【作者】 高阿婷； 朱德贵；

【Author】 GAO A-ting,ZHU De-gui (Key Laboratory of Advanced Technologies of Materials,Ministry of Education, Southwest Jiaotong University,Chengdu 610031,China)

【机构】 西南交通大学材料先进技术教育部重点实验室；

【摘要】 为了在地面上模拟高速运动的太空碎片对航天器的影响,需用一种密度梯度飞片材料撞击二级飞片,使其接近太空碎片的速度。介绍了以金属钨和镁粉末为原料,按照设计好的配比混合粉末,逐层铺叠压制成型后,用热等静压烧结技术制备出W-Mg密度梯度飞片材料。通过SEM观察表面形貌可以看到从飞片的富镁侧到富钨侧的形貌变化,通过观察断口形貌可以看出烧结后规则形状的钨颗粒被镁包裹粘接在一起,通过电子探针进行能谱分析可以看出沿着厚度方向,W-Mg含量呈现梯度化趋势。更多还原

【Abstract】 In order to simulate the influence of high-speed movement space debris on the spacecraft,a graded density impactor is needed to collide with the secondary flier-plate,so that its speed can approach that space debris.In this paper,a methodology is described for fabrication of W-Mg functionally graded materials with density gradient,using metal W and Mg powder as row materials,according to the designed ratio oi mixed powder, mixture powders were layered into mold and uniaxially pressed together,finally,sintered under hot isostatic pressing.The impactor’s surface morphology from the magnesium-rich side to the tungsten-rich side can be observed by SEM,the results show that regular shaped tungsten particles were bonded together by magnesium, through energy spectrum analysis can be seen that W-Mg content showed gradient trend along the thickness direction.更多还原