Appliance Design - October 2008 - (Page 37)

COATINGS Fig. 2. Performance data on salt spray testing results for corrosion. Fig. 3. Steps required for electroceramic coating process versus traditional coating processes. choices are required, electroceramic coating technology is compatible with most typical powder paint finishes. The coating provides an excellent base for paints, adhesives, sealants, and thermal spray coatings, and dramatically improves the adhesion of sprayapplied materials. Traditional cleaning and shot blast preparation are not required prior to thermal spray application. Fig.1 shows the appearance of the coating on a range of different parts and components. In electroceramic coating, an electrolytic process deposits a specially formulated ceramic layer onto the surface of a metal substrate. The thickness of this layer ranges from 3 to 15 microns of transition metal oxide using the titanium analog as the focus. The coating has a hardness of 637 to 800 Vickers, as tested with a nano-indenter, yet is extremely flexible. The coating’s roughness is less than 0.07 microns with a coefficient of friction of 0.2, resulting in a smooth finished surface. When a metal substrate is coated with an electroceramic coating, the surface resists abrasion and provides increased wear resistance. (Tested to 2,000 Taber cycles, C-17 Wheel, with no wearwww.applianceDESIGN.com through on a coating thickness of 12 microns.) Unlike traditional finish coatings, electroceramic coating is highly flexible and exhibits a pass rating for flexibility of 1-2 T bend, per the ASTM D 4145 test method. In addition, the electroceramic coating will coat the metal substrate in any area that is wet with the chemistry, so that internal passageways, crevices and holes can benefit from the coating technology as well as exteriors. Electroceramic coating is stable at extremely high temperatures up to 900 DegC, well beyond the melting temperature of aluminum. In applications where thermal resistance is critical, electroceramic coating will remain intact during thermal events where substrates themselves may fail, as can be experienced in pumps, compressors, and engines. The mechanical, chemical, and life cycle requirements of the finished appliance dictate the substrates selected for use in an assembly. Designers, engineers, and process professionals go to great lengths to select the appropriate material for the end use environment and the forces that are experienced by the appliance. Both the material’s cost and its appropriateness for an application strongly factor into substrate selection. For parts such as pumps, valves, tanks and hoses, chosen substrates have included stainless steel, brass and certain plastics that resist chemical wear and corrosion. Stainless steel, however, is more expensive than aluminized steel. Cast brass costs more than aluminum. And plastics prices have been on the rise, as they are closely tied to the petroleum market. With new electroceramic coating technology, engineers can colors • textures special effects functionality color consulting & technical service 2nd generation bonded metallics large or small volumes custom colors, fast global partnership …any questions? colorworksforyou www.tiger-coatings.com 800.243.8148 applianceDESIGN October 2008 37 7/14/08 11:08:51 AM AD08084Tige.indd 1 http://www.tiger-coatings.com http://www.tiger-coatings.com http://www.applianceDESIGN.com

Table of Contents Feed for the Digital Edition of Appliance Design - October 2008

Appliance Design - October 2008 Contents Editorial Shipments/Forecasts News Watch Prototyping - Materials Play the Part Prototyping - Mix & Match Motors Electronics Coatings Design Marts Association Report: AHRI Advertiser's Index

Appliance Design - October 2008

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