Solid State Metal-Ceramic Reaction Bonding
It has been found that when certain metals and ceramic materials are held in intimate contact and heated, a reaction occurs at the interface. This results in a strong bond being formed which remains durable even after long periods at elevated temperatures.
With base metals the reaction that occurs results in a macroscopic spinel-type bond being formed between metal and ceramic. “Noble” metals also undergo a similar bonding reaction, which has been observed directly in the electron microscope at magnifications of several 100,000, where an intermediate liquid phase can be seen to form at the metal surface and run over the surface of the ceramic. This phase does not recrystallize on cooling, and the nature of the bond mechanism is not understood.
This process, which is known as “Solid State Reaction Bonding”, has important industrial uses, particularly those involving high temperature “in service” conditions. In general, reaction bonding occurs with a wide range of metals and ceramics, but platinum, gold, copper and nickel appear to be the most significant industrially.
KeywordsReaction Bonding Beryllium Oxide Aluminium Silicate Lead Platinum Leak Tightness
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