Crucible for vacuum induction melting and manufacturing method thereof

Abstract

The invention relates to a crucible for vacuum induction melting and a manufacturing method thereof. The crucible is tied on a bottom brick in an induction coil of a vacuum induction furnace. The crucible is characterized by being designed as a double-layered composite structure, wherein the inner layer is an inner shell which is used for melting and made of high-chemically stable crucible material with low decomposing pressure; and the outer layer is an outer shell which is made of low-cost crucible material and has the functions of heat insulation and support. The manufacturing method comprises the following steps in sequence: (1) paving a layer of outer shell material of the crucible at the bottom of the tied crucible, paving a layer of inner shell material of the crucible, and rammingthe material of the crucible; (2) mounting a graphite core, and placing a thin cylinder between the graphite core and an asbestos insulation layer; (3) tying the inner and outer shells of the crucible, and adding the inner shell material of the crucible between the graphite core and the thin cylinder and ramming the inner shell material of the crucible, and then adding the outer shell material ofthe crucible between the graphite core and the asbestos insulation layer; and (4) roasting the induction coil by electrifying the induction coil, and extracting the graphite core after cooling. The crucible manufactured by the manufacturing method of the crucible for vacuum induction melting has low cost.

Description

technical field [0001] The invention relates to a crucible for vacuum induction melting and a manufacturing method thereof. Background technique [0002] Due to the special requirements for the purity and performance of the applied materials in many special application fields, many types of materials including stainless steel and non-ferrous alloys need to be smelted with high purity to achieve extremely low levels of impurity elements such as sulfur and phosphorus and Oxygen content requirements. The magnesia crucible that is commonly used in vacuum induction melting furnaces is not suitable for smelting the above special varieties because of its high decomposition pressure in the vacuum high-temperature smelting environment and does not have the effect of desulfurization, phosphorus and other impurities. CaO-based or its composition, ZrO-based or its composition, and ZrB-based or its composition crucibles are suitable for varieties with higher smelting requirements due to...

AI Technical Summary

Problems solved by technology

[0033]However, compared to commonly used low-cost crucibles such as MgO, Al2O3 bases, CaO bases, etc. Due to the complexity of the material and manufacturing process of the crucible, some need to add high-cost additives to control the hydration problem, and the overall cost remains high, resulting in a significant increase in the cost of the special alloy smelted, which limits the wide application of this crucible with excellent overall performance

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