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Ceramic channel used in cryogenic liquid helium environment and preparation method thereof

A ceramic and channel technology, which is applied in the field of high-performance ceramic preparation, can solve the problems of long-term service performance that cannot meet the stable operation of the device, achieve the effects of fine grain size, improved radiation resistance performance, and overcome the deterioration of air tightness

Inactive Publication Date: 2018-05-08
TSINGHUA UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a ceramic channel for low-temperature liquid helium environment, which has good low-temperature mechanical properties, strong radiation resistance, and long service life, and can solve the problems existing in the currently used fiber-reinforced epoxy resin composite material liquid helium channel. Defects that long-term service performance cannot meet the needs of stable operation of the device

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  • Ceramic channel used in cryogenic liquid helium environment and preparation method thereof

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Embodiment Construction

[0027] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0028] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0029] Such as figure 1 As shown, the ceramic material insulation channel of the present invention has an inner diameter of 8 mm and an outer diameter of 25 mm. There is a groove with an inner diameter of 18mm at both ends of the ceramic channel, which is convenient for welding with 316L stainless steel seamless pipe. Concretely prepare according to the following steps:

[0030] Step 1: Mixing of ceramic powder.

[0031] Accurately weigh ceramic powder and organic solvent, and use ball milling method to mix the weighed ceramic powder and organic solvent evenly to obtain liquid slurry. In the mixture, the mass percentage of ceramic powder is 98%, and the mass percentage of organic solvent is 2%; wherein, the ceramic powder (p...

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Abstract

The invention discloses a ceramic channel used in a cryogenic liquid helium environment and a preparation method thereof. The method includes the following steps of mixing ceramic powder with an organic solvent to obtain a mixture, conducting cold isostatic pressing and high-temperature sintering on the mixture to obtain the ceramic channel, and connecting the ceramic channel and a metal connectorin a sealing mode. The ceramic powder is yttria-stabilized zirconia powder in which the molar percentage of yttria is 2 to 3%. According to the method, a zirconia ceramic material is used to replacecommon fiber and epoxy resin materials to make the liquid helium channel, so that the strength, toughness, corrosion resistance and radiation resistance of the channel are all significantly improved,and the service life is greatly prolonged. The shortcomings that the fiber and the epoxy resin materials are prone to ageing and lead to deterioration of airtightness are overcome, and the requirements of a full superconducting tokamak device for the liquid helium channel can be met.

Description

technical field [0001] The invention relates to a ceramic channel used in a low-temperature liquid helium environment and a preparation method thereof, belonging to the technical field of high-performance ceramic preparation. Background technique [0002] Liquid helium channels (also known as axial or radial insulators) are key components of large-scale superconducting magnet systems. There are more than 1,000 large and small pieces in the EAST (Experimental Advanced Superconducting Tokamak) mainframe of my country's large scientific engineering project. Unequal liquid helium channels. During the operation of the device, the axial insulator constitutes a cooling circuit through the pipeline and the corresponding cold parts, which is responsible for the passage of the cryogenic liquid for the superconducting magnet, and at the same time is responsible for the insulation to the ground. The International Thermonuclear Experimental Reactor (ITER), one of the large-scale scientif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622C04B37/00H01F6/04F25D3/10
CPCC04B35/48C04B35/622C04B37/006C04B2235/3225C04B2235/5436C04B2235/602C04B2235/656C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B2237/122F25D3/10H01F6/04
Inventor 谢志鹏桂经亚
Owner TSINGHUA UNIV
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