Изучено поведение при сжатии керамики Аl2O3 с объeмом порового пространства от 35 до 60% с иерархической поровой структурой трeх видов: крупной пористости размером 80-100 mum, мелкой пористости размером 14-15 mum и промежуточной межблочной пористости, включающей протяженные (110-120 mum) поровые микроканалы, образованные в результате зонального обособления при спекании. Показано, что полученная иерархическая поровая структура обусловливает формирование иерархической деформационной структуры в объеме керамики и приводит к понижению масштаба процессов разрушения от макроскопического в случае унимодальной керамики до микромасштабного разрушения, сравнимого с размерами сформировавшихся при спекании блоков. DOI: 10.21883/PJTF.2017.15.44874.16652
It has been studied the behavior under compression tests of alumina ceramics with multilevel pore structure. The porosity approximately was 50% and included pores of three types - large pores with an average size of 120 µm, small porosity with an average size of 2 µm and extended pore channels about 150 µm length formed as a result of zonal shrinkage during sintering. It was shown that during loading of material with this multilevel pore structure there are arising micro-damages in whole sample and as result in a lowering a scale level of fracture from macro- to meso- and microlevel. Residual strain is appears even at a very low stresses smaller 30% of material strength only due to movements of separate blocks formed after sintering.
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