Thermal Barrier Coatings And Anti Molten Metal Coatings In Thermal Spraying Industry

       

What are the functions of thermal barrier
coatings in the spraying industry? The thermal barrier coating has low thermal
conductivity, which can be used as a thermal barrier to reduce the heating
degree of the base metal. What are the requirements for thermal barrier
coatings? The coating shall meet the following requirements: it must be
resistant to oxidation at working temperature; Good heat resistance; The
coefficient of thermal expansion is as close as possible to the matrix; Low
thermal conductivity.

The recommended spraying materials are
chromium oxide, alumina and magnesium chromate. The recommended spraying method
is plasma spraying. Application examples include induction coil of high
temperature furnace, brazing and heat treatment fixture, torch thermal barrier,
heating cover, pyrometer sleeve and U-groove of cast iron plant.

What are the functions and applications of
anti molten metal coatings?

The anti molten metal coating can withstand
the action of molten metals such as zinc, aluminum, steel, iron and copper.
What are the requirements for anti molten metal coatings? These coatings shall
be able to withstand the corrosion of slag and flux and the corrosion of metal
vapor and oxygen near the melt liquid level; Prevent the formation of low
melting alloy between coating and melt; Can withstand thermal fatigue and
thermal shock.

The recommended spraying materials are
alumina, magnesium chromate, scheelite and platinum. The recommended spraying
methods are plasma spraying and combustion flame spraying. Application examples
include galvanizing tank, casting tank, mold, tuyere, zinc distillation tank,
condensate pipe, zinc alloy melting furnace, galvanizing impregnation tank,
blast furnace slag mouth, aluminum mold, copper mold, continuous caster mold,
sand mold, plate mold, zinc smelting stirring device, mold guard, oxygen pipe
nozzle, converter oxygen lance, ladle nozzle, metal melt temperature measuring
head and graphite electrode.

In the production of metallurgical
industry, the major factor of failure of various mechanical equipment is wear,
and the more important function of thermal spraying is to provide
wear-resistant coating to effectively protect a large number of Engineering wear.
This type of coating has a wider range of applications than other types. The
wear mechanism is complex, there are many types, and the metallurgical
production conditions are different, so the functions and requirements of this
kind of coating are also different.

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