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Process for synthesizing superfine aluminium nitride powder and aluminium based heterogeneous ceramic powder by SHS method

A composite ceramic, self-propagating high-temperature technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems that large-scale or even large-scale production cannot be realized, and the weight of synthetic samples is small.

Inactive Publication Date: 2003-08-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent uses ammonium halide as the nitrogen source, and the weight of the synthesized sample is very small, which cannot achieve large-scale or even large-scale production

Method used

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  • Process for synthesizing superfine aluminium nitride powder and aluminium based heterogeneous ceramic powder by SHS method
  • Process for synthesizing superfine aluminium nitride powder and aluminium based heterogeneous ceramic powder by SHS method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] Example 1: Synthesis of ultrafine aluminum nitride powder by SHS

[0016] The purity of the aluminum powder used in the experiment is greater than 99%, and the particle size is 250-300 mesh; the purity of AlN is 99.4%, and the particle size is less than 300 mesh. Reactant content: Al is 80wt%, AlN is 20wt%. In order to prevent the hydrolysis of AlN, use acetone as the medium, ball mill in an agate jar for 6 hours, dry in the air, loosely pack in the combustion chamber, or press into a certain powder with a limit mold, powder and loose reactants The diameter is 120mm. Ignited under the nitrogen pressure of 7MPa, the prepared aluminum nitride is completely nitrided, and its specific surface is 2-6m 2 / g, the equivalent particle size is 0.3-0.9μm.

example 2

[0017] Example 2: Synthesis of AlN / ZrN / Al by SHS 3 Zr composite ceramic powder

[0018] The properties of Al and AlN powder in the original reactant are the same as in Example 1. The purity of Zr powder is greater than 98%, and the particle size is less than 200 mesh.

[0019] The composition ratio of the powder is 31wt% AlN powder, 15.8wt% Al powder and 53.2wt% Zr powder, the density of the green body is 45%, the nitrogen pressure of the SHS reaction is 5MPa, and the obtained product is AlN / ZrN / Al 3 Zr multiphase ceramic powder, the particle size is between 2-5μm.

example 3

[0020] Example 3: Synthesis of AlN / ZrN composite ceramic powder by SHS

[0021] The properties of Al and AlN powder in the original reactant are the same as in Example 1. The purity of ZrN powder is greater than 98%, and the particle size is less than 300 mesh.

[0022] The composition ratio of the powder is 80wt% Al powder and 20wt% ZrN powder, the density of the green body is 45%, the nitrogen pressure of the SHS reaction is 5MPa, and the obtained product is an AlN / ZrN composite ceramic powder with a particle size of 2- Between 5μm.

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Abstract

The present invention provides a method for synthesizing ultrafine AlN ceramic powder and AlN base heterogeneous ceramic powder by SHS process. For preparation of AlN powder body the original reactant composition includes 50-90 wt% of Al powder and 10-50 wt% of AlN powder, the density of biscuit is 35-60% and the pressure of nitrogen gas is 1-30 MPa. For AlN / ZrN / Al3Zr composite phase ceramic powder the original reactant powder composition includes 0-40 wt% of AlN powder, 0-30 wt% of ZrN powder, 10-85 wt% of Al powder and 30-70 wt% of Zr powder, density of biscuit is 35-50%, the nitrogen gas pressure for SHS reaction is 1-30 MPa. For AlN / ZrN composite phase ceramic powder the original reactant powder composition includes 70-80 wt% of Zr powder and 20-30 wt% of AiN powder, density of biscuit is 35-50%.

Description

Technical field: [0001] The invention relates to a class of ultrafine AlN ceramic powder and AlN-based multiphase ceramic powder prepared by a self-propagating high-temperature synthesis (SHS) method. Background technique [0002] Since the former Soviet scholars A.G.Merzhanov and I.P.Borovinskaya discovered the SHS phenomenon in 1967, SHS has been one of the most active research directions in the field of materials science and engineering. Its basic features are: using externally provided necessary energy to induce a local chemical reaction in a highly exothermic chemical reaction system (this process is called ignition), forming a chemical reaction front (that is, a combustion wave), after which the chemical reaction releases heat by itself. With the support, continue to move forward, showing that the combustion wave spreads throughout the reaction system, and finally synthesizes materials. The most prominent advantages of the SHS synthesis process are energy saving, simp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/072C04B35/581C04B35/582C04B35/64
Inventor 葛昌纯陈克新李江涛
Owner UNIV OF SCI & TECH BEIJING