The CENTRICOTE Advantage: Enhancing Performance and Lifespan in Metallurgical Applications

Toyomet launched a new range of coatings for producing cylinder

liners by the centrifugal casting process. Centrifugal casting uses

centripetal force to distribute the molten metal in a mold, typically metered

into the mold or die. Proponents recommend the process for

producing castings with high material soundness — cylinder liners,

for example.

The CENTRICOTE coatings were specially developed by Toyomet

to influence the cast surface texture of a cylinder liner so that it can

be cast directly into an aluminum cylinder block without the need for

external machining.

“When casting around a gray iron cylinder liner, it is essential that an

intimate physical bond is created between aluminum and iron

after solidification,” Toyomet notes, “as the creation of voids will lead

to poor thermal transfer and the risk of slight movements in

operation, reducing the life expectancy of the block.

“Through the use of CENTRICOTE coating and the associated

application technology, surface textures can be created that minimize

the creation of voids regardless of the aluminum casting technology,”

Other advantages credited to the new coating include:

• The refractory filler is highly resistant to the high temperature of the liquid iron and has good insulating properties;
• The coating has optimal drying properties when applied to the hot die, without spalling or the formation of craters or blisters, ensuring the cast surface is free from pin-holes, blemishes, or entrapped coating-material;
• Excellent releasing properties help to avoid problems during the removal of the cylinder liners from the die. The release properties are not only important for productivity but also for extending the in-service life of the die.