Cobalt-carbon intermediate alloy and preparation method thereof

The invention discloses a preparation method and an evaluation method of a cobalt-carbon intermediate alloy. The main technical requirements of the cobalt-carbon intermediate alloy are as follows: less than or equal to 4% of carbon, less than or equal to 0.1% of silicon, less than or equal to 0.1% of iron, less than or equal to 0.05% of phosphorus, less than or equal to 0.2% of oxygen, less than or equal to 0.05% of nitrogen, less than or equal to 0.05% of sulfur and the balance of cobalt. The cobalt-carbon intermediate alloy prepared through the method comprises the innovative design of an alloy component design link, material distribution, alloying treatment, casting, sampling analysis and structure evaluation and a plurality of procedures, and therefore it is guaranteed that a block material with the carbon content evenly distributed (segregation of C is controlled to be within +/-0.3% of ingredient components) is prepared; and the prepared alloy is confirmed to be uniformly distributed in the forms of car