Author: B. A. WilcoxPublisher:
ISBN:
Category : Tantalum
Languages : en
Pages : 32
Book Description
The Effect of Concurrent Stressing on the Air Oxidation of Tantalum
Author: B. A. WilcoxPublisher:
ISBN:
Category : Tantalum
Languages : en
Pages : 32
Book Description
The Effect of Concurrent Stressing on the Air Oxidation of Tantalum
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
The air oxidation of unstressed tantalum, measured by decrease in metal thickness over the temperature range 427 to 649 C (800 to 1200 F) was found to proceed initially according to a parabolic rate law. At temperatures of 510 to 649 C (950 to 1200 F) the oxidation changed from parabolic to linear behavior, after times at temperature sufficient to allow breakdown of the protective initial oxide scale. The transition time from parabolic to linear oxidation decreased with increasing temperature. Linear and parabolic rate constants were evaluated for the scaling process. Activation energies of 28,600 cal/mol for linear oxidation, and of 40,800 cal/mol for parabolic oxidation were determined. Oxidation tests in the stressed condition, (20,000 and 24,000 psi) increased the parabolic scaling rate about two to four times over than of unstressed samples at the same temperature. No enhancement of the linear oxidation rate was noted. (Author).
The Effect of Concurrent Stressing on the Air Oxidation of Tantalum
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
The air oxidation of unstressed tantalum, measured by decrease in metal thickness over the temperature range 427 to 649 C (800 to 1200 F) was found to proceed initially according to a parabolic rate law. At temperatures of 510 to 649 C (950 to 1200 F) the oxidation changed from parabolic to linear behavior, after times at temperature sufficient to allow breakdown of the protective initial oxide scale. The transition time from parabolic to linear oxidation decreased with increasing temperature. Linear and parabolic rate constants were evaluated for the scaling process. Activation energies of 28,600 cal/mol for linear oxidation, and of 40,800 cal/mol for parabolic oxidation were determined. Oxidation tests in the stressed condition, (20,000 and 24,000 psi) increased the parabolic scaling rate about two to four times over than of unstressed samples at the same temperature. No enhancement of the linear oxidation rate was noted. (Author).
A Review of the Air Force Materials Research and Development Program
Author: United States. Wright Air Development DivisionPublisher:
ISBN:
Category : Materials
Languages : en
Pages : 276
Book Description
A review of the research and development work sponsored in the field of materials and processes over the past decade is presented. Abstracts of WADC Technical Reports for the period 1 July 1951 to 30 June 1953 are included. A summary of Technical Reports published in the areas of metallurgy, textiles, petroleum products, structural materials, rubbers, plastics, packaging, protective treatments, analysis and measurements are included also.
A Review of the Air Force Materials Research and Development Program
Author: Donna J. TatePublisher:
ISBN:
Category : Materials
Languages : en
Pages : 262
Book Description
These reports cover basic and applied research in the materials area being conducted by the Metals and Ceramics, Non-metallic Materials, Physics, Manufacturing Technology and Applications Laboratories of the Directorate of Materials and Processes.
U.S. Government Research Reports
Author: Corrosion by Liquid Metals
Author: J. E. DraleyPublisher: Springer Science & Business Media
ISBN: 1468418459
Category : Science
Languages : en
Pages : 603
Book Description
The Corrosion Resistant Metals Committee and the Nuclear Metallurgy Committee of the Institute of Metals Division of The Metallurgical Society of AlME sponsored a 2-1/2 day symposium on "Corrosion by Liquid Metals". The symposium was held in Philadelphia, October 13-15, 1969, during the 1969 Fall Meeting of the Metallurgical Society and the Materials Engineering Con gress of the American Society for Metals. Cosponsors included the American Society for Metals and the American Nuclear Society. The purpose of the symposium was to bring together the several aspects of the subject of corrosion by liquid metals, so that perspective could be provided on the entire subject, to help in dividuals dealing with liquid metal corrosion problems acquire a sound basis of understanding, and to provide an opportunity for discussion between those doing research in this field. An exposition of the subject is timely, in view of the in creasing development of liquid metal heat and power sources for special purposes, including heat-pipe systems, NASA's SNAP power systems, and the AEC's liquid metal fast breeder reactor system. This book contains the proceedings of the symposium divided into four separate topics: I. Corrosion of Steels by Sodium, II. Alkali-Refractory Metal Interactions, III. Corrosion by Non-Alkali Metals, and IV. Analysis of Solid-Liquid Metal Inter actions (two sessions).
Charles J. Cleary Awards for Papers on Material Sciences
Author: Library of Congress. Science and Technology DivisionPublisher:
ISBN:
Category : Materials
Languages : en
Pages : 234
Book Description
Author: 
Author: