JPS5873734A - Manufacture of rare earth metallic alloy - Google Patents

Abstract

PURPOSE:To obtain a rare earth metallic alloy at a low cost by a simple process, by mixing a rare earth fluoride, metallic calcium and base metarllic powder, press-molding them, and heating them in an inert gas atmosphere. CONSTITUTION:A pellet is manufactured by mixing a rare earth fluoride such as yttrium fluoride, etc., and base metallic powder such as metallic calcium, copper, etc., and press-form them. This pellet is put into a graphite crucible, etc., is heated to a melting point or above of a base metal in an inert gas atmosphere, and is made to react. By this method, an excellent rare earth metallic alloy is obtained by one process.

Description

[Detailed description of the invention] The present invention relates to a method for producing rare earth metal alloys.

Conventional methods for producing rare earth metal alloys include adding rare earth metals to a molten base metal to form an alloy.

On the other hand, rare earth metals are produced using rare earth oxides or halides as raw materials at temperatures above the melting point of the rare earth metals by molten salt electrolysis or metal reduction methods such as calcium and 7 um.

This method requires two steps: a step of producing a rare metal and a step of producing a rare earth metal alloy.

The process of manufacturing rare earth metals requires high temperatures, making the process complex and economically expensive.

According to the present invention, a rare earth fluoride can be reduced with metallic calcium to form a rare earth metal, and at the same time an alloying reaction with a base metal can be carried out.

A rare earth metal alloy can be obtained through a simple process and at low cost. Furthermore, for rare earth metals with a high point, the reduction alloying reaction must be carried out at a temperature below the melting point.

It also has a large energy saving effect compared to conventional methods. In the present invention, rare earth fluoride, metallic calcium, and base metal powder are mixed, pressure molded using a die to create pellets, and in order to prevent oxidation, the melting point of the base metal is This is a method of obtaining a rare earth metal alloy in one step by heating to the above temperature.

The rare earth fluoride used in the present invention may be either a mixed rare earth or a separated rare earth.

Next, examples will be shown, but the present invention is not limited to these.

Example 1 85 g of yttrium fluoride, 60 g of metallic calcium particles, and 920 g of copper powder were mixed and formed into pellets with a diameter of 7-9 and a height of 5 m using a molding machine.

Place this pellet in a graphite crucible.

The reaction was carried out in an argon atmosphere by high-frequency induced taro heating at 900° C. for 1 hour, and then at 1.250° C. for 2 hours.

After diving, the slug and alloy part were separated to obtain 950 g of copper-yttrium alloy.

The proportion of yttrium in this alloy was 4.8% by weight, and 90% of the yttrium in the raw material yttrium fluoride was alloyed.

Example 24 85 g of a mixed fluoride of praseodymium and neodymium, 50 g of metallic calcium, and 800 g of copper powder were mixed and formed into pellets with a diameter of 7 cIn and a height of 4.5 crs using a molding machine. This pellet was placed in a graphite crucible and reacted at 850° C. for 2 hours and then at 1.250° C. for 1 hour under high-frequency induction heating in an argon atmosphere. After cooling, the slag and alloy portion were separated to obtain 870 g of alloy.

The total proportion of praseodymium and neodymium in this alloy is 6
1% by weight, and 74% of praseodymium and neodymium in the raw material fluoride were alloyed.

Example 3 45 g of yttrium fluoride, 30 g of metallic calcium particles, and 400 g of lead powder were mixed and molded into a mold with a diameter of 7 crn and a height of 2
cm pellets.

This pellet was placed in a graphite crucible and reacted at 900° C. for 2 hours by high frequency induction heating in an argon atmosphere. After cooling, the slag and alloy portion were separated to obtain 420 g of lead yttrium alloy.

The proportion of Nakajima yttrium in this alloy was 51% by weight, and 80% of the yttrium in the raw material yttrium fluoride was alloyed.

Example 4 45 g of yttrium fluoride, 30 g of metallic calcium particles, and 400 g of iron powder were mixed and molded into a mold with a diameter of 7 crn and a height of 2
．． It was made into a 5 cm pellet.

The pellets were placed in an aluminum crucible and heated to 950°C for 1 hour under high-frequency induction heating in an argon atmosphere, and then heated for 1 hour.
．． The reaction was carried out at /+OO°C for 1 hour. After cooling, the slag and alloy portion were separated to obtain 415 g of iron-yttrium alloy.

The proportion of yttrium in this alloy was 5.6% by weight, and 85% of the yttrium in the raw material yttrium fluoride was alloyed.

Example 5 Mixed dilute fluoride (60% yttrium, 40% other heavy rare earth)
%), 30 g of metallic calcium particles, and 400 g of copper powder were mixed, and molded into a diameter of 7 cm using a molding machine.

It was made into a pellet with a height of 2 m.

This pellet is placed in a graphite crucible and subjected to high frequency induction heating in an argon atmosphere! l) Reacted at 850°C for 1 hour 1. Reacted at 250°C for 1 hour. After cooling, the slag and alloy portion were separated to obtain 455 g of alloy.

The proportion of mixed rare earth in this alloy was 64 percent by weight, and 87 percent of the rare earth in the raw material fluoride was alloyed.

Example 6 10 g of scandium fluoride, 10 g of metallic calcium, and 200 g of copper powder were mixed and molded into a mold with a diameter of 7 crn.

Pellet Toshita with a height of 1crn.

The pellets were placed in a graphite crucible and reacted in an argon atmosphere by high frequency induction heating at 850°C for 1 hour and then at 1.200°C for 1 hour.

After cooling, the slag and alloy portion were separated to obtain 200 g of alloy.

The scandium in this alloy was 19% by weight, and 86% of the scandium in the raw fluoride was alloyed.

Claims (1)

[Claims] A method for producing rare earth metal alloys by heating and reacting a mixture of rare earth fluoride, metallic calcium, and base metal powder to a temperature above the melting point of the base metal in an inert gas atmosphere.