高压高温优质铌二硅陶瓷的合成及结构性能研究

Ceramics International

(

IF

5.6

)

Pub Date : 2023-08-23

, DOI:

10.1016/j.ceramint.2023.08.246

Zhengang Zhang

,

Yajie Yu

,

Haihua Chen

,

Jianyi Ma

,

Binnian Zhong

,

Cheng Lu

高质量硅化物陶瓷的合成一直具有挑战性，主要是由于硅化物的熔点高且难以获得均匀的成分。本研究报告了致密且均质的铌二硅（NbSi2）陶瓷，采用高温高压（HTHP）技术制成。合成块状 NbSi2对陶瓷的微观结构、相稳定性和抗氧化性以及压力对其物理性能的影响进行了广泛的表征，然后将结果与第一原理计算进行了比较。通过慢调高温高压烧结方法调节样品的微观结构和相对密度，从而显着影响NbSi的物理性能和热稳定性2陶瓷。该研究结果为硅化物陶瓷的物理性质提供了有价值的见解，有可能为多功能陶瓷材料的进一步设计和合成铺平道路。

"点击查看英文标题和摘要"

Synthesis and investigation of structural properties of high-quality niobium disilicon ceramics at high pressure and high temperature

The synthesis of high-quality silicide ceramic has been challenging mainly due to the high melting point of the silicide and the difficulty in achieving a uniform composition. This study reports the synthesis of dense and homogeneous niobium disilicon (NbSi2) ceramics, accomplished with high-temperature and high-pressure (HTHP) technology. The synthesized bulk NbSi2 ceramics were extensively characterized for their microstructures, phase stabilities, and oxidation resistance, along with the effects of pressure on their physical properties, and the results were then compared with first-principles calculations. The microstructures and relative densities of the sample were regulated by the slow-modulated HTHP sintering method, thus significantly influencing the physical properties and thermal stabilities of the NbSi2 ceramics. The findings of the study provide valuable insights into the physical properties of silicide ceramics, th potentially paving the way for the further design and synthesis of multifunctional ceramic materials.

更新日期：2023-08-23