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Connecting solder and its preparation method, silicon carbide cladding connection method

A connection method and a technology of silicon carbide, applied in fuel elements, reduction of greenhouse gases, nuclear power generation, etc., can solve the problems of insufficient air tightness, increased difficulty in assembling cladding tubes and end plugs, etc., and achieve good wettability, Improve the structural strength and integrity, improve the effect of safety

Active Publication Date: 2021-08-27
CHINA NUCLEAR POWER TECH RES INST CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if the thickness of the connecting layer is too thin, it will increase the difficulty of assembling the cladding tube and the end plug, and the problem of insufficient airtightness will easily occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1. Preparation:

[0057] Using polycarbosilane (PCS) and glass powder CA (C=CaO, A=Al 2 o 3 ) as a raw material; where CA was obtained by water quenching and grinding after holding at 1650°C for 2h. Mix PCS and CA uniformly at a mass ratio of 95:5, and mix the mixed powder with xylene to form a connecting solder with a solid content of 50 wt%. The connecting brazing material is applied between the cladding tube and the end plug to form the components to be connected, and the components to be connected are cured at 300 °C precursor, and then cracked at a cracking temperature of 1200 °C and a cracking pressure of 1 MPa, and finally after 1500 °C ℃ subsequent heat treatment for 2h to obtain the silicon carbide cladding.

[0058] 2. Performance test:

[0059] The thickness of the connecting layer formed by the connecting solder is 50μm, the shear strength at room temperature is 100MPa, the high temperature shear strength at 1200°C is 110MPa, and the leakage rate is 0.5×...

Embodiment 2

[0061] 1. Preparation:

[0062] Using polycarbosilane (PCS) and glass powder CA (C=CaO, A=Al 2 o 3 ) as a raw material; wherein the glass powder CA is obtained by water quenching and grinding after holding at 1700°C for 2h. Mix PCS and CA uniformly at a mass ratio of 98:2, mix the mixed powder with xylene to form a connecting solder with a solid content of 60wt%, and coat the connecting solder between the cladding tube and the end plug to form a To connect the components, the components to be connected are cured at 250°C precursor, then cracked at a cracking temperature of 1100°C and a cracking pressure of 0.1MPa, and finally undergo a subsequent heat treatment at 1350°C for 1 hour to obtain a silicon carbide cladding.

[0063] 2. Performance test:

[0064] The thickness of the connecting layer formed by the connecting solder is 100μm, the shear strength at room temperature is 60MPa, the high temperature shear strength at 1200°C is 80MPa, and the leakage rate is 0.8×10-9Pa·...

Embodiment 3

[0066] 1. Preparation:

[0067] Using polycarbosilane (PCS) and glass powder SAY (S=SiO 2 , A=Al 2 o 3 , Y=Y 2 o 3 ) as a raw material; wherein the glass powder SAY is obtained by water quenching and grinding after being kept at 1700°C for 2h. Mix PCS and CA uniformly at a mass ratio of 90:10, mix the mixed powder with xylene to form a connecting solder with a solid content of 30wt%, and coat the connecting solder between the cladding tube and the end plug to form a To connect the components, the components to be connected are cured at 280°C precursor, and then cracked at a cracking temperature of 1150°C and a cracking pressure of 0.5MPa, and finally undergo a subsequent heat treatment at 1500°C for 0.5h to obtain a silicon carbide cladding.

[0068] 2. Performance test:

[0069] The thickness of the connecting layer formed by the connecting solder is 60μm, the shear strength at room temperature is 55MPa, the high temperature shear strength at 1200°C is 70MPa, and the le...

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Abstract

The invention discloses a connecting solder and its preparation method, and a silicon carbide cladding connecting method. The connecting solder includes the following raw materials: a precursor, a glass powder and an organic solvent; the mass ratio of the precursor to the glass powder is 90 ~98:2~10. The connecting solder of the present invention is used for the connection of silicon carbide cladding, wherein the glass additive phase formed by the glass powder has good wettability with silicon carbide, and the connection strength is high; the proportion of the glass powder is adjustable, so that the glass additive phase The thermal expansion coefficient is adjustable, and the stress of the joint after connection is controllable; a thicker dense connection layer can be realized, which is beneficial to engineering assembly and has better air tightness.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel, in particular to a connecting solder and a preparation method thereof, and a silicon carbide cladding connecting method. Background technique [0002] Silicon carbide (SiC) ceramics have the characteristics of high strength, high hardness, low density, oxidation resistance, and corrosion resistance. In addition, they also have excellent properties such as small thermal expansion coefficient, high thermal conductivity, good high temperature performance, and low neutron absorption cross section. It is widely used in nuclear applications such as cladding fuel elements, inner walls of nuclear reactor vessels, and inner reactor piping linings. [0003] The cladding is mainly composed of cladding tubes and end plug connections, which serve in high temperature, high pressure, high radiation and hydrothermal corrosion environments. Since SiC is a strong covalent bond compound with a high melting po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B37/00G21C3/06
CPCC04B37/003G21C3/06C04B2237/083C04B2237/08C04B2237/368C04B2237/365Y02E30/30G21C3/07C04B37/005C04B2235/6562C04B2237/765C04B2237/708
Inventor 薛佳祥廖业宏任啟森刘彤翟剑晗马海滨张显生张永栋李锐刘洋
Owner CHINA NUCLEAR POWER TECH RES INST CO LTD
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