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A method of nano-impregnated transient eutectic phase-connected SIC ceramics and its prepared ceramics and applications

A eutectic phase and transient technology, applied in the direction of reactors, reactor fuel elements, distance measurement, etc., can solve the problems of weak thermal shock resistance, difficult parts, large manufacturing size, etc., to achieve a dense connection layer and a dense connection layer. The effect of defects

Active Publication Date: 2021-08-10
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the brittleness, low impact toughness and weak thermal shock resistance of ceramic materials, their processing performance is poor, and it is difficult to manufacture parts with large sizes and complex shapes. Therefore, it is necessary to use the connection technology between ceramics to produce complex shapes. parts
At present, in the connection method of SiC ceramics, the nano-impregnated transient eutectic phase has the highest shear strength, and has good corrosion resistance and neutron radiation resistance. However, when using nano-impregnated transient eutectic phase generally High temperature and high pressure, which is the cladding tube and the most critical protective cover for accident-tolerant fuel (the first layer of protective material used to wrap nuclear fuel in nuclear reactors. This material directly withstands all neutron radiation in nuclear reactors and is also the most critical shield). A fatal flaw for end plug connections

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation: Nano-SiC powder, Al 2 o 3 and Ho 2 o 3 As a connecting material, SiC powder has a purity of 99% and a particle size of 10nm; Al 2 o 3 The purity is 99%, the particle size is 0.1μm; Ho 2 o 3 The purity is 99%, the particle size is 0.1μm; SiC:Al 2 o 3 :Ho 2 o 3 The mass percentage is 93wt%: 2wt%: 5wt%. The connecting material powder is mixed on a planetary ball mill for 8 hours according to the above ratio. The solvent is absolute ethanol. The mixed powder obtained after drying is spread in the middle of two polished SiC A sandwich structure is formed, and subjected to 500MPa cold isostatic pressing, and then connected in a heat treatment furnace. The specific process parameters of the connection are: heating up to 800°C at 20°C / min, then rising to 1400°C at 10°C / min, holding for 1 hour, pressurizing 0.1MPa, and the connection environment is vacuum.

[0029] 2. Performance test: After the connection in this example, the connection strength of th...

Embodiment 2

[0031] 1. Preparation: Nano-SiC powder, Al 2 o 3 and CeO 2 As a connecting material, the particle size of SiC is 100nm; Al 2 o 3 The particle size is 5 μm; Ho 2 o 3 Particle size is 5μm; SiC:Al 2 o 3 :CeO 2 The mass percentage is 90wt%: 5wt%: 5wt%, connected according to the method of Example 1, wherein the cold isostatic pressing pressure is 200MPa, and the sintering process is: heating up to 800°C at 20°C / min, and then heating at 10°C / min Raise the temperature to 1500°C, keep it warm for 1 hour, pressurize at 0.01MPa, and connect the environment to vacuum.

[0032] 2. Performance test: After the connection in this example, the connection strength of the workpiece at room temperature is 180MPa, and the connection strength at 1600°C is 150MPa; it is corroded for 30 days in an autoclave under 360°C / 18.6MPa / pure water corrosion conditions, The corrosion rate is consistent with that of the substrate; after the connection, there is no thermal stress concentration between ...

Embodiment 3

[0034] 1. Preparation: Nano-SiC powder, Al 2 o 3 and Ho 2 o 3 As a connecting material, the particle size of SiC is 50nm; Al 2 o 3 The particle size is 10μm; Ho 2 o 3 Particle size is 10μm; SiC:Al 2 o 3 :Ho 2 o 3 The mass percentage is 90wt%: 5wt%: 5wt%, connected according to the method of Example 1, wherein the cold isostatic pressing pressure is 300MPa, and the sintering process is: heating up at 20°C / min to 800°C, and then raising the temperature at 10°C / min To 1600°C, keep warm for 0.5h, pressurize 0.01MPa, and connect the environment to vacuum.

[0035] 2. Performance test: the connection strength of the workpiece after connection in this example is 200MPa at room temperature, and 180MPa at a high temperature of 1600°C; it is corroded for 50 days in an autoclave under 360°C / 18.6MPa / pure water corrosion conditions, The corrosion rate is consistent with the substrate; after the connection, the base metal and the connection layer have no thermal stress concentrat...

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Abstract

The invention belongs to the technical field of ceramic connection and discloses a method for connecting SiC ceramics by nano impregnating transient eutectic phase. The method is to combine SiC powder and Al 2 o 3 -M x o y The mixed powder A is used as the connecting material, the M x o y = Ho 2 o 3 or CeO 2 , the mixed powder A is added to the solvent and the ball milling medium, mixed and dried, and the obtained mixed powder B is granulated, and the powder is spread in the middle of two polished SiC to form a sandwich structure; Under the protection of the atmosphere, pressurize 0.01-0.1MPa, first raise the temperature to 600-1000°C for heat preservation Ⅰ, then raise the temperature to 1450-1600°C for heat preservation Ⅱ, the heat preservation pressure is 200-500MPa, and connect to obtain nano-impregnated transient eutectic phase connection SiC ceramics. The invention realizes the low-temperature and low-pressure connection of SiC ceramics, and the leakage rate of the connection reaches 0-1×10 ‑ 8 Pa·L / s.

Description

technical field [0001] The invention belongs to the technical field of non-oxide ceramic materials, and more specifically relates to a method for nano-impregnating transient eutectic phase-bonded SiC ceramics and the prepared ceramics and applications. Background technique [0002] SiC ceramics generally have excellent characteristics such as high temperature resistance, high hardness, wear resistance, corrosion resistance, and high temperature strength. They are key materials for the development of new technologies in sectors such as automobiles, machinery, metallurgy, and aerospace. In addition, pure SiC can be applied as accident-tolerant fuel in nuclear reactors due to its high thermal conductivity, resistance to neutron irradiation, and low neutron absorption cross section. [0003] However, due to the brittleness, low impact toughness and weak thermal shock resistance of ceramic materials, their processing performance is poor, and it is difficult to manufacture parts w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/626G21C3/07
CPCC04B35/565C04B35/622C04B35/62605C04B2235/3217C04B2235/3224C04B2235/3229C04B2235/6562C04B2235/6567C04B2235/661C04B2235/9669G21C3/07Y02E30/30
Inventor 郭伟明吴利翔朱林林牛文彬卫紫君林锐霖林华泰
Owner GUANGDONG UNIV OF TECH
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