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Zirconium titanate-based high temperature structure composite material and preparation thereof

A composite material, zirconium titanate technology, applied in the field of ceramic materials, can solve the problems of low flexural strength, large difference in thermal expansion, low expansion characteristics, etc., and achieve good thermal shock resistance

Inactive Publication Date: 2009-04-15
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 composition: 98% of zirconium titanate powder with a particle size of <0.74mm, and 2% of aluminum titanate powder with a particle size of <0.074mm.

[0020] Measure and mix zirconium titanate powder and aluminum titanate powder and dry mix for 1 minute, then add 6% (weight percentage) of polyvinyl alcohol solution binder 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 billet was molded with a hydraulic press, and the sample molding pressure was 100 MPa; the sample was sintered in an electric furnace under atmospheric air conditions, with a sintering temperature of 1550°C and a holding time of 3 hours.

[0021] The bulk density of the zirconium titanate-based high-temperature structural composite sample after firing is 4.45g / cm -3 , the flexural strength is 85.2MPa, and the coefficient of thermal expansion α is 6.3×10 -6 / °C (room temperature ~ 1000°C), the number of th...

Embodiment 2

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

[0024] Measure and mix zirconium titanate powder and aluminum titanate powder and dry mix for 1 minute, then add 6% (weight percentage) of polyvinyl alcohol solution binder 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 billet was molded with a hydraulic press, and the sample molding pressure was 100 MPa; the sample was sintered in an electric furnace under atmospheric air conditions, with a sintering temperature of 1550°C and a holding time of 3 hours.

[0025] The bulk density of the zirconium titanate-based high-temperature structural composite sample after firing is 4.43g / cm -3 , the flexural strength is 75.4MPa, and the coefficient of thermal expansion α is 5.9×10 -6 / °C (room temperature ~ 1000°C), the number of therm...

Embodiment 3

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

[0028] Measure and mix zirconium titanate powder and aluminum titanate powder and dry mix for 1 minute, then add 6% (weight percentage) of polyvinyl alcohol solution binder 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 billet was molded with a hydraulic press, and the sample molding pressure was 100 MPa; the sample was sintered in an electric furnace under atmospheric air conditions, with a sintering temperature of 1550°C and a holding time of 3 hours.

[0029] The bulk density of the zirconium titanate-based high-temperature structural composite sample after firing is 4.38g / cm -3 , the flexural strength is 70.7MPa, and the coefficient of thermal expansion α is 5.8×10 -6 / °C (room temperature ~ 1000°C), the number of therm...

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Abstract

The invention relates to a zirconia titanate based high-temperature structured composite material and a preparation method thereof, which belongs to the field of ceramic materials. The composite material adopts the raw materials with the weight percent of 90-98 percent of zirconia titanate powder and 2-10 percent of aluminum titanate powder, wherein, the grain diameter of the adopted raw material is less than 0.074mm. The preparation method of the composite material comprises: measuring and batching the raw materials, dry-blending for 1 minute, adding 6 percent (weight percent) of polyvinyl alcohol solution bonding agent with 0.5 percent of mass concentration, stirring for 5 minutes, standing and ageing mixture for 5h to obtain the formed stock; adopting a hydraulic press or a friction press to press and form the stock on the condition that the forming pressure of the green body is between 70-100MPa; and sintering the formed green body on the condition of insulating heat for 3 hours at 1500 DEG C or higher temperature to obtain the zirconia titanate based composite material with high temperature resistance, high strength and favorable thermal shock resistance. The composite material can be used in the fields of metallurgy, automobile, aerospace, and the like.

Description

[0001] technology field [0002] The invention belongs to the field of ceramic materials, and in particular relates to a zirconium titanate-based high-temperature structural composite material and a preparation method thereof. Background technique [0003] The present invention is to develop a zirconium titanate base (ZrTiO 4 -Al 2 TiO 5 ) High temperature structural composite materials. The composite material is composed of zirconium titanate as the main component and compounded with a small amount of aluminum titanate. The composite material has good high temperature performance, strength and thermal shock resistance. [0004] Zirconium titanate (ZrTiO 4 ) is an inconsistent melting compound with a transition temperature of 1900°C. Zirconium titanate has high strength, low dielectric loss, and good temperature stability, and is an important electronic ceramic material for preparing capacitors, piezoelectric sensors, and microwave dielectric resonators. However, the exc...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/622
Inventor 王榕林王志发卜景龙贾翠马淑龙管丹丹
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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