Wear Resistant Coatings for Aluminum and Titanium Alloy Housings and Flanges

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-06-M-5034
Agency Tracking Number: F061-096-3832
Amount: $99,967.00
Phase: Phase I
Program: SBIR
Awards Year: 2006
Solicitation Year: 2006
Solicitation Topic Code: AF06-096
Solicitation Number: 2006.1
Small Business Information
6F Gill Street, Woburn, MA, 01801
DUNS: 114584175
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Hongwei Song
 Staff Scientist
 (781) 935-2800
 hwsong@bostonati.com
Business Contact
 Kevin Zou
Title: Vice President
Phone: (781) 935-2800
Email: kzou@bostonati.com
Research Institution
N/A
Abstract
Aluminum and titanium alloys have become more widely used for bearing housings and flanges in aerospace propulsion systems because of their low density, high strength-to-weight ratio, and high thermal conductivity. However, their wear resistance and corrosion resistance are poor. When matched to harder steel surfaces under adverse vibrations, loads, and temperature cycling, they can experience a significant fretting wear. Currently, steel inserts or bushings are employed to solve the fretting wear of aluminum alloy components. However, such approach increases a number of manufactured parts and decreases the strength-to-weight ratio of the entire mechanisms. The mismatches of thermal and mechanical properties at the interface will largely affect the functionality of whole housing and flange system. Boston Applied Technologies Incorporated (BATI) proposes to develop an innovative wear resistant, hard coating to replace the steel inserts and bushings. The proposed coatings are grown from aluminum or titanium alloy substrates utilizing the microarc-discharge oxidation followed spraying process. The coatings will have a thickness of up to 200 µm and unique cross-sectional microstructure and phase composition. The inner layer metallurgically binds with substrate alloys and thus exhibits high adhesion strength, and the outer layer exhibits low fraction coefficient and good wear resistant in contact with steel, and also good corrosion resistance. The proposed approach does not affect the bulk mechanical characteristics of bearing housing and flange systems, and yet at a low-cost.

* Information listed above is at the time of submission. *

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