文章信息/Info

Title:

Study on the Nanomechanical Properties of RETa3O9 Tantalate Ceramics

文章編號:

1674-3962(2025)03-0235-09

作者:

周星; 陳琳; 李晨宇; 陳勛磊; 張陸洋; 徐浩; 馮晶

昆明理工大學材料科學與工程學院，云南 昆明 650093

Author(s):

ZHOU Xing;  CHEN Lin;  LI Chenyu;  CHEN Xunlei;  ZHANG Luyang;  XU Hao;  FENG Jing

Faculty of Materials Science and Engineering, Kunming University of Science and Technology,Kunming 650093, China

關鍵詞:

稀土鉭酸鹽; 納米壓痕; 斷裂韌性; 力學性能; 環(huán)境障涂層

Keywords:

rare earth tantalate;  nanoindentation;  fracture toughness;  mechanical property;  environmental barrier coating

分類號:

TG174.4

DOI:

10.7502/j.issn.1674-3962.202501019

文獻標志碼:

A

摘要:

環(huán)境障涂層材料廣泛應用于航空發(fā)動機和高超聲速飛行器的陶瓷基復合材料表面，主要起到隔絕高溫水蒸氣和空氣的作用。為確保足夠長的服役壽命，環(huán)境障涂層材料需具備高韌性、高硬度和較低楊氏模量等特性。采用放電等離子燒結工藝制備了致密的RETa3O9（RE=La，Nd，Sm，Gd，Ho）鉭酸鹽陶瓷，并系統(tǒng)研究了其納米力學性能。利用納米壓痕儀對RETa3O9陶瓷的硬度、楊氏模量、斷裂韌性、耐磨性和剛度等關鍵力學性能進行了系統(tǒng)表征，并分析了影響其力學性能的主要因素。研究結果表明，RETa3O9陶瓷的楊氏模量（166.72~196.70 GPa）和硬度（9.52~11.69 GPa）主要受稀土離子半徑和致密度的影響。斷裂韌性（1.44~1.82 MPa·m1/2）與晶粒尺寸密切相關，采用放電等離子燒結工藝制備的RETa3O9陶瓷具有更細小的晶粒尺寸，從而顯著提高了斷裂韌性。剛度（186 064~285 730 N·m-1）和耐磨性（0.60～0.65）則主要受到材料本身硬度和楊氏模量影響，該陶瓷剛度與硬度呈正相關，耐磨性較高。通過納米壓痕測試評估了RETa3O9陶瓷的綜合力學性能，探究了它作為環(huán)境障涂層材料使用的可行性，發(fā)現(xiàn)SmTa3O9展現(xiàn)出優(yōu)異的綜合力學性能，是極具前景的環(huán)境障涂層候選材料。

Abstract:

Environmental barrier coating materials are widely applied on the surface of ceramic matrix composites in aero engines and hypersonic vehicles, primarily serving to isolate high-temperature water vapor and air. To ensure a sufficiently long service life, environmental barrier coating materials must possess characteristics such as high toughness, high hardness, and relatively low Young’s modulus. In this study, dense RETa3O9 (RE=La, Nd, Sm, Gd, Ho) tantalate ceramics were prepared by spark plasma sintering technology, and their nanomechanical properties were systematically investigated. The nanoindentation technique was employed to comprehensively characterize key mechanical properties of RETa3O9 ceramics, including hardness, Young’s modulus, fracture toughness, wear resistance and stiffness, while analyzing the main factors influencing these mechanical properties. The research results demonstrate that the Young�餾 modulus (166.72～196.70 GPa) and hardness (9.52～11.69 GPa) of RETa3O9 ceramics are mainly influenced by rare earth ion radius and density. The fracture toughness (1.44～1.82 MPa·m1/2) shows a strong correlation with grain size, and the RETa3O9 ceramics prepared by spark plasma sintering process exhibit finer grain size, which significantly enhances fracture toughness. The stiffness (186 064～285 730 N·m-1) and wear resistance (0.60～0.65) are primarily affected by the material’s hardness and Young’s modulus, with stiffness showing a positive correlation with hardness, while demonstrating overall excellent wear resistance. This study comprehensively evaluated the integrated mechanical properties of RETa3O9 ceramics through nanoindentation testing system, exploring their potential as environmental barrier coating materials. The results indicate that SmTa3O9 exhibits outstanding comprehensive mechanical properties, making it a highly promising candidate material for environmental barrier coatings.