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Method for joining nano-impregnated transient eutectic phase with SiC ceramic as well as ceramic prepared by method and application

A eutectic phase and ceramic technology, which is applied in the field of nano-impregnated transient eutectic phase to connect SiC ceramics, can solve the problems of difficult parts, weak thermal shock resistance, large manufacturing size, etc., and achieve a dense and defect-free connection layer. dense effect

Active Publication Date: 2019-03-08
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, the 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 o...

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%. Connect according to the method of Example 1, wherein the cold isostatic pressing pressure is 200MPa, and the sintering process is: heat up to 800°C at 20°C / min, and then heat up to 800°C at 10°C / min Raise the temperature to 1500°C, hold the temperature for 1 hour, pressurize 0.01MPa, and connect the environment to vacuum.

[0032] 2. Performance test: The connection strength of the workpiece after connection in this example is 180MPa at room temperature, and 150MPa at a high temperature of 1600°C; it is corroded for 30 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 st...

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 joining and discloses a method for joining a nano-impregnated transient eutectic phase with SiC ceramic. The method comprises the following steps: taking mixed powder A of SiC powder and Al2O3-MxOy as a joining material, wherein MxOy is Ho2O3 or CeO2; adding a solvent and a ball milling medium into the mixed powder A for mixing and drying, then spreading powder obtained by granulating obtained mixed powder B between two pieces of polished SiC to form a sandwich structure; then carrying out isostatic cool pressing treatment, and pressurizing to 0.01 to 0.1MPa in a vacuum or atmosphere protection; raising the temperature to 600 to 1000 DEG C and insulating I; raising the temperature again to 1450 to 1600 DEG C and insulating II at the pressure of 200 to 500 MPa, and joining to obtain the nano-impregnated transient eutectic phase joined SiC ceramic. The method disclosed by the invention realizes low-temperature and low-pressure joining of the SiC ceramic, and the leak rate of the joining part reaches 0 to 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 Applications(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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