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Boron nitride nanosheet-reinforced ceramic-based composite material and preparation method thereof

A composite material and nanosheet technology, which is applied in the field of boron nitride nanosheet reinforced ceramic matrix composites and its preparation, can solve the problems of boron nitride nanotubes that are difficult to synthesize in large quantities, hinder the effect of crack propagation, and poor high temperature stability. Achieve the effects of improving stress transfer efficiency, good product performance, and improving toughness

Active Publication Date: 2017-05-31
山东晶亿新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of existing technologies such as the poor high-temperature stability of carbon nanotubes and graphene-reinforced ceramic matrix composites, and the difficulty in large-scale synthesis of boron nitride nanotubes and the insignificant effect of hindering crack propagation when strengthening ceramic materials, the present invention provides A kind of boron nitride nanosheet reinforced ceramic matrix composite material and preparation method thereof

Method used

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  • Boron nitride nanosheet-reinforced ceramic-based composite material and preparation method thereof
  • Boron nitride nanosheet-reinforced ceramic-based composite material and preparation method thereof
  • Boron nitride nanosheet-reinforced ceramic-based composite material and preparation method thereof

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Embodiment 1

[0047] Fused silica-based composites were prepared by hot-pressing sintering with boron nitride nanosheets as the reinforcing phase.

[0048] 1) Step: Weigh 0.06g of boron nitride nanosheets and 11.94g of fused silica powder with a balance, put them into a glass container and add 1000mL of distilled water to the container, and then use high-speed stirring and ultrasonic treatment for 8 hours to obtain uniformly dispersed suspension;

[0049] 2) step; the pH value of the two suspensions is adjusted to pH=3 by using a dilute solution of hydrochloric acid (1M), and the boron nitride nanosheet suspension is added dropwise to the fused silica suspension, while adding Still carry out high-speed stirring on the fused silica suspension to fully mix the two;

[0050] 3) step; then seal the obtained mixed solution and let it settle for 24 hours, remove the supernatant by vacuum filtration, and obtain the mixed powder after drying for 24 hours;

[0051] 4) Step: put the mixed powder in...

Embodiment 2

[0054] Fused silica-based composites were prepared by hot-pressing sintering with boron nitride nanosheets as the reinforcing phase.

[0055] 1) Step: Weigh 0.12g of boron nitride nanosheets and 11.88g of fused silica powder with a balance, put them into glass containers respectively, add 800mL of distilled water to the container, and then use high-speed stirring and ultrasonic treatment for 10 hours to obtain uniformly dispersed suspension;

[0056] 2) step; the pH value of the two suspensions is adjusted to pH=3 by using a dilute solution of hydrochloric acid (1M), and the boron nitride nanosheet suspension is added dropwise to the fused silica suspension, while adding Still carry out high-speed stirring on the fused silica suspension to fully mix the two;

[0057] 3) step: seal the obtained mixed solution and let it settle for 24 hours, remove the supernatant by vacuum filtration, and obtain the mixed powder after drying for 24 hours;

[0058] 4) Step: put the mixed powde...

Embodiment 3

[0061] Fused silica-based composites were prepared by hot-pressing sintering with boron nitride nanosheets as the reinforcing phase.

[0062] 1) Step: Weigh 0.18g of boron nitride nanosheets and 11.82g of fused silica powder with a balance, put them into a glass container and add 700mL of distilled water to the container, and then use high-speed stirring and ultrasonic treatment for 8 hours to obtain uniformly dispersed suspension;

[0063] 2) step; then adopt dilute hydrochloric acid solution (2M) to adjust the pH value of the two suspensions to pH=3.5, and add the boron nitride nanosheet suspension dropwise to the fused silica suspension, At the same time, the fused silica suspension is still stirred at high speed to fully mix the two;

[0064] 3) step; then seal the obtained mixed solution and let it stand for precipitation for 40 hours, and remove the supernatant liquid by vacuum filtration, and obtain the mixed powder after drying for 34 hours;

[0065] 4) Step: put the...

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Abstract

The invention discloses a boron nitride nanosheet-reinforced ceramic-based composite material and a preparation method thereof. A boron nitride nanosheet is taken as a reinforced phase, and ceramic is taken as matrix. The method comprises the steps of firstly loading the boron nitride nanosheet and ceramic powder into a container separately, and obtaining evenly dispersed suspension liquids through high-speed mixing matched with ultrasonic treatment; adjusting the pH values of two suspension liquids to a certain range, dropwise adding the boron nitride nanosheet suspension liquid into the ceramic powder suspension liquid, and carrying out standing, precipitation, suction filtration and drying to obtain mixed powder; then, putting the mixed powder into a graphite jig, carrying out hot-pressed sintering in a multifunctional sintering furnace, carrying out heat preservation for a period of time and stopping heating; and naturally cooling to a room temperature in the furnace to obtain a finished product. The method has good effects that the preparation method is simple, the product performance is good, the cost is relatively low, massive production is easy to achieve, and the obtained boron nitride nanosheet-reinforced ceramic-based composite material has excellent mechanical properties and high-temperature stability.

Description

technical field [0001] The invention relates to a preparation method of an inorganic non-metallic material, in particular to a boron nitride nanosheet reinforced ceramic matrix composite material and a preparation method thereof. Background technique [0002] Ceramic materials are unique in the field of materials due to their excellent performance. Ceramic materials themselves have high strength and elastic modulus, but poor toughness seriously limits their applications. Therefore, the reinforcement and toughening of ceramic materials is the primary problem to be solved. Boron nitride nanosheets have good high temperature and chemical stability, high thermal conductivity, excellent dielectric properties and good mechanical properties, and have extremely high application potential in ceramic toughening. [0003] Common toughening methods for ceramic materials include: phase transformation toughening, whisker and particle toughening, fiber toughening, nanowire and nanotube tou...

Claims

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Application Information

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IPC IPC(8): C04B35/78C04B35/14C04B35/645
CPCC04B35/14C04B35/645C04B35/78C04B2235/386C04B2235/6562
Inventor 毕见强孙国勋王伟礼赵庆强郝旭霞高希成
Owner 山东晶亿新材料有限公司
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