Preparation of Si3N4 Ceramics with 3 wt % Y2O3–Al2O3 (2 : 1, 1 : 1, 3 : 5) Additions by Spark Plasma Sintering

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α-Si3N4-based powder composites containing 3 wt % Y2O3–Al2O3 sintering aids with 2 : 1, 1 : 1, and 3 : 5 stoichiometries have been prepared by the Pechini process and spray drying. We have studied four ceramic samples produced by spark plasma sintering of the powder composites. The sintering process was run under a load of 70 MPa at a heating rate of 50°C/min as long as shrinkage of the powder composites continued. We have analyzed the shrinkage behavior of the powder composites during the sintering process; evaluated the activation energy for sintering; and measured the density, microhardness, and fracture toughness (cracking resistance) of the ceramic samples. The highest hardness, HV = 16.5 GPa, in combination with a fracture toughness KIc = 3.8 MPa m1/2, was offered by the material with an Y2O3 : Al2O3 molar ratio of 3 : 5 sintered at 1860°C. The corresponding densification factor was 99.0%. The starting mixture for this material was synthesized using spray drying.

作者简介

P. Andreev

Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences; Lobachevsky State University

Email: andreev@phys.unn.ru
603137, Nizhny Novgorod, Russia; 603022, Nizhny Novgorod, Russia

P. Drozhilkin

Lobachevsky State University

Email: andreev@phys.unn.ru
603022, Nizhny Novgorod, Russia

L. Alekseeva

Lobachevsky State University

Email: golovkina_lyudmila@mail.ru
603022, Nizhny Novgorod, Russia

K. Smetanina

Lobachevsky State University

Email: andreev@phys.unn.ru
603022, Nizhny Novgorod, Russia

E. Rostokina

Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences

Email: andreev@phys.unn.ru
603137, Nizhny Novgorod, Russia

S. Balabanov

Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences

Email: andreev@phys.unn.ru
603137, Nizhny Novgorod, Russia

M. Boldin

Lobachevsky State University of Nizhny Novgorod

Email: nokhrin@nifti.unn.ru
Russia, 603022, Nizhny Novgorod

A. Murashov

Lobachevsky State University

Email: golovkina_lyudmila@mail.ru
603022, Nizhny Novgorod, Russia

G. Shcherbak

Lobachevsky State University of Nizhny Novgorod

编辑信件的主要联系方式.
Email: nokhrin@nifti.unn.ru
Russia, 603022, Nizhny Novgorod

参考

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版权所有 © П.В. Андреев, П.Д. Дрожилкин, Л.С. Алексеева, К.Е. Сметанина, Е.Е. Ростокина, С.С. Балабанов, М.С. Болдин, А.А. Мурашов, Г.В. Щербак, 2023