Invited Speaker

Assoc. Prof. Lian Zhu

National University of Defense Technology

Title: Research on the Design, Preparation, and High-Temperature Service Performance of Ultra-High-Temperature Iridium and Modified Iridium Coatings

Profile: 

Li’an Zhu, an associate professor at the School of Aerospace Science and Engineering, National University of Defense Technology, has long been engaged in the research of ultra-high-temperature thermal structures and coating materials. He has presided over projects such as the National Natural Science Fund, the National Defense Science and Technology Innovation Special Zone Project, and subtopics of the Basic Strengthening Project. He serves as a member of the Thermal Protection Composite Materials Branch of the China Composites Society, the Molten Salt and Chemical Technology Branch of the China Nonferrous Metals Society, and the Youth Committee of the Chinese Society for Heat Treatment. He also acts as a youth editor for several journals, including the Chinese Journal of Nonferrous Metals, Rare Metal Materials and Engineering, Tungsten, and Materials Engineering. He has published more than 90 papers in journals such as Advanced Powder Materials and Corrosion Science, and has been granted more than 20 invention patents, with six of them being successfully transferred for commercial use. He has received two first prizes for scientific and technological progress in the military, and has been selected as a Young Science and Technology Talent in the Military and a Youth Talent of Hunan Province.

Abstract:

With the increase in the flight speed of high-speed vehicles, the key hot-end components of their propulsion and thermal protection systems are imposing increasingly higher temperature requirements on ultra-high-temperature thermal protection materials. There is an urgent need to develop ultra-high-temperature thermal protection coating materials with a service temperature exceeding 2000℃. Iridium is the material with the lowest high-temperature oxygen permeability among all known materials. When used as a thermal protection coating on the surface of refractory metals or carbon-based materials, it can significantly enhance the service performance of metal/carbon-based composite materials in high-temperature, oxygen-rich environments.

This report focuses on the research progress of our team in the design, fabrication, and high-temperature service performance of iridium and its alloyed/ceramized modified coatings. It is hoped that this work will provide an ultra-high-temperature, zero-ablation, and wide-temperature-range thermal protection coating solution for thermal structural components serving in extreme thermal environments.