Ask Dr. Dave

Ask Dr. Dave: August 2012

August 1, 2012
/ Print / Reprints /
ShareMore
/ Text Size+
QUESTION: What types of adhesives can we use for very high-temperature applications (over 400°C)?
 
ANSWER: You should be looking at inorganic adhesives for these types of temperatures. Few organic adhesives can perform above 250°C, but certain inorganic ceramic adhesives have been developed to offer a service temperature of over 2,000°C. These adhesives are based on inorganic binding compounds, such as sodium silicates and various metal phosphates, with carbon, alumina, silica, magnesia or zirconia powder fillers.
 
Ceramic adhesives can be formulated into one- or two-part systems and are often supplied as a water-based binder solution and ceramic filler, which can be mixed into a slurry for application as adhesives or sealants. Suitable selection of the binder—and, more importantly, the filler—allows the adhesive’s coefficient of thermal expansion to be matched to that of a substrate to minimize stresses during heating and cooling. One-component adhesives will cure slowly by drying or can be heated to speed up the process. Formulations for which cure is accelerated by atmospheric moisture are also available.
 
These adhesives are often prime candidates for applications where low electrical conductivity and high thermal conductivity are crucial. The most important uses for inorganic adhesives are for high-temperature applications, particularly in ceramic and ceramic-to-metal bonding. Typical applications include infrared heaters, lamps and lighting, circuit breakers, high-temperature filters, and thermocouples.

Did you enjoy this article? Click here to subscribe to Adhesives & Sealants Industry Magazine.

Recent Articles by Dave Dunn

You must login or register in order to post a comment.

Multimedia

Videos

Image Galleries

In-Depth Features

These articles detail advantages and innovations for multiple end uses.

Podcasts

ExxonMobil Tackifier Expansion

Dwight Tozer, vice president of ExxonMobil’s Adhesion Industry business, discusses the company’s latest tackifier expansion project with Editor-in-Chief Susan Sutton.

More Podcasts

THE MAGAZINE

Adhesives & Sealants Industry Magazine

ASI April 2014 cover

2014 April

Our April issue focuses on pressure-sensitive adhesives, including a preview of PSTC's 2014 Tape Summit, as well as converting/packaging and composites!

Table Of Contents Subscribe

THE ADHESIVES STORE

handbook-sealant-tech.gif
Handbook of Sealant Technology

The Handbook of Sealant Technology provides an in-depth examination of sealants, reviewing their historical developments and fundamentals, adhesion theories and properties, and today’s wide range of applications.

More Products

asi1211p_Cover-DE.gifASI's Buyers' Guide

Annual purchasing resource for equipment used in the manufacture/formulation of adhesives, sealants, pressure sensitives, tapes and labels and for application of finished adhesives. 

Clear Seas Research

With access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.

STAY CONNECTED

facebook_40px twitter_40  youtube_40pxlinkedin_40