A kind of preparation method of nano silicon nitride fiber/epoxy resin composite material

A nano-silicon nitride and epoxy resin technology is applied in the field of polymer composite materials, which can solve the problems of lack of nano-epoxy composite materials and difficulty in forming a thermally conductive network.

Active Publication Date: 2020-10-27
咸阳瞪羚谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is still a lack of a simple, fast and effective method for preparing nano-epoxy composites with high fiber content and uniform dispersion, and it is difficult for the fibers to form an effective heat-conducting network in the epoxy resin matrix

Method used

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  • A kind of preparation method of nano silicon nitride fiber/epoxy resin composite material

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Experimental program
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Effect test

Embodiment 1

[0024] 1) Preparation of porous nano-silicon nitride fiber frame: 20wt% carbon nanotubes, 70wt% 0.2 μm α-Si 3 N 4 , and 10wt% Y 2 o 3 The mixed powder is molded to form a green body, and the molding pressure is 20 MPa; the SiO powder is placed at the bottom of the crucible, wherein the mass ratio of SiO and carbon nanotubes is 10:1, and the green body is placed on the porous BN support in the middle of the crucible, and then Put the crucible in a multifunctional sintering furnace, feed nitrogen, and keep it at 1500°C for 6 hours. The temperature rise rate from room temperature to 1100°C is 500°C / h, and the temperature rise rate from 1100°C to 1500°C is 100°C / h. h, carry out carbothermal reduction and nitriding reaction to form a porous silicon nitride green body, in which the mass ratio of SiO and carbon nanotubes is 10:1; continue to heat up to 1750 ° C for liquid phase sintering, keep warm for 0.5 hours, and the heating rate is 100 ° C / h, a phase transition occurs during...

Embodiment 2

[0027] 1) Preparation of porous nano-silicon nitride fiber framework: 50wt% carbon nanotubes, 30wt% 0.5 μm α-Si 3 N 4 , and 20wt% Yb 2 o 3 The mixed powder is molded to form a green body, and the molding pressure is 40MPa; the SiO powder is placed at the bottom of the crucible, wherein the mass ratio of SiO and carbon nanotubes is 8:1, and the green body is placed on the porous BN support in the middle of the crucible, and then Put the crucible in a multi-functional sintering furnace, feed nitrogen, and keep warm at 1600°C for 3 hours. The temperature rise rate from room temperature to 1100°C is 700°C / h, and the temperature rise rate from 1100°C to 1600°C is 300°C / h. h, carry out carbothermal reduction and nitriding reaction to form a porous silicon nitride green body, in which the mass ratio of SiO and carbon nanotubes is 10:1; continue to heat up to 1850 ° C for liquid phase sintering, the heating rate is 100 ° C / h, keep warm After 2 hours, a phase transition occurred d...

Embodiment 3

[0030]1) Preparation of porous nano-silicon nitride fiber framework: 90wt% carbon nanotubes, 10wt% La 2 o 3 After the mixed powder is molded to form a green body, the molding pressure is 80 MPa; the SiO powder is placed at the bottom of the crucible, wherein the mass ratio of SiO and carbon nanotubes is 12:1, and the green body is placed on the porous BN support in the middle of the crucible, and then Put the crucible in a multi-functional sintering furnace, blow in nitrogen, and keep warm at 1700°C for 1 hour. The temperature rise rate from room temperature to 1100°C is 600°C / h, and the temperature rise rate from 1100°C to 1700°C is 200°C / h. h, carry out carbothermal reduction and nitriding reaction to form a porous silicon nitride body, in which the mass ratio of SiO and carbon nanotubes is 10:1; continue to heat up to 1800 ° C for liquid phase sintering, the heating rate is 200 ° C / h, heat preservation In 2 hours, a phase transition occurred during this process, that is,...

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Abstract

The invention discloses a preparation method of a nano silicon nitride fiber / epoxy resin composite material. The nano silicon nitride fiber / epoxy resin composite material is prepared by impregnating amixed material of epoxy resin, an epoxy resin curing agent and an accelerant into a porous nano silicon nitride fiber frame and performing high-temperature curing, wherein a volume fraction of nano silicon nitride fibers in the nano silicon nitride fiber / epoxy resin composite material is 20 vol%-60 vol%. According to the preparation method provided by the invention, The nano silicon nitride fibers in the epoxy resin composite material prepared by the preparation method has a continuous phase, and the high and low temperature mechanical properties, thermal conductivity, high-temperature creepresistance and fracture toughness of the composite material can be greatly improved; and in addition, the method has a simple preparation process, is easy to operate, and can change a content of the nano silicon nitride fibers in the composite material by adjusting and controlling porosity of a porous nano silicon nitride material.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a preparation method of nano silicon nitride fiber / epoxy resin composite materials. Background technique [0002] Polymer-based nanocomposites have attracted great attention from academia and industry. Only a small amount of nano-inorganic fillers can improve many physical and mechanical properties of polymer-based nanocomposites. High thermal conductivity nano-epoxy resin composite materials are multi-phase system composite materials with polymer as the matrix, nano-inorganic materials as fillers, and some with fiber reinforcement. It is widely used in chemical heat exchange and corrosion resistance occasions, which requires composite materials to have high thermal conductivity, withstand certain temperature and pressure, and good mechanical properties and corrosion resistance. [0003] Compared with granular inorganic particles, fiber or whisker-like inor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08K9/06C08K7/26C08J5/06
CPCC08J5/06C08J2363/00C08K7/26C08K9/06C08K2201/011
Inventor 王波李紫璇智强丁克张建飞周小楠黄鑫侯宝强杨建锋
Owner 咸阳瞪羚谷新材料科技有限公司
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