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A kind of preparation method of boron nitride interface coating of ceramic matrix composite material

A technology of interface coating and boron nitride, which is applied in the direction of metal material coating process, coating, gaseous chemical plating, etc., can solve the problems of blocked pipelines, damage to fiber mechanical properties, high preparation temperature, etc., and achieve a large deposition area , Improve the strength retention rate and high deposition efficiency

Active Publication Date: 2017-09-29
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, traditional BX 3 -NH 3 The system will generate corrosive gas during the reaction process, and the generated NH 4 X blocks the pipeline, and the preparation temperature is high, which will damage the mechanical properties of the fiber

Method used

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  • A kind of preparation method of boron nitride interface coating of ceramic matrix composite material
  • A kind of preparation method of boron nitride interface coating of ceramic matrix composite material
  • A kind of preparation method of boron nitride interface coating of ceramic matrix composite material

Examples

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Effect test

Embodiment 1

[0047] A preparation method of boron nitride interface coating on the surface of alumina fiber, the steps are:

[0048] (1) Purify and pretreat 10 bundles of alumina fibers with a length of 14cm and 500 / bundle. The pretreatment process is as follows: first put them in acetone and ultrasonically clean them for 50 minutes, and then place them in a muffle furnace in an air atmosphere. Heating, the heating temperature is 500°C, the heating time is 2h, and the furnace cools down to room temperature to remove the glue on the surface of the alumina fiber;

[0049] (2) The alumina fiber obtained in step (1) is fixed on a solid quartz support with a right-angled triangle in cross section. The inclined plane of the support is 15 cm long and the inclination angle is 5 °. Then the solid quartz support is placed on a horizontally placed hot wall In the deposition tube reaction chamber in the CVD deposition furnace, the total length of the quartz tube (quartz deposition tube) is 1.2m, and i...

Embodiment 2

[0057] A preparation method of silicon nitride fiber boron nitride interface coating, the steps are:

[0058] (1) Purify and pretreat 10 bundles of silicon nitride fibers with a length of 14cm and 500 strands per bundle. The pretreatment process is as follows: first put them in acetone for ultrasonic cleaning for 50 minutes, and then place them in a muffle furnace in an air atmosphere Heating, the heating temperature is 500 ° C, the heating time is 2 hours, and the furnace cools down to room temperature to remove the surface coating of the silicon nitride fiber;

[0059](2) the silicon nitride fiber that step (1) is obtained is fixed on the solid quartz support that cross section is a right triangle, and the inclined plane of support is long 15cm, and the inclination angle is 5 °, then solid quartz support is placed in the heat that places horizontally In the reaction chamber of the deposition tube in the wall CVD deposition furnace, the total length of the deposition tube is ...

Embodiment 3

[0067] A preparation method of boron nitride interface coating on the surface of alumina fiber, the steps are:

[0068] (1) Purify and pretreat 10 bundles of alumina fibers with a length of 10 cm and 500 fibers per bundle. The pretreatment process is as follows: first put them in acetone and ultrasonically clean them for 50 minutes, and then place them in a muffle furnace in an air atmosphere. Heating, the heating temperature is 500°C, the heating time is 2h, and the furnace cools down to room temperature to remove the glue on the surface of the alumina fiber;

[0069] (2) The alumina fiber obtained in step (1) is fixed on a solid quartz support whose cross section is a right triangle. The inclined plane of the support is 11 cm long and the inclination angle is 8 °. Then the solid quartz support is placed on a horizontally placed hot wall In the reaction chamber of the deposition tube in the CVD deposition furnace, the total length of the deposition tube is 1.2m, and its cente...

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Abstract

The invention relates to a method for manufacturing a ceramic matrix composite boron nitride interface coating, in particular to manufacturing of boron nitride coatings on a fiber surface and a substrate surface and belongs to the technical field of ceramic matrix composite toughness improvement. According to the method, a single component NH3BH3 containing B and N at the same time is selected as a precursor of a BN interface, the precursor is free of toxin and pollution, unlikely to burn or explode and capable of easily forming BN at the stoichiometric ratio of B:N=1:1, it is guaranteed that the manufactured BN is good in stoichiometric ratio, the problem that B and N in a double-component precursor are disproportionate is avoided, and no corrosive gas is generated in the manufacturing process. The method can be used for manufacturing the coating at the reaction temperature from 400 DEG C to 900 DEG C through a low-temperature chemical vapor deposition method, the temperature from 700 DEG C to 900 DEG C is preferred to increase the yield of BN, and the content of the obtained deposition product BN is over 97%. The strength retention rate of fibers can be increased as much as possible through low-temperature deposition, the strength retention rate is over 90% after deposition, and the strength retention rate is over 70% after high-temperature thermal treatment.

Description

technical field [0001] The invention relates to a method for preparing a boron nitride interface coating of a ceramic matrix composite material, in particular to the preparation of a boron nitride coating on a fiber surface and a substrate surface, and belongs to the technical field of toughness design of a ceramic matrix composite material. Background technique [0002] Ceramic matrix composites (ceramic matrix composites) are composed of continuous ceramic fibers, ceramic matrix and interfacial layers formed spontaneously or artificially. Ceramic matrix composites have excellent properties such as low density, high strength, high temperature resistance, corrosion resistance, oxidation resistance, and good toughness, and have important applications in my country's aerospace industry. Such as the combustion chamber of the turbofan engine, the fixed blade, the missile radome, the thermal protection system of the aerospace vehicle, etc. [0003] The toughness of ceramic matri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/34C23C16/448
CPCC23C16/342C23C16/4481
Inventor 王驰孙妮娟焦丽颖张大海张娟
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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