Regeneration of turbine and aero engine components as well as surface coating with metallic and ceramic materials.
OT Oberflächentechnik GmbH & Co. KG
Schwerin (Werkstraße 4 and 115) · 19061 SchwerinNew on Amplifa
Company profile
OT Oberflächentechnik GmbH & Co. KG (OT Schwerin) was founded in Schwerin in 1993 and specializes in the complete regeneration of service-exposed components from stationary gas and steam turbines, civil aero engines and compressor systems. The service portfolio comprises chemical, mechanical and electrochemical stripping, cleaning and salt bath cleaning, heat treatment, non-destructive testing, laser wire and laser powder welding, machining and metallography. In addition, the company coats new parts with metallic and ceramic materials, including diffusion coating (chromizing/aluminizing) and thermal spraying (HVOF). The materials processed are predominantly high-temperature materials. A mobile coating service renews coatings on blade wheels, rotors and casing parts directly on site at power plants and workshops in Europe, the Middle East, Southeast Asia, South America and Australia/New Zealand. The Schwerin site (Werkstraße 4 and 115) offers around 18,000 m² of production space; approximately 120 employees are employed. Reference customers include Siemens Energy, MAN Energy Solutions, GE Gas Power, Ansaldo Energia and MTU Aero Engines.
- Site
- Schwerin
- Processes
- Diffusion coating (CVD) / chromizing / aluminizing, Thermal spraying (HVOF), Atmospheric spraying, Chemical stripping with acids, Electrochemical stripping (ECM), Mechanical stripping (residual layer grinding), Pickling, Salt bath cleaning
- Materials
- High-temperature materials, Metallic materials (coating), Ceramic materials (coating), Metal-ceramic coatings, Diffusion coating (chromizing/aluminizing), Thermal spraying (HVOF), Laser powder welding / laser hardening
- Certificates
- DIN EN ISO 9001, DIN EN 9100 (aviation), Nadcap (welding), DIN ISO 3834-2, EN 1090-2, ISO 9001, EN 9100, EN 1090, Other (Nadcap welding, DIN ISO 3834-2)
- Founded
- 1993
- Employees
- approx. 120
- Industries
- Power plant engineering (stationary gas and steam turbines), Aviation (civil aero engines), Compressor systems, Power generation
- 01
Stripping (chemical, electrochemical, mechanical)
- 02
Cleaning/salt bath cleaning
- 03
Heat treatment
- 04
Repair welding (laser wire, laser powder)
- 05
Machining/recontouring
- 06
Surface coating (CVD, HVOF)
- 07
Testing (NDT, metallography, airflow measurement)
Materials and processes
High-temperature materials
Base material for turbine and aero engine components in regeneration and coating.
Diffusion coating (chromizing/aluminizing)
Diffusion coating process for corrosion protection of hot gas components.
Thermal spraying (HVOF)
Application of metallic and ceramic coatings to increase component service life.
Ceramic materials (coating)
Ceramic layers for use at high temperatures.
Metallic materials (coating)
Metallic coatings, also metal-ceramic systems for mobile on-site coating.
Laser powder welding / laser hardening
Repair welding and local heat treatment on high-temperature components.
Site
Schwerin
DEProduction and administration (Werkstraße 4 and 115)
- Materials
- High-temperature materials, metallic and ceramic coating materials
- Diffusion coating system (chromizing/aluminizing)
- Hybrid thermal spraying coating system
- 2 vacuum furnaces
- 2 laser wire welding systems
- Laser powder welding system
- Chromizing furnace
- Pyrolysis furnace (burn-out furnace)
- Baking furnace
- Bogie hearth furnace
- Open blast cabinets
- Shot peening system
- Coating system for compressor blades, shafts and turbine components
- Waterjet cutting system
- Highly efficient cooling system for heat treatment
- Mobile coating systems with bell furnace technology
Components and services
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Diffusion coating (CVD) / chromizing / aluminizingSurface | – | – | – | – | High-temperature materials, metallic materials, ceramic materials |
| Thermal spraying (HVOF)Surface | – | – | – | – | metallic materials, ceramic materials |
| Atmospheric sprayingSurface | – | – | – | – | metallic materials |
| Chemical stripping with acidsSurface | – | – | – | – | – |
| Electrochemical stripping (ECM)Surface | – | – | – | – | – |
| Mechanical stripping (residual layer grinding)Surface | – | – | – | – | – |
| PicklingSurface | – | – | – | – | – |
| Salt bath cleaningSurface | – | – | – | – | – |
| Cleaning blasting / open blast blasting / shot peeningSurface | – | – | – | – | Turbine and compressor components |
| Heat treatment (vacuum furnace, bogie hearth furnace, pyrolysis furnace, baking furnace, bellHeat treatment | – | – | – | – | High-temperature materials |
| Laser wire weldingJoining | – | – | – | – | High-temperature materials, metallic materials |
| Laser powder weldingJoining | – | – | – | – | High-temperature materials |
| Welding (Nadcap accredited, DIN ISO 3834-2, EN 1090-2)Joining | – | – | – | – | metallic materials |
| Laser hardening (LPW system expanded)Heat treatment | – | – | – | – | – |
| Waterjet cuttingMachining | – | – | – | – | – |
| Machining / recontouring of repair welds to drawingMachining | – | – | – | – | – |
| MetallographyTesting | – | – | – | – | – |
| Non-destructive testing (NDT) / surface crack testingTesting | – | – | – | – | – |
| Airflow measurementTesting | – | – | – | – | – |
| Mobile coating service (renewal of metal-ceramic coatings on blade wheels,Surface | – | – | – | – | metal-ceramic coatings, stationary gas turbine components |
| Thermal degreasing in the mobile furnaceHeat treatment | – | – | – | – | – |
| Hot compressor coating of shafts / compressor coating of large partsSurface | – | – | – | – | – |
16 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Diffusion coating system (chromizing/aluminizing) | – | 1 | – | 2001 | Schwerin |
| Coating system (hybrid) thermal spraying | – | 1 | – | 2007 | Schwerin |
| Vacuum furnace (heat treatment) | – | 2 | – | – | Schwerin |
| Laser wire welding system | – | 2 | – | 2010/2018 | Schwerin |
| Laser powder welding system | – | 1 | – | 2012 | Schwerin |
| Chromizing furnace | – | 1 | – | 2015 (erne | Schwerin |
| Pyrolysis furnace (burn-out furnace) | – | 1 | – | 2015 | Schwerin |
| Baking furnace | – | 1 | – | 2015 (erne | Schwerin |
| Mobile bell furnace | – | 1 | – | 2015 | mobile |
| Bogie hearth furnace | – | 1 | – | 2013 | Schwerin |
| Open blast cabinet | – | – | – | 2013 | Schwerin |
| Shot peening system | – | 1 | – | 2018 | Schwerin |
| Coating system for compressor blades, shafts and turbine components | – | 1 | – | 2018 | Schwerin |
| Waterjet cutting system | – | 1 | – | 2013 | Schwerin |
| Highly efficient cooling system for heat treatment | – | 1 | – | 2021 | Schwerin |
| Mobile coating systems (with bell furnace technology) | – | – | – | – | mobile worldwide |
Additional services
Reference customers
Quality and certifications
The quality management system of OT Schwerin ensures that processes and procedures are regularly reviewed and improved. The company is certified to DIN EN ISO 9001 and DIN EN 9100 (aviation) as well as accredited to DIN ISO 3834-2 and EN 1090-2 (welding, DVS ZERT) and Nadcap (welding).
| Evidence | Schwerin |
|---|---|
| ISO 9001 | |
| EN 9100 | |
| EN 1090 | |
| Other (Nadcap welding, DIN ISO 3834-2) |
History
- 1993
Founding of OT Oberflächentechnik GmbH Schwerin with a focus on chemical stripping with acids
- 1999
Expansion of production space at Werkstraße 115
- 2001
Investment in a diffusion coating system for chromizing/aluminizing
- 2007
Investment in a hybrid thermal spraying coating system
- 2010
Expansion of repair capacity for GT regeneration of rear hot gas stages; second vacuum furnace; introduction of laser wire welding
- 2012
Expansion of the repair portfolio with a laser powder welding system
- 2013
Expansion of repair variety: GT regeneration of front hot gas stages, airflow measurement, waterjet cutting, mechanical stripping, compressor coating of large parts
- 2014
Project start qualification of electrochemical stripping (ECM)
- 2015
Capacity expansion of chemical stripping; production area for hot coating of compressor shafts
- 2016
Extension building for chemical stripping production area with offices and chemical laboratory
- 2018
Modernization and expansion of the aviation production area; second laser wire welding system
- 2021
First certification to the aviation standard DIN EN 9100
- 2022
First Nadcap accreditation (welding)