Mullite fiber provided with SiBCN coating deposited on surface and preparation method of mullite fiber

A mullite fiber and coating technology, which is applied in the field of surface-coated mullite fiber and its preparation, can solve problems such as being unsuitable for preparing SiBCN, and achieves simple gas source control process, good high temperature stability, and simplified process Effect

Active Publication Date: 2015-05-13
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the SiBCN precursors used in the PDCs method are non-volatile polymers, they are not suitable for the preparation of SiBCN by the CVD process.

Method used

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  • Mullite fiber provided with SiBCN coating deposited on surface and preparation method of mullite fiber
  • Mullite fiber provided with SiBCN coating deposited on surface and preparation method of mullite fiber
  • Mullite fiber provided with SiBCN coating deposited on surface and preparation method of mullite fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] a kind of like Figure 1 ~ Figure 4 The shown surface of the present invention deposits the mullite fiber of SiBCN coating, comprises mullite fiber substrate and the SiBCN coating deposited on the mullite fiber substrate, and SiBCN coating is based on borazine and liquid polycarbosilane The raw material is prepared by a chemical vapor deposition process. The mullite fiber matrix in this embodiment is a mullite fiber monofilament, and the thickness of the SiBCN coating is 1000 nm.

[0041] The preparation method of the mullite fiber with the SiBCN coating deposited on the surface of the above-mentioned present embodiment comprises the following steps:

[0042] (1) Place the mullite fiber monofilament deposition piece in absolute ethanol for 0.5h ultrasonic cleaning to remove surface dust, organisms and other pollutants;

[0043] (2) Submerge the mullite fiber monofilament deposition piece after ultrasonic cleaning in the mullite sol, and then carry out ultrasonic dispe...

Embodiment 2

[0054] A kind of mullite fiber of the surface deposition SiBCN coating of the present invention, comprises the SiBCN coating that deposits on mullite fiber substrate and mullite fiber substrate, and SiBCN coating is based on borazine and liquid polycarbosilane The raw material is prepared by a chemical vapor deposition process. The mullite fiber matrix in this embodiment is mullite fiber bundle, and the thickness of the SiBCN coating is 700 nm.

[0055] The preparation method of the mullite fiber with the SiBCN coating deposited on the surface of the above-mentioned present embodiment comprises the following steps:

[0056] (1) Place the mullite fiber bundle deposition piece in acetone and ultrasonically clean it for 0.5h to remove surface dust, organisms and other pollutants;

[0057] (2) Submerge the mullite fiber bundle deposition piece after ultrasonic cleaning in the mullite sol, and then perform ultrasonic dispersion for 2.0 h;

[0058] (3) Take out the mullite fiber b...

Embodiment 3

[0065]A kind of mullite fiber of the surface deposition SiBCN coating of the present invention, comprises the SiBCN coating that deposits on mullite fiber substrate and mullite fiber substrate, and SiBCN coating is based on borazine and liquid polycarbosilane The raw material is prepared by a chemical vapor deposition process. The mullite fiber matrix in this embodiment is a mullite fiber braid, and the thickness of the SiBCN coating is 200 nm.

[0066] The preparation method of the mullite fiber with the SiBCN coating deposited on the surface of the above-mentioned present embodiment comprises the following steps:

[0067] (1) Place the mullite fiber braid in xylene for ultrasonic cleaning for 1.0 h to remove surface dust, organisms and other pollutants;

[0068] (2) Submerge the mullite fiber braid after ultrasonic cleaning in the mullite sol, and then carry out ultrasonic dispersion for 5.0 h;

[0069] (3) Take out the mullite fiber woven piece after ultrasonic dispersion...

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Abstract

The invention discloses mullite fiber provided with a SiBCN coating deposited on the surface. The mullite fiber comprises a mullite fiber matrix and the SiBCN coating deposited on the matrix, wherein the SiBCN coating is prepared from raw materials including borazine and liquid polycarbosilane with a CVD (chemical vapor deposition) process. A preparation method of the mullite fiber comprises the following steps: a mullite fiber deposition piece is placed in a solvent for cleaning, soaked in mullite sol for ultrasonic dispersion after cleaning, treated at high temperature in an atmosphere environment and placed in a depositing furnace; air in the depositing furnace is replaced; preheating is performed under set vacuum and temperature; carrier gas and diluent gas are introduced, borazine and liquid polycarbosilane are carried in by the carrier gas and diluted by the diluent gas, and SiBCN resolved by borazine and liquid polycarbosilane in a hearth of the depositing furnace is deposited gradually on the surface of the mullite fiber deposition piece to form the SiBCN coating. A product has uniform and compact coating, smooth surface and good high-temperature stability, and the antioxidant ability of the product can be improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of coated fibers in ceramic matrix composite materials, and in particular relates to a surface-coated mullite fiber and a preparation method thereof. Background technique [0002] In recent decades, mullite (3Al 2 o 3 2SiO2 2 ) ceramics have attracted extensive attention due to their good chemical stability, low thermal expansion coefficient, low thermal conductivity, low dielectric constant, and excellent creep resistance. Continuous mullite fiber is considered to be one of the most effective reinforcements for mullite ceramics because it does not have a glass phase and has good chemical stability. However, the application of mullite ceramics is largely limited by its strength and fracture toughness under high temperature environment. Mullite ceramic matrix composites reinforced with continuous mullite fibers (Mu f / Mu) When serving in an air environment above 1100 °C, the mullite fiber ...

Claims

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Application Information

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IPC IPC(8): C04B41/50
Inventor 程海峰李俊生刘海韬周永江郑文伟孙逊童思超
Owner NAT UNIV OF DEFENSE TECH
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