Stainless steel low-temperature powder-embedded iron-aluminum co-infiltration agent and embedding infiltration process method

Abstract

The invention discloses a stainless steel low-temperature powder embedding iron-aluminum co-cementation agent and a pack-cementation process method. The stainless steel low-temperature powder embedding iron-aluminum co-cementation agent is characterized in that aluminum powder is taken as main an aluminum supplying agent, iron powder is a main iron supplying agent, iron-aluminum powder is taken as active filler to replace the conventional inactive ceramic powder filler, aluminum trichloride is taken as an activating agent, and a small amount of rare earth chloride can be added to be used as a catalyst; and a process comprises the following steps of: completely and uniformly mixing the cementation agent, then putting the cementation agent and a stainless steel sample to be subjected to iron-aluminum copermeation processing into a cementation tank, mixing sodium silicate with fire clay, carrying out sealing and drying, so as to obtain an iron-aluminum compound alloy layer with the certain thickness, wherein the alumetizing temperature is 380-600 DEG C, and the temperature is kept for 10 or more than 10 hours. The stainless steel low-temperature powder embedding iron-aluminum co-cementation agent has the advantages that the process method is simple, devices required for low-temperature embedding iron-aluminum co-cementation are simple, the cost is low, the aluminum content of the surface of the obtained iron-aluminum compound alloy layer is high, the iron-aluminum compound alloy layer has a very strong binding force with a matrix and good intermediate temperate oxidation resistance and corrosion resistance and can well protect the matrix.

Description

technical field [0001] The invention relates to a stainless steel low-temperature powder-embedded iron-aluminum co-infiltration agent and an embedding infiltration process method. Background technique [0002] Stainless steel blades are the compressor steel turbine rotor blades with the largest number of applications in aero-engines. Their working conditions are surrounded by high-temperature gas, and they not only bear the centrifugal force, aerodynamic force, thermal stress and vibration stress of the blade itself when the turbine rotor rotates at high speed. It is the part with the worst working conditions inside the engine, and the erosion, oxidation and corrosion of high-temperature gas are the main reasons for blade damage. In order to effectively reduce the damage to stainless steel blades due to the above reasons, metal aluminum elements are purposely infiltrated to form an iron-aluminum compound alloy layer with high aluminum content on the surface of stainless stee...

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Problems solved by technology

Although the patent document "a low-temperature powder-embedded aluminizing agent for petroleum oil and casing (CN101165204A)" can form an aluminized layer on the surface of a workpiece to be aluminized under low temperature conditions, the obtained aluminized layer contains zinc element, the aluminized layer shows a step change, the aluminized layer contains low aluminum content, and the outermost layer has the lowest aluminum content

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