Lubrication in hot processing of rare earth metal-transition metal alloy

Abstract

Abstract PURPOSE: To effectively prevent coagulation of an alloy permanent magnet to an inner wall of a die by applying the mixture powder of glass and graphite to the inner surface of the die as the lubricant in manufacturing the permanent magnet by filling the alloy powder of the rare earth metal and the transition metal in the die, and heating the powder and achieving the pressure-forming. CONSTITUTION: The molten alloy having the composition consisting of, by atom, 50-90% Fe or Fe+Co as the transition metal, 10-40% rare earth metal of Nd and Pr, and 0.5% B is super-quenched to pulverize into the amorphous fine powder. The lubricant consisting of the mixture powder of 10-80 vol.% glass powder and 90-20 vol.% graphite powder is sprayed to an inner surface of a hollow cylindrical container manufactured of the heat resistant material such as Mo and WC, the alloy powder is filled in a space formed by upper and lower press dies, and heated to not less than the melting point of glass in the non-oxidizing atmosphere, and pressurized in the vertical direction to manufacture a highly dense, compacting die permanent magnet of high density consisting of transition metal-rare earth element-boron alloy.

Inventors

• 👤 Edowaado Shiitsu Ruisu
• 👤 Andoriyuu Shiyafueru Niiru

Bibliographic Details