高含量多尺度硬质相和强韧基体及良好界面结合可提高热喷金属陶瓷涂层硬度、韧性和耐磨性。针对热喷多尺度和纳米WC-Co涂层因纳米WC熔化分解失碳和基体相脆化引起的韧性和磨损性能降低问题，提出超音速火焰喷涂以纳米和亚微米Cr3C2代替纳米WC、以添加稀土CoNi替代Co的含微米WC多尺度双碳化物稀土改性WC-Cr3C2-CoNi (La)粉末，制备基于纳米Cr3C2沉淀、亚微米Cr3C2弥散、稀土元素细化粘结相晶粒，Cr3C2和稀土元素拟制WC晶粒粗化和改善粘结相润湿性的双相及界面强化的涂层。通过分析不同条件下粒子飞行过程及沉积涂层的成分、相与组织结构变化，研究粒子沉积行为和涂层形成机制。结合喷涂态和热处理后涂层显微硬度、断裂韧性及磨损性能，探讨涂层性能变化规律及制约的主要结构参量、工艺参数及粉末因素，阐明不同碳化物及稀土元素对涂层的强韧化机制。为利用江西钨稀土等制备耐磨金属陶瓷涂层提供理论依据

High volume fraction of multimodal hard phase and tough matrix as well as its well bonded interface can improve the hardness, fracture toughness and abrasive wear of thermal sprayed cermet coatings. To avoid the decrease in fracture toughness and wear resistance of HVOF sprayed nano or multimodal WC-Co coatings resulted from melting, resolving, decarbonizing of nao WC and embrittling of bind phase, the nano and submicro C3C2 and the NiCo with the addition of La2O3, which substitute for nao WC and Co，as well as micro WC were employed to fabricate the multimodal scale and two kind carbide WC-Cr3C2-CoNi (La) powders used to deposited coatings with the strengthened matrix phase aroused by the precipitation and dispersion of nano and submicro C3C2, and the refined microstructure and improved wet ability to carbide resulted form rare earth element, and the little coarsened WC by the action of C3C2 and rare earth element. The deposition behavior of the particles and the formation of coating microstructure as well as the variation of coating properties were investigated by characterizing the composition, phase constitution and microstructure of individual splats and as-deposited coating. Combined with the evaluation of microhardness, bond strength, fracture toughness as well as abrasive wear rate of the coatings in as deposited and annealing state, the key structures and phase compositions of the coatings, deposition conditions and the particle compositions and structures, which have a dominant effect on coating properties, were studied. The enhancing mechanism of carbides and rare earth element on the coating was explored. This study was beneficial to utilize the W and rare earth resources to fabricate the new cermet powder.