Preparation method of nickel-molybdenum intermediate alloy

The invention discloses a preparation method of an nickel-molybdenum intermediate alloy. The method comprises the following steps of a, taking 30%-60% of nickel and 40%-70% of molybdenum according tothe weight ratio; b, filling a crucible with a part of nickel, filling the crucible with carbon, then filling the crucible with the rest nickel, and filling an alloy bin with molybdenum, a small amount of the nickel-magnesium alloy and the carbon; c, vacuumizing the crucible to be less than or equal to 5 pa, carrying out heating and smelting, heating at the speed of 2-5 kw/5 min to 25 kw when thetemperature is below 25kw, then heating at the speed of 5 kw/10 min to 30kw; carrying out refining for 10 minutes, carrying out standing for 5 minutes until the air pressure in the crucible reaches 0.07 Mpa, adding molybdenum in the alloy bin into the crucible, raising the power to 20 kw, carrying out refining for 4 minutes and standing for 1 minute after the materials in the crucible are completely melted until the liquid