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Boron nitride fiber reinforced cordierite ceramic based composite material and preparation method thereof

A boron nitride fiber and composite material technology, applied in the field of heat-resistant ceramics, can solve the problems of difficult structure preparation, complex preparation process, and restrictions on wide application, and achieve the effects of reduced processing, simple preparation and molding process, and excellent dielectric properties

Active Publication Date: 2017-06-09
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of continuous fibers can greatly improve its mechanical properties, but the preparation process is complicated and it is usually difficult to prepare components with complex structures, which largely limits its wide application in the engineering field
Moreover, carbon and silicon carbide fibers have a great influence on the dielectric properties of composite materials due to their own electrical properties, which severely limits their application in the field of aerospace wave transmission.

Method used

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  • Boron nitride fiber reinforced cordierite ceramic based composite material and preparation method thereof
  • Boron nitride fiber reinforced cordierite ceramic based composite material and preparation method thereof
  • Boron nitride fiber reinforced cordierite ceramic based composite material and preparation method thereof

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preparation example Construction

[0023] A preparation method of boron nitride fiber reinforced cordierite ceramic matrix composite material, the steps are as follows:

[0024] Step 1. Preparation of cordierite powder slurry: Put the cordierite powder prepared by the sol-gel method in a ball mill tank, put the balls into the ball mill at a ratio of 3 to 6:1 by mass ratio of the ball to material, and then put it into the ball mill Add absolute ethanol into the tank, and then ball mill and wet mix for 6h to 36h under the condition of ball milling speed of 30r / min to 60r / min to obtain cordierite powder slurry, the mass fraction of cordierite powder in the cordierite powder slurry 25% to 55%.

[0025] Step 2. Pretreatment of boron nitride fibers: cutting boron nitride fibers with a diameter of 2 to 10 μm to obtain boron nitride fibers with a length of 3 to 5 mm; immersing the boron nitride fibers with a length of 3 to 5 mm Wash in acetone for 24 to 48 hours to obtain boron nitride fibers with a length of 3 to 5 m...

Embodiment 1

[0037] In this embodiment, a boron nitride fiber-reinforced cordierite ceramic matrix composite material can be obtained by using a hot-pressing sintering process and using boron nitride fiber and cordierite powder as raw materials;

[0038] In step 1, the ball-to-material ratio is 3:1, the ball milling speed is 30r / min, the wet mixing time is 24h, and the mass fraction of cordierite powder in the cordierite powder slurry is 35%.

[0039] In step 2, the diameter of the boron nitride fiber is 6 μm, the length is 3.5 mm, the cleaning time in acetone is 24 h, the ultrasonic power 2 is 200 W, the dispersion time is 20 min, and the mass ratio of boron nitride fiber to absolute ethanol is 1: 200.

[0040] In step 3, the boron nitride fiber dispersion liquid is added to the cordierite powder slurry in 6 times, and then the ultrasonic power is 200W, and the ultrasonic dispersion treatment is performed for 30 minutes. The volume ratio of the cordierite powder to the boron nitride fiber...

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Abstract

The invention discloses a boron nitride fiber reinforced cordierite ceramic based composite material and a preparation method thereof. The preparation method includes: using boron nitride fiber as a reinforcing phase and cordierite powder as a raw material; performing mixing, forming and sintering to obtain ceramic material and components in specific shape. The preparation method specifically includes: preparing cordierite powder paste; pretreating boron nitride fiber; mixing the cordierite powder paste with boron nitride fiber dispersion; removing solvent; filling in a mould for forming; performing hot-pressed sintering to obtain the boron nitride fiber reinforced cordierite ceramic based composite material. Bending strength of the boron nitride fiber reinforced cordierite ceramic based composite material is 69-176Mpa, fracture toughness is 2,2-3.7MP m1 / 2, elasticity modulus is 76-143Gpa, the material has excellent dielectric performance, dielectric constant is smaller than 4.5, and dielectric loss angle tangent value is smaller than 5.0x10-3. The material which is a high-temperature-resistant wave-transmitting material having good mechanical performance and can be directly prepared into special-shaped structural members small in processing allowance.

Description

technical field [0001] The invention relates to a boron nitride fiber-reinforced cordierite ceramic-based composite material and a preparation method thereof. The invention belongs to the technical field of heat-resistant ceramics, and is particularly suitable for preparing various high-strength heat-resistant wave-transmitting ceramics. Background technique [0002] The chemical formula of cordierite is Mg 2 Al 4 Si 5 o 18 , there are mainly two crystal forms, namely high-temperature α-type and low-temperature β-type. High-temperature α-type cordierite has low density and small thermal expansion coefficient (about 2.0×10 -6 ℃ -1 ), excellent high temperature stability, good dielectric properties and infrared radiation capabilities, excellent chemical stability, etc., so in the aerospace industry and automotive, environmental protection, metallurgy, chemical and electronic industries, etc., require high temperature resistance and thermal expansion performance Rigorous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/195C04B35/622
CPCC04B35/195C04B35/622C04B35/803C04B2235/524C04B2235/656C04B2235/658C04B2235/96
Inventor 贾德昌蔡德龙杨治华何培刚王胜金苑景坤段小明周玉
Owner HARBIN INST OF TECH