Wave-absorbing ceramic-based composite material with multi-scale toughening and layering structure and preparation method thereof
A composite material and multi-scale technology, applied in the field of materials, can solve problems such as uneven distribution of one-dimensional nanomaterials and affect the uniformity of material properties, so as to avoid uneven distribution inside and outside, improve mechanical properties and bearing capacity, and increase wetting sexual effect
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[0028] A method for preparing a multi-scale toughened layered structure microwave-absorbing ceramic matrix composite material, the specific steps are:
[0029] Step 1: Prepare a BN / SiC composite interface layer on the fiber surface inside the single-layer fiber cloth layer, the thickness of the BN interface layer is 300-1500 nm, and the thickness of the SiC interface layer is 200-1000 nm. The reinforcing fiber used in the single-layer fiber cloth layer is silicon carbide fiber, and the weaving structure of the fiber cloth is plain weave, twill weave or satin weave. The preparation method of the BN / SiC composite interface layer is specifically: placing multiple single-layer fiber cloth layers in a CVI deposition furnace, first using BCl 3 -NH 3 -Ar-H2 precursor gas system to prepare BN interface layer on the fiber surface of single-layer fiber cloth layer, BCl 3 -NH 3 -Ar-H 2 BCl in precursor gas system 3 with NH 3 The flow ratio is 1:3 to 1:5; then the SiC layer is prepa...
Embodiment 1
[0034] Step 1: Prepare a BN / SiC composite interface layer on the fiber surface inside the single-layer silicon carbide fiber cloth layer to obtain a primary fiber cloth; the single-layer fiber cloth weaving structure is a plain weave structure, the thickness of the BN interface layer is 300nm, and the SiC interface layer The thickness is 500nm. BN interface adopts BCl 3 -NH 3 -Ar-H 2 The system is prepared on the fiber surface, BCl 3 -NH 3 -Ar-H 2 BCl in precursor gas system 3 with NH 3 The flow ratio is 1:3, and the SiC interface adopts MTS-Ar-H 2 The system is prepared on the surface of BN layer, MTS-Ar-H 2 MTS and (Ar+H 2 ) The gas flow ratio is 1:10.
[0035] Step 2: Introduce a catalyst into the primary fiber cloth prepared in step 1, and grow a one-dimensional nano-toughened phase on the surface of the BN / SiC composite interface layer in situ by chemical vapor deposition to obtain a secondary fiber cloth. The catalyst used is Co(NO 3 ) 2 ·6H 2 O, arrange th...
Embodiment 2
[0040] Step 1: Prepare a BN / SiC composite interface layer on the fiber surface inside the single-layer silicon carbide fiber cloth layer to obtain a primary fiber cloth; the weaving structure of the single-layer fiber cloth is a twill structure, the thickness of the BN interface layer is 1500nm, and the SiC interface layer The thickness is 500nm. BN interface adopts BCl 3 -NH 3 -Ar-H 2 The system is prepared on the fiber surface, BCl 3 -NH 3 -Ar-H 2 BCl in precursor gas system 3 with NH 3 The flow ratio is 1:3, and the SiC interface adopts MTS-Ar-H 2 The system is prepared on the surface of BN layer, MTS-Ar-H 2 MTS and (Ar+H 2 ) The gas flow ratio is 1:20.
[0041] Step 2: Introduce a catalyst into the primary fiber cloth prepared in step 1, and grow a one-dimensional nano-toughened phase on the surface of the BN / SiC composite interface layer in situ by chemical vapor deposition to obtain a secondary fiber cloth. The catalyst used is Ni(NO 3 ) 2 ·6H 2 O, arrange ...
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