Method of non oxidation of pneumatic joint material

Date:19-11-09

Generally, the material of pneumatic joint is directly brazed by stainless steel in vacuum furnace, such as vacuum degree lower than 10 ℃, or in hydrogen furnace, such as hydrogen dew point higher than 60 ℃, stainless steel will be oxidized. In order to reduce the requirement of vacuum degree or hydrogen dew point, it is necessary to electroplate nickel layer on the surface of stainless steel and then braze, but the phenomenon of blistering and wrinkling of nickel layer often occurs. So, how to prevent the material of pneumatic joint from being oxidized?

Generally, the material of pneumatic joint is directly brazed by stainless steel in vacuum furnace, such as vacuum degree lower than 10 ℃, or in hydrogen furnace, such as hydrogen dew point higher than 60 ℃, stainless steel will be oxidized. In order to reduce the requirement of vacuum degree or hydrogen dew point, it is necessary to electroplate nickel layer on the surface of stainless steel and then braze, but the phenomenon of blistering and wrinkling of nickel layer often occurs. So, how to prevent the material of pneumatic joint from being oxidized?
In order to overcome these disadvantages, as long as the brazing surface of stainless steel parts is coated with a layer of Qingao (nickel plating is not required on the surface of stainless steel), it can be brazed in a general vacuum furnace, i.e. under a vacuum degree of 4 × 10 "'~ 10" 5. The brazing seam can work at low temperature (i.e. 260 ℃), with good air tightness. This method is used to braze stainless steel and stainless steel, stainless steel and oxygen-free copper and other parts, with high tensile strength.

One of the strengthening methods of stainless steel is to refine the grains. Because the grain size has a great influence on the strength, the finer the grains, the higher the yield strength of the steel Using the feature that chinke can be used as "deoxidizer", a layer of chinke paste is coated on the brazed surface of stainless steel to make chinke enter the steel, and the brazing is heated up in a vacuum furnace with 4 XIO "'tuo ~ 10" 5 Tuo.
Directly on the surface of the brazed part, apply the Fuqin paste by hand, then mount the Ag Cu solder on the rack, put it into the vacuum furnace of 4x10 cradle ~ 10 ", and the tensile strength is up to 1990 ~ 2500kg / cm2 after the temperature rise of 830 ℃.

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