Microstructure and mechanical properties of Zr_(3)Al_(3)C_(5)-based ceramics synthesized by Al-Si melt infiltration  

作　　者：Xiaomeng FAN Yuzhao MA Yangfang DENG Jinxue DING Laifei CHENG 

机构地区：[1]Science and Technology on Thermostructural Composite Materials Laboratory,Northwestern Polytechnical University,Xi’an 710072,China [2]College of Materials Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China [3]AECC Sichuan Gas Turbine Establishment,Chengdu 610500,China

出　　处：《Journal of Advanced Ceramics》2021年第3期529-536,共8页先进陶瓷（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.51702261,52072303,and 51821091);the Natural Science Foundation of Shaanxi Province(No.2019JQ-634);the 111 Project(No.B08040);the Fundamental Research Funds for the Central Universities.

摘　　要：In this work,bulk Zr_(3)Al_(3)C_(5)-based ceramics were synthesized by the infiltration of A1-Si melt into zirconium carbide (ZrC) perform.The phase composition,microstructure,and mechanical properties of as-fabricated ceramics were studied.The results demonstrate that Si is more effective to reduce the twin boundary energy of ZrC than A1,and thus promotes the decrease of formation temperature of Zr_(3)Al_(3)C_(5).With the infiltration temperatures increasing from 1200 to 1500 ℃,the Zr_(3)Al_(3)C_(5) content increases from 10 to 49 vol%,which is contributed to the increase of flexural strength from 62±9 to 222±10 MPa,and fracture toughness (KIC) from 2.8+0.2 to 4.1±0.3 MPa.m^(1/2).The decrease of mechanical properties for the samples fabricated at 1600 ℃ is ascribed to the abnormal growth of Zr_(3)Al_(3)C_(5) grains.

关 键 词：Zr_(3)Al_(3)C_(5) ultra-high-temperature ceramics(UHTCs) twin CARBIDE Al-Si alloy 

分 类 号：TQ174.758.12[化学工程—陶瓷工业]