CRUCIBLE MADE OF TUNGSTEN-MOLYBDENUM ALLOY, METHOD FOR PRODUCING THE SAME, AND METHOD FOR PRODUCING SAPPHIRE SINGLE CRYSTAL

摘要

PROBLEM TO BE SOLVED: To provide a crucible made of a tungsten-molybdenum alloy excellent in high temperature strength, particularly, in the high temperature strength of a corner part connecting a bottom part and a side wall part.SOLUTION: Provided is a bottomed cylindrical crucible 1 made of a tungsten-molybdenum alloy, made of a tungsten-molybdenum alloy composed of tungsten of 1 to 60 mass%, and the balance molybdenum, and having an upper opening part obtained by connecting a bottom part 2 and a side wall part 3 via a corner part 4, and the average crystal grain size is 30 to 70 m.