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Nano-nano type Al2O3-base heterogeneous ceramic and its preparing method

A multi-phase ceramic and nano-type technology is applied in the preparation of high-performance structural ceramics with nano-nano-type composite structure, nano-nano-type Al2O3-based multi-phase ceramics and the field of preparation thereof, which can solve the problem of rapid grain growth and difficult to obtain. Dense nano-nano-type composite ceramics, grain size control, etc., to achieve uniform grain size distribution, short sintering time, and easy operation.

Inactive Publication Date: 2007-06-27
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nano-nano Al 2 o 3 base (Al 2 o 3 / SiC) The matrix and the second phase grain size of the composite ceramics should be kept at the nanometer scale. Due to the high activity of the nanoparticles, the grain boundary diffusion is very fast during the sintering process, and the rapid growth of the grains is very easy to occur. Therefore, conventional The ceramic sintering method is difficult to control the grain size at the nanometer level, that is, it is difficult to obtain dense nano-nano Al 2 o 3 matrix composite ceramics

Method used

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  • Nano-nano type Al2O3-base heterogeneous ceramic and its preparing method
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  • Nano-nano type Al2O3-base heterogeneous ceramic and its preparing method

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Embodiment 1

[0031] Embodiment 1: see accompanying drawing 1-3.

[0032] A kind of nano-nano type Al 2 o 3 A method for preparing a base composite phase ceramic, the preparation method comprising the following steps:

[0033] (1) Ingredients ball mill

[0034] Nano Al2 o 3 powder, nano-SiC powder according to 70Vol% Al 2 o 3 -30Vol% SiC volume percentage example After taking the ingredients, mix and place in a planetary ball mill, ball mill in absolute ethanol solvent at 400 rpm for 10 hours, then filter, dry at 60-120°C, pass through 60 Mesh sieve to obtain nanocomposite powder with evenly dispersed toughening and reinforcing phase;

[0035] (2) Molding

[0036] At room temperature and a pressure of 10MPa, the nanocomposite powder is pre-pressed into a Φ28.6×10mm disc with a steel mold, and then the pre-pressed disc is placed in a rubber elastic mold, under a pressure of 200MPa cold isostatic pressing into green body 1;

[0037] (3) Body heat treatment

[0038] Heat-treat the gr...

Embodiment 2

[0045] Embodiment 2: see accompanying drawing 1,2,4.

[0046] A kind of nano-nano type Al 2 o 3 A method for preparing a base composite phase ceramic, the preparation method comprising the following steps:

[0047] (1) Ingredients ball mill

[0048] Nano Al 2 o 3 powder, nano-SiC powder according to 95Vol% Al 2 o 3 -5Vol% SiC volume percentage example After taking the ingredients, mix and place in a planetary ball mill, ball mill in absolute ethanol solvent at 150 rpm for 24 hours, then filter, dry at 60-120°C, pass through 80 Mesh sieve to obtain nanocomposite powder with evenly dispersed toughening and reinforcing phase;

[0049] (2) Molding

[0050] At room temperature and a pressure of 5MPa, pre-press the nanocomposite powder into a Φ18×10mm disc with a steel mold, then put the pre-pressed disc into a rubber elastic mold, and cool it under a pressure of 250MPa. static pressure molding into green body 1;

[0051] (3) Body heat treatment

[0052] heat-treating the...

Embodiment 3

[0059] Embodiment 3: see accompanying drawing 1,2,5.

[0060] A kind of nano-nano type Al 2 o 3 A method for preparing a base composite phase ceramic, the preparation method comprising the following steps:

[0061] (1) Ingredients ball mill

[0062] Nano Al 2 o 3 powder, nano-SiC powder according to 80Vol% Al 2 o 3 -20Vol% SiC volume percentage example After taking the ingredients, mix and place in a planetary ball mill, ball mill in absolute ethanol solvent at 400 rpm for 48 hours, then filter, dry at 60-120°C, and pass through 20 Mesh sieve to obtain nanocomposite powder with evenly dispersed toughening and reinforcing phase;

[0063] (2) Molding

[0064] At room temperature and a pressure of 5MPa, the nanocomposite powder is pre-pressed into a Φ28.6×10mm disc with a steel mold, and then the pre-pressed disc is placed in a rubber elastic mold, under a pressure of 250MPa cold isostatic pressing into green body 1;

[0065] (3) Body heat treatment

[0066] heat-treat...

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Abstract

The nanometer-nanometer type Al2O3-base heterogeneous ceramic consists of nanometer Al2O3 50-95 vol%, and nanometer SiC, TiC, Si3N4, AlN, BN, TiN or ZrB2 5-50 vol%. Its preparation process includes steps of preparing material, ball milling, forming, heat treatment of biscuit, assembling biscuit, high pressure sintering, etc. The present invention adopts high pressure and low temperature fast sintering without need of atmosphere control, and the produced nanometer-nanometer type Al2O3-base heterogeneous ceramic has homogeneously nanometer level crystal grain distribution, high density and excellent performance, and may be used in crucial conditions, such as being used as ceramic cutter, antiwear and anticorrosive device, high temperature utensil, etc.

Description

technical field [0001] The present invention relates to a kind of ceramic and its preparation method, particularly to a kind of nano-nano type Al 2 o 3 The matrix composite phase ceramics and the preparation method thereof are mainly used in the preparation of high-performance structural ceramics with a nano-nano composite structure. Background technique [0002] In modern ceramics, structural ceramics occupy an important position and the largest proportion. Structural ceramics mainly refer to the use of their mechanical, thermal and chemical properties, such as high temperature resistance, erosion resistance, corrosion resistance, wear resistance, high hardness, high strength, low creep rate, etc., as structural materials under severe working conditions. It plays a key role in energy, aerospace, machinery, automobile, metallurgy, chemical industry, electronics and so on. The rise of nanostructured ceramics marks that the research and development of structural ceramics ha...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/56C04B35/58C04B35/622
Inventor 滕元成孙致平杨滨维鲁伟员
Owner SOUTHWEAT UNIV OF SCI & TECH
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