Method for preparing monocrystalline silicon carbide nanofiber/silicon carbide ceramic matrix composite material by reaction sintering

A technology of silicon carbide ceramic base and single crystal silicon carbide, which is applied in the field of preparation of silicon carbide composite materials, can solve the problems that the interface between SiCnf and matrix is ​​difficult to control, it is difficult to fully reflect the mechanical properties of SiC, and the volume content of SiCnf is small. Performance and service life, high density, high volume content effect

Active Publication Date: 2019-09-20
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above SiC ceramic matrix composites reinforced by SiC nanowires/fibers (SiCnf) grown in situ have a small volume content of SiCnf, the interface between SiCnf and the matrix is ​​difficult to control, and the growth quality of SiCnf is affected by the size and distribution of pores or gaps. Composite materials often There is a "bridging" effect,

Method used

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  • Method for preparing monocrystalline silicon carbide nanofiber/silicon carbide ceramic matrix composite material by reaction sintering
  • Method for preparing monocrystalline silicon carbide nanofiber/silicon carbide ceramic matrix composite material by reaction sintering
  • Method for preparing monocrystalline silicon carbide nanofiber/silicon carbide ceramic matrix composite material by reaction sintering

Examples

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Effect test

Embodiment 1

[0054] First, BN coated SiC nanofibers: Dissolve boric acid and urea in a mixture of ethanol and deionized water, wherein the mass ratio of boric acid and urea is 1:3, and the volume ratio of ethanol and deionized water is 2:1, and the heating configuration Boric acid and urea mixed saturated solution. 30g of SiC nanofibers were dipped into a beaker filled with a mixed solution of boric acid and urea, dipped and dried to obtain nanofibers with a coating layer. The coated SiC nanofibers were put into a tube furnace, and a nitriding reaction was carried out in a nitrogen atmosphere at a temperature of 1000° C., and kept for 1.5 hours to obtain BN-coated SiC nanofibers.

[0055] Then carbon coating: take 30g of BN-coated SiC nanofibers and place them in an alcohol solution filled with phenolic resin, wherein the mass ratio of phenolic resin to alcohol solution is 1:4; and dry. The carbon / BN-coated SiC nanofibers were placed in a tube furnace, sintered at a maximum temperature of...

Embodiment 2

[0061] First, BN coated SiC nanofibers, boric acid and urea were dissolved in a mixture of ethanol and deionized water, wherein the mass ratio of boric acid and urea was 2:3, and the volume ratio of ethanol and deionized water was 3:1, and the heating configuration Boric acid and urea mixed saturated solution. 30g of SiC nanofibers were dipped into a beaker filled with a mixed solution of boric acid and urea, dipped and dried to obtain nanofibers with a coating layer. The coated SiC nanofibers were put into a tube furnace, and a nitriding reaction was carried out in a nitrogen atmosphere at a temperature of 900° C., and kept for 1 hour to obtain BN-coated SiC nanofibers.

[0062] Then carbon coating: take 25g of BN-coated SiC nanofibers and place them in an alcohol solution filled with phenolic resin, wherein the mass ratio of phenolic resin to alcohol solution is 1:5; and dry. The carbon / BN-coated SiC nanofibers were placed in a tube furnace, sintered at a maximum temperatur...

Embodiment 3

[0068] First, BN coated SiC nanofibers, boric acid and urea were dissolved in a mixture of ethanol and deionized water, wherein the mass ratio of boric acid and urea was 2:3, and the volume ratio of ethanol and deionized water was 3:1, and the heating configuration Boric acid and urea mixed saturated solution. 35g of SiC nanofibers were dipped into a beaker filled with a mixed solution of boric acid and urea, dipped and dried to obtain nanofibers with a coating layer. The coated SiC nanofibers were put into a tube furnace, and a nitriding reaction was carried out in a nitrogen atmosphere at a temperature of 1200° C., and kept for 2 hours to obtain BN-coated SiC nanofibers.

[0069] Then carbon coating: take 35g of BN-coated SiC nanofibers and place them in an alcohol solution filled with phenolic resin, wherein the mass ratio of phenolic resin to alcohol solution is 1:4; and dry. The carbon / BN-coated SiC nanofibers were placed in a tube furnace, sintered at a maximum temperat...

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Abstract

The invention discloses a method for preparing a monocrystalline silicon carbide nanofiber/silicon carbide ceramic matrix composite material by reaction sintering. The method comprises the following steps: preparing a SiC nanofiber coated with a carbon/BN coating from a monocrystalline silicon carbide nanofiber; impregnating or stirring and dispersing the SiC nanofiber in an ethanol/water suspension containing nanometer carbon black/silicon carbide particles; and preparing a SiCNf preform by vacuum suction filtration or rolling: placing the above interfacial layer deposited nanofiber preform in a molding die, further carrying out press molding, carrying out high-temperature dumping to obtain a high-density SiCNf preform, and then performing reaction infiltration. Compared with in-situ grown SiC nanowire/fiber (SiCnf) reinforced SiC ceramic matrix composite materials, the composite material of the invention has the advantages of easiness in preparation of the interfacial coating of the SiCNf and the matrix, high volume content of the SiCNf, and high density.

Description

technical field [0001] The invention relates to a method for preparing a silicon carbide composite material, in particular to a method for preparing a single crystal silicon carbide nanofiber / silicon carbide ceramic matrix composite material by reaction sintering. Background technique [0002] The biggest disadvantage of ceramics is their high brittleness and poor thermal shock resistance, which limit their application in the field of thermal structural materials. Fiber / whisker reinforcements are usually introduced into ceramics to improve the toughness of ceramics. In particular, continuous SiC ceramic fiber reinforced and toughened SiC ceramic matrix composites (SiCf / SiC CMC) not only retains the advantages of SiC ceramics such as high temperature resistance, high strength, oxidation resistance, corrosion resistance, and impact resistance, but also SiCf / SiC ceramic matrix composites. It has low density, stable performance at high temperature, low tritium permeability and ...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/573C04B35/628C04B35/81
CPCC04B35/806C04B35/565C04B35/573C04B35/62868C04B35/62873C04B35/62894C04B2235/5244C04B2235/5264C04B2235/5276C04B2235/616C04B2235/96
Inventor 陈建军刘东旭侯红臣郑旭鹏
Owner ZHEJIANG SCI-TECH UNIV
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