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Thermo-Reactive Diffusion (TRD) Process / TD Coatings

At TeikuroTRD, we provide superior service on every part regardless of your company’s size. Our TRD process uses a vanadium carbide layer measuring .0001 to .0008 inches thick with a hardness of 3,200 to 3,800 Vickers that greatly increases the life of forming and shearing tools used under severe working conditions.

Learn more about the TRD Process:

Applications the Use the TRD Process

Application of TRD Process to Sheet Metal Stamping Dies

The application of TRD process to sheet metal stamping dies provides a significant industrial merit caused by the improved performance of the dies.  Therefore, TRD Process is practically employed in the wide range of stamping field in several countries including Japan. Learn more about Application Techniques Of TRD Process Mainly To Large Sheet Metal Stamping Dies.

Salt Bath Process Comparison with CVD, PCVD and PVD

There are four kinds of thin hard coating processes that are being used worldwide to improve life of cutting tools, dies and molds, and machine components.  There are CVD, PCVD, PVD, and TD process.  Both the CVD and TD process started their wide application in Japan in advance of any other industrial countries including Germany where the CVD process was born.  The PVD process came later.  The largest current application overall is presumably being made by PVD because of it’s low temperature process. Read about Salt Bath TD Process in Comparison With CVD, PCVD, and PVD.

 

Principle of the TRD process

Atoms or ions of carbide constituents dispersed in the salt bath combined with C atoms contained in the substrate; then the carbide layer is formed on the surface of the substrate. Thereafter, the layer is expanded by reaction between C and the carbide constituent on the formed carbide layer and continuous supply of C atoms from the substrate.

 

Characteristics of TRD Process

  1. TRD coating is foamed  over the surface  with hardening of substrate simultaneously.
  2. Reprocess can be easily conducted ( up to 8 times in some cases)
  3. Coating layer is always uniform with consistent quality.
  4. High process compatibility to various tool steel, structural steel and others.
  5. Coating thickness can be controlled.

Method of TRD Process

The carbide layer is formed by immersing dies or parts in to a fused salt bath set in and electric furnace as shown in TRD Furnace within the range from 1850°F to 1925°F for 4 to 16 hours: All dies and parts are take out from TRD salt bath for further hardening and tempering. Basic process flow is showing in TRD Process.

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Basic Teikuro TRD Procedures

Hardness

TRD process produces Vanadium Carbide coating which has extremely high hardness.

Comparision of Surface hardness at High Temperature

Wear - Resistance

Vanadium Carbide provides remarkable wear-resistance against any material such as steel, plastics, rubber and so on.

 
 

Friction Resistance

 
 
 
 
 

Spalling Resistance

 
 
An overview of our Thermal Diffusion (TD) coating process and TRD Thermo Reactive DiffusionServicesApplications for using TD (thermal difussion) coatings to extend tool life

Specific application data, detailing the process and benefits of particular uses for the TRD process.

Materials

Summary of recommended materials based on mechanical or thermal usage. 

Industries Served

Teikuro’s TRD coating process can be used in virtually any industries where tooling problems occur.