通过在放电等离子烧结过程中同时添加氧化镁、氧化镧和氧化锆增强氧化铝陶瓷的机械性能和光学性能。

Enhanced mechanical and optical properties of alumina ceramics via simultaneous magnesium, lanthanum, and zirconium oxide addition in spark plasma sintering.

作者信息

Shargh A H Karimi, Ramazani M, Jamali H, Davar F, Sharifi E Mohammad, Torkian S, Nasresfahani A R

机构信息

Department of Materials Engineering, Malek Ashtar University of Technology, Isfahan, Iran.

Department of Chemistry, Isfahan University of Technology, Isfahan, Iran.

出版信息

Sci Rep. 2025 Jul 1;15(1):20588. doi: 10.1038/s41598-025-06197-1.

DOI:10.1038/s41598-025-06197-1

PMID:40593189

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12216391/

Abstract

This study investigates the synergistic effects of a novel triplex sintering aid system-magnesium oxide (MgO), lanthanum oxide (LaO), and zirconium oxide (ZrO)- on the mechanical and optical properties of transparent alumina ceramics fabricated using spark plasma sintering (SPS). The eigth specimens were sintered at 1350 °C for 10 min under 70 MPa pressure. The sample with the highest zirconia content (sample Z (100M100L100Z): 100 ppm LaO, 100 ppm MgO and 300 ppm ZrO) achieved a bulk density of 3.94 g/cm, corresponding to 99.9% of the theoretical density of alumina. This sample exhibited an infrared transmission of 71.4% at 5 μm and a visible transmittance of 32% at 750 nm, surpassing values reported for single or dual sintering aid systems. Mechanical testing revealed a microhardness of 19.34 ± 0.1 GPa and a fracture toughness of 5.24 MPa.m for sample Z. Additionally, this sample demonstrated the highest flexural strength of 356.83 MPa, attributed to its finer grain size, reduced porosity, and the synergistic effects of the triplex sintering aids. The results demonstrate a promising pathway for producing high-performance transparent alumina ceramics with tailored properties for demanding optical and mechanical applications.

摘要

本研究调查了一种新型三元烧结助剂体系——氧化镁（MgO）、氧化镧（LaO）和氧化锆（ZrO）——对采用放电等离子烧结（SPS）制备的透明氧化铝陶瓷的力学性能和光学性能的协同效应。八个试样在70MPa压力下于1350℃烧结10分钟。氧化锆含量最高的样品（样品Z（100M100L100Z）：100ppm LaO、100ppm MgO和300ppm ZrO）的体积密度达到3.94g/cm，相当于氧化铝理论密度的99.9%。该样品在5μm处的红外透过率为71.4%，在750nm处的可见光透过率为32%，超过了单烧结助剂体系或双烧结助剂体系所报道的值。力学测试显示，样品Z的显微硬度为19.34±0.1GPa，断裂韧性为5.24MPa·m。此外，该样品的弯曲强度最高，为356.83MPa，这归因于其更细的晶粒尺寸、更低的孔隙率以及三元烧结助剂的协同效应。结果表明，为满足苛刻的光学和机械应用需求，生产具有定制性能的高性能透明氧化铝陶瓷具有一条很有前景的途径。