Porous silicon nitride ceramic material and preparation method thereof

A technology of silicon nitride ceramics and silicon nitride powder, applied in the field of ceramic materials, can solve the problem of low porosity of porous ceramics

Active Publication Date: 2018-11-27
YANSHAN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

Usually the Si obtained by the above method 3 N 4 The porosity of porous ceramics is still low, and the fracture toughness is generally lower than 7MPa m 1 / 2

Method used

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  • Porous silicon nitride ceramic material and preparation method thereof
  • Porous silicon nitride ceramic material and preparation method thereof
  • Porous silicon nitride ceramic material and preparation method thereof

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[0023] The invention provides a method for preparing a porous silicon nitride ceramic material, comprising the following steps:

[0024] Mixing amorphous silicon nitride powder and sintering aids and then sintering to obtain a sintered material; the sintering aids include alumina and yttrium oxide;

[0025] The sintered material is heat-treated to obtain a porous silicon nitride ceramic material.

[0026] In the invention, the amorphous silicon nitride powder and the sintering aid are mixed and then sintered to obtain a sintered material. In the present invention, the amorphous silicon nitride powder is preferably amorphous nano-silicon nitride powder, and the average particle diameter of the amorphous silicon nitride powder is preferably 15-20 nm, more preferably 18 nm.

[0027] In the present invention, the sintering aid includes alumina and yttrium oxide; the sintering aid is preferably a powder material, and the average grain diameter of the sintering aid is preferably 18...

Embodiment 1

[0041]amorphous nano-Si 3 N 4 Powder and Al 2 o 3 , Y 2 o 3 Sintering aid powder for mixing; amorphous nano-Si 3 N 4 The average grain diameter of the powder is about 18nm, Al 2 o 3 , Y 2 o 3 The average grain diameter of the sintering aid powder is about 20nm, and the mass percentage is: 90% Si 3 N 4 ;5% Al 2 o 3 ;5%Y 2 o 3 .

[0042] Put the mixed powder into a ball mill and mill for 1 hour to ensure that the powder is mixed evenly; then put the powder into a graphite mold and put it into a hot-press sintering furnace for hot-press sintering; load it to 30MPa, vacuumize, and fill with nitrogen for protection , the nitrogen pressure is 0.1MPa; the temperature is raised to 1600°C, the heating rate is 30°C / min, and the holding time is 30min; the temperature is lowered with the furnace to obtain the sintered material;

[0043] Heat the sintered material obtained by hot-pressing sintering to 1900°C, and carry out heat treatment under vacuum conditions without mec...

Embodiment 2

[0047] amorphous nano-Si 3 N 4 Powder and Al 2 o 3 , Y 2 o 3 Sintering aid powder for mixing; amorphous nano-Si 3 N 4 The average grain diameter of the powder is about 18nm, Al 2 o 3 , Y 2 o 3 The average grain diameter of the sintering aid powder is about 20nm, and the mass percentage is: 90% Si 3 N 4 ;5% Al 2 o 3 ;5%Y 2 o 3 .

[0048] Put the mixed powder into a ball mill and mill for 1 hour to ensure that the powder is mixed evenly; then put the powder into a graphite mold and put it into a hot-press sintering furnace for hot-press sintering; load it to 30MPa, vacuumize, and fill with nitrogen for protection , the nitrogen pressure is 0.1MPa; the temperature is raised to 1700°C, the heating rate is 30°C / min, and the holding time is 30min; the temperature is lowered with the furnace to obtain the sintered material;

[0049] Heat the sintered material obtained by hot-pressing sintering to 1900°C, and carry out heat treatment under vacuum conditions without me...

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Abstract

The invention provides a preparation method of a porous silicon nitride ceramic material. The preparation method of the porous silicon nitride ceramic material comprises the following steps: mixing amorphous silicon nitride powder with a sintering aid and sintering the mixture to obtain a sintered material, wherein the sintering aid comprises aluminium oxide and yttrium oxide; and carrying out heat treatment on the sintered material to obtain the porous silicon nitride ceramic material. The amorphous silicon nitride powder is used as a raw material, a large number of oxygen atoms are adsorbedto the surface of the amorphous silicon nitride powder, after sintering, the obtained sintered material has two phases including beta-Si3N4 and Si2N2O, in a heat treatment process, Si2N2O is decomposed to generate silicon nitride SiO and O2, by volatilization of SiO and O2, a porous structure is formed, and thus, the porous silicon nitride ceramic material is obtained; and moreover, in the heat treatment process, interlocked needle-shaped Si3N4 crystalline grains are formed, and by the special crystalline grain structure and air holes formed by heat treatment, the breaking tenacity of porous silicon nitride ceramic is greatly improved.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a porous silicon nitride ceramic material and a preparation method thereof. Background technique [0002] Silicon nitride ceramic material is a kind of artificial synthetic material, which has excellent comprehensive properties such as high hardness, high strength, high temperature resistance, oxidation resistance, wear resistance and thermal shock resistance, and is widely used in the field of high temperature resistant engineering. Porous ceramic materials are a type of porous ceramics formed by controlling the pore size and distribution during the molding and sintering process of the material. Due to the high porosity of porous ceramics, its density is much lower than that of dense ceramics of the same material, so it has the characteristics of light weight. . Silicon nitride-based porous ceramics is a new type of ceramic material gradually developed on the basis of...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/584C04B35/622C04B35/645
CPCC04B35/584C04B35/622C04B35/645C04B38/0025C04B2235/3418C04B2235/96C04B38/0074C04B38/0054
Inventor 骆俊廷郗晨阳张丽丽顾勇飞张春祥
Owner YANSHAN UNIV
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