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Preparation of boron nitride nano tube enhanced alumina ceramic

A technology of boron nitride nanotubes and alumina ceramics, which is applied in the field of preparation of alumina ceramics, can solve the problems of phase change whiskers and particle toughening effects not particularly obvious, complicated operation engineering, and reduced toughening effects, etc., to achieve Low cost, simple operation and processing, and good product performance

Active Publication Date: 2011-08-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effect of phase transformation, whisker and particle toughening is not particularly obvious; the operation engineering of fiber toughening is more complicated, and the product density is poor; Its application has certain limitations, and at the same time, carbon nanotubes are easy to react with the matrix material at high temperature, thus reducing the toughening effect

Method used

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  • Preparation of boron nitride nano tube enhanced alumina ceramic
  • Preparation of boron nitride nano tube enhanced alumina ceramic
  • Preparation of boron nitride nano tube enhanced alumina ceramic

Examples

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Embodiment 1

[0024] Example 1: Alumina ceramics were prepared by hot pressing and sintering with boron nitride nanotubes as reinforcing phase and alumina as matrix. Weigh 0.0875g of boron nitride nanotubes, 34.9125g of alumina, and 245g of alumina ball milling balls into a planetary ball milling jar with a balance. 300r / min at room temperature, ball milling for 8 hours. Put the ball-milled mixed powder in a graphite mold with a diameter of 42mm, raise the temperature to 1500°C at 20°C / min in a multifunctional sintering furnace, pressurize 25Mpa for sintering, and stop heating after holding for 1 hour to make it in the furnace Cool naturally to room temperature. The sintered ceramic block is finished by grinding, cutting and other processes.

Embodiment 2

[0026] Alumina ceramics were prepared by hot pressing and sintering with boron nitride nanotubes as reinforcing phase and alumina as matrix. Weigh 0.875g of boron nitride nanotubes, 34.125g of alumina, and 245g of alumina ball milling balls into a planetary ball milling jar with a balance. 300r / min at room temperature, ball milling for 8 hours. Put the ball-milled mixed powder in a graphite mold with a diameter of 42mm, raise the temperature to 1500°C at 20°C / min in a multifunctional sintering furnace, pressurize 25Mpa for sintering, and stop heating after holding for 1 hour to make it in the furnace Cool naturally to room temperature. The sintered ceramic block is finished by grinding, cutting and other processes.

Embodiment 3

[0028] Alumina ceramics were prepared by hot pressing and sintering with boron nitride nanotubes as reinforcing phase and alumina as matrix. Weigh 1.75g ​​of boron nitride nanotubes, 34.25g of alumina, and 245g of alumina ball milling balls into a planetary ball milling jar with a balance. 300r / min at room temperature, ball milling for 8 hours. Put the ball-milled mixed powder in a graphite mold with a diameter of 42mm, raise the temperature to 1500°C at 20°C / min in a multifunctional sintering furnace, pressurize 25Mpa for sintering, and stop heating after holding for 1 hour to make it in the furnace Cool naturally to room temperature. The sintered ceramic block is finished by grinding, cutting and other processes.

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Abstract

The invention relates to a preparation method for alumina ceramics enhanced by a boron nitride nano pipe, which comprises the following steps: A. using a scale to weigh the boron nitride nano pipe, alumina, and an alumina grinding ball respectively according to requirements; B. respectively arranging the weighed materials into a planetary grinding jar to carry out grinding; C arranging the mixed powder after grinding into a black lead die and arranging the black lead die into a multifunctional welding furnace for sintering; D. carrying out temperature preservation to the black lead die into the multifunctional welding furnace for 1 hour plus / minus 10 minutes, then stopping heating, and naturally cooling to the room temperature; and E. obtaining a finished product from a sintered ceramic block by the techniques of grinding and cutting. A device used by the invention is simple and good in safety; the cost is low; the preparation technique is stable; the operation is simple; the production efficiency is high; the product performance is good; the bending intensity of the alumina ceramics enhanced by the boron nitride nano pipe achieves 486.92Mpa, which is improved by 53 percent than that of the pure alumina ceramics; and the fracture toughness property achieves 5.66MPa.m<1 / 2>, which is improved by 17 percent.

Description

technical field [0001] The invention relates to a method for preparing alumina ceramics, in particular to a method for preparing alumina ceramics reinforced with boron nitride nanotubes. Background technique [0002] At present, boron nitride nanotubes have high chemical stability and oxidation resistance, and also have a wide energy gap (about 5.5eV), and their electrical properties are not affected by diameter and chirality, so that they can be used at high temperature and high strength. Fibers, semiconductor materials, etc., especially in the strength and toughening of ceramic materials, have more possible practicability than carbon nanotubes. [0003] The toughening methods of ceramic materials include: phase change toughening, whisker and particle toughening, fiber toughening, nanowire and nanotube toughening, etc. However, the effect of phase transformation, whisker and particle toughening is not particularly obvious; the operation engineering of fiber toughening is m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 毕见强于果鑫白玉俊王伟礼朱慧灵韩福东郭丹孙玮兴张林王云
Owner SHANDONG UNIV