Unlock instant, AI-driven research and patent intelligence for your innovation.

A hybrid matrix SICF/SIC composite material and its preparation method

A composite material and matrix technology, applied in the field of hybrid matrix SiCf/SiC composite materials and its preparation, can solve the problems of high cost, high porosity, and low mechanical properties

Active Publication Date: 2021-04-27
NAT UNIV OF DEFENSE TECH
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the industry mainly adopts a single PIP or CVI process to prepare SiCf / SiC composite materials. The existing problems mainly include: (1) high porosity (generally higher than 17%); (2) microstructure uniformity caused by high porosity Low, poor performance stability; (3) Long preparation cycle (generally more than 1 month), high cost; (4) Relatively low mechanical properties, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A hybrid matrix SICF/SIC composite material and its preparation method
  • A hybrid matrix SICF/SIC composite material and its preparation method
  • A hybrid matrix SICF/SIC composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a SiCf / SiC composite material mixed with a SiC matrix, comprising the following steps:

[0038] (1) The 2.5D woven SiC fiber preform (fiber volume fraction is 45%) was removed at 800°C for 0.5 hours under an inert atmosphere, and a PyC interface layer was deposited on the surface. The thickness of the interface layer was about 200~300 nm .

[0039] (2) Bring the above-mentioned prefabricated part of the deposited interface layer into the reaction furnace cavity by bubbling trichloromethylsilane (MTS) with hydrogen in the SiC deposition furnace. The flow rates of Ar and Ar are 300 mL / min and 200 mL / min respectively, the reaction temperature is controlled at 1075 ° C, and the pressure of the reaction furnace chamber is 1400 Pa. After deposition for 50 to 55 hours, an intermediate deposited with a CVI SiC substrate is obtained. The density of the intermediate is 2.006g / cm 3 .

[0040] (3) Vacuum impregnate the above intermediate with a xylene solu...

Embodiment 2

[0043] A method for preparing a SiCf / SiC composite material mixed with a SiC matrix, comprising the following steps:

[0044] (1) The three-dimensional four-way braided SiC fiber preform (fiber volume fraction is 50%) is degummed at 700°C under an inert atmosphere for 0.5 hours, and a PyC interface layer is deposited on its surface. The thickness of the interface layer is about 200~300 nm.

[0045] (2) Bring the above-mentioned prefabricated part of the deposited interface layer into the reaction furnace cavity by bubbling trichloromethylsilane (MTS) with hydrogen in the SiC deposition furnace. The flow rates of Ar and Ar are 280 mL / min and 190 mL / min respectively, the reaction temperature is controlled at 1070 ° C, and the pressure of the reaction furnace chamber is 1300 Pa. After deposition for 48 to 50 hours, an intermediate deposited with a CVI SiC substrate is obtained. The density of the intermediate is 1.98g / cm 3 .

[0046] (3) Vacuum impregnate the above intermediat...

Embodiment 3

[0049] A method for preparing a SiCf / SiC composite material mixed with a SiC matrix, comprising the following steps:

[0050] (1) The 2.5D braided SiC fiber preform (fiber volume fraction 40%) was degummed at 800°C for 0.5 hours under an inert atmosphere, and a BN interface layer was deposited on the surface. The thickness of the interface layer was about 200~300 nm .

[0051] (2) Bring the above-mentioned prefabricated part of the deposited interface layer into the reaction furnace cavity by bubbling trichloromethylsilane (MTS) with hydrogen in the SiC deposition furnace. The flow rates of Ar and Ar are 320 mL / min and 210 mL / min respectively, the reaction temperature is controlled at 1080 ° C, and the pressure of the reaction chamber is 1500 Pa. After deposition for 50 to 60 hours, an intermediate deposited with a CVI SiC substrate is obtained. The density of the intermediate is 2.1g / cm 3 .

[0052] (3) Vacuum impregnate the above-mentioned intermediate in a xylene solutio...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
thicknessaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention provides a hybrid matrix SiCf / SiC composite material and a preparation method thereof, the method comprising: pretreating a SiC fiber prefabricated part, and depositing a PyC interface layer or a BN interface layer on the surface of the SiC fiber prefabricated part ; The SiC fiber preform of the deposition interface layer is placed in a SiC deposition furnace, trichloromethylsilane is used as a source gas with hydrogen bubbles, and argon is used as a dilution gas to obtain an intermediate deposited with a CVI SiC substrate; the intermediate is vacuum Immerse in polycarbosilane solution to obtain PIP SiC matrix, and repeat the PIP cycle 5-6 times at the same time to obtain hybrid matrix SiCf / SiC composite material. The method of the invention significantly reduces the closed cell ratio of the prepared composite material, improves its density and microstructure uniformity, and significantly improves its mechanical properties and performance stability.

Description

technical field [0001] The invention relates to the technical field of preparation of SiCf / SiC composite materials, in particular to a hybrid matrix SiCf / SiC composite material and a preparation method thereof. Background technique [0002] In order to develop a new generation of more efficient and more environmentally friendly aero-engines, the thrust and thrust-to-weight ratio need to be continuously improved. Therefore, the temperature at the front inlet of the turbine needs to be continuously increased. extremely demanding challenges. It is generally believed that the temperature resistance limit of nickel-based superalloys is 1150 °C, which cannot meet the operating temperature requirements of the new generation of aero-engines. Therefore, it is necessary to develop new materials with better temperature resistance. Compared with metal materials, ceramic materials have extremely excellent temperature resistance, which mainly depends on the strong combination of covalent...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/571C04B35/80C04B35/622C04B35/628
CPCC04B35/571C04B35/622C04B35/62868C04B35/62873C04B2235/5244C04B2235/614C04B2235/616C04B2235/77
Inventor 王衍飞刘荣军万帆王甫
Owner NAT UNIV OF DEFENSE TECH