A kind of ultra-fine-grain sialon-based ceramic material with high temperature plasticity and preparation method thereof

A technology of ceramic materials and high temperature plasticity, applied in the field of ceramic materials, can solve the problems of difficult to process ceramic parts, poor high temperature plasticity, high processing cost, and achieve the effect of accelerating the densification process, promoting liquid phase sintering, and reducing the sintering temperature

Active Publication Date: 2021-06-25
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, Sialon ceramic materials are generally hard and brittle, and their high-temperature plasticity is poor, which makes them have problems such as high processing cost, difficult processing, and low reliability. It is difficult to process ceramic parts with complex shapes, which seriously hinders the practical application of ceramic materials.

Method used

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  • A kind of ultra-fine-grain sialon-based ceramic material with high temperature plasticity and preparation method thereof
  • A kind of ultra-fine-grain sialon-based ceramic material with high temperature plasticity and preparation method thereof
  • A kind of ultra-fine-grain sialon-based ceramic material with high temperature plasticity and preparation method thereof

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Experimental program
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preparation example Construction

[0027] The invention provides a method for preparing a Sialon-based ceramic material with high temperature plasticity, comprising the following steps:

[0028] S1, the amorphous nano-Si 3 N 4 Powder, nano-AlN powder and composite sintering aid are mixed to obtain mixed powder;

[0029] S2, performing spark plasma sintering on the mixed powder obtained in step S1 to obtain an ultrafine-grained Sialon-based ceramic material;

[0030] The composite sintering aid includes GH4169 superalloy powder, Y 2 o 3 Powder and Al 2 o 3 pink.

[0031] Unless otherwise specified, the raw materials used in the present invention are all commercially available.

[0032] In the present invention, amorphous nano-Si 3 N 4 Powder, nanometer AlN powder and composite sintering aid are mixed to obtain mixed powder. In the present invention, the composite sintering aid includes GH4169 superalloy powder, Y 2 o 3 Powder and Al 2 o 3 pink. In the present invention, in the mixed powder, amorph...

Embodiment 1

[0043] Amorphous nano-Si with a particle size of 20-25nm 3 N 4 powder, nano-AlN powder with a particle size of 38-42nm, and Y powder with a particle size of 18-22nm 2 o 3 Powder, Al with a particle size of 18-22nm 2 o 3 Powder and GH4169 superalloy powder with a particle size of 45-85 μm were mixed according to the mass ratio of 47:3:4:6:40, ball milled at 200 rpm for 2 hours, the ball milling medium was absolute ethanol, and the ball-to-material ratio was 1:6. After drying, a mixed ceramic powder is obtained.

[0044] Under the protection of argon atmosphere, the mixed ceramic powder was sintered by spark plasma sintering process. The sintering temperature was 1250°C, the heating rate was 50°C / min, the sintering holding time was 45min, and the sintering pressure was 30MPa. Sialon based ceramic material.

[0045] The density of the obtained Sialon-based ceramic material can reach 97%, and the main phase composition is O'-Sialon phase, and its microstructure and morpholog...

Embodiment 2

[0048] Amorphous nano-Si with a particle size of 20-25nm 3 N 4 powder, nano-AlN powder with a particle size of 38-42nm, and Y powder with a particle size of 18-22nm 2 o 3 Powder, Al with a particle size of 18-22nm 2 o 3 Powder and GH4169 superalloy powder with a particle size of 45-85 μm were mixed according to the mass ratio of 47:3:4:6:40, ball milled at 200 rpm for 2 hours, the ball milling medium was absolute ethanol, and the ball-to-material ratio was 1:6. After drying, a mixed ceramic powder is obtained.

[0049] Under the protection of argon atmosphere, the mixed ceramic powder was sintered by spark plasma sintering process. The sintering temperature was 1250°C, the heating rate was 50°C / min, the sintering holding time was 60min, and the sintering pressure was 30MPa. Sialon based ceramic material.

[0050] The density of the obtained Sialon-based ceramic material can reach 98.5%, and the main phase composition is O'-Sialon phase, and its microstructure and morphol...

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Abstract

The invention provides an ultrafine-grained Sialon-based ceramic material with high-temperature plasticity and a preparation method thereof, belonging to the technical field of ceramic materials. The present invention uses GH4169 superalloy metal sintering aid, Y 2 o 3 and Al 2 o 3 Inorganic oxide sintering aids are used as composite sintering aids. In the liquid phase sintering aid stage, the composite sintering aids form a staged sintering densification process according to the difference in melting point temperature, which promotes the liquid phase sintering of Sialon ceramic materials and accelerates the densification process. Reduced sintering temperature for Sialon-based ceramics. At the same time, in the liquid phase dominated by the GH4169 superalloy, the Cr, Fe, Ni, Nb, and Mo elements contained in it gather to the grain boundaries and react with some free Si elements, which are easy to form at the grain boundaries. The intercrystalline glass phase makes the prepared ultrafine-grain Sialon-based ceramics have high-temperature plasticity.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to an ultrafine-grained Sialon-based ceramic material with high-temperature plasticity and a preparation method thereof. Background technique [0002] As a high-temperature structural material of the Si-Al-O-N quaternary system, Sialon ceramics not only have excellent mechanical properties, such as high-temperature strength, high hardness, and good fracture toughness, but also have superior physical properties, such as creep resistance. , oxidation resistance and thermal shock resistance, have broad development prospects in high-temperature structural ceramic materials, and are widely used in transportation, petrochemical, metal smelting, aerospace and other fields. [0003] At present, Sialon ceramic materials are generally hard and brittle, and their high-temperature plasticity is poor, which makes them have problems such as high processing cost, difficult processing, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/597C04B35/622C04B35/64
CPCC04B35/597C04B35/622C04B35/64C04B2235/3217C04B2235/3225C04B2235/3865C04B2235/3873C04B2235/656
Inventor 骆俊廷郗晨阳王昊天张丽丽张春祥
Owner YANSHAN UNIV
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