A study of the fracture of a layered-granular material made from aluminum oxide

Иванов, Д. А.; Fomina, G. A.; Val’yano, G. E.; Vlasov, A. S.

doi:10.1007/bf01398280

Cited by 2 publications

(1 citation statement)

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“…The rate of deformation in specimens under a lumped load was 8 × 10-6 m/see. The crack resistance was determined for specimens ofZrO 2 partially stabilized by 12 mol.% CeO2 and sintered from a powder prepared by the method of chemical deposition, for specimens sintered from industrial GLMK powder (AI203 + 0.5% MgO), and for aluminum oxide specimens with a layered granular structure (some aspects of fracture in the latter have been considered in [14]). Table 1 below presents results of tests for crack resistance of three batches of specimens with the same composition but different values of p, conditions of powder synthesis in the stage of precipitation from the solution, and sintering temperatures.…”

Section: Experimental Methodsmentioning

confidence: 99%

Some methodological features of determination of crack resistance in ceramic materials

Иванов¹,

Fomina²

1996

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The known methods for forming stress concentrators (cracks and notches) in ceramic specimens in order m determine their crack resistance are described. A method for forming a notch with a tip curvature radius of at most 10 btm is suggested. The notch is first formed in the process of pressing the specimen in a specially designed mold and then the green specimen is cut additionally from the tip of the notch by a steel blade with a thickness of 0.1 mm and a grinding angle of 14L After sintering, this specimen does not contain induced defects that are possible when sintered specimens are notched by a diamond disk by the conventional method. It is shown for a ZrO2 ceramics partially stabilized by 12 mol.% CeO2 and an AIzO3 ceramics with 0.5 wt.% MgO possessing a layered granular structure that an incorrect choice of the tip curvature radius can result in an erroneous evaluation of the optimality of the structure of the material and an incorrect choice of the technological parameters for its production. Notching by the suggested method made it possible to establish the discrete nature of fracture of the layered granular structure of the ceramics from strain diagrams and the mechanisms of crack propagation causing this kind of fracture.

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Section: Experimental Methodsmentioning

confidence: 99%