Author: Clark F. Grain
Publisher:
ISBN:
Category : Oxides
Languages : en
Pages : 30
Book Description
Thermal Expansion and Phase Inversion of Six Refractory Oxides
Author: Clark F. Grain
Publisher:
ISBN:
Category : Oxides
Languages : en
Pages : 30
Book Description
Publisher:
ISBN:
Category : Oxides
Languages : en
Pages : 30
Book Description
Stockpile Report to the Congress
Author:
Publisher:
ISBN:
Category : Strategic materials
Languages : en
Pages : 376
Book Description
Publisher:
ISBN:
Category : Strategic materials
Languages : en
Pages : 376
Book Description
Report to the President by the Director of Defense Mobilization
Author: United States. Office of Defense Mobilization
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 914
Book Description
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 914
Book Description
Stockpile Report to the Congress
Author: United States. Office of Emergency Planning
Publisher:
ISBN:
Category : Strategic materials
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category : Strategic materials
Languages : en
Pages :
Book Description
Technical Publications Announcements with Indexes
Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1318
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1318
Book Description
Guide to Annual Subject Index for Technical Publications Announcements, Apr.-Dec. 1962
Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 720
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 720
Book Description
Investigation of Thermal Shock Resistance of Zirconia with Metal Additions
Author: Alan Arias
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 88
Book Description
Zirconium oxide or Zirconia has a melting point of about 27000, is resistant to chemical attack by acids and bases, is very stable at high temperatures in oxidizing atmospheres, and is inert when in contact with most metals at high temperatures. In addition, zirconia is relatively inexpensive and abundant. These characteristics of zirconia would make it a very satisfactory material for many high-temperature applications, were it not for the fact that pure zirconia undergoes an allotropic transformation from tetragonal to monoclinic on cooling through a temperature range in the neighborhood of 900 C. This transformation takes place with a volume increase of about 3 percent. During the reverse transformation near 11000 C on heating, zirconia shrinks by about the same amount. The large anisotropic volume changes associated with the transformation cause bodies made from pure zirconia to disintegrate during their manufacture or when in use. In practice, this difficulty is circumvented by adding small amounts of certain Oxides, such as calcia, magnesia, yttria, etc., to zirconia. Depending on the kind and amount of oxide added to the zirconia, the high-temperature crystal structure of the combination is totally or partially retained on cooling, and the allotropic transformation is also totally or partially suppressed. This so-called stabilized zirconia performs satisfactorily in many high-temperature applications, but the addition of stabilizing oxides also introduces some undesirable features, such as an increase in the thermal-expansion coefficient, a lowering of the melting point, and, for some types of stabilized zirconia, a tendency to disintegrate on prolonged thermal cycling. A zirconia-base material combining the high-temperature properties of pure zirconia without the disadvantages associated with the use of stabilizers would be highly desirable.
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 88
Book Description
Zirconium oxide or Zirconia has a melting point of about 27000, is resistant to chemical attack by acids and bases, is very stable at high temperatures in oxidizing atmospheres, and is inert when in contact with most metals at high temperatures. In addition, zirconia is relatively inexpensive and abundant. These characteristics of zirconia would make it a very satisfactory material for many high-temperature applications, were it not for the fact that pure zirconia undergoes an allotropic transformation from tetragonal to monoclinic on cooling through a temperature range in the neighborhood of 900 C. This transformation takes place with a volume increase of about 3 percent. During the reverse transformation near 11000 C on heating, zirconia shrinks by about the same amount. The large anisotropic volume changes associated with the transformation cause bodies made from pure zirconia to disintegrate during their manufacture or when in use. In practice, this difficulty is circumvented by adding small amounts of certain Oxides, such as calcia, magnesia, yttria, etc., to zirconia. Depending on the kind and amount of oxide added to the zirconia, the high-temperature crystal structure of the combination is totally or partially retained on cooling, and the allotropic transformation is also totally or partially suppressed. This so-called stabilized zirconia performs satisfactorily in many high-temperature applications, but the addition of stabilizing oxides also introduces some undesirable features, such as an increase in the thermal-expansion coefficient, a lowering of the melting point, and, for some types of stabilized zirconia, a tendency to disintegrate on prolonged thermal cycling. A zirconia-base material combining the high-temperature properties of pure zirconia without the disadvantages associated with the use of stabilizers would be highly desirable.
Heats and Free Energies of Formation of Gallium Sesquioxide and Scandium Sesquioxide
Author: Alla D. Mah
Publisher:
ISBN:
Category : Aluminum oxide
Languages : en
Pages : 394
Book Description
Publisher:
ISBN:
Category : Aluminum oxide
Languages : en
Pages : 394
Book Description
Report of Investigations
Author:
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ISBN:
Category : Mineral industries
Languages : en
Pages : 682
Book Description
Publisher:
ISBN:
Category : Mineral industries
Languages : en
Pages : 682
Book Description
Methods for Producing Alumina from Clay
Author: Andrew A. Cochran
Publisher:
ISBN:
Category : Alaska, Gulf of (Alaska)
Languages : en
Pages : 556
Book Description
Publisher:
ISBN:
Category : Alaska, Gulf of (Alaska)
Languages : en
Pages : 556
Book Description