2@Nb粉體。采用表面活性劑SDS（CHSO4Na）和CTAB（C19H42BrN）對2種顆粒表面進行改性，使其帶電，并用Zeta電位計測試懸浮液的Zeta電位。采用掃描電鏡、透射電鏡和能譜儀對合成材料的物相、形貌、結構和元素分布進行了表征。結果表明：當SDS濃度為2 mmol/L，CTAB濃度為3 mmol/L，Nb懸浮液pH值為5時，二次包覆后涂層效果較好。在200 ℃氬氣中煅燒2 h后，Nb與MoSi2的界面處發(fā)現(xiàn)了NbSi2相，表明Nb具有高活性并與Si反應。在1450 ℃單軸壓力40 MPa下放電等離子燒結2 h后，MoSi2@Nb材料中仍保留了核殼結構。然而，Nb與MoSi2反應強烈，大部分Nb相發(fā)生反應，這個問題在后續(xù)研究中亟待解決。與MoSi2材料的斷裂韌性（KIC=3.32 MPa·m0.5）相比，MoSi2@Nb材料的KIC顯著提高至5.75 MPa·m0.5。;Core-shell MoSi2@Nb powder was prepared by electrostatic layer self-assembly method. The surfactants SDS (CHSO4Na) and CTAB (C19H42BrN) were used to modify the surface of the two particles to make them charged, and the Zeta potential of the suspension was tested by the Zeta potentiometer. Scanning electron microscope, transmission electron microscope and energy dispersive spectrometer were used to characterize the phase, morphology, microstructure and element distribution of synthetic materials. The results show that when the SDS concentration is 2 mmol/L, the CTAB concentration is 3mmol/L and the pH value of Nb suspension is 5, the coating effect is better after secondary cladding. NbSi2 phase is found at the interface between Nb and MoSi2 after calcination at 200 °C for 2 h in Ar atmosphere, indicating that Nb is highly active and reacts with Si. Core-shell structure is still retained in MoSi2@Nb material after spark plasma sintering at 1450 °C for 2 h under uniaxial pressure of 40 MPa. However, it is found that Nb reacts strongly with MoSi2, and most of the Nb phase is reacted. This issue needs to be addressed in subsequent studies. The fracture toughness (KIC) of MoSi2@Nb material is significantly improved to 5.75 MPa·m0.5 compared with that of MoSi2 material (3.32 MPa·m0.5)."/>