Functional Coatings Laboratory

CHEMICAL VAPOUR DEPOSITION (CVD)

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Archer’s Technicoat VA0204 CVD System is a fully automatic and compact laboratory design chemical vapor deposition system that is used for aluminide coating researches. The machine and process control system is based upon an Omron PLC for all digital, control, and analog functions. Certain safety requirements are hard-wired into the PLC ensuring maximum security. Fail-Safe shutdown scenarios are programmed into the PLC in the event of system failures such as power failures, cooling water outages, loss of compressed air, supply gas failure, and gas leak detection. Coatings are applied in a hot-wall vertical tube furnace (1200 ˚C max.) or a hot-wall horizontal tube furnace (1500 C max.). System consist of two different external chlorination generator can be used for aluminum deposition or alloying – reactive element co-deposition. In addition, internal graphite trays can be used for metal addition by way of evaporating their chlorides. Hydrogen Chloride (HCl) gas is used to form metal chlorides at external generator and products are carried to coating retort by Argon as a carrier gas. Aluminizing process can be operated in a pressure between 20 – 200 mbar.

 


HEAT TREATMENT FURNACE

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In MiDAS HT Furnace-100 system, heat treatment is carried out in furnace chamber under vacuum atmosphere. The furnace is made of stainless steel (SAE304) having dimensions of 60 cm x 60 cm x 60 cm. There are 3 different vacuum pumps all of which are mechanic, root and diffusion pump. The level of vacuum is below 10 -5 Torr. Heating is done in an enclosed chamber placed in the middle of furnace chamber. The heaters are Lanthanum doped Molybdenum wires . The substrate is placed on sample holder and it is elevated up to the heating champer.Maximum operation temperature is 1315 0 C. The cooling of chamber is made by stainless water channels having water flow inside. The cooling of substrate in the chamber can be made by furnace cooling, air cooling or accelerated argon cooling. Also, nitrogen or oxygen may be fed into the system if desired.


SIMULATION PROGRAMS

1

THERMOCALC

It is a powerful software package for the calculation of thermodynamic and phase equilibria. In conjunction with suitable thermodynamic databases, assessed using the CALPHAD approach, Thermo-Calc can be used for a wide variety of applications. Using THERMOCALC you can make calculations for:

  • Stable and meta-stable heterogeneous phase equilibria
  • Amounts of phases and their compositions
  • Thermochemical data such as enthalpies, heat capacity and activities
  • Transformation temperatures, such as liquidus and solidus
  • Driving force for phase transformations
  • Phase diagrams (binary, ternary and multi-component)
  • Solidification applying the Scheil-Gulliver model
  • Thermodynamic properties of chemical reactions
  • And much, much more…

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DICTRA

It is a unique add-on module to Thermo-Calc for the accurate simulation of diffusion controlled reactions in multicomponent alloy systems. DICTRA is based on the numerical solution of the multicomponent diffusion equations and the CALPHAD approach. Using DICTRA you can make calculations for:

  • Microsegregation during solidification
  • Homogenization of alloys
  • Growth/dissolution of carbides, nitrides and intermetallic phases
  • Coarsening of precipitate phases
  • Interdiffusion in compounds, e.g. coating systems
  • Austenite to ferrite transformations in steel
  • Carburization, nitriding and carbonitriding of high-temperature alloys and steels
  • Post weld heat treatment
  • Sintering of cemented-carbides

3

TC PRISMA

It is an add-on software package to Thermo-Calc which treats concurrent nucleation, growth/dissolution and coarsening under arbitrary heat treatment conditions in multicomponent and multi-phase systems using Langer-Schwartz theory and the Kampmann-Wagner numerical approach. Using TC PRISMA you can make calculations for:

  • Concurrent nucleation, growth/dissolution and coarsening of precipitates
  • Temporal evolution of particle size distribution
  • Average particle radius and number density
  • Volume fraction and composition of precipitate
  • Nucleation rate and coarsening rate
  • Time-Temperature-Precipitation (TTP) diagrams
  • Estimation of multi-component interfacial energy

5

JMAT PRO

It is a simulation software which calculates a wide range of materials properties for alloys and is particularly aimed at multi-components alloys used in industrial practice. Using JMatPro you can make calculations for:

  • Stable and metastable phase equilibrium
  • Solidification behaviour and properties
  • Mechanical properties
  • Thermo-physical and physical properties
  • Phase transformations
  • Chemical properties