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Silicon nitride fiber reinforced silica ceramic matrix composite material and its preparation method and application

A technology of silicon nitride fiber and composite materials, which is applied in the direction of the radiation unit cover, etc., can solve the problems of cumbersome preparation process, poisoning, and expensive precursor polyborazane, and achieve simple preparation, good anti-oxidation performance, and shorten the preparation time. cycle effect

Active Publication Date: 2019-11-22
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reinforcing body selected in this invention is silicon nitride fiber, and its service temperature can reach above 1400°C. It has good high temperature resistance and excellent dielectric properties, but the precursor polyborazane is expensive and has a certain poisonous effect on the human body. , the preparation process is more cumbersome

Method used

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  • Silicon nitride fiber reinforced silica ceramic matrix composite material and its preparation method and application
  • Silicon nitride fiber reinforced silica ceramic matrix composite material and its preparation method and application

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Embodiment 1

[0029] A kind of Si of the present invention 3 N 4f / SiO 2 Composite materials, including Si 3 N 4 Unidirectional Si obtained by unidirectional laying of fiber bundles 3 N 4 fiber preforms, and uniformly filled in the unidirectional Si 3 N 4 SiO in the pores of fiber preforms 2 Ceramic substrate. Among them, SiO 2 Ceramic substrate in Si 3 N 4f / SiO 2 The volume fraction in the composite is 36.9%.

[0030] A kind of Si of above-mentioned present embodiment 3 N 4f / SiO 2 The preparation method of composite material, comprises the following steps:

[0031] (1) Preparation of fiber preforms: Si 3 N 4 The fiber bundles were arranged in one direction and fixed by a mold to prepare a unidirectional silicon nitride fiber preform with a fiber volume fraction of 39.6%.

[0032] (2) Debinding treatment: place the unidirectional silicon nitride fiber preform obtained in step (1) in a vacuum furnace, and vacuumize to 10 -2 MPa, heated to 500°C at a heating rate of 10°C...

Embodiment 2

[0037] A kind of Si of the present invention 3 N 4f / SiO 2 composite materials, including the use of Si 3 N 4 Two-dimensional semi-Si prepared by weaving and piercing fiber bundles 3 N 4 Fiber preforms, and uniformly filled in the two-dimensional semi-Si 3 N 4 SiO in the pores of fiber preforms 2 Ceramic substrate. Among them, SiO 2 Ceramic substrate in Si 3 N 4f / SiO 2 The volume fraction in the composite is 37.4%.

[0038] A kind of Si of above-mentioned present embodiment 3 N 4f / SiO 2 The preparation method of composite material, comprises the following steps:

[0039] (1) Preparation of fiber preforms: Si 3 N 4 A two-dimensional silicon semi-nitride fiber preform with a fiber volume fraction of 28.4% was prepared by weaving and puncturing the fiber bundles.

[0040] (2) Debinding treatment: put the two-dimensional silicon semi-nitride fiber preform obtained in step (1) in a vacuum furnace, and evacuate to 10 -2 After MPa, the organic glue (Si 3 N 4 T...

Embodiment 3

[0048] A kind of Si of the present invention 3 N 4f / SiO 2 composite materials, including the use of Si 3 N 4 Three-dimensional Si with a volume fraction of 32% prepared by weaving fiber bundles 3 N 4 Fiber preforms, and uniformly filled in the three-dimensional Si 3 N 4 SiO in the pores of fiber preforms 2 Ceramic substrate. Among them, SiO 2 Ceramic substrate in Si 3 N 4f / SiO 2 The volume fraction in the composite is 38.2%.

[0049] A kind of Si of above-mentioned present embodiment 3 N 4f / SiO 2 The preparation method of composite material, comprises the following steps:

[0050] (1) Preparation of fiber preforms: Si 3 N 4 The fiber bundles were braided to prepare a three-dimensional silicon nitride fiber preform with a fiber volume fraction of 32.0%.

[0051] (2) Debinding treatment: Place the three-dimensional silicon nitride fiber preform obtained in step (1) in a vacuum furnace and vacuumize to 10 -2 MPa, heated to 600°C at a heating rate of 5°C / min...

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Abstract

The invention discloses a silicon nitride fiber reinforced silicon dioxide ceramic based composite and a preparation method and application of the silicon nitride fiber reinforced silicon dioxide ceramic based composite. The silicon nitride fiber reinforced silicon dioxide ceramic based composite comprises an Si3N4 fiber prefabricate and an SiO2 ceramic base, and the SiO2 ceramic base is evenly put in holes of the Si3N4 fiber prefabricate. The preparation method comprises the following steps: (1) removing a binder from the Si3N4 fiber prefabricate in the vacuum or inertia atmosphere; (2) preparing an Si3N4 / SiO2 composite intermediate through the processes of impregnating in vacuum, drying a gel and sintering; and (3) decarbonizing thermally in the aerobic environment. The composite has the advantages of high temperature resistance, ablation resistance, scouring resistance, excellent oxidation resistance, strong carrying capacity and excellent dielectric property, and has an excellent application value in the field of high temperature wave transmitting material; and the preparation method is simple in process and relatively low in cost and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of fiber-reinforced ceramic-based composite materials, and in particular relates to a silicon nitride fiber-reinforced silicon dioxide ceramic-based composite material and its preparation method and application. Background technique [0002] With the rapid development of high-speed aircraft, high-temperature wave-transparent materials for radome or antenna window are facing severe challenges, and it is urgent to continuously improve their comprehensive performance, including: long-term high-temperature bearing capacity, excellent high-temperature and room-temperature dielectric properties (dielectric properties) Electrical constant ε<4, loss tangent tanδ<0.01), excellent thermal shock resistance, good ablation resistance, low thermal conductivity and thermal expansion coefficient, and good environmental resistance, etc. [0003] At present, fiber-reinforced silica composites have been widely used in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/14C04B35/628H01Q1/42
CPCH01Q1/42C04B35/14C04B35/62873C04B2235/77C04B2235/96C04B2235/616C04B2235/524
Inventor 李斌杨雪金王思青张长瑞李端刘荣军
Owner NAT UNIV OF DEFENSE TECH
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