Ceramic Welding

Ceramic Welding

Ceramic Welding Technology

Ceramic Welding is basically a proven method for hot repairs of industrial furnaces under operating temperatures. A mixture of
ceramic and metallic particles is projected with oxygen onto the hot refractory ceramic surface and melts on impact both the
projected powder, as well as the surface, thus creating a bond, equivalent to metallic welding.

The Ceramic Welding method allows furnace repairs without having to cool down the surface. In fact, the battery can keep on
producing while an individual oven is repaired. In contrast to a gunning repair, Ceramic Welding provides long lasting repair results,
which are measured in years not months.

DUN Industrial Services Pvt Ltd, an Authorised Service Provider of World's Global Leader in Ceramic Welding Technologies
DOMINION NovoCOS, who provides this technology for Coke Ovens batteries. DOMINION NovoCOS uses state of the art
equipment which is audited and certified for technical functionality and safety by TÜV inspection.

DOMINION NovoCOS works to the highest standards of Health & Safety, meeting or exceeding all requirements relating to working

Which Coke Oven types and refractory-defects can be repaired?

DUN has the expertise and the Know-How of DOMINION NovoCOS to repair all types of different coke ovens as well as all types of
refractory defects inside a coke oven.

That means in practice, DUN with technology of DOMINION NovoCOS can repair all refractory defects inside “top-charging”-,
“stamp-charging”-, but also “heat recovery” ovens in India.

The previous photo shows the repairs inside a “top-charging” oven, whereas below you see a repair at a “heat-recovery” oven.

Special Brickwork Technology

Partial rebricking using fused silica modules:

Where the damage to the coke oven walls is already so severe that there are holes in the wall, brick-
shaped modules made from fused silica grain are utilized. These are fixed in place by Ceramic Welding
which is also used to fill any remaining gaps.

The fused silica material will not display the thermal expansion seen with fired silica brick which is why
there are no heat- up problems, which is why they are known in the cokemaking industry as zero
expansion bricks.