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A method for complete passivation of tantalum powder after heat treatment

A complete technology of tantalum powder, applied in the field of complete passivation of tantalum powder after heat treatment, can solve the problems of intense oxidation of tantalum powder, ignition, incomplete passivation of tantalum powder, etc., to reduce the loss of tantalum powder, reduce environmental pollution, and be beneficial The effect of operator health

Active Publication Date: 2019-01-15
江门富祥电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The prior art has related tantalum powder, niobium powder passivation such as Chinese patent CN102181818B, WO2012126143ACN has provided the tantalum powder passivation method, promptly carries out passivation in the heat treatment furnace, yet, because the tantalum powder particle in the crucible and the crucible The wall and the powder particles are in contact with each other, and a considerable part of the particle surface is not in contact with the oxygen-containing gas during the passivation process, and no oxide film is formed, that is, the tantalum powder is not completely passivated, which has a large specific surface area. tantalum powder, the problem is particularly serious
Even if the tantalum powder has been passivated in the furnace after heat treatment, after the tantalum powder and the crucible containing the tantalum powder are taken out of the furnace, the agglomerated tantalum powder is stripped from the crucible, crushed and sieved During the process, the surface of the tantalum powder that has not yet formed an oxide film is oxidized in contact with the air, and the temperature rises rapidly. In the atmospheric environment, due to the sufficient oxygen in the air, uncontrollable oxidation occurs, which will also cause the tantalum powder Serious accidents of intense oxidation and even fire

Method used

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  • A method for complete passivation of tantalum powder after heat treatment
  • A method for complete passivation of tantalum powder after heat treatment
  • A method for complete passivation of tantalum powder after heat treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Coagulation heat treatment of tantalum powder

[0068] The tantalum powder prepared by reducing potassium fluorotantalate with sodium has a specific surface area of ​​0.61 cm after washing with water, pickling and drying. 2 / g, oxygen content is that the tantalum powder 121 of 3060ppm is packed into tantalum crucible 122 after granulation grouping, the above-mentioned crucible that tantalum powder is housed is packed in the vacuum heat treatment furnace again and carries out condensation heat treatment according to prior art, rises to 1380 ℃, keep warm for 30 minutes, then power off and cool down to 28°C, pass in a mixed gas composed of argon and air to passivate the tantalum powder, the temperature of the tantalum powder after passivation is 27°C, put the tantalum powder together with The crucible 122 of powder 121 is removed from the heat treatment furnace. These heat-treated tantalum powders are divided into two parts and processed according to the following two met...

Embodiment 2

[0075] Tantalum powder deoxidation heat treatment:

[0076] With heat-treated tantalum powder, the specific surface area is 0.41m 2 / g, the oxygen content is 4050ppm, in the tantalum powder, mix the magnesium powder of 1.5% of tantalum powder weight, the above-mentioned mixed powder is housed in the tantalum crucible and then packs in the deoxidation heat treatment furnace, carries out deoxidation heat treatment according to the patent number CN102965525B method, at 930 ℃ for 3 hours, and exhausted to remove magnesium, lower the temperature to 15 ℃ for passivation, after passivation, the tantalum powder is released from the furnace at 27 ℃. The tantalum powder after these deoxidation heat treatments are divided into two parts and processed according to the following two methods:

[0077] Tantalum powder is fully passivated:

[0078] A part of the tantalum powder prepared by the above-mentioned deoxidation heat treatment is processed according to the method of the present inv...

Embodiment 3

[0083] Coagulation heat treatment of tantalum powder:

[0084] The tantalum powder prepared by reducing potassium fluorotantalate with sodium has a specific surface area of ​​1.01m after washing with water, pickling and drying2 / g, the tantalum powder with an oxygen content of 7560ppm is put into tantalum crucible 10 li after granulation and agglomeration. Minutes, then cut off the power and cool down to 20°C, pass in a mixed gas composed of argon and air to passivate the tantalum powder, the temperature of the tantalum powder after passivation treatment is 25°C, put the tantalum powder together with the crucible containing the tantalum powder from Take it out of the heat treatment furnace. The tantalum powder after these condensation heat treatments is divided into two parts and processed according to the following two methods:

[0085] Tantalum powder is fully passivated:

[0086] A part of the tantalum powder prepared by the above-mentioned heat treatment is processed acc...

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Abstract

The invention relates to a method for completely passivating tantalum powder after heat treatment, which is characterized in that the agglomeration of tantalum powder heat-treated and passivated in a vacuum heat treatment furnace together with a crucible containing tantalum powder is placed in a sealable container, Under the controllable oxygen concentration, the tantalum powder agglomerates are stripped from the crucible, crushed and sieved to completely passivate the tantalum powder. The invention also provides a device for completely passivating tantalum powder. The oxygen content of the tantalum powder prepared by the method of the invention is low, and no fire accidents will occur when the tantalum powder is stripped from the crucible, crushed and sieved.

Description

technical field [0001] The invention relates to the field of tantalum metal treatment, more specifically, the invention relates to a method and a device for completely passivating tantalum powder after heat treatment. Background technique [0002] Rare and precious metal tantalum has high melting point, low vapor pressure, good cold working performance, high chemical stability, strong resistance to liquid metal and acid and alkali corrosion, and high dielectric constant value of surface oxide film. Metal tantalum and its alloys are important functional materials. It is widely used in the fields of electronics, integrated circuits, steel, metallurgy, chemical industry, cemented carbide, atomic energy, aerospace and strategic weapons and other industries; due to the good biocompatibility and high biological activity of tantalum, tantalum and its alloys It is also widely used in the field of medical device technology. High purity is required in tantalum applications, especiall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00
CPCB22F1/145
Inventor 郑浩宇朱德忠廖志刚
Owner 江门富祥电子材料有限公司