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A kind of preparation method of sapphire whisker and ZRO2 synergistically toughened Al2O3 ceramics

A technology of zro2-ce2o3 and sapphire, which is applied in the field of preparation of sapphire whiskers and ZrO2 synergistically toughened Al2O3 ceramics, can solve the problems of harsh synthesis process, difficulty in preparing high-performance ceramic materials, and difficult control of toughening effect, etc. The effect of uneven distribution and simplified preparation process

Active Publication Date: 2018-11-09
吉林长玉特陶新材料技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in situ synthesis of Al 2 o 3 Whiskers are prepared from Al 2 o 3 The main method of whisker toughening and reinforcing ceramics, the synthesis process is harsh and the toughening effect is difficult to control, it is difficult to prepare high-performance ceramic materials in a short period of time

Method used

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  • A kind of preparation method of sapphire whisker and ZRO2 synergistically toughened Al2O3 ceramics
  • A kind of preparation method of sapphire whisker and ZRO2 synergistically toughened Al2O3 ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Al 2 o 3w with ZrO 2 synergistically toughened Al 2 o 3 Ceramic materials, the specific method is as follows:

[0026] (1) with Al 2 o 3 powder as matrix raw material, with Al 2 o 3w For the toughening and reinforcing phase, ZrO 2 Powder is the toughening phase, where Al 2 o 3 Powder particle size 2 o 3w The aspect ratio of > 3:1, the length > 5μm, ZrO 2 The particle size of the powder is less than 1μm, as CeO 2 As a stabilizer, CeO 2 The purity is 99.9%, the Al 2 o 3w Stir mechanically for 15 minutes, then press Al 2 o 3 : ZrO 2 -CeO 2 :Al 2 o 3w The volume fraction ratio is 75%: 15%: 10% for batching, where ZrO 2 -CeO 2 ZrO in 2 : CeO 2 The molar mass fraction ratio is 88%: 12%, with absolute ethanol as solvent, with ZrO 2 The ball is used as a ball milling medium, mixed on a roller ball mill for 24 hours, and the resulting suspension is ultrasonically treated for 15 minutes, dried and granulated to obtain Al 2 o 3 -ZrO 2 -CeO 2 -Al 2 o ...

Embodiment 2

[0030] Press Al 2 o 3 The volume fraction of powder is 60%, ZrO 2 -Y 2 o 3 The volume fraction is 20%, Al 2 o 3w The volume fraction is 20% for batching, where ZrO 2 : Y 2 o 3 The molar mass fraction ratio is 97%: 3%, and Al is prepared according to the method in Example 1 2 o 3 For ceramics, heat up to 1400°C and hold for 2 hours, and the sintering atmosphere is air during the whole process. The Al prepared in this example 2 o 3 The relative density of the ceramic is 99.1%, the hardness is 13Gpa, the bending strength is 1000MPa, and the fracture toughness is 6.5MPa m 1 / 2 .

Embodiment 3

[0032] Press Al 2 o 3 The volume fraction of powder is 80%, ZrO 2 -Yb 2 o 3 The volume fraction is 10%, Al 2 o 3w The volume fraction is 10% for batching, where ZrO 2 : Yb 2 o 3 The molar mass fraction ratio is 92%: 8%, and Al is prepared according to the method in Example 1 2 o 3 For ceramics, heat up to 1500°C and hold for 2 hours, and the sintering atmosphere is air during the whole process. The Al prepared in this example 2 o 3 The relative density of the ceramic is 99.5%, the hardness is 12Gpa, the bending strength is 950MPa, and the fracture toughness is 6MPa m 1 / 2 .

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Abstract

The invention provides a preparation method of sapphire whisker and ZrO2 synergistically toughened Al2O3 ceramic. The preparation method comprises the following steps that 1, Al2O3 powder is used as a raw material, a sapphire whisker Al2O3w serves as a toughening reinforcing phase, ZrO2 powder serves as a toughening phase, Re2O3 serves as a stabilizer, the sapphire whisker Al2O3w is stirred, material mixture is performed according to the 60-90%: 5-20%: 2-20% volume fraction ratio of the Al2O3 to ZrO2-Re2O3 to Al2O3w, and then ultrasonic treatment, drying and granulation are performed to obtain mixed powder of Al2O3-ZrO2-Re2O3-Al2O3w, wherein the molar mass fraction ratio of ZrO2 to Re2O3 in the ZrO2-Re2O3 is (85-99)%:(1-15)%; 2, the mixed powder of the Al2O3-ZrO2-Re2O3-Al2O3w is integrally formed, and the sapphire whisker and ZrO2 synergistically toughened Al2O3 ceramic is prepared through sintering. A material preparation process is simplified, and the problem of uneven whisker distribution in a ceramic substrate is solved.

Description

technical field [0001] The invention relates to the field of oxide-based ceramic materials, and specifically discloses a sapphire whisker and ZrO 2 synergistically toughened Al 2 o 3 Methods of preparation of ceramics. Background technique [0002] Al 2 o 3 Ceramics have excellent properties such as high hardness, high resistivity, and good chemical stability, and are widely used in ceramic knives, ceramic substrates, thermocouple protection tubes, and wear-resistant bushings. Al 2 o 3 Ceramics generally have the problem of low fracture toughness. In Al 2 o 3 ZrO 2 Improving toughness with whiskers is a common approach. SiC whiskers are toughened Al 2 o 3 A kind of whisker is introduced, but at higher temperature, this non-oxide whisker is easy to combine with Al 2 o 3 The matrix reacts, rendering the material useless. [0003] By introducing with Al 2 o 3 Al with the same base composition 2 o 3w With the toughened material, it will not react with the matr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/119C04B35/81C04B35/626
CPCC04B35/119C04B35/6261C04B35/62625C04B35/803C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/5276C04B2235/5445C04B2235/5454C04B2235/77C04B2235/96
Inventor 郭伟明吴利翔王宏建林华泰
Owner 吉林长玉特陶新材料技术股份有限公司
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