Crucible for fusing titan and method of preparation thereof

A technology of crucible and graphite crucible, which is applied in the direction of crucible furnace, fusion spraying, coating of superimposed layers, etc., which can solve the problems of high energy consumption, uneven composition, serious pollution, etc.

Inactive Publication Date: 2009-07-29
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of complex process, huge energy consumption, serious pollution and uneven composition in the process of melting titanium alloy at high temperature in the prior art, the present invention provides a crucible for melting titanium

Method used

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Experimental program
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Embodiment Construction

[0010] The preparation method of the composite coating of the molten titanium crucible includes the following links:

[0011] (1) Graphite substrate pretreatment

[0012] (2) Preparation of siliconized layer on graphite surface

[0013] (3) Preparation of gradient coatings formed by combining high stability compounds with refractory metals

[0014] (4) Integrated coating treatment

[0015] Graphite substrate pretreatment, that is, the inner surface of the processed graphite crucible is ultrasonically purified, and then high-temperature heat treatment is performed at 1000°C for 1 hour to reduce volatile carbon sources and graphite dust attached to the surface. At the same time, the surface of the graphite substrate Micropores are formed to form a bite between the SiC inner layer and the graphite, improve the interface bonding strength between the SiC inner layer and the graphite, and improve the physical compatibility between the graphite and the coating.

[0016] The invent...

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Abstract

The invention relates to a crucible for fusing titanium and a production method thereof, mainly used for fusing titanium alloy as well as for fusion cast of other special alloys. Highly stable compounds (yttrium oxide, calcium zirconate or cerium sulphide, etc.) are used as the outer layer of the crucible for fusing titanium; refractory metals (tungsten, molybdenum or tantalum) and the like are combined with the compounds to form transition gradient coating; hot spray processes (laser cladding, plasma spraying, etc.) are used for spraying the transition layers and the transition gradient coating onto the inner surface of a graphite container layer by layer to form a firm and compact composite coating with good thermal shock resistance. By adopting the crucible of the invention to carry out vacuum induction fusion of titanium and titanium alloy, the fused alloy has uniform component, the fusion process consumes less energy and the crucible produces less contamination to the molten titanium.

Description

technical field [0001] The invention relates to a crucible for smelting titanium and titanium alloy melts and a manufacturing method thereof, belonging to the technical field of titanium alloy smelting. Background technique [0002] Due to its high melting point and active chemical properties, titanium can react with almost all crucible refractory materials such as zirconia, magnesia, and silicon oxide during smelting. Therefore, induction furnaces are usually not used for smelting. At present, the smelting of titanium and titanium alloys often adopts vacuum consumable electrode arc solidification furnace melting and forced water-cooled copper crucible cooling. When smelting in the vacuum arc shell furnace, it first solidifies on the wall of the copper crucible to form a thin layer of "shell", which protects the titanium liquid from being polluted by the crucible material and has the function of heat insulation. Due to the fast cooling speed of the water-cooled copper cruci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B14/10C22B34/12C23C28/00C23C10/44C23C4/06C23C4/10
Inventor 王小康孔浡毛协民李重河
Owner SHANGHAI UNIV
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