Influence of heat treatment on microstructure and mechanical properties of Cansas-II SiC/PyC/CVI-SiC mini-composites

被引：10

作者：

Han, Xiao ^{[1
]}

Chen, Xihui ^{[1
]}

Ding, Junjie ^{[4
]}

Wu, Weijing ^{[1
]}

Sun, Zhigang ^{[1
,2
]}

Song, Yingdong ^{[1
,2
,3
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Energy & Power Engn, Jiangsu Prov Key Lab Aerosp Power Syst, Nanjing 210016, Peoples R China

[2] Minist Ind & Informat Technol, Key Lab Aeroengine Thermal Environm & Struct, Nanjing 210016, Peoples R China

[3] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing 210016, Peoples R China

[4] AECC Sichuan Gas Turbine Estab, Chengdu 610500, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2022年 / 48卷 / 01期

关键词：

SiC/PyC/SiC mini-Composites; Cansas-II SiC fibers; Heat treatment; Microstructure; Mechanical properties; SICF/SIC COMPOSITES; EVOLUTION; FIBER; STRENGTH; BEHAVIOR; DAMAGE; TEMPERATURE; FAILURE;

D O I：

10.1016/j.ceramint.2021.09.193

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 influence of heat treatment at 1300 degrees C and 1500 degrees C for 50h on the microstructure and mechanical properties of Cansas-II SiC/PyC/CVI SiC mini-composites was studied in detail. The interfacial shear strength decreases from 98.8 MPa to 13.6 MPa after the heat treatment at 1500 degrees C for 50h, which was mainly caused by the weak bonding between the SiC matrix and PyC interface due to the decomposition reactions and carbothermic reductions of CVI SiC matrix. The average tensile strength of fibers decreases with the rise of heat treatment temperature, which was primarily attributed to the significant growth of beta-SiC grains accompanied by the decomposition of SiCxOy. Due to the protective effect of the PyC interface and CVI SiC matrix on the fibers, the fraction of declined strength of the mini-composites is only 25.8% after the heat treatment at 1500 degrees C for 50h.

引用

页码：1077 / 1089

页数：13

共 31 条

[1] Effect of high temperature heat treatment in vacuum on microstructure and bending properties of SiCf/SiC composites prepared by CVI [J].