Anisotropic thermal expansion in high-entropy multicomponent AlB_(2)-type diboride solid solutions  

作　　者：Frédéric Monteverde Mattia Gaboardi Federico Saraga Lun Feng William Fahrenholtz Gregory Hilmas 

机构地区：[1]National Research Council of Italy,Institute of Science Technology and Sustainability for Ceramics,Faenza 48018,RA,Italy [2]Elettra—Sincrotrone Trieste S.C.P.A,Strada Statale 14—Km 163,5 in AREA Science Park,Basovizza 34149,Trieste,Italy [3]Missouri University of Science and Technology,Rolla,MO 65409,United States of America [4]AUREL Spa,I-47015(Modigliana,Italy) [5]BLUE ORIGIN,98302(Kent,Washington US).

出　　处：《International Journal of Extreme Manufacturing》2023年第1期331-343,共13页极端制造（英文）

基　　金：financial support for the XRPD experiments (proposals nr. 20200101 and 20210215);supported by the U.S. National Science Foundation through Grant CMMI-1902069

摘　　要：High-entropy(HE)ultra-high temperature ceramics have the chance to pave the way for future applications propelling technology advantages in the fields of energy conversion and extreme environmental shielding.Among others,HE diborides stand out owing to their intrinsic anisotropic layered structure and ability to withstand ultra-high temperatures.Herein,we employed in-situ high-resolution synchrotron diffraction over a plethora of multicomponent compositions,with four to seven transition metals,with the intent of understanding the thermal lattice expansion following different composition or synthesis process.As a result,we were able to control the average thermal expansion(TE)from 1.3×10^(−6)to 6.9×10^(−6)K^(−1)depending on the combination of metals,with a variation of in-plane to out-of-plane TE ratio ranging from 1.5 to 2.8.

关 键 词：ultra-high temperature ceramics borides high-entropy ceramics spark plasma sintering synchrotron diffraction anisotropic thermal expansion 

分 类 号：TQ174.1[化学工程—陶瓷工业]