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Graphite parts coated by pyrolytic graphite PG layer
Protective PG layers of high purity are deposited on graphite and other substrates, typical thickness of the layer is in the range of 0,01 – 0,03 mm. Previously porous surface of the graphite object becomes smooth and sealed, resembling a metal surface. Components coated with PG layers are chemically more inert as graphite itself and also stable to high temperatures up to 3000°C, impermeable, no dusting, and partially more resistant to scratching and etching. PG coated components are most commonly used as heaters, screws, covers mainly in special atmosphere processes exposed to high temperatures and pressures.

     
Sample crucibles and components made by Phostec


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Graphite parts coated by pyrolytic boron nitride PBN layer
Protective PBN layers of high purity are deposited on graphite substrates, typical thickness of the layer is in the range of 0,1 – 0,2 mm. This deposition of PBN creates a thin ceramic layer with excellent mechanical, electrical and thermal attributes and brings super surface chemical stability at difficult high temperature environment.

PBN coated parts are especially used in scientific research & development, high-tech machines, crystal growth equipment and other.

The main advantage of this technology is the ability to create perfectly chemical inert parts of complex shape, which are impossible to produce from the PBN itself, and these parts could be applied in the areas where the simple non coated graphite could not be used.

     
Sample crucibles and different covers made by Phostec


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Sintered boron nitride BN parts coated by pyrolytic boron nitride PBN layer
The reason for this application is similar to PBN deposition, but here the sintered BN the deposited body disposes much higher chemical stability.

The protective PBN layer of high purity deposited on sintered BN substrates seals all the surface pores. After the deposition, some application may require additional surface polishing.

Again, the main advantage of this technology is the ability to create perfectly chemical inert parts of complex shape, which are impossible to produce from the PBN itself, and these parts have higher no porosive surface quality with further polishing ability.


Examples of parts made from different types of sintered BN and deposited with thin PBN layer


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Graphite parts coated by pyrolytic silicium – nitride PSi3N4 layer
This technology offers very interesting application where the surface protection with PG or PBN layers is not enough, and pyrolytic silicium nitride PSi3N4 layer is required. We have realized the series of such deposition processes with partial success, and still the further tuning of technology is needed. In case of interest we can offer research cooperation in this field to potential customer.

     
Small graphite crucibles Ø 40 mm and Ø 100 mm with protective PSi3N4 layer


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Graphite parts coated by pyrolytic boron - carbide PB4C layer
We have partially developed this technology when searching for good protective layers for our own application. Presently there is no regular production of PB4C layer but we are opened to research cooperation in this field also.

The PB4C layer exhibits extreme hardness - B4C is third hardiest material on the Earth after the diamond and cubic boron-nitride CBN, very high chemical stability and heat resistance.

Again the main advantage of PB4C coating is similar to PBN coating: ability to manufacture graphite parts of complex shape, which is impossible to produce from pure B4C, but the coated PB4C layer will show the same characteristic appearance as the pure B4C.


Example of graphite part covered with very hard PB4C layer


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