CAJ | 학술논문

本文采用热分析法研究几种金属-氢气共晶反应定向凝固制备藕状多孔材料气孔的形成和长大机理.结果表明,这种工艺气孔是借助熔融金属中的活性杂质非匀质形核的,而长大则是沿固液界面的法线方向向具有粗糙界面的气固相转移,最终形成气孔规则定向排列于金属基体中的多孔材料.
본문채용열분석법연구궤충금속-경기공정반응정향응고제비우상다공재료기공적형성화장대궤리.결과표명,저충공예기공시차조용융금속중적활성잡질비균질형핵적,이장대칙시연고액계면적법선방향향구유조조계면적기고상전이,최종형성기공규칙정향배렬우금속기체중적다공재료.
The pore nucleation and growth of porous materials by hydrogen-metal eutectic growth for upward direc-tional solidification were studied by heat analysis method. The results show that the pore is produced by heteroge-nous nucleation in virtue of active impurity in melt metal during the process of directional solidification. And the pore growth is along normal directian of solid-liquid interface and toward coarse interface of gas-solid phase. Finally, the pores are distributed uniformly along the direction of diameter.