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Preparation method for boron nitride fiber reinforced silicon boron oxygen nitrogen ceramic based composite material

A technology of silicon boron oxynitride ceramics and boron nitride fiber, which is applied in the field of preparation of boron nitride fiber reinforced silicon boron oxynitride ceramic matrix composite materials, can solve the problems of immature production of continuous boron nitride fiber and achieve dispersion Good, the process is simple and efficient, and the effect of uniform size

Pending Publication Date: 2019-07-30
SHANDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic continuous boron nitride fiber production is still immature, while the production process and product performance of non-continuous boron nitride fiber are relatively stable, which provides the basic conditions for the implementation of this patented technology

Method used

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  • Preparation method for boron nitride fiber reinforced silicon boron oxygen nitrogen ceramic based composite material
  • Preparation method for boron nitride fiber reinforced silicon boron oxygen nitrogen ceramic based composite material
  • Preparation method for boron nitride fiber reinforced silicon boron oxygen nitrogen ceramic based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put the flocculent boron nitride fiber in a ball mill jar, add acetone according to the mass ratio of 1:2, and add zirconia balls according to the material-to-ball ratio of 1:45, and then ball mill on a planetary ball mill at a speed of 200 rpm for 8 minutes Boron nitride short fibers are obtained. The boron nitride short fiber and silicon boron oxynitride ceramic powder are uniformly mixed in a ball mill mixer according to the proportion of boron nitride short fiber added to 20% of the mass of all powders to obtain raw materials for preparing ceramic matrix composite materials. The raw materials are dried and sieved and loaded into a mold for hot-press sintering. The hot-press sintering process parameters are: heating rate 5°C / min, sintering temperature 1700°C, holding time 1 hour, pressure 20MPa. After the hot pressing sintering process is completed, it is cooled with the furnace, and the boron nitride fiber reinforced silicon boron oxygen nitrogen composite material ...

Embodiment 2

[0021] Put the flocculent boron nitride fiber in a ball mill jar, add acetone according to the mass ratio of 1:2, and add zirconia balls according to the material-to-ball ratio of 1:45, and then ball mill on a planetary ball mill at a speed of 200 rpm for 8 minutes Boron nitride short fibers are obtained. The boron nitride short fiber and silicon boron oxynitride ceramic powder are uniformly mixed in a ball mill mixer according to the proportion of boron nitride short fiber added to 20% of the mass of all powders to obtain raw materials for preparing ceramic matrix composite materials. The raw materials are dried and sieved, and then loaded into a mold for hot-press sintering. The hot-press sintering process parameters are: heating rate 5°C / min, sintering temperature 1600°C, holding time 1 hour, pressure 20MPa. After the hot pressing sintering process is completed, it is cooled with the furnace, and the boron nitride fiber reinforced silicon boron oxygen nitrogen composite mat...

Embodiment 3

[0023] Put the flocculent boron nitride fiber in a ball mill jar, add acetone according to the mass ratio of 1:2, and add zirconia balls according to the material-to-ball ratio of 1:45, and then ball mill on a planetary ball mill at a speed of 200 rpm for 8 minutes Boron nitride short fibers are obtained. The boron nitride short fiber and silicon boron oxynitride ceramic powder are uniformly mixed in a ball mill mixer according to the proportion of boron nitride short fiber added to 20% of the mass of all powders to obtain raw materials for preparing ceramic matrix composite materials. The raw materials are dried and sieved and loaded into a mold for hot-press sintering. The hot-press sintering process parameters are: heating rate 5°C / min, sintering temperature 1500°C, holding time 1 hour, pressure 20MPa. After the hot pressing sintering process is completed, it is cooled with the furnace, and the boron nitride fiber reinforced silicon boron oxygen nitrogen composite material ...

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Abstract

The invention discloses a preparation method for a boron nitride fiber reinforced silicon boron oxygen nitrogen ceramic based composite material. The preparation method is characterized in that flocculent boron nitride fibers are subjected to wet milling to obtain boron nitride short fibers, and the boron nitride short fibers are added into silicon boron oxygen nitrogen ceramic powder and evenly mixed to obtain a raw material for preparing the ceramic based composite material; the raw materials are dried, screened and subjected to mould-filling and hot pressed sintering in sequence, afterwards, cooling along with a boiler is conducted, and after the product is taken out of the boiler and demoulded, the boron nitride fiber reinforced silicon boron oxygen nitrogen material can be obtained. The preparation method is simple in technology and suitable for industrial operation, the production period is short, and the cost is low. The density of the composite material obtained by using the method can reach 1.5-2.5 g / cm<3>, the bending resistance is higher than 90 MPa, the breaking tenacity is higher than 5.2 MPa m<1 / 2>, the problem of brittle rupture of the silicon boron oxygen nitrogen ceramic is solved, and the mechanical performance of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of ceramic-based composite materials, and relates to a method for preparing boron nitride fiber-reinforced silicon-boron-oxygen-nitride ceramic-based composite materials. Background technique [0002] Silicon-boron-oxygen-nitride ceramics are a new type of high-temperature-resistant wave-transmitting ceramic material with excellent electrical, thermal and mechanical properties. However, due to the inherent brittleness of this ceramic material, the use of this material in high-temperature structural parts is limited. The Achilles heel of this ceramic material is brittleness. According to the theory of composite materials, when the crack expands and encounters fibers, energy is absorbed through the detachment of the interface between the fibers and the matrix, and the stress concentration is eased; some fibers break under the action of tensile stress. When pulled out from the collective, it will also absorb a ...

Claims

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Application Information

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IPC IPC(8): C04B35/583C04B35/584C04B35/80C04B35/622C04B35/645C04B35/626
CPCC04B35/806C04B35/583C04B35/584C04B35/622C04B35/645C04B35/6261C04B2235/524C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96
Inventor 吴赟李鑫温广武王鑫昊仲诚孙志远李俐王洪升韦其红邵长涛孙成功
Owner SHANDONG UNIV OF TECH
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