STUDY ON HIGH DENSITY COMPACTION OF POWDER USING EXPLOSIVE COMPRESSION

(1)采用倾斜轴对称爆炸法对铝粉、铜粉和铁粉进行了动态压制。通过改变炸药的爆压，考察了金属的硬度和熔点对炸药压实的影响。生产出比重为98%的铝、铜和铁压坯。最佳压坯的爆轰压力随金属硬度和熔点的升高而增大。(2)改变Co基粉末的粒度以检查压实时的粒度。当使用S尺寸的粉末（粒径<10 μ m）时，生产高质量压坯的工艺参数比M尺寸（从75 μ m到100 μ m）和L尺寸（从125 μ m到150 μ m）粉末的工艺参数限制得多。特别地，L尺寸的粉末产生了仅具有2.5%孔隙率并表现出优异的颗粒间结合的压块。建议爆炸压制时粉末的粒度应控制在100 μ m。(3)采用斜轴对称爆炸技术对钴基合金和Cr_7C_3粉末的混合粉末进行了压制。混合粉末共混物的相对密度大于97%，Cr_7C_3粉末不破碎。

(1) Aluminium and copper and iron powders were dynamically compacted using a clindrical axisymmetric explosion technique. The detonation pressure of explosive were varied to examine the effects of hardness and melting point of their metals on compactiom. The aluminium, copper and iron compacts with a specific density of 98% were produced. The detonation pressure of optimum compact were increased with hardness and melting points of metals.(2) The particle size of Co-based powders was varied to examine particle size on compaction. When using S-sized powder (with particle diameters <10mum), the processing parameters which produced high quality compacts were much more restrictive than those for M-sized (from 75mum to 100mum) and L-sized (from 125mum to 150mum) powders. In particular, the L-sized powder produced a cmppact which had only 2.5% porosity and exhibited excellent inter-particle bonding. Is is recommended that the particle size of powders should be 100mum during explosive compaction.(3) The mixing powders of Co-based alloy and Cr_7C_3 powders were compacted using a clindrical axisymmetric explosion technique. The relative density of comoact for the mixing powders was more than 97% without shatter of Cr_7C_3 powders.