文章信息/Info

Title:

Investigation on Trans-Scale Hardness and Interface Gradient Effect of Advanced Coating System

文章編號:

1674-3962(2020)10-0723-05

作者:

梁立紅1; 劉海燕2;  宋晶如3; 王穎彪3; 魏悅廣2

（1. 北京化工大學機電學院，北京 100029）（2. 北京大學工學院 力學與工程科學系，北京100871）（3. 中國科學院力學研究所 非線性力學國家重點實驗室，北京100190）

Author(s):

LIANG Lihong1;  LIU Haiyan2;  SONG Jingru3;  WANG Yingbiao3;  WEI Yueguang2

(1. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China) (2. Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China) (3. The State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China)

關鍵詞:

陶瓷涂層; 納米壓痕; 硬度; 模量; 跨尺度; 界面

Keywords:

ceramic coating;  nano-indentation;  hardness;  modulus;  trans-scale;  interface

分類號:

TG174.4

DOI:

10.7502/j.issn.1674-3962.202005005

文獻標志碼:

A

摘要:

作為先進涂層，微米/納米顆粒陶瓷涂層在航空發動機葉片等關鍵部件中應用廣泛，其力學性能在較大程度上決定著部件服役的壽命及可靠性。先進涂層的宏觀力學性能緊密依賴于其微觀結構，即其具有跨尺度力學特性。對跨尺度力學行為的研究既是前沿熱點，又對先進涂層設計具有重要意義。首先觀察和分析了微米/納米顆粒（8YSZ）熱障涂層/Ni基超合金體系的微觀結構，然后采用耦合納米/宏觀壓痕法實驗和基于應變梯度和表界面效應的跨尺度力學理論研究了硬度及彈性模量的跨尺度行為�？绯叨扔捕妊芯堪l現，涂層表面宏觀硬度服從Weibull統計分布，納米結構涂層硬度分散性較��；納米壓痕硬度較高且隨壓深增加而減小。進而開展了對界面粘結層附近的壓痕硬度分布研究，結果顯示：無論是涂層還是基底，硬度及模量都隨離開界面距離的增加而減小。

Abstract:

As an advanced coating, micro-/nano-particle ceramic coating is widely used in key components such as aeroengine blades. Its mechanical properties determine the service life and reliability of components to a large extent. The macroscopic mechanical properties of the advanced coatings are closely dependent on their microstructure, that is to say, they have trans-scale mechanical properties. The study of trans-scale mechanical behavior is not only a hot spot, but also of great significance for advanced coating design. In this paper, the microstructure of micro-/nano-particle 8YSZ thermal barrier coating/Ni-based super-alloy system was observed and analyzed firstly. Then, the trans-scale behavior of hardness and elastic modulus was studied by coupling nano-/macro-indentation experiment and trans-scale mechanical theory based on strain gradient and surface/interface effect. It is found that the macroscopic hardness of the surface obeys the Weibull statistical distribution, and the hardness dispersion of the nano-structure coating is small; the hardness of the nano�瞚ndentation is high and decreases with the increase of the indentation depth. Moreover, the hardness and modulus decrease with the increase of the distance from the interface.