Effect of Porosity on Physical Properties of Sintered Alumina

Porous structures having a continuous solid phase with isolated pores were prepared by the addition of different amounts of crushed naphthalene to an alumina casting slip. Samples of from 5 to 50% porosity were fired together for comparable grain development, eliminating structural variables except porosity. Effects of porosity and temperature on strength, elastic modulus, modulus of rigidity, and coefficient of thermal expansion were investigated. Effects of porosity on thermal stress resistance and tor-sional creep properties were studied at constant temperature.

[1]  J. Mackenzie,et al.  The Elastic Constants of a Solid containing Spherical Holes , 1950 .

[2]  R. Cabarat,et al.  Mesures statiques et dynamiques du module de Young de matériaux frittés , 1954 .

[3]  R. A. Heindl,et al.  III. PROGRESS REPORT ON INVESTIGATION OF SAGGER CLAYS: THEIR ELASTICITY AND TRANSVERSE STRENGTH AT SEVERAL TEMPERATURES1 , 1927 .

[4]  W. Kingery,et al.  Factors Affecting Thermal Stress Resistance of Ceramic Materials , 1955 .

[5]  T. Kê.  Viscous Slip Along Grain Boundaries and Diffusion of Zinc in Alpha‐Brass , 1948 .

[6]  B. Schwartz.  Thermal Stress Failure of Pure Refractory Oxides , 1952 .

[7]  F. E. Faris,et al.  The Thermal Dependence of the Elastic Moduli of Polycrystalline Graphite , 1952 .

[8]  J. F. Wygant.  Elastic and Flow Properties of Dense, Pure Oxide Refractories , 1951 .

[9]  P. Grootenhuis,et al.  Thermal and Electrical Conductivity of Porous Metals made by Powder Metallurgy Methods , 1952 .

[10]  J. B. Wachtman,et al.  Plastic Deformation of Ceramic‐Oxide Single Crystals, II , 1954 .

[11]  Eugene Ryshkewitch,et al.  Compression Strength of Porous Sintered Alumina and Zirconia , 1953 .

[12]  J. Francl,et al.  Thermal Conductivity: IX, Experimental Investigation of Effect of Porosity on Thermal Conductivity , 1954 .

[13]  A. W. Allen,et al.  Application of Sonic Moduli of Elasticity and Rigidity to Testing of Heavy Refractories , 1954 .

[14]  C. Zener.  Theory of the Elasticity of Polycrystals with Viscous Grain Boundaries , 1941 .

[15]  T. Kê.  Experimental Evidence of the Viscous Behavior of Grain Boundaries in Metals , 1947 .

[16]  J. B. Austin.  Thermal Expansion of Nonmetallic Crystals , 1952 .

[17]  R. Kieffer,et al.  Vergleich der Eigenschaften von gesinterten und geschmolzenen Metallen und Metallegierungen , 1943 .

[18]  R. Rao.  Elastic constants of alumina , 1949 .