EXAMINATION OF A WAKE-DILATATION MODEL OF MICROCRACK TOUGHENING IN CERAMICS Study on a Model Composite System with Low-Expansion Dispersed Particles

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概要

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• An attempt was made to examine the validity of a wake-dilatation model of microcrack toughening in ceramic matrix composites.Model two-phase, particulate composite system was chosen for study.Spheroidized alumina particles with average size 25 and 12μm, respectively, were dispersed in a soda lime silica glass having thermal expansion coefficient greater than the expansion coefficient of alumina.The composite containing 25-μm alumina particles was formulated by selecting a combination of differential thermal expansion and particle size, whereby microcrack toughening is expected to occur most effectively. Another composite containing 12-μm alumina particles was designed as a reference material, in which the condition for the occurrence of microcracking is not met.For both composites, specimens containing 30vol% of alumina particles were prepared by hot-pressing technique.Fracture toughness and R-curve measurements were carried out on each of the composites.Glass-alumina(25μm)composite exhibited a rising R-curve behavior.The experimental results were interpreted on the basis of a wake-dilatation model of microcracking.By evaluating physical parameters involved in the model, its validity was discussed.

• 社団法人日本材料学会の論文
• 1995-12-15

著者

• Miyata N

  Kyoto Univ. Kyoto‐shi

• Ozawa N

  Kyoto Univ. Kyoto‐shi

• MIYATA Noboru

  Division of Material Chemistry, Faculty of Engineering, Kyoto University

• OZAWA Naoshi

  Now with Central Research Laboratory, Nihon Cement Co., Ltd.

• Ozawa Naoshi

  Now With Central Research Laboratory Nihon Cement Co. Ltd.

• Miyata Noboru

  Division Of Material Chemistry Faculty Of Engineering Kyoto University

関連論文

• EXAMINATION OF A WAKE-DILATATION MODEL OF MICROCRACK TOUGHENING IN CERAMICS Study on a Model Composite System with Low-Expansion Dispersed Particles

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