Preparation method of boron nitride fiber enhanced nitride ceramic-based composite material

A technology of nitride ceramics and boron nitride fibers, applied in the direction of radiation unit cover, etc., can solve the problems that limit the wide application, preparation and performance of boron nitride fiber reinforced ceramic matrix composites. The effect of low technical level requirements and simple process

Inactive Publication Date: 2017-07-28
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Abstract
  • Description
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Problems solved by technology

[0004] At present, due to the complexity of boron nitride fiber preparation technology, its industrialized large-scale production is limited. The difference between the production process and some characteristics of other ceramic fibers has led to few research reports on the preparation and performance of boron nitride fiber and boron nitride fiber reinforced ceramic matrix composites, which limits the development of boron nitride fiber reinforced ceramic matrix composites. Wide application of materials

Method used

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  • Preparation method of boron nitride fiber enhanced nitride ceramic-based composite material

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Experimental program
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Effect test

Embodiment 1

[0029] Such as figure 1 As shown, the boron nitride fiber is first cut into short fibers with a length of 5 mm, and then ball milled with a fast mill, and the fiber length-to-diameter ratio after ball milling is controlled to be 15;

[0030] Weigh the nitride powder according to the proportion of each substance, and the mass ratio of BN powder: Si 3 N 4 Powder = 1:9, plus 3% of the nitride powder quality of the sintering aid alumina, nitride powder and 3% of the total mass of the sintering aid nano-SiO 2 Powder, ethanol dispersion, adding 3% boron nitride short fiber of all powder mass, the mass ratio of the total mass of all the above components to ethanol is 1:2.5, the material of the grinding ball is silicon nitride ball, the total mass of all the above components and the mass ratio of the grinding The mass ratio of the balls is 1:1.5, the mixture is put into a ball mill jar and milled on a rolling mill for 3 hours at a speed of 170 rpm;

[0031] The slurry after mixing ...

Embodiment 2

[0035] First cut the boron nitride fiber into short fibers with a length of 6 mm, and then use a fast mill for ball milling, and control the fiber aspect ratio after ball milling to 17;

[0036] Weigh the nitride powder according to the proportion of each substance, and the mass ratio of BN powder: Si 3 N 4 powder=1:5, plus 7% of the nitride powder quality sintering aid yttrium oxide, nitride powder and 7% nano-SiO of the total mass of the sintering aid 2 Powder, ethanol dispersion, adding 12% boron nitride short fiber of all powder mass, the mass ratio of the total mass of all the above components to ethanol is 1:2.0, the material of the grinding ball is silicon nitride ball, the total mass of all the above components and the mass ratio of the grinding The mass ratio of the balls is 1:1, the mixture is put into a ball mill jar and ball milled on a rolling mill for 8 hours at a speed of 150 rpm;

[0037] The slurry after mixing and ball milling is put into a drying box for d...

Embodiment 3

[0041] First cut the boron nitride fiber into short fibers with a length of 7mm, and then use a fast mill for ball milling, and control the fiber aspect ratio after ball milling to 20;

[0042]Weigh the nitride powder according to the proportion of each substance, and the mass ratio of BN powder: Si 3 N 4 Powder=1:1, plus 3% nitride powder mass of sintering aids, a mixture of alumina and yttrium oxide, 12% of the total mass of nitride powders and sintering aids, nano-SiO 2 Powder, ethanol dispersion, adding 20% ​​boron nitride short fiber of all powder mass, the mass ratio of the total mass of all the above components to ethanol is 1:1.8, the material of the grinding ball is silicon nitride ball, the total mass of all the above components and the mass ratio of the grinding The mass ratio of the balls is 1:1.3, the mixture is put into a ball mill jar and milled on a rolling mill for 3 hours at a speed of 190 rpm;

[0043] The slurry after mixing and ball milling is put into a...

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Abstract

The invention discloses a preparation method of a boron nitride fiber enhanced nitride ceramic-based composite material. The preparation method is characterized by comprising the following steps: mixing and ball-milling boron nitride short fibers, nitride powder and sintering aid powder; and performing hot pressed sintering to obtain the boron nitride fiber enhanced nitride ceramic-based composite material, wherein the length-diameter ratio of the boron nitride short fibers is (15-35): 1 and the adding amount of the boron nitride short fibers accounts for 3-20% by mass of all powder. The preparation method disclosed by the invention is simple in process, suitable for industrial operation and low in requirement on technical level of operators. The density of the composite material prepared by the preparation method reaches 1.9-2.95g / cm<3>, the tensile strength is greater than 50MPa, the bending strength is greater than 90MPa, the coefficient of linear expansion is less than 3.5*10<-6> (room temperature to 1200 DEG C), the dielectric constant (Ku waveband) is less than 5.5, and the dielectric loss (Ku waveband) is less than 8*10<-3>.

Description

technical field [0001] The invention belongs to the technical field of ceramic matrix composite materials, and relates to a preparation method of boron nitride fiber reinforced nitride ceramic matrix composite materials. Background technique [0002] The radome is located at the head of the missile. It is not only a structural part of the missile body, but also an important part of the radio homing guidance system. Structural / functional parts. As the flight Mach number of the missile continues to increase, the radome at the highest position of the missile's aerodynamic force and aerodynamic heat needs to withstand higher and higher temperatures and thermal shocks. Therefore, the development of ultra-high temperature resistant materials with good mechanical properties, excellent ablation resistance and thermal shock resistance is one of the bottlenecks restricting the development of missile technology, and it is also a research hotspot in countries all over the world. Fused...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/583C04B35/584C04B35/5835H01Q1/42
CPCC04B35/806C04B35/583C04B35/584C04B2235/524C04B2235/77C04B2235/96C04B2235/9607H01Q1/42
Inventor 齐学礼张铭霞李茹栾强王洪升王重海韦其红唐建新
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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