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Preparation process of honeycomb fiber interlayer modern ceramic

A preparation process, honeycomb-shaped technology, applied in the field of preparation of modern ceramics between honeycomb fiber layers, can solve the problems of large-scale production difficulties, high cost of nano-toughening, and ineffective particle toughening effect, etc., to improve the brittle nature , Excellent antioxidant properties

Pending Publication Date: 2022-06-21
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the effect of particle toughening is not obvious, the cost of nano toughening is high, and large-scale production is difficult, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation process of modern ceramics between honeycomb fiber layers, comprising the following steps:

[0031] (1) Nano Al 2 O 3 The powder (particle size is 80-200nm) is added to the PVA aqueous solution with a mass concentration of 2% and stirred to form Al. 2 O 3 slurry, the solid content of the slurry is 50%. Then the Al 2 O 3 Slurry extrudes Al with a diameter of 800 μm by extrusion 2 O 3 Fibroblasts, dried in a cool place for 24 hours before use.

[0032] (2) Micron Al 2 O 3 The powder (particle size of 1-3 μm) is dispersed in water, and PVA is added as a binder, and stirred evenly to obtain an interface separation layer slurry with a solid content of 30%, wherein the micron Al 2 O 3 The mass ratio of powder to PVA is 99:1.

[0033] (3) drying the Al 2 O 3 The fibrous cell body is immersed in the slurry of the interface separation layer in step (2), and after being taken out, a layer of Al of the slurry of the interface separation layer is attache...

Embodiment 2

[0036] A preparation process of modern ceramics between honeycomb fiber layers, comprising the following steps:

[0037] (1) Add nano-SiC powder (particle size 80-200 nm) into a PVA aqueous solution with a mass concentration of 2% and stir to form a SiC slurry, and the solid content of the slurry is 50%. Then, the SiC slurry was extruded into a SiC fiber cell body with a diameter of 100 μm by extrusion, and dried in a cool place for 30 hours before use.

[0038](2) Disperse the micron SiC powder (particle size 1-3 μm) in water, add PVA as a binder, and stir evenly to obtain an interface separation layer slurry with a solid content of 20%, wherein the micron SiC powder and The mass ratio of PVA is 97:3.

[0039] (3) Immerse the air-dried SiC fiber cell body in the interface separator slurry of step (2), and after taking out the SiC fiber cell body with a layer of interface separator slurry attached to the surface, dry it at 90° C. for 2 hours , to obtain a ceramic body.

[0...

Embodiment 3

[0042] A preparation process of modern ceramics between honeycomb fiber layers, comprising the following steps:

[0043] (1) The nano-Si 3 N 4 The powder (particle size is 80-200nm) is added to the PVA aqueous solution with a mass concentration of 1% and stirred evenly to form Si 3 N 4 Slurry, the solid content of the slurry is 40%. Then the Si 3 N 4 The slurry is extruded from Si with a diameter of 300 μm by extrusion 3 N 4 Fibroblasts, dry in a cool place for 36 hours before use.

[0044] (2) Micro-Si 3 N 4 The powder (particle size of 1-3 μm) is dispersed in water, and PVA is added as a binder, and stirred evenly to obtain an interface separation layer slurry with a solid content of 35%, wherein the micron Si 3 N 4 The mass ratio of powder to PVA is 95:5.

[0045] (3) drying the Si 3 N 4 The fibrous cell body is immersed in the interface separation layer slurry of step (2), and after being taken out, a layer of Si with the interface separation layer slurry is ...

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Abstract

The invention discloses a preparation process of honeycomb fiber interlayer modern ceramic, which comprises the following steps: (1) preparing fine-grain ceramic powder and an adhesive into ceramic slurry, preparing the ceramic slurry into hexagonal-prism-shaped solid ceramic fiber cell bodies, and airing for later use; (2) coarse-grain ceramic powder and an adhesive are prepared into interface separation layer slurry, the components of the coarse-grain ceramic powder are consistent with those of the fine-grain ceramic powder, but the size of the coarse-grain ceramic powder is larger than that of the fine-grain ceramic powder; and adhering an interface separation layer on the surface of the ceramic fiber cell body, and drying to obtain a ceramic body. And (3) arranging the ceramic green bodies to form a honeycomb structure, then carrying out pressure forming and pressure maintaining, and thus obtaining the green body of the self-toughening fiber monolith modern ceramic. And (4) degumming the green body obtained in the step (3), and calcining to obtain the modern ceramic. According to the ceramic disclosed by the invention, cracks are repeatedly deflected in different structural layers by utilizing the interaction of different structural units, so that a large amount of fracture energy is consumed, and the fracture toughness of the ceramic is increased by geometric multiples.

Description

technical field [0001] The invention relates to the technical field of preparation of modern ceramics, in particular to a preparation process of modern ceramics between honeycomb fiber layers. Background technique [0002] Modern ceramics have broad application prospects in the fields of aerospace, defense and military, automobiles and mechanical equipment due to their excellent properties such as corrosion resistance, high temperature resistance, wear resistance, and low density. However, the characteristics of high brittleness and low toughness of ceramics lead to poor reliability and damage resistance, which limits their further applications. Continuously improving the toughness of ceramics has become one of the core issues to break through the bottleneck of modern ceramic applications. [0003] At present, the commonly used ceramic toughening methods include phase transformation toughening, whisker / fiber toughening, micro-crack toughening, self-toughening, particle toug...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/80C04B35/10C04B35/48C04B35/563C04B35/565C04B35/58C04B35/584C04B35/622C04B35/64
CPCC04B38/0016C04B35/80C04B35/563C04B35/10C04B35/565C04B35/58071C04B35/584C04B35/48C04B35/622C04B35/64C04B2235/96C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/5236C04B2235/524C04B2235/5244C04B2235/5224C04B2235/666
Inventor 唐修检刘谦谭俊王帆吴志远杜军王龙杨理钧孟凡卓
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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