“难熔金属”通常指的是具有体心立方品格的元素如、钼、钨、钽。密排六方晶格的铼和体心立方晶格的钒也包括在内。所有这些金属有一个共同的特点即具有非常高的熔点。这六种元素中,钒的熔点最低;为2175K,钨的熔点最高,为3680K。钽、钨和 铼还具有高密度。由于它们具有极高的熔解温度,自然它们被用作高温结构材料的基硅材料;然而,这些金属在不及其熔点一半 “Refractory metals” usually refers to elements that have a body-centered cubic character such as molybdenum, tungsten, tantalum. Rhenium in the hexagonal lattice and vanadium in the body-centered cubic lattice are also included. All of these metals have a common feature that has a very high melting point. Of these six elements, vanadium has the lowest melting point; for 2175K, the highest melting point of tungsten is 3680K. Tantalum, tungsten and rhenium also have a high density. Because of their extremely high melting temperatures, they are naturally used as a base silicon material for high-temperature structural materials; however, these metals are not as good as half their melting point