Novel niobium-tungsten crucible

Abstract

A new niobium-tungsten crucible is provided, which has a crucible body, the crucible body is a barrel-shaped structure made of niobium-tungsten alloy, the upper opening of the crucible body is fitted with a crucible cover, and the lower end of the crucible cover is formed with a downward convex The plate I and the convex plate I wrap the upper end opening of the crucible body, and the inner peripheral wall surface of the convex plate I of the crucible cover and the outer peripheral wall surface of the opening end of the crucible body are adapted and bonded to each other. The invention forms a niobium-tungsten alloy crucible by adding tungsten with a radius similar to that of niobium atoms, thereby improving the mechanical properties and chemical stability of the pure niobium crucible, ensuring the purity of the melt in the crucible, and prolonging the service life of the crucible.

Description

Technical field [0001] The invention belongs to the technical field of metal smelting equipment, and specifically relates to a new niobium-tungsten crucible. Background technique [0002] At present, pure niobium crucible has poor high-temperature oxidation resistance, easily reacts with oxygen and nitrogen, and the grain structure changes under high temperature conditions. The arrangement of atoms on the grain boundary is looser than that in the grain, and there are many defects such as vacancies, dislocations, and bond deformation. Therefore, the grain boundary is susceptible to thermal erosion and chemical corrosion, and it is easy to cause impurity atoms (ions) to segregate to form a brittle envelope. In addition, the formed C brittle envelope reacts with elements in the air in a high temperature environment, and it will affect the crucible Both the life span and the purity of the melt in the crucible cause damage and influence. As a rare metal, niobium has a high cost, and i...

AI Technical Summary

Problems solved by technology

[0002] At present, pure niobium crucibles have poor high-temperature oxidation resistance, are easy to react with oxygen and nitrogen, and the grain structure changes under high temperature conditions. The arrangement of atoms on the grain boundaries is looser than that in the grains, and there are many defects such as vacancies, dislocations, and bond deformations. , so the grain boundary is susceptible to thermal erosion and chemical corrosion, and it is easy to cause impurity atoms (ions) to segregate to form a brittle coating. Furthermore, the formed C brittle coating reacts with elements in the air at high temperature and is harmful to the crucible. Both the service life and the purity of the melt in the crucible will cause damage and influence, and as a rare metal, niobium is too expensive, and its continuous loss will inevitably increase the economic burden of the enterprise, so it is necessary to improve

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