In the automotive industry, Hexagonal Boron Nitride with boron oxide as binder is used as a sealing
element in oxygen sensors (lambda
sensors). For modern engine control, measurement of the exact composition of the flue gas is necessary.
Lambda sensors measure the oxygen content in the flue gas relative to
a reference oxygen concentration. The signal is passed on to engine
control, which adjusts the
oxygen/fuel mixture appropriately.
To guarantee reliable measurement,
the measurement and reference
chamber is separated by a packing
seal. The dense pack material
must also be an electric insulator,
resistant to high temperature and
suitable for lambda sensor production. One of the two components of
the packing seal consists of a sealing
ring made of Momentive HBN Grade Hot Pressed Boron Nitride.
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