PURPOSE: To easily manufacture an amorphous alloy having high crystallization temp. and combining high strength with high corrosion resistance, by spraying a molten alloy having a specific composition consisting of Ta, W, and B onto the surface of a rapidly rotating roll through a water-cooled nozzle so as to carry out rapid solidification.
CONSTITUTION: The alloy 2 as raw material represented by a formula (Ta1-xWx)yBz [where the symbols (x), (y) and (z) stand for 0.01W1, 0.7W0.9, and 0.1W0.3, respectively] is melted in a water-cooled metallic crucible 1 by means of plasma from a plasma torch 5. Subsequently, rods 6 are pulled right and left to open the crucible 1, so that molten alloy is dropped into a water-cooled nozzle 3 made of metal or high-m.p. material such as BN, etc. At this time, a gas is previously introduced from a gas- introducing hole 7 into the upper chamber and also the lower chamber is evacuated by means of a vacuum pump 8. By using the resulting difference in pressure between both chambers, the above molten alloy is sprayed through the nozzle 3 onto the surface of a cooling roll 4 made of copper, etc., rapidly rotating at a surface speed of ≥90m/sec to undergo rapid solidification. In this way, a Ta-W amorphous alloy excellent in mechanical properties, corrosion resistance, etc., and having high crystallization temp. can be obtained.
KUBO YOSHIMI
IGARASHI HITOSHI
| JPS5499035A | 1979-08-04 |