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Silicon nitride ceramics enhanced by boron nitride nanotube and preparation method thereof

A technology of boron nitride nanotubes and silicon nitride ceramics, applied in the field of silicon nitride ceramics and its preparation, can solve the problems of reducing the toughening effect and the like, and achieve the effects of low cost, simple operation and processing, and stable preparation process

Inactive Publication Date: 2009-10-28
LINSHUSNTIAN ABRASIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, silicon nitride ceramics also have the brittleness common to ceramic materials
At present, the toughening of carbon nanotubes, which is widely used in ceramic materials, has certain limitations in its application due to the high temperature oxidation of carbon nanotubes. 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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  • Silicon nitride ceramics enhanced by boron nitride nanotube and preparation method thereof
  • Silicon nitride ceramics enhanced by boron nitride nanotube and preparation method thereof
  • Silicon nitride ceramics enhanced by boron nitride nanotube and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] Example 1: Boron nitride nanotubes are used as reinforcing phase, silicon nitride is used as matrix, and aluminum oxide and yttrium oxide are used as sintering aids to prepare silicon nitride ceramics by hot pressing and sintering. Weigh 0.0875g of boron nitride nanotubes, 31.4125g of silicon nitride and 3.5g of sintering aids (including 2.1g of alumina and 1.4g of yttrium oxide) with a balance, and put 245g of agate balls into a planetary ball mill jar. At room temperature, the rotation speed of the planetary ball mill jar was 300r / min, and the ball mill was performed for 10 hours. Put the ball-milled mixed powder into a graphite mold with a diameter of 42mm, heat up to 1750°C at a rate of 20°C / min in a multifunctional sintering furnace, pressurize at 25Mpa for sintering, and stop heating after 45 minutes of heat preservation to make it sinter in the furnace Cool naturally to room temperature. The sintered ceramic block is finished by grinding, cutting and other proce...

Embodiment 2

[0025] Example 2: Boron nitride nanotubes are used as reinforcing phase, silicon nitride is used as matrix, and aluminum oxide and yttrium oxide are used as sintering aids to prepare silicon nitride ceramics by hot pressing and sintering. Weigh 0.7g of boron nitride nanotubes, 30.8g of silicon nitride and 3.5g of sintering aids (including 2.1g of alumina and 1.4g of yttrium oxide) with a balance, and put 245g of agate balls into a planetary ball mill jar. At room temperature, the rotational speed of the planetary ball mill jar was 290r / min, and the ball milled for 9 hours. Put the ball-milled mixed powder into a graphite mold with a diameter of 42mm, heat up to 1740°C at a rate of 19°C / min in a multifunctional sintering furnace, pressurize at 24Mpa for sintering, and stop heating after holding for 40 minutes 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

[0026] Example 3: Boron nitride nanotubes are used as reinforcing phase, silicon nitride is used as matrix, and aluminum oxide and yttrium oxide are used as sintering aids to prepare silicon nitride ceramics by hot pressing and sintering. Weigh 1.75g ​​of boron nitride nanotubes, 29.75g of silicon nitride and 3.5g of sintering aids (including 2.1g of alumina and 1.4g of yttrium oxide) with a balance, and put 245g of agate balls into a planetary ball mill jar. At room temperature, the rotation speed of the planetary ball mill jar was 310r / min, and the ball mill was performed for 11 hours. Put the ball-milled mixed powder into a graphite mold with a diameter of 42mm, heat up to 1760°C at a rate of 21°C / min in a multifunctional sintering furnace, pressurize at 26Mpa for sintering, and stop heating after holding for 50 minutes. 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 silicon nitride ceramics enhanced by a boron nitride nanotube, which consists of the following components in portion by mass: 0.25 to 5 portions of the boron nitride nanotube, 89.75 to 85 portions of silicon nitride, 10 portions of a sintering assistant and 700 portions of agate milling ball, wherein the mass ratio of mixed powder consisting of the boron nitride nanotube, the silicon nitride and the sintering assistant to the agate milling ball is 1 to 7 all along. The invention simultaneously discloses a preparation process for the silicon nitride ceramics, which comprises the following steps: A, weighing the components according to the requirements; B, ball-milling the weighed materials; C, putting the ball-milled mixed powder into a graphite die, and putting the graphite die into a multi-functional sintering furnace for sintering; D, preserving heat, and then naturally cooling the graphite die to room temperature; and E, preparing a finished product. The bending strength of the product prepared by the process reaches 773.1 MPa, and is 2.1 times of the bending strength of the pure silicon nitride ceramics; and the fracture toughness reaches 11.37 MPa.m, and is improved by 46 percent compared with the pure silicon nitride ceramics.

Description

technical field [0001] The invention relates to a silicon nitride ceramic and a preparation method thereof, in particular to a boron nitride nanotube-reinforced silicon nitride ceramic and a preparation method thereof. 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] Silicon nitride ceramics have good thermal shock resistance, electrical insulation and excellent chemical stability. As a structural ceramic, silicon nitride ceramics are widely used in heat-resistant, corrosion-resistant, and wear-resistant parts, and are also widely used in thermal engine ...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622
Inventor 毕见强王伟礼白玉俊朱慧灵郭丹孙玮兴张林
Owner LINSHUSNTIAN ABRASIVE
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