Ceskoslovenska Akademie Ved

Vysoka Skola Chemicko-technologicka

Antonin Cieslar

Karel Zverina

Petr Kroupa

Josef Szabo

Miloslav Bartuska

Veslav Maroszczyk

Karel Rybak

Valter Bohm

Valter Boehm

Veslav Marosczyk

Eduard Zelezny

The present invention relates to the foundry industry and solves the problem of extended service life of valve closure gate assemblies for foundry ladles. The valve closure gate assembly of the present invention comprises two mutually slidable heat-resistant gates furnished with a protecting layer of an oxide refractory material and having flow-through rings made from an oxide refractory material disposed in the openings of the gates. The respective upper and lower surfaces of the rings are coated with a layer of refractory material.

Valve closure gate assembly for foundry ladles

A method of bonding at least two types of refractory ceramic materials, a first material being, for example, fireclay and a second material being, for example, alumina, to each other in order to enhance both the abrasion and corrosion resistances of heat resistant plates for valve closures of foundry ladles. The second, thermally more resistive material, which is applied to the first material in the form of relatively small particles, is preheated on at least the outer surface layers of the particles, the entire volume of the particles usually being preheated or even molten. The bonding of the two preheated materials occurs in such a way that minute particles up to drops of the second, thermally more resistive material are thrown at high speed (with high kinetic energy) onto the preheated surface of the first material. The source of such a relatively high kinetic energy can be constituted by either an explosion or a plasma beam ejected at a high outlet velocity out of the mouth of a plasma torch.

Method of bonding at least two types of ceramic materials to each other

Growing community of inventors

Trinec, Czechoslovakia

Antonin Cieslar