Ceskoslovenska Akademie Ved

Vysoka Skola Chemicko-technologicka

Josef Szabo

Karel Zverina

Petr Kroupa

Miloslav Bartuska

Antonin Cieslar

Veslav Maroszczyk

Valter Bohm

Borivoj Pospisil

Denek Tluchor

Jaromir Polidor

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

Method of and apparatus for stabilizing a plasma stream by the use of two different stabilization liquids. The plasma arc is stabilized in the discharge chamber by a whirl of a first stabilization liquid containing at least one element chosen from the group consisting of carbon and nitrogen, and the plasma arc is stabilized in the stabilization channel by a second stabilization liquid differing in its boiling point from the first stabilization liquid. Between the discharge chamber of the burner and the stabilization channel there is provided a transition space from which there lead outlets for the stabilization liquids. In the transition space there may be place an orifice plate dividing said space into two sub-spaces. From the stabilization channel upstream of the front nozzle of the burner there may be provided an outlet for the second stabilization liquid, which is disposed in the stabilization channel. In accordance with the invention the stabilization system of the plasma burner of torque is divided into two comparatively independent circuits.

Method of and apparatus for stabilization of low-temperature plasma of

There is disclosed a material for hot or plasma spraying, especially a material based on oxide ceramics, and a process for the production thereof. The composition of the invention is a mixture of powdered oxides containing at least two fundamental oxides with high melting point, and at least one glass-forming oxide the melting point of which is lower. The invention also includes a process for the production of such composition by the melting and agglomeration of individual components in the oxidizing medium of a plasma stream, including the special treatment of the starting components.

Material for plasma spraying and method of making same

Process of radial stabilization and homogenization of a plasma stream and a liquid stabilized plasma burner for the realization of such process. The arc is stabilized by its passage through several orifice plates, stabilized by a whirl or eddy of cooling liquid, then passes through a nozzle and is bent toward the peripheral surface of a rotatable anode lying out of the main outlet plasma stream issuing from the nozzle. The liquid stabilized burner has a rod cathode placed in the arc chamber, the cathode being progressively fed into the arc chamber to from an arc therewithin.

Process of and apparatus for producing a homogeneous radially confined

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Prague, Czechia

Josef Szabo