CVD/CVI processes and Chemical treatments

MPA Industrie is mastering fundamentals of CVD/CVI with a large range expertise

The advent of chemical vapour deposition started in the years 70’s with the development of the transistor technology and hard coating for metal cutting/forming.

Lots of customized applications has been developed for customers in many sectors. MPA Industrie has a 30-year-old experience in the field of the Chemical Vapour Deposition (CVD) solutions, CVD processes and fabrication of customized CVD reactors. Since its founding, our company works only in this field (Thermal CVD, CVI, Fluidized Bed Reactor and Specials Furnaces).

WHAT IS CHEMICAL VAPOR DEPOSITION (CVD)  OR INFILTRATION  (CVI)?

By using pure gases, CVD can  obtain pure materials with the relevant properties.

CVD technique combines several scientific and engineering disciplines

CVD is a process of formation of a non-volatile solid film on a substrate from the reaction of vapor phase chemical reactants containing the right proportion of constituents and depending of:

• Chemical Reactions
• Reactor Type and Geometry
• Process parameters (Temperature, Pressure, Flow rate and time)                             
• Transport phenomena  (Mass and Heat)
• Kinetics and Thermodynamics

ELEMETRY STEPS IN A CVD REACTOR :

• Introduction of reactive species into a reactor
• Diffusion and Adsorption of the reactants onto the surface
• Reaction at the surface to form the solid
• Desorption of by products from the surface
• Diffusion of  by products and un-reacted  reactants away from the surface and transport of by products out of the reactor

Each step required to master special engineering.

In parallel MPA Industrie proposes:

• Fluoride Ion Cleaning process (FIC):
  Most of high temperature alloys used in aircraft engine are aluminized.

During repair phases of components like turbine blades, diffusers, the first operation is to remove aluminum layer by a high temperature treatment under hydrogen fluoride atmosphere.

In the other hand MPA Industrie provided doped aluminizing CVD system on high temperature aircraft engine components like thrust, turbine blade…

The great expertise of MPA Industrie with the handling of hazardous gas makes system very safe and reliable.