公开(公告)号：CA1223780A

公开(公告)日：1987-07-07

申请号：CA457555

申请日：1984-06-27

Applicant: UNITED TECHNOLOGIES CORP

Inventor： RASHID JAMES M ,  FRIEDRICH LEONARD A ,  FRELING MELVIN

IPC: C23C12/02 ,  C23C12/00 ,  C23C10/54

Abstract: Chromium Boron Surfaced Nickel-Iron Base Alloys 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 about 40 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.