CAJ | 학술논문

利用SPS熔铸工艺成功制备了近理论密度的Nb/Nb_5Si_3 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/Nb_5Si_3复合材料组织由近球状的初生Nb 颗粒与(Nb+Nb_5Si_3)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/Nb_5Si_3复合材料的原位合成与液态成形一体化,所制备Nb/Nb_5Si_3原位复合材料的密度达到理论密度的99.69%.
이용SPS용주공예성공제비료근이론밀도적Nb/Nb_5Si_3 원위복합재료,병용XRD、소묘전경(SEM)、전자탐침미구분석(EPMA)화전자능보분석(EDS)연구복합재료적상조성화미관결구.결과표명,SPS용주적Nb/Nb_5Si_3복합재료조직유근구상적초생Nb 과립여(Nb+Nb_5Si_3)공정조직조성,차수착냉각속도증가,복합재료조직중적초생Nb과립화공정조직변득세소.SPS용주공예가동보실현Nb/Nb_5Si_3복합재료적원위합성여액태성형일체화,소제비Nb/Nb_5Si_3원위복합재료적밀도체도이론밀도적99.69%.
Fully dense Nb/Nb_5Si_3 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/Nb_5Si_3 in-situ composites prepared by SPS smelting-casting is composed of near-spherical primary Nb particle and (Nb+Nb_5Si_3) eutectoid, and with increasing in cooling rate, near-spherical primary Nb particle and (Nb+Nb_5Si_3) 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/Nb_5Si_3 in-situ composites by SPS smelting-casting.