Low cost and high performance porous beta-SiAlON ceramics, and preparation method thereof

A high-performance, low-cost technology, applied in the field of porous ceramics and materials, can solve the problems of high reaction temperature, easy carbon residue, long reaction cycle, etc., and achieve the effect of reducing manufacturing cost, simple preparation process and light weight

Inactive Publication Date: 2014-09-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural raw materials are all solid, mixed unevenly, the reaction temperature is still high, the reaction cycle is long, the phase composition of the product is complex, and the carbon in the raw material is easy to remain, which affects the purity and performance of the product.
[0007] At present, no Si powder and Al 2 o 3 Powder as raw material, adding a small amount of sintering aids, the open invention patent on the preparation of porous β-SiAlON

Method used

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  • Low cost and high performance porous beta-SiAlON ceramics, and preparation method thereof
  • Low cost and high performance porous beta-SiAlON ceramics, and preparation method thereof
  • Low cost and high performance porous beta-SiAlON ceramics, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The process steps are as follows:

[0032] (1) Ball milling: take 30wt.% Al according to the design composition 2 o 3 After Si powder and 70wt.% Si powder, with absolute ethanol as the mixing medium, add by 60% of the total mass of the powder, use agate balls as grinding balls, powder: agate balls=1: 1 (mass ratio) , placed in a nylon tank and mixed with a rolling ball mill for 12 hours;

[0033] (2) Drying: place the wet-milled slurry in a drying oven to dry at 60°C;

[0034] (3) Molding: add 5wt.% of 10wt.% polyvinyl alcohol solution as a binder, and mold it at a uniaxial pressure of 50MPa;

[0035] (4) Reaction sintering: reaction sintering in a nitrogen atmosphere, the sintering temperature is 1350°C, the holding time is 3h, and the nitrogen pressure is 0.6MPa;

[0036] (5) High temperature sintering: after nitriding, the sample is sintered at high temperature, the sintering temperature is 1700°C, and the holding time is 2h;

[0037] The product of the present ...

Embodiment 2

[0039] (1) Ball milling: Weigh Al according to the design composition 2 o 3 After powder is 50wt.% and Si powder is 50wt.% raw material, with dehydrated alcohol as mixing medium, add by 40% of material powder gross mass, use agate ball as grinding ball, material powder: agate ball=1: 1 (mass ratio), placed in a nylon tank and mixed with a rolling ball mill for 24 hours;

[0040] (2) Drying: place the wet-milled slurry in a drying oven to dry at 60°C;

[0041] (3) Molding: add 5wt.% of 10wt.% polyvinyl alcohol solution as a binder, and mold it under a uniaxial pressure of 200MPa;

[0042] (4) Reaction sintering: reaction sintering in a nitrogen atmosphere, the sintering temperature is 1350°C, the holding time is 3h, and the nitrogen pressure is 0.6MPa;

[0043] (5) High temperature sintering: after nitriding, the sample is sintered at high temperature, the sintering temperature is 1700°C, and the holding time is 2h;

[0044] The product of the present invention is a porous ...

Embodiment 3

[0046] (1) Ball milling: take 30wt.% Al according to the design composition 2 o 3 powder, 70wt.% Si powder and Al 2 o 3 Powder and Si powder total weight 3wt.%Y 2 o 3 Finally, with absolute ethanol as the mixing medium, add by 60% of the total mass of the material powder, use agate balls as grinding balls, material powder: agate balls=1: 1 (mass ratio), place in a nylon tank and use a roller Type ball mill mixing 24h;

[0047] (2) Drying: place the wet-milled slurry in a drying oven to dry at 60°C;

[0048] (3) Molding: Add 5wt.% polyvinyl alcohol solution with a concentration of 10wt.% as a binder, and mold it under a uniaxial pressure of 200MPa;

[0049] (4) Reaction sintering: reaction sintering in a nitrogen atmosphere, the sintering temperature is 1350°C, the holding time is 2h, and the nitrogen pressure is 0.6MPa;

[0050] (5) High temperature sintering: after nitriding, the sample is sintered at high temperature, the sintering temperature is 1700°C, and the holdi...

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Abstract

The invention discloses a low cost and high performance porous beta-SiAlON ceramics, and a preparation method thereof. According to the invention, Si powder, Al2O3 powder and Sm2O3 are blended and mixed according to a certain mass ratio; the mixture is added to absolute alcohol, such that a mixed material is obtained; the mixed material is grinded; the grinded material is processed through steps of drying, granulating, and molding, such that a ceramic preform is obtained; the ceramic preform is sintered under a nitrogen atmosphere, such that a sample is obtained; the sample is sintered under a high temperature, such that porous beta-SiAlON ceramics is obtained. The preparation technology of the invention is simple, and the method is suitable for industrialized productions. With the method, accurate controlling upon the dimension of the sintered sample can be realized. Porous beta-SiAlON ceramics prepared with the method provided by the invention has characteristics of light weight and high strength. The obtained material has an open porosity of 10 to 40% and a bending strength of 90 to 340Mpa.

Description

technical field [0001] The invention belongs to the field of materials, relates to a preparation method of low-cost and high-performance porous β-SiAlON ceramics, and belongs to the field of porous ceramics. Background technique [0002] β-SiAlON is a compound composed of Si, Al, O, N, in β-Si 3 N 4 In the solid solution formed by replacing Si-N with Al-O in equal amounts, it is therefore compatible with β-Si 3 N 4 have similar crystal structures. which incorporates Si 3 N 4 and Al 2 o 3 Their respective characteristics have the characteristics of high temperature strength and hardness, small creep, oxidation resistance, corrosion resistance, wear resistance, small coefficient of thermal expansion, good thermal shock resistance, and high fracture toughness. [0003] In recent years, there have been many studies on β-SiAlON materials, but its practical application is still limited. This is due to the limitation of raw materials and processes, and the cost is too expen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/599C04B35/622
Inventor 王红洁何恩全岳建设乔冠军
Owner XI AN JIAOTONG UNIV
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