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Titanium and titanium alloy smelting furnace materials

A technology for smelting crucibles and titanium alloys, applied in crucible furnaces, furnace types, furnaces, etc., can solve the problem of difficult sintering and molding of calcium oxide, and achieve the effects of reducing power consumption for smelting, improving mechanical strength, and uniform alloy composition.

Inactive Publication Date: 2006-08-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, calcium oxide is difficult to sinter and form, and it is easy to hydrolyze in the air

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The boron nitride powder and an appropriate amount of flux are uniformly mixed, and the compositions of the flux are respectively: 0.5% zirconium oxide, 1% magnesium oxide and 1.5% boron oxide in terms of boron nitride weight percentage. The crucible blank is pressed by cold isostatic pressing, and sintered at 1800°C for 1 hour to obtain the finished melting crucible. This melting crucible is used in a 1000Hz vacuum medium frequency induction furnace melting. Melting and pouring 10 kg of titanium-nickel shape memory alloy consumes 24KW of power. During melting, it does not react with titanium at high temperature and does not bond with the alloy. After smelting and pouring, the composition of the alloy is uniform and its performance is stable.

Embodiment 2

[0014] The boron nitride powder and an appropriate amount of flux are uniformly mixed, and the compositions of the flux are respectively: 1.5% zirconium oxide, 1.5% boron oxide and 1% aluminum oxide in terms of boron nitride weight percentage. The crucible blank is pressed by cold isostatic pressing, and sintered at 1700°C for 1.5 hours to obtain the finished melting crucible. This melting crucible is used in a 1000Hz vacuum medium-frequency induction furnace melting. Melting and pouring 10 kg of titanium-nickel shape memory alloy consumes 27KW of power. During melting, it does not react with titanium at high temperature and does not bond with the alloy. After smelting and pouring, the composition of the alloy is uniform and its performance is stable.

Embodiment 3

[0016] The boron nitride powder and an appropriate amount of flux are uniformly mixed, and the compositions of the flux are respectively: 1.5% zirconium oxide and 0.5% boron oxide in terms of weight percentage of boron nitride. The crucible blank is pressed by cold isostatic pressing, and sintered at 1800°C for 1 hour to obtain the finished melting crucible. This melting crucible is used in a 1000Hz vacuum medium-frequency induction furnace melting, melting and pouring 10 kg of titanium alloy consumes 25KW of power, and does not react with titanium at high temperature during melting, and does not bond with the alloy. After smelting and pouring, the composition of the alloy is uniform and its performance is stable.

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Abstract

A crucible for smelting Ti and Ti-alloy in vacuum induction furnace is prepared from boron nitride and flux.

Description

technical field [0001] The invention relates to a titanium and titanium alloy smelting crucible material and a manufacturing method of the crucible made of the material, belonging to the technical field of high-temperature-resistant smelting materials. Background technique [0002] Due to the high melting point and very active chemical properties of titanium, liquid titanium can react with almost all crucible refractory materials such as zirconia, magnesia, silicon oxide and alumina during its smelting. Therefore, induction furnaces cannot be used for its smelting smelting. At present, the melting of titanium and titanium alloys in industry often adopts vacuum consumable electrode arc shell furnace melting and forced water-cooled copper crucible cooling. When smelting in the vacuum arc shell furnace, a thin layer of "shell" is first solidified on the wall of the copper crucible to protect the titanium liquid from being polluted by the crucible material and to insulate heat,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/583F27B14/10
Inventor 毛协民张金龙李迎超
Owner SHANGHAI UNIV
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