基于具有石榴石结构的YNdAlO氧化物的细晶陶瓷在水热条件下的水解稳定性研究

Study of the Hydrolytic Stability of Fine-Grained Ceramics Based on YNdAlO Oxide with a Garnet Structure under Hydrothermal Conditions.

作者信息

Alekseeva Liudmila, Nokhrin Aleksey, Boldin Maksim, Lantsev Eugeniy, Murashov Artem, Orlova Albina, Chuvil'deev Vladimir

机构信息

Materials Science Department, Physico-Technical Research Institure, Lobachevsky State University of Nizhny Novgorod, 603022 Nizhny Novgorod, Russia.

出版信息

Materials (Basel). 2021 Apr 23;14(9):2152. doi: 10.3390/ma14092152.

DOI:10.3390/ma14092152

PMID:33922684

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8122912/

Abstract

The hydrolytic stability of ceramics based on YNdAlO oxide with a garnet structure obtained by the spark plasma sintering (SPS) method has been studied. The tests were carried out in distilled water under hydrothermal conditions in an autoclave and, for comparison, in a static mode at room temperature. The mechanism of leaching of Y and Nd from the ceramics was investigated. It has been shown that at "low" temperatures (25 and 100 °C), the destruction of pores occured, and the intensity of the leaching process was limited by the diffusion of ions from the inner part of the sample to the surface. At "high" test temperatures (200 and 300 °C), intense destruction of the ceramic grain boundaries was observed. It was assumed that the accelerated leaching of neodymium is due to the formation of grain-boundary segregations of Nd in sintered ceramics.

摘要

研究了通过放电等离子烧结（SPS）法获得的具有石榴石结构的基于YNdAlO氧化物的陶瓷的水解稳定性。测试在高压釜中的水热条件下于蒸馏水中进行，作为对比，也在室温下的静态模式中进行。研究了Y和Nd从陶瓷中浸出的机制。结果表明，在“低温”（25和100°C）下，孔隙发生破坏，浸出过程的强度受离子从样品内部扩散到表面的限制。在“高温”测试温度（200和300°C）下，观察到陶瓷晶界的强烈破坏。据推测，钕的加速浸出是由于烧结陶瓷中形成了Nd的晶界偏析。