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Silicon boron oxygen nitrogen fiber/silicon nitride ceramic composite material and preparation method thereof

A technology of silicon boron oxynitride fiber and silicon nitride ceramics, applied in the field of new materials, can solve the problems of reducing the mechanical properties of silicon nitride, and achieve easy industrial production, realize industrial production, low dielectric constant and dielectric loss. Effect

Inactive Publication Date: 2012-10-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned research and existing technologies have improved the dielectric properties of silicon nitride to some extent by combining boron nitride and silicon dioxide particles with silicon nitride, but it also inevitably reduces the mechanical properties of silicon nitride.

Method used

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  • Silicon boron oxygen nitrogen fiber/silicon nitride ceramic composite material and preparation method thereof
  • Silicon boron oxygen nitrogen fiber/silicon nitride ceramic composite material and preparation method thereof
  • Silicon boron oxygen nitrogen fiber/silicon nitride ceramic composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Combine 10wt.% silicon, boron, oxynitride fiber, 85wt.% silicon nitride, 5wt.% sintering aid yttrium oxide, and 0.6wt% additive polyvinyl alcohol (average degree of polymerization of 1750±50). ), add water ball mill and mix for 2h to obtain a uniformly mixed slurry. The solid content of the slurry is 60wt%;

[0046] 2. The slurry obtained in step 1 is dried, crushed, and sieved to obtain a mixed powder.

[0047] 3. Put the mixed powder obtained in step 2 into a rubber mold, and form it by isostatic pressure at a pressure of 160MPa.

[0048] 4. Dry the green body formed in step 3, and then put it into a pneumatic sintering furnace, hold it for 2 hours under the conditions of nitrogen atmosphere pressure of 6MPa and temperature of 1800℃, and then sinter it, and then naturally cool to room temperature with the furnace to obtain silicon, boron, oxygen, and nitrogen. Fiber / silicon nitride ceramic composite material. The SEM scan photo of the material section of the product is...

Embodiment 2

[0051] 1. Mix 10wt.% silicon boron oxynitride fiber, 82wt% silicon nitride and 8wt% sintering aid yttrium oxide, as well as 0.2wt% sodium silicate and 0.6wt% sodium carbonate based on the total weight of the raw materials, add water ball mill and mix for 2h, Obtain a uniformly mixed slurry with a solid content of 60wt%;

[0052] 2. The slurry prepared in step 1 is slowly poured into a gypsum mold to form, and then demolded and dried to obtain a green body.

[0053] 3. The green body obtained in step 2 is sintered under the conditions of nitrogen atmosphere pressure of 6MPa, sintering temperature of 1750℃, holding for 3 hours, and then natural cooling to room temperature with the furnace, and finally preparing silicon boron oxynitride fiber / nitriding fiber Silicon ceramic composite material.

Embodiment 3

[0055] 1. Combine 5wt.% silicon boron oxynitride fiber, 87wt.% silicon nitride, 8wt.% sintering aid yttrium aluminum garnet, and 0.8wt% additive polyvinyl alcohol (average degree of polymerization of 1750). ±50), add water and ball mill and mix for 2h to obtain a uniformly mixed slurry with a solid content of 65wt%;

[0056] 2. The slurry obtained in step 1 is dried, crushed, and sieved to obtain a mixed powder.

[0057] 3. Put the mixed powder obtained in step 2 into a rubber mold, and isostatically press it under a pressure of 160MPa.

[0058] 4. Dry the green body formed in step 3, and then put it into an air pressure sintering furnace, hold it for 3 hours under the conditions of a nitrogen atmosphere pressure of 8MPa and a temperature of 1850°C, and then sinter it, and then naturally cool to room temperature with the furnace to obtain silicon, boron, oxygen, and nitrogen. Fiber / silicon nitride ceramic composite material.

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Abstract

The invention relates to a silicon boron oxygen nitrogen fiber / silicon nitride ceramic composite material and a preparation method thereof. The silicon boron oxygen nitrogen fiber / silicon nitride ceramic composite material is prepared by carrying out mixing, molding and sintering on the raw materials, wherein the raw materials comprise, silicon nitride 80-90 wt.%, silicon boron oxygen nitrogen fiber 3-10 wt.% and a sintering aid 3-10 wt.%. The preparation method comprises the following steps: mixing the silicon nitride powder, the silicon boron oxygen nitrogen fiber and the sintering aid; adding a molding additive; carrying out ball milling to produce a ceramic slurry; adopting a slip casting or adopting an isostatic pressing technology after carrying out drying and pulverizing to the slurry; sintering and heat preserving the molded green body after being dried for 1-3 hours, wherein the sintering is carried out under atmosphere of nitrogen and at a temperature of 1700-1850 DEG C The produced silicon boron oxygen nitrogen fiber / silicon nitride ceramic composite material in the invention has the advantages of excellent mechanical properties, good dielectric properties, and good temperature resistance and ablation resistance. The composite material can be used for preparation of high performance radome. The method is simple and easy to carry out, and is suitable for batch production.

Description

Technical field [0001] The invention relates to a silicon, boron, oxygen, nitrogen fiber / silicon nitride ceramic composite material and a preparation method thereof, and belongs to the technical field of new materials. Background technique [0002] The radome is an important part of the structure of the guided weapon warhead. It is also a barrier that protects the antenna system from the harsh aerodynamic environment caused by high-speed flight. It is a multi-functional integration of wave penetration, heat resistance, load bearing and corrosion resistance. Therefore, the radome material must meet the requirements of dielectric properties, mechanical properties, three defenses, life, manufacturability and weight. For hypersonic missiles, the candidate materials for the radome are mainly silicon nitride-based ceramic composites. Silicon nitride (Si 3 N 4 Although ceramics have excellent mechanical properties, high thermal stability, low dielectric constant and dielectric loss, si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/80C04B35/622
Inventor 张玉军谭砂砾焦倩龚红宇赵玉军张炎李建权李其松
Owner SHANDONG UNIV