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A kind of composite coating of chopped SIC fiber, SIBCN ceramic composite material and preparation method

A technology of ceramic composite materials and composite coating, applied in the field of ceramic composite materials, can solve the problems of insufficient toughening mechanism, and achieve the effects of high productivity, improved fracture toughness and flexural strength, and short cycle time

Active Publication Date: 2021-11-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, the combination of SiC fiber and matrix interface is too strong or too weak, which will lead to the inability to fully exert the toughening mechanism.

Method used

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  • A kind of composite coating of chopped SIC fiber, SIBCN ceramic composite material and preparation method
  • A kind of composite coating of chopped SIC fiber, SIBCN ceramic composite material and preparation method
  • A kind of composite coating of chopped SIC fiber, SIBCN ceramic composite material and preparation method

Examples

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preparation example Construction

[0037] The invention provides a method for preparing a composite coating of chopped SiC fibers, comprising the following steps:

[0038] In order to remove impurities on the surface of SiC fibers and possible SiO 2 To remove the oxide layer and improve the dispersion of SiC fibers, a series of pretreatments are required, mainly including three parts: heat treatment degumming, dispersion pickling, and filtration drying.

[0039] SiC fiber pretreatment step: shorten the SiC fiber to 2-6mm and place it in a muffle furnace for heat treatment at 500-800°C for 1-3 hours; during the heat treatment process, the temperature is too low to remove the degumming effect, which is for effective degumming. The temperature must be greater than 500°C. In addition, the glue can be effectively removed by controlling the temperature within 800°C, and the fiber strength retention rate will decrease if the temperature is too high. In the heat treatment process, if the time is short, the degumming ...

Embodiment 1

[0052] Cut the SiC fiber to about 2mm and put it into an alumina crucible, heat treatment in a muffle furnace, heat up to 600°C at a rate of 8°C / min, hold for 2h, and cool with the furnace in the atmosphere of air.

[0053] Weigh about 0.5g of the treated SiC fiber and add it to 300mL of absolute ethanol, vibrate for 30min at an ultrasonic frequency of 25kHz to disperse the SiC fiber evenly, then filter and rinse the SiC fiber with distilled water;

[0054] Move the SiC fibers to a polytetrafluoroethylene beaker, add 375mL of distilled water, shake and stir in an ultrasonic cleaner for 5 minutes to make the fibers evenly dispersed, then add 25mL of hydrofluoric acid with a mass concentration of 40%, and stir at a stirring speed of 800r / min. Stir for 24 hours to obtain a suspension in which SiC fibers are evenly dispersed;

[0055] Filter the resulting suspension and rinse the SiC fiber with distilled water until the pH of the filtrate = 7, then move the SiC fiber to a petri di...

Embodiment 2

[0058] The difference between this example and Example 1 is that the heat treatment temperature is 500° C., the holding time is 1 hour, and the fibers are shortened to 4 mm. This example can reduce fiber crystallization and damage. Other steps are identical with embodiment 1.

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Abstract

The invention provides a composite coating of chopped SiC fibers, a SiBCN ceramic composite material and a preparation method thereof, and relates to the field of ceramic composite materials. The preparation method of a composite coating of chopped SiC fibers comprises the following steps: SiC fiber pretreatment step : SiC fibers are subjected to heat treatment, dispersive pickling and filter drying to obtain pretreated fibers; the preparation steps of the amorphous C coating: take silver powder, press the silver powder into silver flakes, place the silver flakes In a graphite crucible with a double-layer structure, and cut the graphite paper with the required hole size, separate the upper and lower layers of the graphite crucible with the graphite paper, and then place the SiC fiber in the middle of the graphite paper; The graphite crucible of silver sheet, graphite paper and SiC fiber is placed in a hot-press furnace for heat treatment to obtain SiC fiber modified by amorphous C coating. The preparation method of the composite coating of the chopped SiC fiber of the present invention has the advantages of short period, high yield, safety and environmental protection, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to the technical field of ceramic composite materials, in particular to a composite coating of chopped SiC fibers, a SiBCN ceramic composite material and a preparation method. Background technique [0002] With the rapid development of aviation, aerospace, energy and other technologies, various fields have put forward more stringent requirements for the performance of structural materials serving under high temperature or even ultra-high temperature conditions. At present, high-temperature structural materials mainly include refractory metals, refractory metal compounds, ceramics and ceramic-based composite materials, etc., each of which has its unique and excellent properties, but it is often not satisfactory when used alone, such as Cf / C composite materials. Although the material has good high-temperature mechanical and thermal properties, its oxidation resistance is poor; SiC, Si 3 N 4 Ceramics have the characteristics of hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/628C04B35/80C04B35/622C04B35/58
CPCC04B35/58C04B35/622C04B35/62857C04B35/62868C04B35/62873C04B35/62876C04B35/62894C04B2235/386C04B2235/425C04B2235/428C04B2235/5244C04B2235/656C04B2235/6562C04B2235/6567
Inventor 杨治华于明廖兴祺周沅逸贾德昌蔡德龙何培刚段小明王胜金周玉
Owner HARBIN INST OF TECH
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