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Aluminum borate whisker reinforced and toughened nonmetal-based composite material and preparation method thereof

A technology of aluminum borate whiskers and non-metallic materials, which is applied in the field of reinforcing and toughening non-metallic matrix composite materials, can solve the problems of poor fracture toughness, limit the industrial application of alumina ceramic materials, etc. Density, the effect of improving mechanical properties

Pending Publication Date: 2021-11-23
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inherent brittleness of ceramic materials, poor fracture toughness limits the industrial application of alumina ceramic materials
In the prior art, there is no precedent for using aluminum borate whiskers to strengthen and toughen non-metallic materials (including inorganic non-metallic materials and organic polymer materials)

Method used

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  • Aluminum borate whisker reinforced and toughened nonmetal-based composite material and preparation method thereof
  • Aluminum borate whisker reinforced and toughened nonmetal-based composite material and preparation method thereof
  • Aluminum borate whisker reinforced and toughened nonmetal-based composite material and preparation method thereof

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preparation example Construction

[0040] The invention also discloses a method for preparing aluminum borate whisker-reinforced and toughened non-metal matrix composite materials, comprising the following steps:

[0041] a. Mix aluminum borate whiskers with non-metallic materials and ball mill them;

[0042] b. The mixture after ball milling is subjected to vacuum hot-pressing sintering treatment; the increase in fracture toughness of the composite material is mainly due to the toughening of the whiskers. Surface recrystallization forms needle-like whiskers, and bridges appear between some whiskers. Through the model of the increase in fracture toughness of composites caused by bridging whiskers, it can be seen that the fracture toughness of composites increases with the increase of whisker volume fraction. At the same time, crack deflection and bridging due to toughening whiskers will also improve the fracture toughness of the material. The wear performance of composite materials is mainly affected by the c...

Embodiment 1

[0051] The aluminum borate whisker reinforced toughening alumina-based composite ceramics of this embodiment adopts 9Al 2 o 3 2B 2 o 3 Aluminum borate whiskers reinforced toughened alumina ceramic material (Al with a volume ratio of 4:1 2 o 3 / TiB 2 ); the length of the aluminum borate whisker is 5 μm, and the diameter is 0.4 μm; the addition of the aluminum borate whisker is 20% (composite material total amount), and its preparation method is:

[0052] a. Add aluminum borate whiskers, alumina ceramic materials and zirconia grinding balls into a ball milling pot and mill until the particle size of the powder is less than 1.0 μm;

[0053] b. The mixture after ball milling is subjected to vacuum hot pressing sintering treatment; the sintering temperature is 1500°C, the sintering pressure is 36MPa, and the holding time is 60min.

Embodiment 2

[0055] The aluminum borate whisker reinforced toughening alumina-based composite ceramics of this embodiment adopts 9Al 2 o 3 2B 2 o 3 Aluminum borate whisker reinforced toughened alumina ceramic material (volume percentage is 56% Al 2 o 3 , 14%TiB 2 ); the length of the aluminum borate whisker is 15 μm, and the diameter is 1.0 μm; the addition of the aluminum borate whisker is 30% (composite material total amount), and its preparation method is:

[0056] a. Add aluminum borate whiskers, alumina, titanium diboride powder and zirconia grinding balls into a ball milling pot and mill until the particle size of the powder is less than 1.0 μm;

[0057] b. Vacuum hot pressing sintering treatment is carried out on the mixture after ball milling; the sintering temperature is 1380° C., the sintering pressure is 5 MPa, and the holding time is 30 minutes.

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Abstract

The invention discloses an aluminum borate whisker reinforced and toughened nonmetal-based composite material. An aluminum borate whisker reinforced and toughened nonmetal material is adopted; and the bending strength and fracture toughness of the nonmetal-based composite material are improved by reinforcing and toughening the nonmetal-based composite material through the aluminum borate whiskers, and the wear resistance of the nonmetal-based composite material is reduced. Firstly, after forming a liquid phase, the aluminum borate whiskers flow into a crystal boundary and are recrystallized to coat crystal grains, so that the effect of inhibiting the growth of the crystal grains is achieved, and pores are filled to increase the density; secondly, the liquefied aluminum borate crystal whiskers are extruded by the crystal grains and recrystallized on the surfaces of the crystal grains to form crystal whiskers, and the matrix strength is improved due to the insertion and extraction mechanism of the crystal whiskers; and thirdly, the liquefied aluminum borate crystal whiskers are reduced by solid phase C and part of gasified C from isolation carbon paper, a graphite mold, a graphite heating body and carbon felt and then react with ZrO2 at the internal grain boundary to generate ZrB2, and ZrB2 has a very good toughening effect.

Description

technical field [0001] The invention relates to the field of reinforced and toughened non-metallic matrix composite materials, in particular to an aluminum borate whisker reinforced and toughened nonmetallic matrix composite material and a preparation method thereof. Background technique [0002] Aluminum borate whiskers were first discovered by a Japanese scientist. It has extremely high Young's modulus, high tensile strength and Mohs hardness. There are many kinds of aluminum borate whiskers, whose general chemical formula is nAl 2 o 3 ·B 2 o 3 , depending on the sintering temperature and preparation method, the common one is 9Al 2 o 3 2B 2 o 3 、Al 2 o 3 ·B 2 o 3 , 2Al 2 o 3 ·B 2 o 3 These three types. of which 9Al 2 o 3 2B 2 o 3 has a density of 2.93g cm -3 , with a melting point of about 1450°C, high hardness, high strength, insoluble in acidic and alkaline solutions, the best overall performance, and low price, suitable for large-scale production. ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/10C04B35/622C04B35/645
CPCC04B35/10C04B35/622C04B35/645C04B2235/5276C04B2235/6581C04B2235/6567C04B35/80C04B35/117C04B2235/3813C04B2235/522C04B2235/3409C04B2235/526C04B2235/5264C04B2235/3244C04B2235/96C04B2235/77C04B2235/786C08J5/0405C04B35/6261C04B2235/3217C04B2235/5436C08J3/203C08J2363/00
Inventor 贾碧施金良邸永江刘银王雪怡田浩朱俊唐睿陈星宇张丹瑕张文轩
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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