Accession Number : ADA140435

Title :   Materials Research for Advanced Inertial Instrumentation. Task 2. Gas Bearing Material Development.

Descriptive Note : Final rept. 1 Oct 77-31 Dec 83,

Corporate Author : CHARLES STARK DRAPER LAB INC CAMBRIDGE MA

Personal Author(s) : Kumar,K ; Newborn,H ; Das,D

PDF Url : ADA140435

Report Date : Feb 1984

Pagination or Media Count : 92

Abstract : The gas bearing materials research program was pursued with the aim of producing novel materials, with new technologies, for applicability to advanced inertial instrument designs. The objective was to produce low friction, high wear-resistance, high integrity gas bearing surfaces that were integrated within a beryllium structure. It was required that these surfaces not be limited in performance by factors known to influence existing hardware, such as porosity, adhesion, and nonconformity in physical properties to the several structural components. Three approaches were selected to achieve the desired gas bearing surface. These included investigating reactive-diffusion bonded CVD-boron films on beryllium, boron-ion implanted beryllium surfaces, and the Be-TiB2 metal matrix composites. CVD-boron deposition on beryllium was found to proceed well in a high vacuum, bakeable, all stainless chamber. The successful procedure involved thermal decomposition of diborane on a beryllium sample surface which was heated by RF induction to about 700 to 800 C. Boron-ion implantation was performed on specially prepared beryllium surfaces, using a high current machine, up to boron concentrations of well over 50 atom percent. The Be-TiB2 composites were produced by hot isostatic pressing (HIP) of blended and cold compacted beryllium and titanium diboride powders.

Descriptors :   *Inertial systems, *Beryllium, Gas bearings, Composite materials, Boron, Ion implantation, Vapor deposition, Diffusion, Matrix materials, Ceramic materials, Isostatic pressing, Friction, Wear resistance, Hardness, Thermal expansion, Thermal conductivity, Adhesion, Porosity, Structural analysis, Reliability, Costs

Subject Categories : Laminates and Composite Materials
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE