Molybdenum-niobium alloy plate target material processing technique

摘要

The processing technology of a molybdenum-niobium alloy plate target shall be implemented as follows: (1) mix: divide a certain amount of molybdenum powder and niobium powder into, at least, three small portions, and mix each portion of them into a mixed powder. After several rounds of mixing and sieving, a mixed alloy powder will be achieved from a plurality of mixed powders; divide the mixed alloy powder into three portions and mix each portion with other materials, a uniform alloy powder will be obtained by mixing the three portions together; (2) shaping: the alloy compact, which is formed after isostatic pressing, shall be sintered in a high-temperature intermediate frequency furnace for at least 3 hours under protection of hydrogen. The sintering temperature includes three zones, i.e. 0° C.˜800° C., 800° C.˜1600° C. and 1600° C.˜2000° C., and the alloy compact shall be sintered in each of the three temperature zones. An alloy compact shape will be formed in the end; (3) forging and rolling: after the forging and densification under a temperature of 1200° C.˜100° C., the alloy compact is rolled into the plate for material preparation under a heating temperature of 1500° C.˜1600° C.; (4) finish machining: the final molybdenum-niobium alloy plate target is achieved by cutting, accurate grinding and machining. The blank of the invention is the refined grain with a relatively uniform size.

主权项

1. A process of preparing a molybdenum-niobium alloy plate target comprising the steps of:
(1) obtaining a certain amount of molybdenum powder and niobium powder and dividing said molybdenum powder and niobium powder into at least three small portions, mixing each portion of said molybdenum powder and niobium powder to obtain a mixture of portions of molybdenum powder and niobium powder; after several rounds of mixing and sieving, multiple said mixtures of portions of molybdenum powder and niobium powder are combined to obtain a mixture alloy powder of molybdenum and niobium, dividing said mixed alloy powder into three portions and mixing each portion with each other to obtain an uniform alloy powder; (2) placing said uniform alloy powder under isostatic pressing to obtain an alloy compact which is sintered in a high-temperature intermediate frequency furnace for at least 3 hours under the protection of hydrogen, said sintering temperature includes three zones consisting of 0° C.˜800° C., 800° C.˜1600° C. and 1600° C.˜2000° C., said alloy compact being sintered in each of the three temperature zones; (3) forging and rolling said alloy compact under a temperature of 1200° C.˜1400° C., rolling said alloy compact under a heating temperature of 1500° C.˜1600° C. into a plate for further material preparation steps comprising cutting, accurate grinding and machining.