Accession Number : ADA262749


Title :   Boron Carbide Aluminum Cermets for External Pressure Housing Applications


Descriptive Note : Final rept. for FY1991


Corporate Author : NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA


Personal Author(s) : Stachiw, J D ; Pyzik, A ; Carroll, D ; Prunier, A ; Allen, T


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262749.pdf


Report Date : Sep 1992


Pagination or Media Count : 152


Abstract : B4C/Al ceramic composites have been found to be excellent candidates for pressure housing applications for use in deep submergence underwater vehicles. These materials have the compressive strengths of a ceramic material but a lower weight/displacement ratio and can be produced in near-net shape. A methodology has been developed in The Dow Chemical Company to form large parts of this material. Nine B4C/Al cylinders with 6-inch diameters and lengths of up to 9 inches were produced in the first phase of the program for development of pressure housing for underwater vehicles. The pressure housing tests showed that the compressive strength of this material in the form of 6-inch diameter by 5- inch-long cylinders was in excess of 300 kpsi. The weight to displacement of cylinders equipped with titanium joint rings for 9000-psi service with safety factor of 2.2 was found to be 0.365, a 27-percent improvement over alumina cylinders with identical dimensions and safety factors. When B4C/Al cylinders are compared to titanium alloy Ti6Al4Va cylinders for 9000-psi service with identical safety factor, the titanium cylinders are found to be 256 percent heavier.


Descriptors :   *ALUMINUM , *BORON CARBIDES , *HOUSINGS , *CERMETS , TEST AND EVALUATION , DIAMETERS , METHODOLOGY , RATIOS , UNDERWATER VEHICLES , MATERIALS , PRESSURE , DEEP SUBMERGENCE , TITANIUM ALLOYS , SAFETY FACTOR , COMPRESSIVE STRENGTH , RINGS , EXTERNAL , PARTS , WEIGHT , COMPOSITE MATERIALS , DISPLACEMENT , ALLOYS , PHASE , CERAMIC MATERIALS


Subject Categories : Ceramics, Refractories and Glass
      Metallurgy and Metallography
      Submarine Engineering


Distribution Statement : APPROVED FOR PUBLIC RELEASE