A fusion reactor high thermal load multilayer composite tube and its manufacturing method

Abstract

The invention belongs to the cooling technology of fusion reactor components, and specifically discloses a fusion reactor high heat load multilayer composite pipe and its manufacturing method. The inner pipe is made of stainless steel pipe, the middle pipe is made of copper pipe, and the outer pipe is made of alloy or ceramics. , first clean the copper tube, use tungsten alloy to prepare the outer tube, clean the inner stainless steel tube and then cold-roll the copper tube and stainless steel tube, then assemble the tungsten alloy tube, put the assembled three-layer composite tube in a vacuum furnace, tungsten alloy Tubes & Copper Tubes are Vacuum Brazed, Stainless Steel Tubes & Copper Tubes are Vacuum Diffusion Welded. The axisymmetric cold extrusion process can ensure uniform residual compressive stress between the copper tube and the steel tube, and the vacuum diffusion welding can ensure 100% connection. The tungsten & copper vacuum brazing and stainless steel & copper vacuum diffusion welding are performed together. While saving a lot of cost, it avoids the impact of high temperature of tungsten-copper brazing on stainless steel copper brazing joints, and the filamentary filler metal is more practical than the strip-shaped solder.

Description

technical field

[0001] The invention belongs to the technical field of fusion reactor component cooling, and in particular relates to a multilayer composite tube and a manufacturing method. Background technique

[0002] A large number of components composed of stainless steel, copper and tungsten alloys interconnected in fusion devices are used to withstand high thermal loads and harsh neutron irradiation environments. After testing, it was found that the traditional three-layer structure of stainless steel, copper alloy and tungsten alloy adopts two vacuum brazing processes of stainless steel and copper alloy + copper alloy and tungsten alloy. Vacuum brazing of tungsten alloy and copper alloy is often easy The performance of the vacuum brazed joint is affected, and the safe and stable operation of the heat exchange components of the fusion device cannot be guaranteed. Contents of the invention

[0003] The object of the present invention is to provide a fusion reactor hi...

Examples

Embodiment 1

[0087] Example 1: 316LN stainless steel tube + T2 pure copper + W alloy functional parts (tungsten alloy tube)

[0088] 1. Select a T2 M state pure copper rod with a diameter of φ40mm and a length of 500mm, and use a high-precision deep hole drill to process a deep hole of φ10.2*500mm in the center of the copper rod.

[0089] 2. Select 316LN stainless steel pipe with φ10mm*2 length of 1000mm. The roundness tolerance of the stainless steel pipe shall not exceed 0.02mm, and the straightness tolerance of the stainless steel pipe shall not exceed 0.01mm / 100mm.

[0090] 3. Use 10% nitric acid to pickle the inner and outer surfaces of copper pipes and stainless steel pipes.

[0091] 4. Assemble the copper tube and the stainless steel tube assembly together (the copper tube is outside), and seal the gap at both ends with glass glue, select a mandrel with a diameter smaller than the inner diameter of the stainless steel tube, and control the gap between the mandrel and the inner diame...

Embodiment 2

[0106] Example 2: 316LN stainless steel tube + T2 M state pure copper heat conduction components

[0107] 1. Select a 60*100*300mm T2 M-state pure copper block, and use a high-precision deep hole drill to process a φ10*500mm deep hole in the center of the copper block. The smoothness of the copper inner hole shall not be higher than Ra3.2, the roundness tolerance of the copper inner hole shall not exceed 0.02mm, and the straightness tolerance of the copper inner hole shall not exceed 0.01mm / 100mm.

[0108] 2. Use wire cutting to cut out a 0.8-1.2mm high, 1.6-2mm long, and 300mm deep square groove from the inner wall outwards in the inner hole of the copper block for inserting 2-3 wire-like welding wires.

[0109] 3. Select 316LN stainless steel pipe with φ10*2mm and 500mm in length. The roundness tolerance of the stainless steel pipe shall not exceed 0.02mm, and the straightness tolerance of the stainless steel pipe shall not exceed 0.01mm / 100mm. The roughness of the outer wa...

technical field

[0001] The invention belongs to the technical field of fusion reactor component cooling, and in particular relates to a multilayer composite tube and a manufacturing method. Background technique

[0002] A large number of components composed of stainless steel, copper and tungsten alloys interconnected in fusion devices are used to withstand high thermal loads and harsh neutron irradiation environments. After testing, it was found that the traditional three-layer structure of stainless steel, copper alloy and tungsten alloy adopts two vacuum brazing processes of stainless steel and copper alloy + copper alloy and tungsten alloy. Vacuum brazing of tungsten alloy and copper alloy is often easy The performance of the vacuum brazed joint is affected, and the safe and stable operation of the heat exchange components of the fusion device cannot be guaranteed. Contents of the invention

[0003] The object of the present invention is to provide a fusion reactor hi...

Examples

Embodiment 1

[0087] Example 1: 316LN stainless steel tube + T2 pure copper + W alloy functional parts (tungsten alloy tube)

[0088] 1. Select a T2 M state pure copper rod with a diameter of φ40mm and a length of 500mm, and use a high-precision deep hole drill to process a deep hole of φ10.2*500mm in the center of the copper rod.

[0089] 2. Select 316LN stainless steel pipe with φ10mm*2 length of 1000mm. The roundness tolerance of the stainless steel pipe shall not exceed 0.02mm, and the straightness tolerance of the stainless steel pipe shall not exceed 0.01mm / 100mm.

[0090] 3. Use 10% nitric acid to pickle the inner and outer surfaces of copper pipes and stainless steel pipes.

[0091] 4. Assemble the copper tube and the stainless steel tube assembly together (the copper tube is outside), and seal the gap at both ends with glass glue, select a mandrel with a diameter smaller than the inner diameter of the stainless steel tube, and control the gap between the mandrel and the inner diame...

Embodiment 2

[0106] Example 2: 316LN stainless steel tube + T2 M state pure copper heat conduction components

[0107] 1. Select a 60*100*300mm T2 M-state pure copper block, and use a high-precision deep hole drill to process a φ10*500mm deep hole in the center of the copper block. The smoothness of the copper inner hole shall not be higher than Ra3.2, the roundness tolerance of the copper inner hole shall not exceed 0.02mm, and the straightness tolerance of the copper inner hole shall not exceed 0.01mm / 100mm.

[0108] 2. Use wire cutting to cut out a 0.8-1.2mm high, 1.6-2mm long, and 300mm deep square groove from the inner wall outwards in the inner hole of the copper block for inserting 2-3 wire-like welding wires.

[0109] 3. Select 316LN stainless steel pipe with φ10*2mm and 500mm in length. The roundness tolerance of the stainless steel pipe shall not exceed 0.02mm, and the straightness tolerance of the stainless steel pipe shall not exceed 0.01mm / 100mm. The roughness of the outer wa...