Borgekov Daryn B, Kozlovskiy Artem L, Zdorovets Maxim V, Shakirzyanov Rafael I, Kenzhina Inesh E, Shlimas Dmitriy I
Engineering Profile Laboratory, L.N. Gumilyov Eurasian National University, Nur-Sultan 010008, Kazakhstan.
Department of General Physics, Satbayev University, Almaty 050032, Kazakhstan.
Materials (Basel). 2023 Feb 27;16(5):1961. doi: 10.3390/ma16051961.
The aim of this paper is to study the effect of variation in the component ratio of (1-x)SiN-xAlO ceramics on the phase composition, strength and thermal properties of ceramics. To obtain ceramics and their further study, the solid-phase synthesis method combined with thermal annealing of samples at a temperature of 1500 °C typical for the initialization of phase transformation processes was used. The relevance and novelty of this study lies in obtaining new data on the processes of phase transformations with a variation in the composition of ceramics, as well as determining the effect of the phase composition on the resistance of ceramics to external influences. According to X-ray phase analysis data, it was found that an increase in the SiN concentration in the composition of ceramics leads to a partial displacement of the tetragonal phase of SiO and Al(SiO)O and an increase in the contribution of SiN. Evaluation of the optical properties of the synthesized ceramics depending on the ratio of the components showed that the formation of the SiN phase leads to an increase in the band gap and the absorbing ability of the ceramics due to the formation of additional absorption bands from 3.7-3.8 eV. Analysis of the strength dependences showed that an increase in the contribution of the SiN phase with subsequent displacement of the oxide phases leads to a strengthening of the ceramic by more than 15-20%. At the same time, it was found that a change in the phase ratio leads to the hardening of ceramics, as well as an increase in crack resistance.
本文的目的是研究(1-x)SiN-xAlO陶瓷的组分比例变化对陶瓷的相组成、强度和热性能的影响。为了制备陶瓷并对其进行进一步研究，采用了固相合成法，并结合在1500℃温度下对样品进行热退火，该温度是典型的相变过程起始温度。本研究的相关性和新颖性在于获得关于陶瓷组成变化时相变过程的新数据，以及确定相组成对陶瓷抵抗外部影响能力的作用。根据X射线相分析数据，发现陶瓷组成中SiN浓度的增加导致SiO和Al(SiO)O四方相的部分位移以及SiN贡献的增加。根据组分比例对合成陶瓷的光学性能进行评估表明，SiN相的形成由于形成了3.7 - 3.8 eV的额外吸收带，导致陶瓷的带隙和吸收能力增加。强度依赖性分析表明，SiN相贡献的增加以及随后氧化物相的位移导致陶瓷强度提高超过15 - 20%。同时，发现相比例的变化导致陶瓷硬化以及抗裂性增加。
