Influence of MXene (Ti3C2) Phase Addition on the Microstructure and Mechanical Properties of Silicon Nitride Ceramics.

Jaroslaw Wozniak,Artur Lachowski,Andrzej Olszyna,Tomasz Cygan,Dorota Moszczyńska,Mateusz Petrus,Agnieszka Jastrzębska,Tomasz Wojciechowski,Bogusława Adamczyk-Cieślak,Wanda Ziemkowska

doi:10.3390/ma13225221

Jaroslaw Wozniak, Artur Lachowski + Show 8 more

Open Access

https://doi.org/10.3390/ma13225221

Copy DOI

Journal: Materials (Basel, Switzerland)	Publication Date: Nov 19, 2020
Citations: 17	License type: CC BY 4.0

Affiliation: Warsaw University of Technology

Abstract

This paper discusses the influence of Ti3C2 (MXene) addition on silicon nitride and its impact on the microstructure and mechanical properties of the latter. Composites were prepared through powder processing and sintered using the spark plasma sintering (SPS) technic. Relative density, hardness and fracture toughness, were analyzed. The highest fracture toughness at 5.3 MPa·m1/2 and the highest hardness at HV5 2217 were achieved for 0.7 and 2 wt.% Ti3C2, respectively. Moreover, the formation of the Si2N2O phase was observed as a result of both the MXene addition and the preservation of the α-Si3N4→β-Si3N4 phase transformation during the sintering process.

Highlights

Silicon nitride is used in many different applications thanks to its excellent mechanical properties at elevated temperatures, thermal shock resistance and good tribological and wear properties [1,2,3,4].Silicon nitride crystallizes in two allotropic forms: low-temperature α-Si3 N4 and high-temperature β-Si3 N4
It can be observed that the dominant component was Ti3 AlC2 ; in addition to this phase, titanium carbide (TiC) was formed as a result that the dominant component was Ti3AlC2; in addition to this phase, TiC was formed as a result of the synthesis, and a small amount of unreacted graphite remained
Research was carried out to determine the effect of MXene phase addition on the mechanical and microstructure of Si obtained results indicate the absence

Summary

Introduction

Silicon nitride crystallizes in two allotropic forms: low-temperature α-Si3 N4 and high-temperature β-Si3 N4. Both types have a hexagonal structure but different stacking sequences: ABCD in the case of α-Si3 N4 and ABAB in β-Si3 N4. This affects the properties of individual phases: α-Si3 N4 is characterized by higher hardness, while β-Si3 N4 has higher chemical resistance. In addition to controlling the amount of the β-Si3 N4 phase in the ceramic sinter and the texturization of the β-Si3 N4 , this transformation can be used to improve the mechanical properties of the produced Si3 N4 ceramic [7].

Objectives

Methods

Results

Conclusion