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Method for preparing hexagonal boron nitride interface coating

A technology of hexagonal boron nitride and interface coatings, which is applied in the field of preparation of hexagonal boron nitride interface coatings, can solve the problems of difficulty in forming uniform coatings, corrosion or toxicity, and high preparation costs, and achieve strong designability, Low oxygen content and good uniformity

Inactive Publication Date: 2011-09-14
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the above-mentioned methods of preparing boron nitride interface coatings on the surface of fibers, there are certain deficiencies: first, it is difficult to generate a uniform coating on the surface of fiber bundles; secondly, the reactant gas used or the by-products generated are corrosive or toxicity; again, the preparation cost is too high

Method used

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  • Method for preparing hexagonal boron nitride interface coating
  • Method for preparing hexagonal boron nitride interface coating
  • Method for preparing hexagonal boron nitride interface coating

Examples

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Effect test

Embodiment 1

[0023] Step 1: Select T300 2D plain woven carbon cloth, weave the fibers into 2D woven cloth in the directions of 0° and 90°, and laminate them to form a fiber prefabricated body with a size of 25mm×25mm×3mm as the base material ;

[0024] Step 2: Hang the fiber prefabricated body base material on the sample rack of the deposition furnace, and the sample rack is at the center of the isothermal zone in the furnace;

[0025] Step 3: Take BCl 3 -H 2 Preparation of elemental boron film on the substrate for the precursor, reaction temperature: 1000°C, holding time: 20 hours, furnace pressure: 400Pa;

[0026] Step 4: Carry out nitriding treatment on the preform containing boron coating in step 3, nitriding temperature: 1300°C, holding time: 10 hours, furnace pressure: 1000Pa, atmosphere is NH 3 -N 2 -H 2 , to get hexagonal boron nitride interface coating.

[0027] The fiber in step 1 is woven into a fiber prefabricated body with a size of 25mm×25mm×3mm as a base material by a ...

Embodiment 2

[0031] Step 1: Process the graphite into a block sample with a specification of 20mm×10mm×2mm as the base material, grind and polish the surface of the substrate, use alcohol to ultrasonically clean the substrate, and use it after drying;

[0032] Step 2: Hang the graphite base material on the sample holder of the deposition furnace, and the sample holder is at the center of the isothermal zone in the furnace;

[0033] Step 3: Take BCl 3 -H 2 Preparation of elemental boron film on the substrate as a precursor, reaction temperature: 900°C, holding time: 60 hours, furnace pressure: 1000Pa;

[0034] Step 4: Perform nitriding treatment on the preform containing boron coating in step 3, nitriding temperature: 1500°C, holding time: 10 hours, furnace pressure: 400Pa, atmosphere is NH 3 -N 2 -H 2 , to get hexagonal boron nitride interface coating.

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Abstract

The invention relates to a method for preparing a hexagonal boron nitride interface coating, which comprises the following steps of: preparing a fiber preform or a high-purity graphite substrate, performing chemical vapor deposition on a boron elementary substance, and nitriding the boron elementary substance. The method is high in designability and repeatability and simple in process. The prepared boron nitride interface coating has a graphite-like layer structure, high crystallinity and low oxygen content, is compact and uniform, can meet the requirement of a ceramic-based composite material anti-oxidation interface coating, and also can be popularized to a substrate or a surface coating material.

Description

technical field [0001] The invention relates to a preparation method of a hexagonal boron nitride interface coating, in particular to a preparation method for forming a BN interface coating by in-situ nitriding reaction of elemental boron. Background technique [0002] Pyrolytic carbon (PyC) is often used as an interfacial coating for fiber-toughened silicon carbide ceramic matrix composites (C / SiC and SiC / SiC composites), exhibiting excellent mechanical properties; however, its oxidation resistance is poor, At low temperature (≈450°C), it will be rapidly oxidized to CO 2 and CO, leading to material failure, which greatly limits the application range and service life of C / SiC and SiC / SiC composite materials. The hexagonal boron nitride interface coating has a good layered structure, and in an oxygen-containing environment above 600°C, it can generate liquid B 2 o 3 self-healing phase. Therefore, using hexagonal boron nitride interface coating instead of PyC as the interf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
CPCC04B35/62868C04B35/62884C04B2235/5244C04B2235/5248C04B2235/5256
Inventor 刘永胜张立同成来飞叶昉
Owner NORTHWESTERN POLYTECHNICAL UNIV
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