was molded into a sample by a hydraulic press, and the pressure of the molded sample was 100 MPa. The samples were sintered in an electric furnace under atmospheric air conditions, the sintering temperature was 1500°C, and the holding time was 3h.

[0021] The bulk density of the aluminum titanate-based high-temperature structural composite sample after firing is 3.32g / cm -3 , the flexural strength is 44.6MPa, and the coefficient of thermal expansion α is 1.2×10 -6 / °C (room temperature ~ 1000°C), the number of thermal shock frac...

Embodiment 2

[0023] Ingredients: 95% aluminum titanate powder with a particle size <0.74mm, 5% zirconium titanate powder with a particle size <0.074mm.

[0024] Measure and mix aluminum titanate powder and zirconium titanate powder and dry mix for 1 minute, then add 6% (percentage by weight) of polyvinyl alcohol solution with a mass concentration of 0.5%, stir for 5 minutes, let the materials stand for 5 hours, and then obtain a molding billet. The molded blank was molded into a sample by a hydraulic press, and the pressure of the molded sample was 100 MPa. The samples were sintered in an electric furnace under atmospheric air conditions, the sintering temperature was 1500°C, and the holding time was 3h.

[0025] The volume density of the aluminum titanate-based high-temperature structural composite sample after firing is 3.37g / cm -3 , the flexural strength is 48.2MPa, and the coefficient of thermal expansion α is 1.5×10 -6 / ℃ (room temperature ~ 1000 ℃), the number of thermal shock fr...

Embodiment 3

[0027] Ingredients: 92% aluminum titanate powder with a particle size <0.74mm, 8% zirconium titanate powder with a particle size <0.074mm.

[0028] Measure and mix aluminum titanate powder and zirconium titanate powder and dry mix for 1 minute, then add 6% (percentage by weight) of polyvinyl alcohol solution with a mass concentration of 0.5%, stir for 5 minutes, let the materials stand for 5 hours, and then obtain a molding billet. The molded blank was molded into a sample by a hydraulic press, and the pressure of the molded sample was 100 MPa. The samples were sintered in an electric furnace under atmospheric air conditions, the sintering temperature was 1500°C, and the holding time was 3h.

[0029] The volume density of the aluminum titanate-based high-temperature structural composite sample after firing is 3.41g / cm -3 , the flexural strength is 57.9MPa, and the coefficient of thermal expansion α is 1.9×10 -6 / ℃ (room temperature ~ 1000 ℃), the number of thermal shock fr...

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Abstract

The invention relates to an aluminium titanate based high temperature structure composite material and a preparation method thereof, and pertains to the ceramic material field. The raw materials of the composite material and the weight percent thereof are: aluminium titanate powder, 90-98%; zirconium titanate powder, 2-10%. The grain diameter of the used raw material is less than 0.074 mm. The method for preparing the composite material is that: after being measured and proportioned, the raw materials are mixed in dryness for one minute, then 6% (weight percentage) of polyvinyl alcohol solution bonding agent with 0.5% of mass concentration is added, after being stirred for 5 minutes, the aging mixture is let stand for 5 hours so as to obtain the shaping blank; pressing and shaping are carried out on the blank by adopting a hydraulic press or a friction press, the shaping pressure of the blank is 70-100MPa; after shaping, heat retaining at more than or equal to 1500 DEG C for three hours and sintering are carried out on the blank, and the aluminium titanate based composite material with high temperature resistance, excellent thermal shock resistance and higher intensity is obtained. The composite material can be used in the fields such as metallurgy, automobile, aerospace, etc.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to an aluminum titanate-based high-temperature structural composite material and a preparation method thereof. Background technique [0002] The present invention is to develop a kind of aluminum titanate base (Al 2 TiO 5 -ZrTiO 4 ) High temperature structural composite materials. The composite material is composed of aluminum titanate as the main component and a small amount of zirconium titanate. The composite material has good high temperature performance, strength and thermal shock resistance. [0003] Aluminum titanate (Al 2 TiO 5 ) The ceramic material has a high melting point (1860°C). In the temperature range of room temperature to 1000°C, aluminum titanate has a low thermal expansion coefficient α (α is less than zero, or close to zero), which is currently the only low expansion, high melting point thermal shock resistant ceramic material. [0004] The al...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/622
Inventor 王志发卜景龙王榕林贾翠张利芳周琳琳
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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