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High-toughness aluminum oxide ceramic, and preparation method and application thereof

A technology of alumina ceramics and high toughness, which is applied in the field of high toughness alumina ceramics and its preparation, and can solve the problems of alumina ceramics, such as the decrease of hardness, strength and fracture toughness of comprehensive mechanical properties, uneven distribution of additives, and long heat preservation time at high temperature. , to achieve fine and uniform microstructure, inhibit the growth of grains, and shorten the high-temperature holding time

Inactive Publication Date: 2013-10-16
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, some additives are often introduced to reduce the sintering temperature. However, the traditional way of introducing additives is to directly add the prepared additives into wet-mixed ball mills. change
Due to the high melting point of alumina, pressureless or pressure sintering is often used to prepare fully dense silicon carbide ceramics in industry. The sintering temperature used is usually high (over 1700°C), and the high temperature holding time is long (over 30min), resulting in The grain grows violently and hinders the removal of pores
The uneven distribution of CNTs and additives, as well as the existence of pores lead to a substantial decline in the comprehensive mechanical properties (such as hardness, strength, and fracture toughness) of alumina ceramics.

Method used

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  • High-toughness aluminum oxide ceramic, and preparation method and application thereof
  • High-toughness aluminum oxide ceramic, and preparation method and application thereof
  • High-toughness aluminum oxide ceramic, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] a) CNTs pretreatment

[0029]Prepare H at a volume ratio of 3:1 2 SO 4 / HNO 3 Mixed acid solution 100mL, put 1g of CNTs into the mixed acid solution, after ultrasonic treatment at 30°C for 24h, the CNTs in the mixed acid was viscous and black, after diluting the mixed acid solution, filter with suction, wash the CNTs with twice distilled water until pH= 7. After drying at 60°C, put it into polyvinyl alcohol with a mass percentage concentration of 5% for ultrasonic dispersion for 6 hours, then remove the solvent, and dry at 60°C to obtain 0.92 g of pretreated CNTs.

[0030] b) Preparation of nanopowders with "shell-core" composite structure

[0031] Al(OH) with an average particle size of 0.4μm and a purity of 99.98% is used 3 and Y(NO 3 ) 3 Powder. Weigh 12.5g Al(OH) 3 powder, 0.6gY (NO 3 ) 3 powder and 0.22g of pretreated CNTs were dissolved in 20mL of ethanol, and 0.05mL of n-butanol was added, and ultrasonically oscillated for 2h to make a uniformly dispers...

Embodiment 2

[0037] a) CNTs pretreatment

[0038] Prepare H at a volume ratio of 3:1 2 SO 4 / HNO 3 Mixed acid solution 100mL, put 1g of CNTs into the mixed acid solution, after ultrasonic treatment at 30°C for 24h, the CNTs in the mixed acid was viscous and black, after diluting the mixed acid solution, filter with suction, wash the CNTs with twice distilled water until pH= 7. After drying at 60°C, place it in polyvinyl alcohol with a mass percentage concentration of 8% for ultrasonic dispersion for 18 hours, then remove the solvent, and dry at 60°C to obtain 0.9 g of pretreated CNTs.

[0039] b) Preparation of nanopowders with "shell-core" composite structure

[0040] Al(OH) with an average particle size of 0.5μm and a purity of 99.96% is used 3 and Y(NO 3 ) 3 Powder. Weigh 15.6g Al(OH) 3 Powder, 0.55gY (NO 3 ) 3 powder and 0.24g of pretreated CNTs were dissolved in 20mL of ethanol, and 0.15 mL of PEG-400 dispersant was added, ultrasonically oscillated for 2 hours to make a unif...

Embodiment 3

[0046] a) CNTs pretreatment

[0047] Prepare H at a volume ratio of 3:1 2 SO 4 / HNO 3 Mixed acid solution 100mL, put 1g of CNTs into the mixed acid solution, after ultrasonic treatment at 30°C for 24h, the CNTs in the mixed acid was viscous and black, after diluting the mixed acid solution, filter with suction, wash the CNTs with twice distilled water until pH= 7. After drying at 60°C, put it into polyvinyl alcohol with a mass percentage concentration of 3% for ultrasonic dispersion for 24 hours, then remove the solvent and dry to obtain 0.91 g of pretreated CNTs;

[0048] b) Preparation of nanopowders with "shell-core" composite structure

[0049] Al(OH) with an average particle size of 0.8μm and a purity of 99.94% is used 3 and Y(NO 3 ) 3 Powder. Weigh 18.7g Al(OH) 3 powder, 0.5gY(NO 3 ) 3 powder and 0.26g of pretreated CNTs were dissolved in 20mL of ethanol, and 0.2mL of isopropanol was added, and ultrasonically oscillated for 2h to make a uniformly dispersed susp...

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Abstract

The invention discloses a high-toughness aluminum oxide ceramic, and a preparation method and application thereof. The preparation method comprises the following steps: by using aluminum hydroxide as the initial raw material and pretreated CNTs as a toughener, adding a sintering assistant Y2O3 in the form of Y(NO3)3 and adding dispersant, and carrying out uniform ultrasonic dispersion; while continuously stirring, dropwisely adding a slightly alkaline solution to form an additive ion precipitate, and forming a heterogeneous nucleation precipitate by using aluminum oxide particles and CNTs as the nucleating center; filtering, washing with alcohol, and drying to obtain nano mixed powder; and carrying out discharge plasma sintering and twin polishing treatment to obtain the high-toughness aluminum oxide ceramic. The invention successfully solves the problem that the CNTs and Al2O3 can not be easily evenly mixed proportionally directly by ball milling when using Y2O3 ceramic powder as a sintering assistant; and the invention also solves the problem that the Al2O3 ceramic can not be completely compacted when being sintered at low temperature, and has crystal grain growth when being sintered at high temperature.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-performance alumina ceramics, and in particular relates to a high-toughness alumina ceramic and its preparation method and application. Background technique [0002] Alumina ceramic is a kind of A1 2 o 3 As the main raw material, corundum (α-A1 2 o 3 ) is a ceramic material with a main crystal phase. Alumina ceramics are the ceramic materials with the widest application, the widest application and the largest output among oxide ceramics. Alumina-based ceramic materials have the characteristics of large elastic modulus, good thermal stability, light weight, low price, and abundant resources. They are widely used in high temperature, high pressure, radiation resistance, impact resistance, wear resistance, corrosion resistance and other environments. However, its inherent brittleness limits the scope of application. Currently developed and utilized TiC particles, SiC particles or wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/117C04B35/622
Inventor 易剑薛伟江谢志鹏高玉新程虎王蕾
Owner TAIZHOU UNIV
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