Mechanical properties of partially stabilized zirconia crystals studied by kinetic microindentation

Alisin, V. V.; Борик, М. А.; Kulebyakin, A. V.; Ломонова, Е. Е.; Мызина, В. А.; Nelyubova, O. A.; Tabachkova, N. Yu.; Churlyaeva, O.N.

doi:10.1134/s0020168515060011

Cited by 20 publications

(11 citation statements)

References 14 publications

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“…Micromechanical properties (microhardness, elastic and plastic characteristics of the surface) of the materials were determined with the use of kinetic microhardness tester by CSM Instruments. The Vickers tetrahedral diamond pyramid was used in the experiments according to method [14]. The output parameters of the test results are shown in the form of primary kinetic penetration charts in the force and indentation depth coordinates.…”

Section: Materials and Equipmentmentioning

confidence: 99%

Nanostructured crystals of zirconium dioxide for mechanical modules of instruments

Alisin¹

2019

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the work is devoted to the study of nanostructured partially stabilized crystals of zirconium dioxide with respect to the problem of improving the reliability of the jeweled bearings of precision instruments. The effect of yttrium oxide stabilizing additive on the crack resistance and mechanical properties of crystals has been investigated. A correlation has been established between the concentration of the stabilizing additive Y2O3 and the crack resistance. The tribological properties of crystals were determined using a friction test machine under sliding conditions. The crack resistance and mechanical characteristics of the crystals were determined by the kinetic microindentation method. Results of the comparative analysis of mechanical properties with the used crystals and ceramics are provided. Bench tests of full-scale thrust bearings confirmed a higher load-bearing capacity of the friction bearing of the instrument with a mock-up thrust bearing made of a zirconium dioxide crystal in comparison with a thrust bearing made of sapphire in the absence of significant damage to the friction surface.

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Section: Materials and Equipmentmentioning

confidence: 99%

Nanostructured crystals of zirconium dioxide for mechanical modules of instruments

Alisin¹

2019

BALTTRIB

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“…Therefore, for the practical using of PSZ crystals, it is necessary to improve the edge strength, both by increasing the plasticity of the crystal and by strengthening the edges, for example, using laser treatment. An effective way of improving the mechanical characteristics of PSZ crystals is the introduction of impurities of rare-earth and transition elements into the crystal matrix [8] and selection of optimal synthesis conditions [9]. Optimization of the composition of PSZ crystals by doping with additional impurities of rare-earth and transition elements will increase crack resistance, wear resistance and plasticity of the centrifuge bearing material, which gives reason to expect an increase in the bearing capacity of the bearing and its service life in devices with an increased rotor speed in comparison with production samples made from leucosapphire.…”

Section: Introductionmentioning

confidence: 99%

“…Optimization of the composition of PSZ crystals by doping with additional impurities of rare-earth and transition elements will increase crack resistance, wear resistance and plasticity of the centrifuge bearing material, which gives reason to expect an increase in the bearing capacity of the bearing and its service life in devices with an increased rotor speed in comparison with production samples made from leucosapphire. Physical methods of surface examination are widely used to study the nature of surface wear [8][9][10]. Tribological studies of vertical rotor bearings with thrust bearings made of zirconia crystals are extremely insufficient.…”

Section: Introductionmentioning

confidence: 99%

Improving the mechanical properties of zirconia in instrument bearings

Alisin

Diethelm²,

Kulebyakin

et al. 2020

MATEC Web Conf.

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The article presents the issues of replacing leucosapphires in jeweled bearings of the axes of precision instruments with nanostructured crystals of partially stabilized zirconia. The statement is substantiated that doping with rare earth elements provides an improvement in the performance properties of precision instruments by improving the mechanical properties of bearing materials. The efficiency of doping of zirconia crystals with cerium and neodymium oxides is studied. It was found that doped crystals have increased plasticity, which provides an increase in the crack resistance of crystals. Special attention is paid to the issues of increasing the survivability of high-speed rotor bearings by replacing the thrust bearing of leucosapphire with nanostructured crystals of partially stabilized zirconia doped with cerium and neodymium. The efficiency of improving the mechanical properties is confirmed by the X-ray phase analysis of crystals. The phase composition is studied by Raman scattering and the lattice parameters are determined. The increased crack resistance of the thrust bearing is confirmed by tests performed using the kinetic microhardness method.

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“…Результаты исследования механических свойств кристаллов ЧСЦ, солегированных оксидами иттрия и церия приведены в работах [10,11]. Так, в работе [10] на единичном образце кристалла ЧСЦ (химических состав которого не приводится) были получены значения микротвердости H V и трещино-стойкости K 1c , которые составляли 14,0-14,45 ГПа и 11,43 МПa ⋅ м 1/2 соответственно.…”

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“…в кристаллах ЧСЦ, стабилизи-рованных 2,8 % (мол.) Y 2 O 3 , методом кинетического микроиндентирования показало, что такое солеги-рование приводит к увеличению кинетической твер-дости, кинетического модуля Юнга и пластичности кристаллов и, таким образом, позволяет повысить их механические характеристики [11].…”

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Study of Partially Stabilized Ce Doped Zro2 Crystals by Electron Paramagnetic Resonance

Борик¹,

Еремина²,

Ломонова³

et al. 2018

Izv. vysš. učebn. zaved., Mater. èlektron. teh.

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Аннотация. Проведено исследование кристаллов твердых растворов ZrO 2 (ЧСЦ), стабилизированных оксидами иттрия и церия, методом электронного парамагнитного резонанса (ЭПР) в X− и Q−диапазоне. В отожженных кристаллах ZrO 2 стабилизированных только оксидом иттрия (2,8 % (мол.) Y 2 O 3 ) установлено при-сутствие Zr 3+ центров. При добавлении СeO 2 к кристаллам ZrO 2 , помимо оксида иттрия, проявляется другой вид парамагнитных O -−центров. Для оценки концентрации ионов Ce 3+ в кристаллах ЧСЦ зарегистрированы спектры ЭПР в присутствии эталона при температуре 7 К. Идентифицированы парамагнитные ионы Ce 3+ и их относительное количество в кристаллах ЧСЦ до и после высокотемпературной термообработки. Пока-зано, что проведенные в работе отжиги на воздухе, приводят к уменьшению концентрации ионов Ce 3+ для всех составов, а также изменяют цвет кристаллов с красного на белый. В образце 2,0Y0,8CeZr после отжига количество парамагнитных ионов Ce 3+ уменьшилось примерно в два раза. В образце с малым содержание церия (0,1 % (мол.)) после отжига парамагнитные центры от Ce 3+ не регистрируются, что говорит о полном переходе Ce 3+ в состояние Ce 4+ . Показано, что образованные парамагнитные центры церия, связаны сильными обменными взаимодействиями. Угловая зависимость ЭПР линий от парамагнитных катионов Ce 3+ от прило-женного внешнего магнитного поля не наблюдалась. Вероятной причиной отсутствия угловой зависимости является то, что примесные редкоземельные ионы расположены рядом друг с другом, образуя примесные кластеры с эффективным спином S eff = 1/2. Ключевые слова: ЭПР, частично стабилизированый диоксид циркония

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Mechanical properties of partially stabilized zirconia crystals studied by kinetic microindentation

Cited by 20 publications

References 14 publications

Nanostructured crystals of zirconium dioxide for mechanical modules of instruments

Nanostructured crystals of zirconium dioxide for mechanical modules of instruments

Improving the mechanical properties of zirconia in instrument bearings

Study of Partially Stabilized Ce Doped Zro2 Crystals by Electron Paramagnetic Resonance

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