reaction sintering

Reaction sintering, also known as reaction bonding, is a method used to create dense covalent ceramics. This process involves shaping finely divided powders and then reacting them in a specific atmosphere at high temperatures. For example, reaction-bonded silicon nitride (RBSN) is made from silicon powders that are heated in a nitrogen-rich environment. Nitrogen reacts with the silicon, forming silicon nitride within the pores and bonding the particles together. This method results in minimal dimensional change, allowing for precise shapes and reducing the need for extensive post-firing machining. Reaction-bonded silicon carbide (RBSC) is produced similarly, with silicon reacting with carbon to form additional silicon carbide that binds the particles.1