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High-strength beta-SiAlON ceramic and pressureless sintering preparation method thereof

A high-strength, ceramic technology, applied in the field of high-strength β-SiAlON ceramic materials and its pressureless sintering preparation, to achieve the effect of reducing raw material loss and processing loss, reducing processing difficulty, and simple preparation process

Inactive Publication Date: 2011-07-06
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are no patents for the preparation method of β-SiAlON bulk materials at home and abroad

Method used

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  • High-strength beta-SiAlON ceramic and pressureless sintering preparation method thereof
  • High-strength beta-SiAlON ceramic and pressureless sintering preparation method thereof
  • High-strength beta-SiAlON ceramic and pressureless sintering preparation method thereof

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Embodiment 1

[0032] Doped with yttrium oxide, using silicon nitride, aluminum nitride and aluminum oxide powder as raw materials. According to the molecular formula Si 6-z Al z O z N 8-z Calculate the mass percentage of silicon nitride, aluminum nitride, and aluminum oxide in the raw material powder when 1.6<z<2.5, and then weigh the yttrium oxide powder at 4% of the total mass of the above powder, and place the weighed powder in Anhydrous ethanol is used as the dispersion medium in the polytetrafluoroethylene tank, and silicon nitride balls are used as the ball milling medium for 24 hours. After drying, the mixed slurry is put into a metal mold and molded under a pressure of 40 MPa. The blank is placed in a graphite mold spread with graphite paper and SiAlON powder, and β- is prepared by the pressureless sintering process described above. The SiAlON ceramic material is processed with a diamond cutting machine, grinder and polishing machine to obtain ceramic material samples for performance...

Embodiment 2

[0034] In this embodiment, the content of yttrium oxide is 2wt%, and the other composition and preparation method are the same as the β-SiAlON composition of the first embodiment.

Embodiment 3

[0036] In this embodiment, the content of neodymium oxide is 3wt%, and the other composition and preparation method are the same as the β-SiAlON composition of the first embodiment.

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Abstract

The invention belongs to the field of preparation of high-performance ceramic materials and particularly relates to a method for preparing a high-strength beta-SiAlON ceramic material by adopting the pressureless sintering technology. Silicon nitride powder, aluminum nitride powder and alumina powder are taken as raw materials, the ceramic material is designed according to the general formula Si6-zAlzOzN8-z (z is between 1 to 3.5) of eta-SiAlON, Y2O3 or one or more rare-earth oxides (such as Nd2O3, Yb2O3, etc.) are added as sintering aids, the raw material powders are mixed in absolute ethyl alcohol medium and then dried and granulated, and the sample molded by cold pressing is buried in a SiAlON filler and sintered in flow nitrogen atmosphere. No mechanical pressure is required to be applied during the ceramic sintering process, the complicated shape and the special-shaped component are easily manufactured, and the processing difficulty and the loss can be reduced, so that the methodhas a broader application prospect.

Description

Technical field [0001] The invention belongs to the technical field of high-performance ceramic materials, and specifically relates to a high-strength β-SiAlON ceramic material and a pressureless sintering preparation method thereof. Background technique [0002] β-SiAlON is β-Si 3 N 4 With AlN·Al 2 O 3 Solid solution, structure and β-Si 3 N 4 Same as Si, physical properties 3 N 4 Similar, chemical properties close to Al 2 O 3 , Has the advantages of high temperature resistance, good mechanical properties, good thermal shock resistance, good thermal stability and good chemical stability. It is considered to be one of the most promising high-temperature structural ceramics. It has special use value in the working environment of high temperature, high speed and strong corrosive medium, and has wide application potential in the field of aviation and aerospace electronics. [0003] The research on preparation of β-SiAlON by pressureless sintering has been carried out as early as the 19...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/599C04B35/622C04B35/64
Inventor 单英春徐久军朱峰王光
Owner DALIAN MARITIME UNIVERSITY
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