A kind of prestressed fiber reinforced c/sibcn ceramic composite material and preparation method thereof

A ceramic composite material and composite material technology are applied in the field of prestressed fiber reinforced C/SiBCN ceramic composite materials and their preparation, which can solve the influence of preform volume and internal expansion stress, surface cracks of large composite materials, and low melting point of metals. requirements, etc., to solve the premature cracking of the matrix, improve the mechanical performance, and avoid the effect of interlayer damage

Active Publication Date: 2022-05-27
SHANGHAI UNIV +1
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Problems solved by technology

However, in the process of preparing C / SiBCN ceramic composites by PIP process, the number of impregnation pyrolysis often has a great impact on the volume and internal expansion stress of the preform, which eventually leads to the large composite material There are obvious cracks and cracks on the surface
The traditional solution is often to achieve the role of a diffusion barrier by introducing an interface layer to protect the fiber from chemical damage: for example, the introduction of pyrolytic carbon (PyC) interfacial thermal oxidation improves the fracture behavior, but this will affect the absorbing properties of the material ; or use the metal cladding method, using the characteristics of the metal linear expansion coefficient > ceramics and good toughness and tensile strength to apply prestress to the ceramic matrix composite material, but as the main application object of the wave-absorbing coating at high temperature, the melting point of the metal is low The characteristics cannot meet the requirements of use at high temperature

Method used

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  • A kind of prestressed fiber reinforced c/sibcn ceramic composite material and preparation method thereof
  • A kind of prestressed fiber reinforced c/sibcn ceramic composite material and preparation method thereof
  • A kind of prestressed fiber reinforced c/sibcn ceramic composite material and preparation method thereof

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preparation example Construction

[0031] The invention provides a preparation method of a prestressed fiber reinforced C / SiBCN ceramic composite material, comprising the following steps:

[0032] The carbon fiber preform is pressurized and immersed in the polysilaborazane precursor to obtain a green embryo;

[0033] The green embryo is cross-linked and solidified to obtain a solidified body;

[0034] The solidified body is pyrolyzed to obtain a SiBCN ceramic matrix;

[0035] repeating the process of pressure impregnation-cross-linking curing-pyrolysis for the SiBCN ceramic substrate in sequence 2-3 times to obtain a C / SiBCN composite material;

[0036] Grinding and drilling the C / SiBCN composite material from the upper surface to the lower surface to form through holes;

[0037] The carbon fiber bundles coated with epoxy resin are introduced into the through holes, the two ends of the obtained composite are fixed with anchor points, and a Z-direction stress is applied to one end of the anchor points, and the...

Embodiment 1

[0068] The 2.5D carbon fiber preform (woven from T300-1K, with a porosity of 60%, a fiber diameter of 5 μm, a cylindrical shape, a bottom diameter of 75 mm and a height of 100 mm) is cut to a length of 100 mm × width 53 mm × height 53 mm The size of the reactor is placed in a pressure reactor, the air in the reactor is evacuated by an external vacuum pump, and PBSZ immersion solution is added to the reactor until it is completely immersed, using N 2 Pressurized impregnation in an atmosphere, the applied pressure is 1 MPa, and the dipping time is 4 h to obtain green embryos; the temperature in the pressure reaction kettle is raised to 170 ° C (the pressure of the whole system is still maintained at 1 MPa), and cross-linking and curing are carried out. The time is 2h, the heating device is turned off, and the reaction kettle is cooled to room temperature; the sample is taken out from the kettle, transferred to a high-temperature tube furnace, 2Under protective atmosphere conditi...

Embodiment 2

[0072] The three-dimensional (3D) carbon fiber preform (made from T300-1K, the volume fraction of carbon fiber is 32%, and the fiber diameter is 6μm) is cut to a size of 100mm × width 53mm × height 53mm and placed in a pressure reaction kettle. External vacuum pump Dry the air in the kettle, add PBSZ immersion solution to the reactor until it is completely immersed, and use N 2 Pressurized impregnation in an atmosphere, the applied pressure is 1 MPa, and the dipping time is 4 h to obtain green embryos; the temperature in the pressure reaction kettle is raised to 170 ° C (the pressure of the whole system is still maintained at 1 MPa), cross-linking and curing are carried out, and curing is carried out. The time is 2h, the heating device is turned off, and the reaction kettle is cooled to room temperature; 2 Under protective atmosphere conditions, pyrolysis was carried out at 1000 °C for 2 h, and the process of pressure impregnation-crosslinking curing and pyrolysis (PIP) was re...

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Abstract

The invention provides a prestressed fiber reinforced C / SiBCN ceramic composite material and a preparation method thereof, belonging to the technical field of ceramic matrix composite materials. The invention improves the interlayers of the fiber preform in the process of repeating the PIP, introduces Z-direction prestressed fibers along the direction perpendicular to the interlayer of the fiber preform, and introduces the Z-direction prestressed fibers into the SiBCN ceramic matrix by grinding and drilling holes. The prestressed fibers perpendicular to the axial direction can offset the internal stress from the inside to the outside of the composite material during the process of PIP impregnation and pyrolysis to prepare thicker samples, improve the mechanical properties of structural ceramics, and avoid excessive fiber pull-out and layering. Moreover, the Z-direction fibers can enhance the mechanical properties of the material along the axial direction, which not only reduces the internal stress of the composite material, but also improves the bonding state of the matrix and the reinforcement fibers, which solves the problem of continuous carbon fiber reinforced SiBCN ceramic matrix. The problem of premature cracking between the layers of the composite matrix.

Description

technical field [0001] The invention relates to the technical field of ceramic matrix composite materials, in particular to a prestressed fiber reinforced C / SiBCN ceramic composite material and a preparation method thereof. Background technique [0002] Carbon fiber reinforced silicon boron carbon nitride matrix composite material (C / SiBCN composite material) is based on carbon fiber or carbon fiber fabric such as carbon cloth, carbon felt, etc. The pyrolysis process is to immerse the fiber preform in the polymer precursor solution, crosslink and solidify the dipped preform under specific conditions, and finally convert it into an inorganic ceramic matrix during the ceramic transformation process of high temperature pyrolysis. , through multiple cycles of impregnation and pyrolysis, a relatively dense ceramic matrix composite material is finally obtained by processing a light-weight and high-strength wave-absorbing composite material. [0003] C / SiBCN ceramic matrix composi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/84C04B35/58C04B35/56
CPCC04B35/80C04B35/5805C04B35/58C04B35/56C04B2235/5248C04B2235/486C04B2235/483C04B2235/77C04B2235/96
Inventor 李志伟康治伟李爱军彭雨晴宁立新贾林涛王梦千李照谦
Owner SHANGHAI UNIV
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