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
CN102115332AInactive Publication Date: 2011-07-06DALIAN MARITIME UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN MARITIME UNIVERSITY
Publication Date
2011-07-06
Estimated Expiration
Not applicable · inactive patent

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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.
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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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