Materials Research for Advanced Inertial Instrumentation. Task 2. Gas Bearing Material Development by Surface Modification of Beryllium.
Abstract
The purpose of this program is to produce an adherent, low friction and wear resistant coating on a beryllium surface by in-situ formation of boride or borides of beryllium, with this goal being pursued via two distinct avenues of approach, i.e., diffusion, and ion implantation. This report covers a period of roughly one year since October 1978. In the portion of the work which features diffusion from a solid boron source, it is now determined that the cause of earlier failures in producing bonded boride to beryllium substrates was due to formation of an oxide layer at the interface. Other significant accomplishments in the study of reactive diffusion process during this period are: (1) Thin (about 1 micrometer) and uniform films of as yet unidentified hard beryllium borides have been produced by chemical vapor deposition which are highly adherent with a strong potential for high wear resistance as indicated by its resistance to conventional polishing procedures, (2) Developed a successful technique of producing well bonded Be-B diffusion couples by hot isostatic pressing, (3) Produced solid gamma boron by Arc Plasma Spraying suitable for fabrication Be-gamma B diffusion couples, which is not available otherwise. For the process of boriding by ion implantation, the feasibility of attaining very high (40 and 60 a/o) boron concentrations in the near-surface of beryllium has been demonstrated. Sample format and procedures have been devised which will provide the largest amount of information for the least investment of time in the ion implantation equipment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1979
- Accession Number
- ADA084780
Entities
People
- Debanik Das
- E. Wettstein
- J. Wollam
- K. Kumar
Organizations
- Charles Stark Draper Laboratory