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GT defines optimum dynamic surface finish for HVOF coated surfaces
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Greene Tweed & Co Benelux BV
: 04 August, 2004 (New Product) |
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Critical needs drive important and innovative research. Organizations involved in the aerospace industry have been searching for a replacement to the traditional chrome coating process used in dynamic aircraft systems. |
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The traditional process produces carcinogenic hexavalent chrome molecules; therefore, alternative coating processes have been evaluated to replace hard chrome. These coatings, known as high velocity oxygen fueled, deliver superior wear, fatigue and impact resistance over chrome, while reducing environmental and health risks typically associated with hard chrome plating.
The use of HVOF coatings in dynamic applications has required an evaluation of the surfaces with respect to their interaction with seals and bearings. Traditional hard chrome surfaces tend to polish over time by the motion of seals and bearings traveling over the surface. HVOF surfaces, however, do not polish and remain in their original condition over many years and dynamic cycles in service. Therefore, having an improper HVOF surface finish design can lead to negative system performance throughout the life of the system. As a result of extensive testing, Greene, Tweed, partnering with many prominent aerospace organizations and the bi-national HCAT (hard chrome alternative team), has identified several surface finish parameters that are critical to successful utilization of HVOF surfaces with seals and bearings.
'Through our engineering expertise and research we have developed vital information about the performance of seals and bearings for use in dynamic systems that utilize HVOF coatings. By defining the critical surface finish parameters of HVOF coatings needed to promote long life and efficient performance of dynamic seals we are able to provide value to our partners and the industry,' noted John Mergenthaler, vice president and general manager of Greene, Tweed's aerospace business. |
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