Fabrication of multi-anionic high-entropy carbonitride ultra-high-temperature ceramics by a green and low-cost process with excellent mechanical properties  

作　　者：Liansen Xia Shun Dong Jianqiang Xin Kaixuan Gui Peitao Hu Yongshuai Xie Dongdong Yang Xinghong Zhang Yanchun Zhou 

机构地区：[1]National Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology,Harbin 150001,China [2]Institute for Aero Engine,Tsinghua University,Bejing 100084,China [3]School of Materials Science and Engineering,Anhui Polytechnic University,Wuhu 241000,China [4]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Journal of Advanced Ceramics》2023年第6期1258-1272,共15页先进陶瓷（英文）

基　　金：supported by the National Natural Science Foundation of China(Nos.52272060,51902067,51872066,and 52002001);Key Program of National Natural Science Foundation of China(No.52032003);the China Postdoctoral Science Foundation(Nos.2019M651282 and 2022T150157);the Heilongjiang Provincial Postdoctoral Science Foundation(Nos.LBH-Z19022 and LBH-TZ2207);Heilongjiang Touyan Innovation Team Program,the Shanghai Aerospace Scienceand Technology Innovation Fund(No.SAST2019-012);the Fundamental Research Funds for the Central Universities(No.FRFCU5710051022);the Science Foundation of National Key Laboratory of Science and Technology on Advanced composites in Special Environments(No.JCKYS2022603C011);Domestic Visiting and Studying Project for Outstanding Young Key Talents in Universities of Anhui Province(No.gxgnfx2021131);Young and Middle-aged Top Talent Project of Anhui Polytechnic University.

摘　　要：As a new category of ultra-high-temperature ceramics(UHTCs),multi-anionic high-entropy(HE)carbonitride UHTCs are expected to have better comprehensive performance than conventional UHTCs.However,how to realize the green and low-cost synthesis of high-quality multi-anionic HE carbonitride UHTC powders and prepare bulk ceramics with excellent mechanical properties still faces great challenges.In this work,a green,low-cost,and controllable preparation process of(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C,N_(1-x) powders is achieved by sol-gel combined with the carbothermal reduction/nitridation method for the first time.The as-synthesized(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C_(x)N_(1-x) powders possess high compositional uniformity and controllable particle size.In addition,the obtained bulk ceramics prepared at 1800℃exhibit superior fracture toughness(Kic)of 5.39±0.16 MPa·m^(1/2) and high nanohardnesof 35.75±1.23 GPa,lastic modulus(E)of 566.70±8.68 GPa,and flexural strength of 487±41 MPa.This study provides a feasible strategy for preparing the high-performance HE carbonitride ceramics in a more environmentally friendly and economical manner.

关 键 词：high-entropy(HE)carbonitride ceramics multi-anionic structure sol-gel green synthesis mechanical properties 

分 类 号：TQ174.1[化学工程—陶瓷工业]