摘要
采用金属/H2共晶定向凝固技术在纯H2气氛下制备了不同气压条件下的多孔Cu-1.3Cr合金,研究了气体压力对多孔Cu-1.3Cr合金气孔结构和分布的影响。结果表明,在纯H2条件下,平均孔隙率随气压升高逐渐增大,当气压超过0.5 MPa时,由于气体逸出造成孔隙率有所下降;气孔平均孔径随气压升高而减小;气压越高,气孔越多,气孔分布越均匀。同时,气孔的尺寸分布范围变窄,气孔间距变小。
GASAR porous Cu-1.3Cr alloys were fabricated by a metal/hydrogen unidirectional solidifica- tion method under a hydrogen pressure of 0.1,0. 2,0. 4,0. 5 and 0.6 MPa. Effects of hydrogen pressures on pore structure and distribution of GASAR porous Cu-1.3Cr alloys were analyzed. The results reveal that at pure hydrogen atmosphere,with increasing in hydrogen atmosphere, the porosity tends to firstly increase and then decrease, and the average pore diameter tends to decrease. Meanwhile, the uniformity of pore size,spatial distribution of pores and pore-cells are increased with hydrogen pressure increase, which are attributed to the increase of gas density and narrow of distribution range of pore size as well as decrease of pore distance.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2015年第6期572-576,共5页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51164018)
云南省教育厅基金资助项目(2012Y337)
