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Vacuum brazing technique of stainless steel plate fin structure

A technology of stainless steel plate and brazing process, applied in manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of many structural defects and low strength, improve reliability, ensure brazing quality, and optimize vacuum brazing The effect of craftsmanship

Inactive Publication Date: 2010-08-11
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is aimed at the disadvantages of many structural defects and low strength obtained in the prior art. On the basis of a large number of vacuum brazing, strength, microstructure observation and other tests, a suitable stainless steel plate is proposed. Vacuum brazing process of fin structure

Method used

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  • Vacuum brazing technique of stainless steel plate fin structure
  • Vacuum brazing technique of stainless steel plate fin structure
  • Vacuum brazing technique of stainless steel plate fin structure

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: A stainless steel plate fin structure, composed of fins (1), partitions (2), seals (3) and so on. The material of the fin and the partition is 304 stainless steel, the thickness of the fin is 0.2mm, and the thickness of the partition is 0.4mm. The solder uses nickel-based solder BNi2 with a thickness of 105μm. First put a fin on the partition (metal plate), and then put a partition on it. A solder foil is pre-installed between the fin and the partition, and then both sides are sealed with edge seals to form a basic unit (such as Shown in Figure 1). After stacking a lot of basic units and clamping them firmly with a special brazing fixture designed by the inventor, the applied pressure is 5MPa, put into a vacuum brazing furnace, and a stainless steel plate-fin structure is made by vacuum brazing.

[0019] The vacuum brazing heating process consists of the following six steps:

[0020] The first step is the vacuum stage: the vacuum degree is 1×10 -3 Pa. Its p...

Embodiment 2

[0027] Embodiment 2: A stainless steel plate fin structure, consisting of fins (1), partitions (2), seals (3) and so on. The material of the fin and the partition is 304 stainless steel, the thickness of the fin is 0.2mm, and the thickness of the partition is 0.4mm. The solder uses nickel-based solder BNi2, and the thickness of the solder is 110μm. First put a fin on the partition (metal plate), and then put a partition on it. A solder foil is pre-installed between the fin and the partition, and then both sides are sealed with edge seals to form a basic unit (such as Shown in Figure 1). After stacking a lot of basic units and clamping them firmly with a special brazing fixture designed by the inventor, the applied pressure is 5MPa, put into a vacuum brazing furnace, and a stainless steel plate-fin structure is made by vacuum brazing.

[0028] The vacuum brazing heating process consists of the following six steps:

[0029] The first step is the vacuum stage: the vacuum degree is ...

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Abstract

The invention discloses a vacuum brazing process of a stainless steel plate-fin structure, comprising: firstly placing a fin on a baffle and then placing a baffle thereon, placing a solder foil between the fin and the baffles, and then sealing the two sides by edge sealing tapes to form an elementary unit; stacking up a plurality of elementary units according to the design requirements, then using a special jig to clamp and firm the units and exerting pressure on the units, and placing the units in a vacuum brazing furnace; vacuumizing the brazing furnace firstly; then heating the stainless steel plate-fin structure to 850 to 870DEG C and then preserving the heat; and again heating the stainless steel plate-fin structure to the brazing temperature of 1070 to 1100DEG C and then preserving the heat; and then self-cooling the structure slowly in vacuum from the brazing temperature of 1070 to 1100DEG C to 620 to 640DEG C, then filling nitrogen into the furnace, starting up a fan to cool the structure to 40 to 60DEG C so as to take out the structure, and finally obtaining the stainless steel plate-fin structure. The stainless steel plate-fin structure acquired through the brazing process has excellent microstructures and rather high strength.

Description

Technical field [0001] The invention relates to a vacuum brazing process of a stainless steel plate and fin structure, belonging to the field of high temperature resistant stainless steel plate and fin heat exchangers. Background technique [0002] The stainless steel plate-fin structure is the core component of the stainless steel plate-fin heat exchanger, which is brazed by fins, partitions and seals. A metal flat plate (separator) is placed on each of the upper and lower ends of the fin, and a brazing material foil is preset between the partition, the fin and the seal. The melting point of the solder is lower than that of the base material, and the solder alloy melts at the brazing temperature to weld the fins, partitions and seals into a whole. It has the characteristics of high thermal conductivity, small size, light weight, high temperature resistance, and high strength. It is used in high temperature and high pressure environments, such as gas turbines and high temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008
Inventor 蒋文春巩建鸣涂善东
Owner NANJING TECH UNIV
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