摘要
采用一种新型的楔压工艺对大尺寸多层喷射共沉积SiCp/7090复合材料进行致密化加工,研究了楔压加工对多层喷射沉积工艺制备的SiCp/7090复合材料组织及性能以及沉积坯与挤压坯密度的影响规律。研究表明,楔压过程中,在大的静水压力以及剪切应力的共同作用下,复合材料中孔洞被逐渐拉长闭合,致密化效果良好,压制后,SiC颗粒被明显破碎,其分布得到改善。致密化后的材料经过热处理后其横向强度σb达到540MPa,压向强度σb达到325MPa。
The densification of multi-layer co-deposited large dimensional 7090/SiC_p composites was performed by extruding casting.The effects of extruding process on the microstructure and properties of the composites and on the densities of as-deposited and as-extruded composites were described.The results reveal that pores in the composites are elongated to gradually close as a result of co-action of heavy hydrostatic pressure and shearing stress during extruding process,taking a positive densification effect.The distribution of SiC particles in the extruded composites was obviously improved due to its broken during extruding process.And the tensile strength of as-extruded composites is 540 MPa in transverse direction and is 325 MPa in longitude direction after heat treatment.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2008年第1期1-3,共3页
Special Casting & Nonferrous Alloys
基金
教育部新世纪人才支持计划资助项目(NCET-06-0701)
湖南省重点实验室资助项目(06FJ3041)
