Blast-furnace tuyere

Details Blast-furnace tuyere Blast-furnace tuyere

1978-10-19

1980-02-19

Andrews, M. J.

Metallurgical apparatus

Means for introducing fluent into vessel, e.g., tuyere

Having means preventing damage to introducing means, e.g.,...

428675, 428926, C21B 716

Patent

active

041891309

ABSTRACT:
A blast-furnace tuyere having excellent thermal shock resistance and high durability consists of a tuyere substrate composed of copper or copper alloy, a self-fluxing alloy metallized layer sprayed on the substrate, a cermet coating sprayed on the alloy metallized layer, and a ceramic coating sprayed on the cermet coating. The cermet coating is made from a mixture of an alloy material consisting essentially of 5 to 60 wt% of Co, 5 to 50 wt% of Ni, 5 to 25 wt% of Cr, 5 to 40 wt% of Mo, 5 to 40 wt% of W, 3 to 40 wt% of Si and inevitable impurities, and a ceramic eutectic material consisting essentially of 95 to 65 wt% of Al.sub.2 O.sub.3, 5 to 30 wt% of ZrO.sub.2, 2 to 20 wt% of TiO.sub.2, 3 to 30 wt% of SiO.sub.2 and inevitable impurities. The ceramic coating is made from the same ceramic material as used in the formation of the cermet coating.

REFERENCES:
patent: 3069760 (1962-12-01), Schultz
patent: 3977660 (1976-08-01), Nakahira

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