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2020 | OriginalPaper | Chapter

28. Processing of Ceramic Foams for Thermal Protection

Authors : Sujith Vijayan, Praveen Wilson, Kuttan Prabhakaran

Published in: Handbook of Advanced Ceramics and Composites

Publisher: Springer International Publishing

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Abstract

The rapid industrialization and increased space exploration activities necessitate the development of materials of low thermal conductivity capable of withstanding very high temperatures. These materials are called thermal protection materials. They are used either to protect the nearby persons from the heat flux of high-temperature heat treatments in industries or to protect the instruments and astronauts within the crew cabin of a space vehicle from the intense heat flux generated during its reentry into the atmosphere. The high-temperature ceramics such as alumina, silica, zirconia, mullite, SiC, silicon nitride, and silicon oxycarbide are capable of withstanding high temperatures. The materials of choice at extremely high temperatures (above 2000 °C) are either carbon or ultrahigh-temperature ceramics. They include borides and nitrides such as TiB₂, ZrB₂, HfB₂, TiN, ZrN, etc. These materials in their dense state though withstand high temperatures they also exhibit relatively high thermal conductivity. In addition to the high-temperature capability, the thermal protection materials should be light in weight and have low thermal conductivity. The aspect of low density is of utmost importance in thermal protection materials used for space applications as an increase in weight increases the amount of fuel required for takeoff and subsequent reentry. The way to achieve lightweight and low thermal conductivity in ceramic materials is by making them porous. The porous ceramics with porosity greater than 70 vol% are called ceramic foams.

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previous chapter PZT and Lead-Free Piezo Ceramics for Aerospace and Energy Applications

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Title: Processing of Ceramic Foams for Thermal Protection
Authors: Sujith Vijayan
Praveen Wilson
Kuttan Prabhakaran
Publisher: Springer International Publishing
Book: Handbook of Advanced Ceramics and Composites
Print ISBN: 978-3-030-16346-4

Electronic ISBN: 978-3-030-16347-1

Copyright Year: 2020
DOI: https://doi.org/10.1007/978-3-030-16347-1_34

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