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

P. V. Andreev; Андреев П. В.; P. D. Drozhilkin; Дрожилкин П. Д.; L. S. Alekseeva; Алексеева Л. С.; K. E. Smetanina; Сметанина К. Е.; E. E. Rostokina; Ростокина Е. Е.; S. S. Balabanov; Балабанов С. С.; M. S. Boldin; Болдин М. С.; A. A. Murashov; Мурашов А. А.; G. V. Shcherbak; Щербак Г. В.

doi:10.31857/S0002337X2308002X

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

作者: Andreev P.V.¹^,2, Drozhilkin P.D.², Alekseeva L.S.², Smetanina K.E.², Rostokina E.E.¹, Balabanov S.S.¹, Boldin M.S.³, Murashov A.A.², Shcherbak G.V.³
隶属关系:
1. Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences
2. Lobachevsky State University
3. Lobachevsky State University of Nizhny Novgorod
期: 卷 59, 编号 8 (2023)
页面: 934-941
栏目: Articles
URL: https://permmedjournal.ru/0002-337X/article/view/668194
DOI: https://doi.org/10.31857/S0002337X2308002X
EDN: https://elibrary.ru/BFNMEE
ID: 668194

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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.

关键词

silicon nitride, ceramics, spark plasma sintering, powder composite, hardness, fracture, toughness

参考

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