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Synthesis of hard nano-structured metal matrix composite boride coatings using combined laser and sol-gel technology

Choudhury, AR; Ezz, T; Li, Lin

Materials Science and Engineering A. 2007;445-446:193-207.

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Abstract

This paper reports the synthesis of nano-structured boride metal matrix composite (MMC) coatings obtained by laser melting of a pre-placed mixture of B4C + Ti-6Al-4V powders and sol-gel derived nano-particulate Ti(OH)(4). The resulting nano-composite coatings have been characterised in terms of microhardness, microstructure and constituent phase composition. The coatings show evidence of micro-level FeB phases and nanoparticulate TiB phases in a (Fe + Fe2B) matrix. One form of the nano-particulate TiB phase is formed in situ as rosettes as a result of dendritic bending while the other form is of irregular shape. The wear resistance of the hardest coating has been tested at 30 mm/s sliding speed and normal loads of 10, 20, 30 and 40 N under dry conditions. The wear resistance of the coating material shows a 17-fold increase compared to that of the EN43 steel substrate material and comparable or better than most reported work. Reduction of Ti-6Al-4V content in the pre-placed powder mixture does not substantially affect the hardness and wear resistance of the coating.

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http://www.sciencedirect.com/science/journal/09215093
Volume:
445-446
Start page:
193
End page:
207
Total:
15
Pagination:
193-207
Related website(s):
  • Related website http://portal.isiknowledge.com/portal.cgi?DestApp=WOS&Func=Frame
Access state:
Active

Record metadata

Manchester eScholar ID:
uk-ac-man-scw:1e313
Created:
17th September, 2009, 21:33:59
Last modified:
18th August, 2015, 12:52:41

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