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were extended to include shot peening, anodising, painting and NDT.
The expertise built up over 50 years made Hycrome a foremost specialist in application of hard chrome, sulphamate nickel plate
and electroless nickel plate, and their fine finished tolerances.
In 1990 Hycrome became a wholly owned subsidiary of Score Group plc, a global organisation specialising in valve, actuator, and
gas turbine solutions. In 1997 Hycrome relocated its 3-acre site and 63,000 sq ft purpose built factory. Our state of the art
facility is among the largest in the UK and serves industries as diverse as Aerospace, Mining, Pharmaceutical, Offshore Oil &
Gas, Power Generation, Textile and Valve Manufacturing.
ABOUT HYCROME
3
HIGH VELOCITY OXYGEN FUELLED (HVOF)
The HVOF (High Velocity Oxy-Fuel) process efficiently uses high kinetic energy and controlled
thermal output to produce dense, low porosity coatings that exhibit high bond strengths,
low oxides and extremely fine as-sprayed finishes. The coatings have low residual internal
stresses and therefore can be sprayed to a thickness not normally associated with dense,
thermal sprayed coatings.
Particularly suited to the application of high quality tungsten carbide coatings.
PLASMA
Plasma Spray is perhaps the most flexible of all of the thermal spray processes as it can develop
sufficient energy to melt any material. Since it uses powder as the coating feedstock,
the number of coating materials that can be used in the plasma spray process is almost
unlimited.
A high frequency arc is ignited between an anode (nozzle) and a cathode (electrode). Process
gases (generally mixtures of argon and helium) flowing between them is ionized to become a
plume of hot plasma gas which are calculated to give temperatures in a range of 6,600 °C
to 16,600 °C (12,000 °F to 30,000 °F). When the coating material is injected into the
gas plume, it is instantly melted and propelled towards the target substrate.
Standard coatings applied by plasma include, but are not limited to;
Chrome Oxide
Alumina Oxide
Turco Alkaline
Molybdenum
Thermal Barrier Coatings (TBC)
Chemical Etch
Abradable
ABRADABLE COATING
An abradable coating is a coating made of an abradable material – meaning if it rubs against a
more abrasive material in motion, the former will be worn whereas the latter will face no wear.
Thus producing a seal between parts, when required.
Abradable coatings are used in aircraft jet engines in the compressor and turbine sections
where a minimal clearance is needed between the blade tips and the casing.
In typical turbo machinery, the clearance between blade tips and the casing must account for
thermal expansion as well as changes in concentricity due to shock loading events. To prevent
catastrophic tip to casing contact, conservatively large clearances must be employed.
The role of abradable coatings is not only to allow for closer clearances, but to automatically
adjust clearances, in-situ, to accept physical events and/or thermal scenarios that may be
found in a devices operational history.
THERMAL COATING
45 TYP
0.020”
0.090” -0.090”
0.7578” DIA REF
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Due to the intense operating conditions that the engines
are put through, a complete overhaul and repair service
for the gas generators is provided, including where necessary,
lease engines/ service exchange support. All repair
activity schemes are carried out in our extensive workshop
that has the latest overhaul facilities, overseen by our highly
experienced team of inspectors, with the Gas Turbine Engines being tested and
scrutinised at Score Energy Wellbank site, Scotland.
Heavy Investments have been made in the most up to date tooling and
measuring equipment to ensure each task is done correctly. To prolong the life of
the Turbine Engines protective treatments and special coatings are applied.
PRIMARY CLEANING AND
SURFACE PREPARATION
Kerosine wash
Trico hot vapour
Turco Alkaline
ND – 150 water based solution
Acid Pickling
Chemical Etch
Abrasive Blasting
Vacu-Blasting
Glass and Plastic Bead
INSPECTION PROCESSING
Magnetic Particle Inspection
Penetrant Flaw Detection
Hardness testing
Ultrasonic wall thickness Inspection
High Precision Co-ordinate
Measuring Machine
Acid Etch Inspection
REPAIRS AND PROTECTIVE
TREATMENTS
Alocrom
Copper Plating
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