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US 4,049,250 AGranted
Crucible
AssigneeProlizenz AG
InventorWalter Schmidt
Life of this patent
Estimating the term…
Abstract
A crucible, for use in connection with oxidizing melts on the interior at elevated temperatures includes a crucible body composed of a material selected from the group consisting of platinum metals and tungsten, and a continuous coating of a metal disposed on the inner surface of the body, the coating metal being substantially non-alloying with the material and having a low affinity for oxygen.
Claims8
A crucible for use with an oxidizing melt at elevated temperatures, comprising
- a crucible body composed of a material selected from the group consisting of platinum metals and tungsten and which is able to withstand the elevated melt temperatures but is subject to corrosion due to the oxidizing character of the melt;
- and
- a continuous anti-corrosion coating on the inner surface of said crucible body, said coating being of a metal which is substantially non-alloying with the material of said crucible body and which has a low affinity for oxygen so as to protect said material of said crucible body from said oxidizing melt and thereby prolong the useful life of said body.
A method of forming a crucible for use with an oxidizing melt at elevated temperatures, comprising the steps of
- providing a crucible body composed of a material selected from the group consisting of platinum metals and tungsten;
- forming at the interior surface of said body a continuous coating of a metal selected to be substantially non-alloying with said material of said body and to have a low affinity for oxygen and a high degree of surface diffusion, so that said coating protects said crucible body against corrosion by said melt and thereby prolongs the useful life of said crucible body.
Dependencies are inferred from the claim text.