GTV PTWA CoATinG

GTV PTWA Coating
The technical standard in automotive industry
has been new defined
KS Kolbenschmidt AG
GTV PTWA Coating
The PTWA (Plasma Transferred Wire Arc) spray technology is used in industrial applications for economical replacement of cast iron liners, which are pressed or casted as cylinder sleeve into aluminum cast engine blocks.
KS Kolbenschmidt AG
The by FORD developed PTWA technology is a wire based, rotating spray process which combines a twín arc spray process
and an atmospheric plasma spray process.
Characteristics of PTWA coatings for engine blocks:
▪▪ Weight reduction
▪▪ Improved efficiency of engines due to defined
porosity coatings that provide an additional
retention oil volume, especially in the highly
loaded areas of top and bottom dead centers
▪▪ Reduced friction power
▪▪ Improved heat transfer from the cylinder wall
into the cooling water circuit, cylinder surface
temperature is reduced by up to 30°C
▪▪ Accordingly higher compression ratios can be
realized without occurrence of glow ignition
Mechanically roughened
surface: Dove tail profile
Honed surface of a PTWA
coating (SEM)
Also the remanufacturing industry of engine blocks
spray repairs worn cylinder bores as another application for the PTWA technology. A non automotive application is the internal coating of rotary symmetric parts
e.g. tubes. Suitable inner diameters range between
min. 65 and max. 120 mm.
Users of PTWA Systems / Coatings
▪▪ Nissan
▪▪ Caterpillar
▪▪ Autocraft for Ford
▪▪ Martinrea Honsel for Ford
▪▪ Volkswagen
▪▪ KS Kolbenschmdt for Porsche
▪▪ PSA
Cut aluminium Ford SIGMA block, bore holes Ford Shelby Mustang V8,
5.4L, 550HP/410kW; 690 Nm
from right to left: Mechanically roughened,
PTWA sprayed, pre honed, finish honed (D10)
Setup of the PTWA R&D
equipment at GTV
Ford Shelby Mustang V8 block
production spraying at Martinrea
Honsel, Meschede, Germany
PTWA: Plasma Wire Transfer Arc
Wire
molten
particles
Plasma
gas
Cathode (-)
Nozzle (+)
Atomizing
gas
Using high frequency ignition an electric arc is ignited
generating 60 to 150 Amps. The wire is molten by the
arc as well as by the argon / hydrogen plasma. The
molten wire tip is atomized and droplets are accelerated
towards the substrate (bore hole wall) by compressed
air. This leads to solidification of the particles on the
prepared surface (mechanical roughened) and formation
of lamellar coatings with defined porosity.
Turn Key System at GTV for the Aluminium Cylinder Bore
Coating of Patrol and Diesel Engines
Ever since the company was established in
1982, the name GTV has stood for top quality
and a high level of delivery reliability for all
types of thermal spray products.
GTV provides its customers with many years
of experience in all aspects of the hightechnology field of thermal spray technology,
enabling them to make use of the effective
and efficient GTV system solutions in order to
gain a substantial competitive advantage in
the market.
GTV GmbH
Gewerbegebiet „Vor der Neuwiese“, D-57629 Luckenbach, Germany
Phone: +49 (0)2662 95 76-0, Fax: +49 (0)2662 95 76-30
E-Mail: [email protected], Internet: www.gtv-mbh.de