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Diffusion bonding method for graphite, low carbon steel and stainless steel

A diffusion connection and low-carbon steel technology, which is applied in the diffusion connection of graphite and low-carbon steel, stainless steel, and the connection between inorganic non-metallic materials and metals, to achieve the effect of promoting diffusion bonding, stable and reliable performance, and easy promotion and application

Inactive Publication Date: 2015-01-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, quasicrystals are mainly used for surface modification materials and structural material reinforcement phases, and there is no precedent for using quasicrystal foils for diffusion bonding of graphite and steel

Method used

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  • Diffusion bonding method for graphite, low carbon steel and stainless steel
  • Diffusion bonding method for graphite, low carbon steel and stainless steel

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Diffusion connection of graphite with a length of 60mm, a width of 40mm, and a thickness of 20mm and Q235 low-carbon steel of the same size, the connection surface is 60mm×40mm contact surface. A quasi-crystalline titanium-copper foil with a thickness of 30 μm is used as the middle layer. The process steps are:

[0024] (1) Wipe the surface of the graphite to be connected with alcohol to remove oil stains and sundries on the surface; use a hydrochloric acid solution with a concentration of 15% to remove the rust on the surface of the Q235 low carbon steel to be connected.

[0025] (2) Use quasi-crystalline titanium copper metal foil with a purity greater than 99% as the active intermediate layer, and the chemical composition (by mass percentage) of the quasi-crystalline titanium copper metal foil is: Cu8.5%, C0.06%, Fe0.20 %, Si0.8%, the rest is Ti.

[0026] (3) Place the quasicrystalline titanium copper metal foil between the high-strength graphite and the low-carbon...

Embodiment 2

[0034] Diffusion connection of flake graphite with a diameter of 50mm and a thickness of 30mm and Cr18-Ni8 stainless steel of the same size, the connection surface is a circular contact surface with a diameter of 50mm. A quasi-crystalline titanium-copper foil with a thickness of 50 μm is used as the middle layer. The process steps are:

[0035] (1) Machining the graphite and Cr18-Ni8 stainless steel to be connected is smooth, and the Cr18-Ni8 stainless steel is polished with sandpaper until the metallic luster is exposed.

[0036] (2) Use quasi-crystalline titanium copper metal foil with a purity greater than 99% as the active intermediate layer. The chemical composition (by mass percentage) of the quasi-crystalline titanium copper metal foil is: C0.08%, Fe0.22%, Si0.8 %, the remainder is Ti.

[0037] (3) Place the disc-shaped quasicrystalline titanium-copper metal foil between the graphite and the Cr18-Ni8 stainless steel surface to be connected, stack and assemble the disc...

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Abstract

The invention discloses a diffusion bonding method for graphite, low carbon steel and stainless steel. The method mainly comprises the steps of placing a quasi-crystal titanium copper metal foil between to-be-welded contact interfaces of the graphite, the low carbon steel and the stainless steel; performing vacuum diffusion on the quasi-crystal titanium copper metal foil, wherein according to the process parameters, the temperature rise rate of the heating process is 3-10 DEG C / min, the holding time of the temperatures of 480 DEG C and 680 DEG C is 8-10 min, the bonding temperature is 800-880 DEG C, the holding time of the temperature is 20-45 min, the bonding pressure is 10-30MPa, the vacuum degree is 1.33*10<-5>-1.44*10<-4>Pa, the bonding temperature of the cooling process is 600DEG C while the cooling rate is 5-8 DEG C / min, and the bonding temperature is smaller than 600 DEG C while the cooling rate is 8-10 DEG C / min. The method is capable of improving the strength performance of a diffusion welding head and has the advantages of simple process, convenient operation, popularization and application, and the like.

Description

technical field [0001] The invention relates to the connection of inorganic non-metallic materials and metals, in particular to the diffusion connection of graphite and low-carbon steel and stainless steel, and belongs to the field of welding technology. Background technique [0002] Graphite has the characteristics of excellent corrosion resistance, high temperature resistance and high compressive strength, and is widely used in petrochemical, electric power, metallurgy and other industrial fields, such as flanges, valves, reactors, generators, electrodes, brushes, etc. . In some mechanical equipment, graphite is used as wear-resistant and lubricating material, which can slide at a speed of 100m / s in the temperature range of -200-2000°C, without or less lubricating oil. Graphite can also be used as a neutron moderator for nuclear reactors, nozzles for rockets, nose cones for missiles, aerospace equipment components, heat insulation materials, radiation protection materials...

Claims

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Application Information

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IPC IPC(8): B23K20/14B23K20/16
CPCB23K20/14B23K20/16
Inventor 李亚江王娟张永兰
Owner SHANDONG UNIV
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