Preparation method of boron nitride coating on fiber surface

A fiber surface, boron nitride technology, applied in the field of preparation of boron nitride coating on the fiber surface, can solve the problems of inflammability and explosion, toxic raw material gas, difficult to handle, etc., and achieve smooth, uniform, dense and uniform thickness of the coating surface Consistent, saturated vapor pressure results

Active Publication Date: 2011-08-31
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many disadvantages in the preparation of boron nitride coatings using these precursors as raw materials: the raw material gas

Method used

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  • Preparation method of boron nitride coating on fiber surface
  • Preparation method of boron nitride coating on fiber surface
  • Preparation method of boron nitride coating on fiber surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Put the 2.5D T300 carbon fiber braid in the organic solvent acetone for ultrasonic cleaning to remove surface dust and other pollutants, and put it into the deposition furnace after drying; (2) Vacuum the deposition furnace, fill it with nitrogen, and repeat it three times , to replace the air in the deposition furnace; (3) evacuate the deposition furnace to 0.1 Pa, and raise the temperature to 1100 °C; (4) After the temperature stabilizes, introduce carrier gas nitrogen, the flow rate of carrier gas is 200 ml / min, and the system pressure is maintained at 1000Pa; the carrier gas brings borazine into the hearth of the deposition furnace by bubbling, and the holding temperature of the bubbling bottle is 0 ℃. After 2 hours, the boron nitride coating is formed; (5) After the deposition is completed, stop introducing the carrier gas, turn off the heating system, and cool down to room temperature with the furnace to obtain the hexagonal boron nitride coating deposited on t...

Embodiment 2

[0027] (1) Put the 2.5D quartz fiber braid in the organic solvent acetone for ultrasonic cleaning to remove surface dust and other pollutants, and put it into the deposition furnace after drying; (2) Same as step (2) of Example 1; (3) For The deposition furnace was evacuated to 0.5 Pa, and the temperature was raised to 800 °C; (4) After the temperature stabilized, the carrier gas nitrogen was introduced, the carrier gas flow rate was 100 ml / min, and the system pressure was maintained at 1100 Pa; The borazine is brought into the hearth of the deposition furnace, and the temperature of the bubbling bottle is -5 ℃. The boron nitride decomposed by borazine in the hearth of the deposition furnace is deposited on the surface of the fiber, and the deposition time is 2 hours to form a boron nitride coating; (5) After the deposition is over, stop introducing the carrier gas, turn off the heating system, and cool down to room temperature with the furnace, and the hexagonal boron nitride ...

Embodiment 3

[0030](1) Put the 2.5D silicon carbide fiber braid in the organic solvent acetone for ultrasonic cleaning to remove surface dust and other pollutants, and put it into the deposition furnace after drying; (2) Same as step (2) of Example 1; (3) Vacuum the deposition furnace to 0.2 Pa, and raise the temperature to 1100 °C; (4) After the temperature stabilizes, introduce carrier gas nitrogen, the carrier gas flow rate is 150 ml / min, and the system pressure is maintained at 800 Pa; The azine is brought into the hearth of the deposition furnace, and the holding temperature of the bubbling bottle is 5 °C. The boron nitride decomposed by boron azine in the hearth of the deposition furnace is deposited on the surface of the fiber, and the deposition time is 2 hours to form a boron nitride coating; (5) After the deposition is over, stop introducing the carrier gas, turn off the heating system, and cool down to room temperature with the furnace, and the hexagonal boron nitride coating dep...

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Abstract

The invention provides a preparation method of a boron nitride coating on a fiber surface, comprising the following steps: (1) ultrasonically cleaning a fiber braid in acetone to remove contaminants on the surface, drying and placing the fiber braid in a deposition furnace; (2) evacuating the deposition furnace, and introducing nitrogen gas; (3) evacuating the deposition furnace to 0.01-1 Pa, and heating to 500-1,800 DEG C; (4) introducing carrier gas and dilute gas in such a manner that the carrier gas can carry borazine into the deposition furnace in a bubbling manner to ensure boron nitride to deposit on the fiber surface so as to form a boron nitride coating; and (5) stopping the introduction of the carrier gas and the dilute gas after the deposition finishes, closing the heating system, and cooling to the room temperature along with the furnace. According to the method, the boron nitride can be well deposited on the surface, inside and crossing points of the fiber braid, and the boron nitride coating with uniform, smooth and dense surface and uniform thickness can be deposited on the surface of each fiber in a fiber bundle.

Description

technical field [0001] The invention relates to a method for preparing a boron nitride coating, in particular to a method for preparing a boron nitride coating on a fiber surface. Background technique [0002] Continuous fiber-reinforced ceramic matrix composites have become ceramic matrix composite materials due to their good reinforcement and toughening effects, excellent thermal shock resistance, large damage tolerance, and non-catastrophic failure (with plastic fracture behavior similar to metals). The main direction of material development. [0003] The structure of fiber reinforced ceramic matrix composites includes fibers, matrix and interfacial phase between fibers and matrix. The performance of continuous fiber-reinforced ceramic matrix composites not only depends on the properties of fibers and matrix, but more importantly, the performance matching of fibers, interface phase and matrix. The interface plays a decisive role in the performance of ceramic matrix comp...

Claims

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Application Information

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IPC IPC(8): C04B35/84C04B35/80
CPCC04B35/62868C04B35/62884C04B35/62897C04B2235/5232C04B2235/5244C04B2235/5248
Inventor 李俊生李斌张长瑞王思青刘荣军曹峰
Owner NAT UNIV OF DEFENSE TECH
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