Process for producing wear resistant coatings for engine components
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United States of America Patent
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Jan 7, 1992
Issued Date -
N/A
app pub date -
Mar 22, 1991
filing date -
Nov 9, 1988
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Abstract
Engine components of steel or superalloy subject to wear from alternating friction at medium temperatures in the region of 700.degree. C. are provided with a protective wear-resistant coating by a) electrophoretic deposition of a metal-ceramic structure comprising a mixture of from 85% to 50% of metallic powder and from 15% to 59% of ceramic powder, the metallic powder being a cobalt-based superalloy of type KC 25 NW or of M Cr Al Y wherein M represents at least one metal chosen from the group consisting of Ni, Co and Fe with the possible addition of Ta, and the ceramic powder being an oxide such as Al.sub.2 O.sub.3 or Cr.sub.2 O.sub.3, a carbide such as SiC or Cr.sub.3 C.sub.2, a nitride such as BN or TiN, or a boride such as TiB.sub.2 ; b) electrolytic pre-nickeling said deposit in an electrolysis bath at a pH between 6 and 8, and c) electrolytic nickeling said pre-nickeled deposit in an acid bath of sulphamate type. A further step of stress-relieving the nickeled deposit may be carried out at a temperature below 700.degree. C.
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