UA51917A - Method for obtaining titanium powder - Google Patents

Abstract

Method for making titanium powder by melting an electrode formed of titanium-containing charge with magnium additive. At that, base of titanium-containing charge is the product of magnesium-thermal restoration of titanium, with vacuum separation and preliminary milling.

Description

Description of the invention

The invention relates to titanium powder metallurgy and can be used for the production of spherical 2 titanium powders-granules, which are the starting material for the manufacture of filters, structural parts and other products.

The well-known "Method of obtaining titanium powder", J.S. Мо890656, В22Е9/14, 3.16.05.80, which includes the melting of an electrode from a titanium charge containing spongy titanium and magnesium (0.5 - 1095). Titanium is sprayed with magnesium vapor and hardens in the form of spherical particles during free fall.

Sponge titanium is used as a raw material for obtaining titanium powder, which is expensive, besides, the process of obtaining it is very energy-intensive. The need for its preliminary grinding to a grain size of 25 mm (mostly up to 12 mm), the large consumption of magnesium granules, which are introduced into the charge in the amount of up to 1095, also increase the value of the powder.

The process of spraying titanium with magnesium vapors and the granulometric composition of the powder are not sufficiently stable due to the uneven distribution of magnesium in the volume of the charge.

The invention is based on the task of increasing the stability of the spraying process due to the use of a titanium charge with a uniform composition, obtaining a more homogeneous product in size and significantly reducing the cost of electricity for the production of titanium powder.

The problem is solved by the fact that in the known method of obtaining titanium powder, which includes the melting of an electrode made of titanium charge with magnesium additive, the basis of the titanium charge is the product of magneithermal reduction of titanium, subjected to vacuum separation at 80 - 9095 and previously crushed to a size of 5 - 7 Ohm. Magnesium in the amount of 0.3 - 5905 is added to the base of the charge, crushed to a size of 5 - 25 mm.

The use of the product of magneithermal reduction of titanium, subjected to vacuum separation at 80-90 95, as the basis of the titanium charge reduces the operating time of vacuum separators by 5095 and provides significant savings in electricity. When using the product subjected to vacuum separation "x 8095", the melting process of the electrode is not stable, the resulting powder has an increased content of impurities and an uneven granulometric composition. When using the product subjected to vacuum separation » 9095, the yield of powder fractions decreases and the consumption of electricity increases significantly. The partially separated product contains residual magnesium in the amount of 0.1 - 0.395 and magnesium chloride in the amount of 1 - 595. Magnesium and magnesium chloride when melting the unseparated material manifest themselves as active atomizing agents because at the melting temperature of titanium they have a vapor pressure many times exceeding pressure of titanium vapors

The partially separated product of magnethermal recovery contains magnesium and magnesium chloride mainly in "-- closed or open small pores evenly distributed throughout the volume of the material, which ensures the stability of the spraying process. at

The coarseness of the obtained particles depends on the degree of separation of the product. If it is necessary to obtain powders of smaller fractions, magnesium granules with a size of 1 - 5 mm in the amount of 0.3 - 595 from the mass of the charge are added to the charge.

The method is carried out as follows. "

After removal from the reactor, the partially separated product of the magneithermal reduction of titanium is ground to a size of 25 - 7 Ωm. Then a pressed electrode is made from it and melted. In the process of melting, titanium is sprayed with magnesium and magnesium chloride vapors, hardens in the form of spherical particles at

From" free fall in a chamber of sufficient height.

When using a charge with additionally introduced magnesium to form the electrode, the raw material is crushed to a size of 5 - 25 mm. In the process of forming the electrode, 0.3 - 595 magnesium granules are added in portions that ensure their uniform distribution in the electrode. i-th Example Mo 1 (according to the prototype). - An electrode weighing 2 kg with a diameter of 8 mm pressed from spongy titanium with a size of 12 mm and magnesium granules with a size of 2 mm taken in the amount of 596 was melted and sprayed in a vacuum arc furnace. 1.bkg of spherical powder was obtained. The granulometric composition of the powder is as follows: - 70 - 1.0 4 0.Bmm 43.496; - 0.5 4 0.315mm 20.296; - 0.315 - 0.2 mm 12.290; - 0.2 mm - 0.09 mm 17.9; - less than 0.09mm 5.495. "m Example Mo 2.

An electrode with a mass of kg, a diameter of 8 Ohm, pressed from the unseparated product of magnethermal reduction (9095) with a grain size of 12 - 5 mm, in which the content of magnesium and magnesium chloride is 3.795, was melted and 29 atomized in a vacuum arc furnace. 1.4 kg of spherical powder was obtained, the granulometric composition of of the following powder: - 1.0 u- 0.5 mm 29,390; - 0.5 - 0.315mm 24490; - 0.315 mm - 0.2 mm 15.790; - 0.2 mm - 0.09 mm 19.395; less than 0.09 11.3905.

Example 3. 60 An unseparated product of magnesium thermal recovery (as in example 2) with a grain size of 5-12 mm was taken for the electrode, which contains 3.795 magnesium and magnesium chloride with the addition of 0.395 magnesium granules. 1.6 bkg of powder with the following granulometric composition was obtained: - 1.0 u- 0.5 mm 25.2906; - 0.5 mm - 0.315 mm 23.8 905; - 0.315 - 0.2 mm 16.1905; - 0.2 mm - 0.09 mm 29.995; less than 0.09mm 5.095. because Example 4.

The electrode is pressed from the product of magneithermal recovery separated by 8095, with a size of 5 - 12 mmM with a content of magnesium and magnesium chloride of 3.295 with the addition of 595 magnesium granules. 1.56 kg of powder with the following granulometric composition was obtained: - 1.0 and 0.5 mm 14.3; - 0.5 - 0.315mm 16.9; - 0.315 - 0.2 mm 142905; - 0.2 mm - 0.09 mm 48.495; less than 0.09mm 3.290.

From the above examples of the method of obtaining titanium powder according to the prototype and according to the application, it can be seen that the use of the product of magneithermal reduction, subjected to vacuum separation at 80 - 9095, as the basis of the titanium charge, allows the use of larger starting material (5 - 7 Ω). This contributes to the 7/0 significant reduction in power consumption (20 - 3090) compared to the prototype. In addition, the addition of magnesium granules, which are used as an additional spraying agent, is reduced. Implementation of the claimed method ensures the stability of the spraying process.

Claims (2)

The formula of the invention 1. The method of obtaining titanium powder by melting an electrode formed from a titanium-containing charge with the addition of magnesium, which is distinguished by the fact that the basis of the titanium-containing charge is the product of magneithermal reduction of titanium, subjected to vacuum separation at 80-90 95 and previously crushed to a size of 5-70 mm. 2. The method according to claim 1, which differs in that magnesium granules in the amount of 0.3-5 are added to the base of the charge crushed to a size of 5-25 mm in the process of forming the electrode. 9. Official Bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2002, M 12, 15.12.2002. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. « cha «- (o) «- IS c) - with . and? 1 - se) - 50 that 60 b5