Modification of the mechanical properties of zirconium dioxide ceramics by means of multiwalled carbon nanotubes

Abstract

A ceramic matrix composite based on zirconium dioxide doped with carbon nanotubes (CNTs) and metallic silver as a plastic binder was produced by hydrothermal synthesis from ceramic precursor and a CNTs suspension followed by critical point drying of the synthesized hydrogel and metallic silver deposition on ceramic composite aerogel fragments from a AgNO 3 solution. Multi-indentation loading of the composite has revealed two types of mechanical response: 1) hardness decreasing with an increasing of number of cycles and 2) significant increasing of hardness with an increasing number of indentations. Local chemical composition analysis has revealed correlations between the composite hardness and the presence oxygen atoms for first type and silver and yttrium atoms for second type of mechanical response respectively.

Thermodynamics and kinetics of non-autonomous phase formation in nanostructured materials with variable functional properties

“…Research in the field of synthesis of new compounds with a high content of nonautonomous phases is aimed at both producing original functional materials with variable performance properties and developing related technologies for their production. In this regard, the synthesis of nanoceramics and other materials of constructional and functional purpose [3,4,7,8,24,76,192,[234][235][236][237][238][239][240][241][242][243][244][245][246], in particular, materials intended for use in thermoelectric energy converters [240,241], ferrites [13, 25, 52, 59, 64, 97-99, 107, 145], high-temperature superconductors [175,238,244], catalysts [13,22,36,37,39,40,46,60], radioactive waste immobilization matrices [236,237,239], is of great interest among the developments noted in Section 2.…”

Flintstone as a nanocomposite material for photonics

“…Research in the field of synthesis of new compounds with a high content of nonautonomous phases is aimed at both producing original functional materials with variable performance properties and developing related technologies for their production. In this regard, the synthesis of nanoceramics and other materials of constructional and functional purpose [3,4,7,8,24,76,192,[234][235][236][237][238][239][240][241][242][243][244][245][246], in particular, materials intended for use in thermoelectric energy converters [240,241], ferrites [13, 25, 52, 59, 64, 97-99, 107, 145], high-temperature superconductors [175,238,244], catalysts [13,22,36,37,39,40,46,60], radioactive waste immobilization matrices [236,237,239], is of great interest among the developments noted in Section 2.…”

Electrophysical Properties of Composite Produced Based on Zirconia/Multiwalled Carbon Nanotubes Aerogel

“…Материал. Аэрогель диоксида циркония, содержащего 0,2 вес.% МУНТ (фирма Carbon, США) получали гидротермальным синтезом и закритической сушкой гидрогеля прекурсора керамики [4]. Предварительная термообработка фрагментов аэрогеля обеспечила жесткую фиксацию пространственной конфигурации нанотрубок в пористой керамической матрице.…”

“…Фрагменты аэрогеля консолидировались в образцы-таблетки диаметром 15 мм и толщиной 1-2 мм методом горячего прессования при температуре 1200 ºС в графитовой пресс-форме в атмосфере аргона. Сканирующая электронная микроскопия и рентгеноструктурный анализ спеченных образцов показали, что фрагменты аэрогеля не претерпели значительных структурных изменений при горячем прессовании, а оксид циркония сохранил свою кубическую конфигурацию без уширения соответствующих пиков на рентгенограмме [4].…”