采用机械混合与热压烧结相结合的方法制备了纳米氧化镁颗粒及其团聚体弥散分布的密度不小于钢液的复合烧结体。在适当的烧结温度和一定金属粉与纳米氧化镁粉体的混合比例下,纳米氧化镁颗粒及其团聚体在烧结体中以分立的形式存在,纳米氧化镁团聚体的平均尺寸可达1μm。 A composite sintered body of nanometer magnesia particles and its aggregates whose density is not less than that of molten steel is prepared by a combination of mechanical mixing and hot pressing sintering. At the appropriate sintering temperature and the mixing ratio of certain metal powder and nano-MgO powder, the nano-MgO particles and their agglomerates exist in discrete form in the sintered body, and the average size of the nano-magnesia agglomerates can reach 1 μm.