China's Refractories

《中国耐火材料》英文版

China's Refractories ›› 2020, Vol. 29 ›› Issue (4): 23-28.DOI: 10.19691/j.cnki.1004-4493.2020.04.005

• Original article • Previous Articles     Next Articles

Porous Ultra-high Temperature Ceramics for Ultra-high Temperature Thermal Protection System

LI Fei, LIU Jixuan, ZHANG Guojun*()   

  1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, Donghua University, Shanghai 201620, China
  • Online:2020-12-15 Published:2020-12-15
  • Contact: ZHANG Guojun
  • About author:Li Fei received his Ph.D. in materials physics and chemistry from Shanghai Institute of Ceramics Chinese Academy of Sciences (SICCAS) in 2015. After that he worked as an assistant professor in SICCAS until 2018. Then he joined Prof. Guojun Zhang’s group at Donghua University. He is a specially appointed researcher at Osaka University from December 2020. His research focuses on the design, preparation and characterization of high-entropy materials and porous ceramics.

Abstract:

Ultra-high temperature ceramics (UHTCs) are a family of borides, carbides and nitrides of transition elements such as hafnium, zirconium, tantalum and niobium. They exhibit the highest known melting points, good mechanical strength, good chemical and thermal stability under certain conditions. In last decade, researchers dedicated to characterize porous UHTCs aiming to develop novel thermal insulating materials that could withstand temperatures over 2 000 °C. In this article, the preparation and characteristics of porous UHTCs were reviewed. Dry processing, colloidal processing and solution processing routes have been used to prepare porous UHTCs with porosities ranging from 5% to 97% and pore sizes ranging from hundreds of nanometers to hundreds of micrometers. The obtained porous UHTCs are chemically and dimensionally stable at temperatures up to 2 000 °C during static state high-temperature thermal aging.

Key words: ultra-high temperature ceramics, porous ceramics, thermal protection system, extreme environments