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Composite molybdenum crucible, and preparation method and application thereof

A molybdenum crucible and composite technology, which is applied in the crucible, coating, metal material coating process, etc., can solve problems such as cracking and molybdenum crucible leakage, and achieve corrosion reduction, high temperature corrosion resistance, and uniform microstructure Effect

Inactive Publication Date: 2019-02-12
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the first object of the present invention is to provide a composite molybdenum crucible to solve the problem of leakage or even cracking of the molybdenum crucible caused by the reaction between the molybdenum crucible and liquid rare earth metal or rare earth alloy in the prior art , improve the service life of molybdenum crucible

Method used

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  • Composite molybdenum crucible, and preparation method and application thereof
  • Composite molybdenum crucible, and preparation method and application thereof
  • Composite molybdenum crucible, and preparation method and application thereof

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Embodiment 1

[0052] The invention provides a method for preparing a composite molybdenum crucible, comprising the following steps:

[0053] (1) Prepare a U-shaped matrix pure molybdenum crucible with a hollow bottom and a hollow bottom, the size of which is 300mm in outer diameter, 300mm in height, 20mm in wall thickness, 25mm in bottom thickness, and a density of 9.5g / cm 3 ;

[0054] (2) Assembly of base molybdenum crucible components: evenly lay graphite powder on the bottom of the graphite crucible, lay graphite plate on the graphite powder, place the bottom surface of the base molybdenum crucible on the graphite plate, and keep the other surfaces of the base molybdenum crucible away from the graphite powder. contact, leave a gap between the base molybdenum crucible and the graphite crucible, and then cover the graphite cover to obtain the assembled base molybdenum crucible assembly, specifically as Figure 4 shown;

[0055] (3) High-temperature carburizing treatment: move the assembl...

Embodiment 2

[0059] The invention provides a method for preparing a composite molybdenum crucible, comprising the following steps:

[0060] (1) Prepare a U-shaped matrix molybdenum alloy crucible whose longitudinal section shape is hollow with a bottom. The doping element of the molybdenum alloy crucible is 0.8% (mass percentage) cerium oxide, and its size is 100mm in outer diameter, 100mm in height, and 100mm in wall thickness. 5mm, bottom thickness 5mm, density 9.4g / cm 3 ;

[0061] (2) Assembly of matrix molybdenum alloy crucible components: lay graphite powder evenly on the bottom of graphite crucible, graphite powder is provided with graphite hard felt, matrix molybdenum alloy crucible is placed on graphite hard felt, matrix molybdenum alloy crucible is installed inside and inside Molybdenum alloy crucible with internal protection matching the surface shape and size. Only the outer bottom of the base molybdenum alloy crucible is in contact with the graphite hard felt. The base molybde...

Embodiment 3

[0066] The invention provides a method for preparing a composite molybdenum crucible, comprising the following steps:

[0067] (1) Prepare the U-shaped matrix molybdenum alloy crucible whose longitudinal section shape is hollow with bottom, the doping element of the molybdenum alloy crucible is 1.0% (mass percentage) lanthanum oxide, and its size is 170mm in outer diameter, 110mm in height, and 10mm, bottom thickness 10mm, density 9.6g / cm 3 ;

[0068] (2) Assembly of matrix molybdenum alloy crucible components: lay graphite powder evenly on the bottom of graphite crucible, graphite powder is provided with graphite soft felt, matrix molybdenum alloy crucible is placed on graphite soft felt, matrix molybdenum alloy crucible is installed on the outside The outer protective pure molybdenum crucible with matching surface shape and size, only the outer bottom of the outer protective pure molybdenum crucible is in contact with the graphite soft felt, the matrix molybdenum alloy cruc...

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Abstract

The invention discloses a composite molybdenum crucible, and a preparation method and an application thereof, and belongs to the field of refractory metal product manufacturing. The composite molybdenum crucible is composed of a substrate molybdenum crucible and a molybdenum carbide coating on the surface of the substrate molybdenum crucible, and the outside surface and / or the inside surface of the composite molybdenum crucible is the molybdenum carbide coating. The surface of the composite molybdenum crucible is provided with the compact molybdenum carbide coating generated through in-situ reaction, and the composite molybdenum crucible not only reserves the characteristics that molybdenum is high in strength and is not liable to break at high temperature, but also has the characteristicsthat the high temperature chemical properties of the composite molybdenum are stable and the high temperature corrosion resistance is high. The composite molybdenum crucible is applicable for rare earth metal or alloy with a molten salt electrolysis preparation method, and the service life of the crucible can be prolonged greatly; precious molybdenum resources are saved, and the product quality of the rare earth metal or alloy is improved; and the production cost can be further reduced. The composite molybdenum crucible has the advantages of simple preparation technology, easy control over the thickness of the molybdenum carbide coating, high density of the molybdenum carbide coating, high binding strength with a substrate, high thermal shock resistance, the stable structure and low preparation cost.

Description

technical field [0001] The invention belongs to the field of manufacturing refractory metal products, and in particular relates to a composite molybdenum crucible and its preparation method and application. Background technique [0002] Molybdenum is a refractory rare metal with a melting point as high as 2620°C. It has a strong interatomic bonding force that makes it very strong at room temperature and high temperature; molybdenum has excellent properties such as small expansion coefficient, high electrical conductivity, and good thermal conductivity. Physical properties, at the same time, at room temperature, molybdenum has high chemical stability, does not react with hydrochloric acid, hydrofluoric acid and alkali solution, only dissolves in nitric acid, aqua regia or concentrated sulfuric acid, and is resistant to most liquid metals, non-metallic slag and Molten glass is also quite stable. These excellent physical and chemical properties make molybdenum and its alloys w...

Claims

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Application Information

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IPC IPC(8): C23C8/64C23C8/80C25C3/34B01L3/04
CPCB01L3/04C23C8/64C23C8/80C25C3/34
Inventor 黄广华傅崇伟吴建国夏艳城
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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