SPS熔铸制备Nb/Nb_5Si_3原位复合材料  

Preparation of Nb/Nb_5Si_3 in-situ Composites by SPS Smelting-casting

作　　者：陈哲[1,2,3] 严有为[2] 彭顺[3] 隽利伟[3] 李彦[3] 占礼春[3] 

机构地区：[1]南京大学物理系 [2]华中科技大学材料成形与模具技术国家重点实验室 [3]南昌工程学院机械系

出　　处：《特种铸造及有色合金》2010年第2期167-169,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50276023;50574042);中国博士后科学基金(20080441022);江苏省博士后科研资助计划(0802006B);江西省教育厅科技研究计划项目(GJJ09364)

摘　　要：利用SPS熔铸工艺成功制备了近理论密度的Nb/Nb5Si3原位复合材料,并用XRD、扫描电镜(SEM)、电子探针微区分析(EPMA)和电子能谱分析(EDS)研究复合材料的相组成和微观结构。结果表明,SPS熔铸的Nb/Nb5Si3复合材料组织由近球状的初生Nb颗粒与(Nb+Nb5Si3)共晶组织组成,且随着冷却速度增加,复合材料组织中的初生Nb颗粒和共晶组织变得细小。SPS熔铸工艺可同步实现Nb/Nb5Si3复合材料的原位合成与液态成形一体化,所制备Nb/Nb5Si3原位复合材料的密度达到理论密度的99.69%。Fully dense Nb/Nb5Si3 in-situ composites were successfully prepared by SPS smelting-casting, and phase constituent and microstructure of the composites were investigated by XRD (X-ray diffraction), SEM (scanning electron microscope), EPMA (electron probe micro-area analysis) and EDS(energy disperse spectroscopy). The results indicate that microstructure of the Nb/Nb5Si3 in-situ composites prepared by SPS smelting-casting is composed of near-spherical primary Nb particle and (Nb+Nb5Si3) eutectoid, and with increasing in cooling rate, near-spherical primary Nb particle and (Nb+Nb5Si3) eutectoid are refined gradually. Prepared composites reach 99.69% theoretical density in density. Integration of in-situ synthesis with liquid forming can be realized in preparation of Nb/Nb5Si3 in-situ composites by SPS smelting-casting.

关 键 词：放电等离子 Nb/Nb5Si3复合材料 熔铸 

分 类 号：TB33[一般工业技术—材料科学与工程]