Whisker reinforced aluminum oxide composite ceramic as well as preparation method and application thereof

A composite ceramic and alumina technology, applied in the field of ceramic materials, can solve the problems of affecting the mechanical properties of wear resistance, the growth of alumina grains, and the high cost, and achieve the effects of improving toughness, reducing sintering temperature, and improving wear resistance.

Active Publication Date: 2019-11-22
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing methods for preparing silicon carbide whisker-reinforced alumina ceramics all adopt high-temperature hot-pressing sintering process, which consumes a lot of ene

Method used

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  • Whisker reinforced aluminum oxide composite ceramic as well as preparation method and application thereof
  • Whisker reinforced aluminum oxide composite ceramic as well as preparation method and application thereof
  • Whisker reinforced aluminum oxide composite ceramic as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 Al 2 o 3 -SiC whiskers

[0041] (1) Mixing: 75 grams of Al 2 o 3 25 grams of SiC whiskers (diameter 0.5um, aspect ratio 10-30) were added to absolute ethanol to make a mixed powder, and ultrasonically dispersed for 10 minutes; then put into grinding balls, the ball-to-material ratio was 1:1 , ball milled for 10 hours to obtain a slurry;

[0042] (2) Drying: put the ball-milled slurry into a rotary evaporator and dry at 60°C; after the powder is dried, pass through a 60-mesh sieve to obtain a mixed powder;

[0043] (3) Forming: the sieved mixed powder is formed by dry pressing with a steel mold with a diameter of 50 mm, and the pressure is 30 MPa to obtain a block of a corresponding shape, and then cold isostatic pressing is performed at a pressure of 200 MPa to obtain a green body;

[0044] (4) Hot-press flow sintering: use the hot-press flow sintering method to make the biscuit obtained in step (3) flow and sinter in a two-dimensional direction perpendic...

Embodiment 2

[0046] Example 2 Al 2 o 3 -SiC whisker-Y 2 o 3

[0047] (1) Mixing: 70 grams of Al 2 o 3 , 25 grams of SiC whiskers (diameter 0.5um, aspect ratio 10-30), 5 grams of sintering aid Y 2 o 3 Add it into absolute ethanol to make a mixed powder, and disperse it ultrasonically for 10 minutes; then put it into grinding balls with a ball-to-material ratio of 1:1, and ball mill for 10 hours to obtain a slurry;

[0048] (2) Drying: put the ball-milled slurry into a rotary evaporator and dry at 60°C; after the powder is dried, pass through a 60-mesh sieve to obtain a mixed powder;

[0049] (3) Forming: the sieved mixed powder is formed by dry pressing with a steel mold with a diameter of 50 mm, and the pressure is 30 MPa to obtain a block of a corresponding shape, and then cold isostatic pressing is performed at a pressure of 200 MPa to obtain a green body;

[0050] (4) Hot-press flow sintering: use the hot-press flow sintering method to make the biscuit obtained in step (3) flow ...

Embodiment 3

[0051] Example 3 Al 2 o 3 -SiC whisker-Y 2 o 3 -MgO

[0052] (1) Mixing: 70 grams of Al 2 o 3 , 20 grams of SiC whiskers (diameter 0.5um, aspect ratio 10-30), 4 grams of sintering aid Y 2 o 3 , 6 grams of sintering aid MgO were added in absolute ethanol, made into mixed powder, ultrasonically dispersed for 10 minutes; then put into grinding balls, the ball-to-material ratio was 1:1, and ball milled for 10 hours to obtain a slurry;

[0053] (2) Drying: put the ball-milled slurry into a rotary evaporator and dry at 60°C; after the powder is dried, pass through a 60-mesh sieve to obtain a mixed powder;

[0054] (3) Forming: the sieved mixed powder is formed by dry pressing with a steel mold with a diameter of 50 mm, and the pressure is 30 MPa to obtain a block of a corresponding shape, and then cold isostatic pressing is performed at a pressure of 200 MPa to obtain a green body;

[0055] (4) Hot-press flow sintering: use the hot-press flow sintering method to make the bis...

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Abstract

The invention relates to the technical field of ceramic materials, in particular to whisker reinforced aluminum oxide composite ceramic as well as a preparation method and application thereof. The composite ceramic is prepared from, by mass, 50-99.5 parts of aluminum oxide powder, 0.5-45 parts of whiskers, 0-20 parts of a sintering aid and 0-10 parts of a wear-resistant additive. The components are used as raw materials, a sample flows in a one-dimensional or two-dimensional direction in a mold by a hot-pressing flow sintering method, and the whiskers are directionally arranged to obtain the whisker-reinforced aluminum oxide composite ceramic. By texturing the whisker reinforced aluminum oxide composite ceramic, the toughness, strength, hardness and cutting performance of the aluminum oxide composite ceramic can be greatly improved. The whisker reinforced aluminum oxide composite ceramic prepared by the method is processed into a cutter which can be used for cutting a high-temperaturealloy at a high speed.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a whisker-reinforced alumina composite ceramic and its preparation method and application. Background technique [0002] Alumina ceramics have been widely studied and applied due to their high hardness, low density, corrosion resistance, high temperature resistance and many other advantages. They are mainly used in extreme environments such as high temperature, corrosion, strong wear and some electronic components, such as grinding balls , wear-resistant parts, electronic substrates, corrosion-resistant parts, etc. However, the brittleness and low strength of alumina ceramic materials greatly limit its application in various fields. The Oak Forest Laboratory of the U.S. Department of Energy has developed silicon carbide whisker-reinforced alumina ceramics (USPatent 4543345), which has superior fracture toughness, strength, wear resistance, corrosion resistance and exce...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/10C04B35/622C04B35/645
CPCC04B35/10C04B35/622C04B35/645C04B2235/5276C04B2235/3225C04B2235/3847C04B2235/3206C04B2235/3229
Inventor 蒋强国李建斌刘文勇王博刘杰
Owner GUANGDONG UNIV OF TECH
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