发明了一种高纯难熔金属块体的制备方法，将简单、灵活的包覆料包裹钨合金物料，经过真空烧结得到外表面完全被包覆料覆盖的烧结物，然后去除烧结物外表面的包覆料，即得到无碳污染的高纯块体。过程可在普通高温烧结设备中完成，适用于高纯度需求的难熔金属块体的高效低成本烧结成型。

Invented a method for preparing a high-purity refractory metal block. A simple and flexible coating material is wrapped around a tungsten alloy material. After vacuum sintering, a sintered product whose outer surface is completely covered by the coating material is obtained, and then the outer surface of the sintered product is removed. The coating material can obtain a high-purity block without carbon pollution. The process can be completed in ordinary high-temperature sintering equipment, which is suitable for high-efficiency and low-cost sintering and molding of refractory metal blocks with high-purity requirements.