文章信息/Info

Title:

Research on the High Temperature Self-Healing Behavior of Yb2Si2O7-Based Matrix Composites

文章編號:

1674-3962(2025)03-0217-09

作者:

劉玥豆; 王旭; 劉玲; 馬壯; 楊茗佳

1. 北京理工大學材料學院，北京 100081 2. 北京理工大學 沖擊環境材料技術國家級重點實驗室，北京 100081 3. 北京星航機電裝備有限公司，北京 100074

Author(s):

LIU Yuedou;  WANG Xu;  LIU Ling;  MA Zhuang; YANG Mingjia

1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China 2. National Key Laboratory of Science and Technology on Materials Under Shock and Impact,Beijing Institute of Technology， Beijing 100081, China et al.

關鍵詞:

Yb2Si2O7; 復合材料; 自愈合; 裂紋; 環境障涂層

Keywords:

Yb2Si2O7;  composite material;  self-healing;  crack;  environmental barrier coating

分類號:

TQ174.1；TB332

DOI:

10.7502/j.issn.1674-3962.202408019

文獻標志碼:

A

摘要:

SiCf/SiC陶瓷基復合材料滿足新一代航空發動機高推重比的發展要求，但在發動機內部高溫惡劣環境下，需用環境障涂層對該復合材料進行防護。目前環境障涂層在服役過程中不可避免地會產生裂紋，因此，需要開發一種具有自愈合能力的環境障涂層，在裂紋出現時及時修復。以Yb2Si2O7材料為基礎，分別采用放電等離子燒結和無壓燒結制備了Yb2Si2O7-SiC和Yb2Si2O7-Yb2SiO5復合陶瓷，開展了Yb2Si2O7基復合材料的自愈合行為研究，并探究了該復合材料作為自愈合環境障涂層材料的可行性。結果表明，向Yb2Si2O7陶瓷中添加SiC第二相時，含5%和10%（質量分數，下同）SiC的Yb2Si2O7-SiC復合材料在空氣中1100 ℃熱處理1 h后，由于表面的SiC氧化形成SiO2，SiO2的填充作用以及反應引起的體積膨脹促進了裂紋愈合；而在1300 ℃下熱處理，SiC大量氧化產生較大體積膨脹，含5%和10% SiC的Yb2Si2O7-SiC復合材料內部反而出現新的裂紋。而向Yb2Si2O7陶瓷中添加Yb2SiO5第二相可以促進材料致密化和裂紋愈合，當Yb2SiO5添加量為50%時，復合材料的裂紋愈合效率最高，約為78%，主要可歸因于具有較高熱膨脹系數的Yb2SiO5受熱膨脹,對Yb2Si2O7產生壓應力,促進了裂紋愈合。

Abstract:

SiCf/SiC ceramic matrix composites meet the high thrust-to-weight ratio requirements of next-generation aeroengines but require environmental barrier coatings for protection under extreme high-temperature conditions. Current environmental barrier coatings inevitably develop cracks during service,necessitating self-healing coatings for autonomous crack repair. In this study, based on Yb2Si2O7,Yb2Si2O7-SiC and Yb2Si2O7-Yb2SiO5 were fabricated via spark plasma sintering and pressureless sintering, respectively. The self-healing behavior of these composites was investigated to evaluate their feasibility as environmental barrier coating materials.Results show that adding 5wt%~10wt% SiC to Yb2Si2O7 promoted crack healing after 1 h at 1100 ℃ in air, driven by SiO2 formation from SiC oxidation, which filled cracks through volume expansion. However, at 1300 ℃, excessive SiC oxidation caused significant volumetric stress, generating new cracks within the composites. Yb2SiO5 addition enhanced material densification and crack healing. The composite with 50wt% Yb2SiO5 achieved optimal healing efficiency (78%), attributed to thermally induced compressive stress from higher thermal expansion coefficient of Yb2SiO5. This stress facilitated crack closure in the Yb2Si2O7 matrix.