Theoretical Prediction and Experimental Investigation on the Thermal and Mechanical Properties of Bulk β-Yb2Si2O7

被引：145

作者：

Zhou, Yan-Chun ^{[1
]}

Zhao, Cen ^{[1
,2
,3
]}

Wang, Feng ^{[2
]}

Sun, Yin-Jie ^{[1
]}

Zheng, Li-Ya ^{[4
]}

Wang, Xiao-Hui ^{[4
]}

机构：

[1] Aerosp Res Inst Mat & Proc Technol, Sci & Technol Adv Funct Composite Lab, Beijing 100076, Peoples R China

[2] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing Key Lab Electrochem Proc & Technol Mat, Beijing 100029, Peoples R China

[3] CNOOC Energy Technol & Serv Pipe Engn Co, Tianjin 300452, Peoples R China

[4] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2013年 / 96卷 / 12期

关键词：

ENVIRONMENTAL BARRIER COATINGS; MICROSTRUCTURAL EVOLUTION; DAMAGE TOLERANCE; CERAMICS; SI3N4; CONDUCTIVITY; TEMPERATURE; YB2O3; GAMMA-Y2SI2O7; STABILITY;

D O I：

10.1111/jace.12618

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The thermal and mechanical properties of -Yb2Si2O7 were investigated using a combination of first-principles calculations and experimental investigations. Theoretically, anisotropic chemical bonding and elastic properties, weak interatomic (010) and (001) planes in the crystal structure, damage tolerance, and low thermal conductivity are predicted. Experimentally, preferred orientation, superior mechanical properties, and damage tolerant behavior for hot-pressed bulk -Yb2Si2O7 are approved. Slipping along the weakly bonded {010}, {001}, or {100} planes, grain delamination, buckling, and kinking of nanolaminated grains are identified as main mechanisms for damage tolerance. The anisotropic linear thermal expansion coefficients (CTEs) are: (a)=(3.57 +/- 0.18)x10(-6)K(-1), (b)=(2.49 +/- 0.14)x10(6)K(-1), and (c)=(1.48 +/- 0.22)x10(-6)K(-1) (673-1273K). A low thermal conductivity of similar to 2.1W (mK)(-1) at 1273K has been confirmed. The unique combination of these properties endow it a potential candidate for thermal barrier coating (TBC)/environmental barrier coating of silicon-based ceramics.

引用

页码：3891 / 3900

页数：10

共 55 条

[1] A SIMPLIFIED METHOD FOR CALCULATING DEBYE TEMPERATURE FROM ELASTIC CONSTANTS [J].