钼粉形貌对钼板性能的影响

分别选用2种不同形貌的钼粉,在相同的压制、烧结和轧制工艺下制备出0.5 mm和0.2 mm钼板,其中0.5 mm厚钼板采用直轧方式,0.2 mm厚钼板采用交叉轧制方式。对这2种钼粉制备的烧结板坯的显微组织以及钼板的力学性能和退火组织进行了比较分析。结果表明,钼粉的形貌对钼板的性能有很大的影响,相比常规颗粒大小不均匀、团聚较为严重的钼粉,具有颗粒大小均匀、分散性好、无团聚的钼粉烧结板坯晶粒大小均匀,致密性好,加工出的钼板具有较高的力学性能和高温性能,交叉轧制的钼板表现出了较好的各向同性。

EFFECT OF MOLYBDENUM POWDER MORPHOLOGY ON PROPERTIES OF MOLYBDENUM SHEET

Using two kinds of molybdenum powder with different morphology as raw materials,Mo sheets with thickness 0.5 mm and 0.2 mm respectively were prepared by the same process of pressing,sintering and rolling.The rolling way of Mo sheets with 0.5 mm thickness was direct rolling and that of Mo sheets with 0.2 mm thickness was cross rolling.The microstructure of Mo sintering slabs was observed by optical microscope and SEM.The mechanical properties and annealed structure of Mo sheets were compared and analyzed.The results showed that the molybdenum powder morphology had great influence on the properties of Mo sheets.Compared with that from the molybdenum powder with inhomogeneous particles and aggregation,the Mo sintering slabs prepared by the the molybdenum powder with homogeneous particles,non-aggregation and better dispersion exhibited homogeneous grain structure and better compactness.These Mo sheets also showed favorable mechanical properties and high-temperature performances,and the cross-rolling Mo sheets exhibited a good isotropy.