Nanocomposites and nanomaterials

Manufacturing of pressureless sintered silicon nitride with various additives 
Lukianova O.A.1, Khmara A.N.1, Kolesnikov D.A.1, Krasilnikov V.V.1,  Parkhomenko A.A.2
1 Belgorod National Research University, 85 Pobedy str., Belgorod - 308015,
Russia. 
E-mail: sokos100@mail.ru
2 Institute of Solid State Physics, Materials Science and Technologies NAS of Ukraine, 1,Academic str., Kharkov - 61108, Ukraine.

It is well known that silicon nitride has high strength, thermal stability, high-temperature strength, good oxidation resistance and low thermal expansion coefficient. Such methods of manufacturing as traditional sintering, hot isostatic pressing (HIP) and spark plasma sintering (SPS) of silicon nitride have been investigated extensively over the past few decades. We have considered such popular supplements like Al2O3-MgO and Al2O3-Y2O3 in our previous papers [1-4]. The effect of such ternary systems as Al2O3-MgO-La2O3, Al2O3-MgO-Y2O3 and Al2O3-Y2O3-La2O3 on properties of silicon nitride remains unclear and requires additional research.
The aim of the current study is to clarify the effect silicon nitride with double and triple additives. 

1.	Lukianova O., Sirota V.V., Dielectric properties of silicon nitride ceramics produced by free sintering  // Ceramics Int.-2017.-43.-P. 8284–8288.
2.	Krasil'nikov V.V., Sirota V.V., Ivanov A.S., Kozlova L.N., Luk'yanova O.A., Ivanisenko V.V., Investigation of the structure of Si3N4-based ceramic with Al2O3 and Y2O3 additives // Glass Ceram.-2014.-1.-P. 17–19.
3.	Sirota V., Krasilnikov V., Lukianova O., Fabrication of the ceramics based on silicon nitride by free sintering and cold isostatic pressing // NANOCON 2013—conference proceedings, 5th international conference.-2013.-1.-P. 248–251.
4.	Lukianova O., Mechanical and elastic properties of new silicon nitride ceramics produced by cold isostatic pressing and free sintering // Ceramics Int.-2015.-41.-P. 13716–13720.