Molybdenum material and method for manufacturing the same

Abstract

A molybdenum material having a diameter of 75 mm or more and a length of 250 mm or more, and having a relative density of 99.5% or more.

1 . A molybdenum material having a diameter of 75 mm or more and a length of 250 mm or more, and having a relative density of 99.5% or more. 
     
     
         2 . The molybdenum material according to  claim 1 , wherein the relative density is 99.9% or more. 
     
     
         3 . The molybdenum material according to  claim 1 , that contains 99.9% by mass or more of molybdenum. 
     
     
         4 . The molybdenum material according to  claim 1 , that contains 0.3% by mass or more and 1.5% by mass or less of titanium, 0.03% by mass or more and 0.1% by mass or less of zirconium, and 0.01% by mass or more and 0.3% by mass or less of carbon, with a balance composed of molybdenum and unavoidable impurity. 
     
     
         5 . A method for manufacturing a molybdenum material, comprising:
 (1) preparing a first core alloy having an outer diameter of 40 mm or less by hot isostatic pressing;   (2) disposing the first core alloy in a tube having a diameter larger than that of the first core alloy;   (3) disposing molybdenum powder in the tube around the first core alloy and subsequently compressing the tube by hot isostatic pressing; (4) removing the compressed tube to form a second core alloy having a diameter larger than that of the first core alloy; and repeating the steps (2) to (4) to obtain a molybdenum material according to  claim 1 .