【激光熔覆金属陶瓷复合层中陶瓷相的行为研究】曾晓雁.pdf

【激光熔覆金属陶瓷复合层中陶瓷相的行为研究】曾晓雁.pdf

BEHAVIORALINVESTIGATIONOF CERAMIC PHASEINLASER CLADDED CERAMIC-METAL COMPOSITE COATING Ph.D.Dissertation Ph.D.Candidate:Zeng Xiaoyan Major MaterialsScience and Engineering Advisor Prof.Cui Kun Ass.advisor Prof.Tao Zengyi Mechanical EngineeringDepartment,II Huazhong University of Science and Te华中理工大学博士论文 一些混乱概念,为制定陶瓷相的烧损程度的评价标准奠定了基础。并进一步定义使陶瓷相硬 度降低的烧损为功能烧损,使陶瓷相的体积减小的烧损为体积烧损.各种堆焊工艺条件下,陶瓷相的烧损形式可能有六种:溃散式、边界熔融式、非均匀长大 式、黑圈式、黑心式和溶解扩散式烧损。其中,前五种形式属功能烧损,后一种属体积烧损。激 光熔覆金属陶瓷层中,烧结WC颗粒可能发生黑心式、非均匀长大式、黑圈式及溶解扩散式 烧损.铸造WC颗粒则可能发生溃散式、非均匀长大式和溶解扩散式烧损。对单晶WC而 的碳化钨中均未发现这一现象。华中理工大学博士论文 Abstract Laser cladded ceramic-metal composte coating(LCCC) is a technique to clada layer of ceramic-metalcompositematerialwithhighhardness,excellentthermalstabilityon the conventionalmetalmaterialsby laser beam,where the composite coating is metallurgical bonded with the substrate.