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Metal-based thermal barrier coatings (MBTBCs) have
been produced, using Induction plasma spraying (IPS)
of nanostructured alloy powders. Important advances
have been made over recent years to ceramic-based
thermal barrier coatings (TBCs) for internal
combustion engines application, but they are not yet
applied in mass production situations.
Besides the important economic considerations, the
reliability of ceramic TBCs is also an issue, due to
the difficulty of predicting in-service lifetime.
Through engineering of the nano/amorphous structure
of MBTBCs, their thermal conductivity can be made as
low as those of ceramic-based TBCs. The thermal
conductivity of MBTBCs was found to be
as low as 1.99W/m/K. Thermal expansion coefficient
(TEC) of MBTBCs was 13E-6/K, which is close to the
TEC of cast iron and thus, closer to the TEC values
of aluminium alloys than are conventional TBCs.
Fracture toughness of MBTBCs has also been assessed
by use of Vickers hardness tests, with a 500g load
for 15s, and there are no measurable crack
developments around indented areas on MBTBCs
tested.
been produced, using Induction plasma spraying (IPS)
of nanostructured alloy powders. Important advances
have been made over recent years to ceramic-based
thermal barrier coatings (TBCs) for internal
combustion engines application, but they are not yet
applied in mass production situations.
Besides the important economic considerations, the
reliability of ceramic TBCs is also an issue, due to
the difficulty of predicting in-service lifetime.
Through engineering of the nano/amorphous structure
of MBTBCs, their thermal conductivity can be made as
low as those of ceramic-based TBCs. The thermal
conductivity of MBTBCs was found to be
as low as 1.99W/m/K. Thermal expansion coefficient
(TEC) of MBTBCs was 13E-6/K, which is close to the
TEC of cast iron and thus, closer to the TEC values
of aluminium alloys than are conventional TBCs.
Fracture toughness of MBTBCs has also been assessed
by use of Vickers hardness tests, with a 500g load
for 15s, and there are no measurable crack
developments around indented areas on MBTBCs
tested.