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A method of joining SIC ceramic materials using calcia/alumina/silicon dioxide/lithium oxide glass solder

A technology of lithium oxide glass and silicon dioxide, which is applied in the field of connecting SiC ceramic materials with calcium oxide/alumina/silicon dioxide/lithium oxide glass solder, can solve the problems of poor radiation resistance of joints, and achieve improved lubrication Reliability of wettability and interfacial bonding, ease of use, effect of improving mechanical properties

Active Publication Date: 2022-03-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problems that the connection of SiC ceramics needs high temperature and high pressure conditions under the service conditions of the current nuclear reactor, and the joint performance and radiation resistance are poor, and provides a glass solder using calcium oxide / alumina / silicon dioxide / lithium oxide Method for joining SiC ceramic materials

Method used

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  • A method of joining SIC ceramic materials using calcia/alumina/silicon dioxide/lithium oxide glass solder
  • A method of joining SIC ceramic materials using calcia/alumina/silicon dioxide/lithium oxide glass solder
  • A method of joining SIC ceramic materials using calcia/alumina/silicon dioxide/lithium oxide glass solder

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specific Embodiment approach 1

[0020] Specific implementation mode 1: This implementation mode is a method for connecting SiC ceramic materials using calcium oxide / alumina / silicon dioxide / lithium oxide glass solder, specifically according to the following steps:

[0021] 1. Prepare the base material: use an internal cutting machine to cut and prepare SiC ceramic blocks, and then use 400# and 800# diamond grinding discs on the pre-grinder to grind the surface to be welded, and then use the particle size of 3.5μm, 2.5μm and Grinding with 1 μm diamond abrasive paste, and finally using a diamond polishing agent with a particle size of 0.5 μm to perform mechanical polishing on a polishing machine until there is no scratch on the surface to be welded to obtain a SiC ceramic base material;

[0022] In order to improve the interface bonding between the base material and the solder during the welding process, a pre-oxidation treatment is carried out on the SiC base material. The process of the pre-oxidation treatment...

specific Embodiment approach 2

[0026] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, put the SiC ceramic base material obtained above into a muffle furnace, and raise the temperature from room temperature to 1300 °C at a rate of 10 °C / min. And keep it warm for 3 hours, and then lower the temperature to room temperature at a rate of 10°C / min to obtain a pre-oxidized SiC ceramic base material. Others are the same as the first embodiment.

specific Embodiment approach 3

[0027] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step two, at first weigh four kinds of raw material powders according to the following mass fractions: 20% CaO, 22% Al 2 o 3 , 55% SiO 2 and 3% Li 2 O. Others are the same as those in Embodiment 1 or 2.

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Abstract

A method for connecting SiC ceramic materials by using calcium oxide / alumina / silicon dioxide / lithium oxide glass solder relates to a method for connecting SiC ceramic materials by using glass solder. The invention aims to solve the technical problems that the connection of SiC ceramics needs high temperature and high pressure conditions under the service condition of the current nuclear reactor, and the joint performance and radiation resistance are poor. The invention is beneficial to improving the mechanical properties of the joint, and at the same time can improve the reliability of the SiC ceramic welded structural parts in the nuclear irradiation service environment, so that the welded structure is expected to be used in the field of nuclear power. The glass solder connection method of the present invention is simple to use, and can realize connection under no pressure, atmosphere and relatively lower connection temperature of 1200°C to 1280°C. In the welding thermal cycle, the solder can form a glass with high crystallization rate in situ Ceramic welds can significantly improve the mechanical properties and radiation resistance of joints.

Description

technical field [0001] The invention relates to a method for connecting SiC ceramic materials using glass solder. Background technique [0002] Nuclear power safety is the first element of nuclear energy development. In order to improve the safety and reliability of nuclear reactors, increase the safety factor of the core, increase the melting point of the core, increase the fuel consumption, reduce the pollutants in the primary circuit, reduce the radiation dose of the core to the staff, extend the The reactor lifetime puts forward a more urgent requirement for the development of cladding materials with accident containment margin. [0003] SiC ceramics and their composites (SiCf / SiC) are known for their high melting point, smaller neutron absorption cross section, low decay heat, high thermal conductivity, high temperature stability, high mechanical strength, excellent radiation dimensional stability and corrosion resistance And other advantages, it has become a promising...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B37/00C03C3/062
CPCC04B37/003C03C3/062
Inventor 张杰方健刘春凤孙良博郭松松单提鹏文粤
Owner HARBIN INST OF TECH