公开(公告)号：DE3470569D1

公开(公告)日：1988-05-26

申请号：DE3470569

申请日：1984-07-06

Applicant: UNITED TECHNOLOGIES CORP

Inventor： RASHID JAMES MARK ,  FRELING MELVIN ,  FRIEDRICH LEONARD ALBERT

IPC: C23C12/02 ,  C23C12/00 ,  C23C10/40 ,  C23C8/70 ,  B32B15/01

Abstract: Chromium boron diffusion coatings on nickel iron alloys uniquely provide them with improvement in high cycle fatigue strength (up to 30%) and erosion resistance (up to 15 times), compared to uncoated alloy. The diffused chromium layer extends in two essential concentration zones to a total depth of about40 x 10 -6 m while the succeeding boron layer is limited to 50-90% of the depth of the richest Cr layer nearest the surface. Both coatings are applied using conventional pack diffusion processes.