Method for preparing square tungsten-yttrium blank

A technology of yttrium nitrate and ammonium paratungstate, which is applied in the direction of coating, etc., can solve the problems of poor control, uneven volatilization of tungsten yttrium billets, and uneven volatilization of tungsten yttrium billets, so as to ensure performance, increase welding penetration, and fracture The effect of arc rate reduction

Active Publication Date: 2009-04-15
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of tungsten yttrium electrode is realized by preparing tungsten yttrium billet. In the past, tungsten yttrium billet was directly added to metal tungsten powder for batch mixing to obtain tungsten yttrium coated powder, and then pressed to obtain tungsten yttrium billet. In practice, evaporation pots and ovens are often used to prepare tungsten-yttrium-coated powders, but because this process cannot prepare uniform tungsten-yttrium-coated powders, resulting in the use of tungsten-yttrium-coated powders. billet is not unifo

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  • Method for preparing square tungsten-yttrium blank

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Example Embodiment

[0022] Example one

[0023] The embodiment of the present invention provides a method for preparing tungsten-yttrium square billet: the tungsten-yttrium square billet with good uniformity can be prepared, and the processing flow of the method is as follows: figure 1 As shown, specifically including:

[0024] a. Mix yttrium nitrate with water to make an aqueous solution of yttrium nitrate with a concentration of 0.8~1.8g / ml, and spray the surface of the ammonium paratungstate APT coated in the doping machine evenly at a flow rate of 22~25ml / min. At the same time, the ammonium paratungstate (APT) mixed with yttrium nitrate aqueous solution is heated, dried, mixed and stirred, and then dried to obtain tungsten-yttrium coated powder; wherein, the heating, drying, mixing, and stirring are specifically mixed with steam at a temperature of 100~105℃ The stirred yttrium nitrate aqueous solution and ammonium paratungstate (APT) are heated and dried with a steam pressure of 0.3Mpa. After 0.8...

Example Embodiment

[0029] Example two

[0030] This embodiment provides a method for preparing a tungsten-yttrium billet, which is specifically as follows:

[0031] Preparation of tungsten and yttrium coated powder:

[0032] The tungsten yttrium coating prepared by mixing yttrium nitrate and water with a concentration of 1.5g / ml yttrium nitrate aqueous solution and solid raw material APT, mixed doping and heating and drying in the doping machine by spraying Powder, specifically:

[0033] (1) Dissolve 24.6 kg of yttrium nitrate in deionized water to prepare an aqueous solution of yttrium nitrate with a concentration of 1.5 g / ml;

[0034] (2) Put 450Kg APT into the doping machine and spray the prepared yttrium nitrate aqueous solution into the doping machine to coat the surface of the APT in a spray mode, and perform doping mixing and stirring;

[0035] (3) Control the flow rate of spraying: 22-24ml / min, and spraying time: 40 minutes to 60 minutes;

[0036] (4) After spraying the liquid, continue to s...

Example Embodiment

[0038] Example three

[0039] This embodiment provides a method for preparing a tungsten-yttrium billet, which is specifically as follows:

[0040] Preparation of tungsten and yttrium coated powder: The tungsten and yttrium coated powder is prepared by using yttrium nitrate aqueous solution prepared from yttrium nitrate and solid raw material APT, doping in a doping machine, spray drying and other processes, specifically:

[0041] Dissolve 23-24 kg of yttrium nitrate in deionized water to prepare an aqueous solution of yttrium nitrate with a concentration of 1.7g / ml. In practice, the concentration of the aqueous solution of yttrium nitrate can also meet the requirements of the tungsten and yttrium billets corresponding to the prepared tungsten and yttrium electrode grades. To prepare;

[0042] Put 450Kg APT into the doping machine and spray the prepared yttrium nitrate aqueous solution into the doping machine in a spray mode to coat the surface of the APT. When spraying, vacuum eq...

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Abstract

The invention discloses a method for preparing tungsten-yttrium square billets, which comprises the following steps: a. dispersing yttrium nitrate aqueous solution in a spraying mode evenly and coating the yttrium nitrate aqueous solution on the surface of ammonium paratungstate, and performing mixing agitation, heating, and drying at the same time to obtain tungsten-yttrium coating powder after drying; and b. performing primary and secondary reductions, compaction, presintering and incipient fusion sintering on the tungsten-yttrium coating powder to be prepared into the uniform tungsten-yttrium square billets with metallicity, wherein the incipient fusion sintering process comprises that the temperature is increased for 10 to 30 minutes and the temperature is kept for 20 to 50 minutes, and the electric current in the process of keeping the temperature is between 2,500 and 4,000 amperes. The method has a simple process and prepares the tungsten-yttrium coating powder by adopting the spraying mode, thus the even distribution degree of elements added to square billet raw materials is ensured, and the tungsten-yttrium coating powder with comparatively even dispersion; besides, the process of the subsequent incipient fusion sintering is controlled to raise the temperature for 10 to 30 minutes, keep the temperature for 20 to 50 minutes, and keep the electric current in the process of keeping the temperature between 2,500 and 4,000 amperes, thus each point of the prepared tungsten-yttrium square billets is volatilized evenly; and under the cooperation of the method and the incipient fusion sintering, the prepared tungsten-yttrium square billets have good evenness.

Description

technical field [0001] The invention relates to the preparation technology of tungsten yttrium billets, in particular to a method for preparing uniform tungsten yttrium billets. Background technique [0002] Tungsten electrode material is one of the key materials used in TIG and PLSMA technology. There are many types of tungsten electrodes currently used in industry. For example: cerium tungsten electrode, lanthanum tungsten electrode, thoriated tungsten electrode, etc. Among the widely used tungsten electrodes, thoriated tungsten electrodes show better performance. However, since thorium is a radioactive substance, it will cause cumulative radioactive hazards to the human body and radioactive pollution to the environment. Therefore, the currently developed tungsten-yttrium electrode can replace the radioactive thoriated tungsten electrode in the technical field of TIG and PLSMA. [0003] The research and development of new electrode materials and the actual application r...

Claims

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Application Information

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IPC IPC(8): B22F3/16B22F1/02
Inventor 李炳山巫正瑜张松梧邓松林王芦燕徐振华
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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