Influence of calcium on the fracture strength of polycrystalline alumina
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A. W. FUNKENBUSCH is Metallurgist, Research and Development Center, General Electric Company, Schenectady, N.Y.D.W. SMITH is Associate Professor of Metallurgical Engineering, Michigan Technological University, Houghton, MI. Manuscript submitted May 8, 1975. METALLURGICAL TRANSACTIONS A
Table I. Physical Characteristics of Sintered AI203
Sample No.
WtPet MgO
Wt Pet CaO
Sintered Density,Pct
AverageGrain Size,pm
1 2 3 4 5
0.2 0.2 0.2 0.2 0.2
0.05 0.10 0.15 0.20
99.6 99.5 99.4 99.3 98.6
9 10 10 10 24
Table II. AES and Fracture Toughness Data for Sintered AI203 Specimens
Sample No.
Vol Pet SecondPhase
Fracture Surface CalciumLevel (At. Pet)
ApparentKIC (10s dyne cm-sn)
1
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