低压等离子喷涂制备喷雾干燥型与机械混合型ZrB_2-MoSi_2复合涂层的比较研究（英文）  

A Comparative Study of Spray-dried and Mechanicallymixed ZrB_2-MoSi_2 Composite Coatings Fabricated by Low Pressure Plasma Spray

作　　者：毛金元 刘敏[2] 邓春明[2] 毛杰[2] 曾德长[1] 

机构地区：[1]华南理工大学,广东广州510640 [2]广州有色金属研究院,广东广州510650

出　　处：《稀有金属材料与工程》2016年第6期1386-1390,共5页Rare Metal Materials and Engineering

摘　　要：利用喷雾干燥与真空烧结技术制备团聚型ZrB_2-MoSi_2复合粉末,以这些粉末为原料,通过低压等离子喷涂法制备了ZrB_2-30%MoSi_2(质量分数)复合涂层(SZM涂层)。作为对比,利用机械混合粉末制备了ZrB_2-30%MoSi_2复合涂层(MZM涂层)。借助SEM、XRD和EDS等对涂层的组织结构进行研究,并利用霍尔流速计和松装密度计对团聚粉末的流动性和松装密度进行了测试。此外,对涂层的显微硬度、孔隙率和氧化特性均进行了研究。结果表明:喷雾干燥粉末在1200℃真空烧结1 h后,它的流动性和松装密度分别达到25.8s/50 g和1.12 g/cm^3。与MZM涂层相比,SZM涂层中的MoSi_2分布更加均匀,而且结构更加致密。所以团聚粉末制备的涂层在1500℃表现出更好的抗氧化性能。The agglomerated ZrB_2-MoSi_2 composite powder was prepared by spray drying and sintering. The spray-dried ZrB_2-30wt%MoSi_2（SZM） composite coating was manufactured by low pressure plasma spray（LPPS） using the agglomerated powder. For comparison, the mechanically-mixed ZrB_2-30wt%MoSi_2（MZM） composite coating was also prepared by LPPS. The composite powders and the coatings were characterized by X-ray diffraction and scanning electron microscopy. The flowability and the loose density of the agglomerated powders were measured by Hall flow meter and loose density instrument, respectively. Microhardness, porosity and oxidation behavior of the coatings were also investigated. The results show that when the spray-dried powder is sintered at 1200 °C for 1 h, its flowability and loose density are up to 25.8 s/50 g and 1.12 g/cm3, respectively. The distribution of MoSi_2 phase in SZM coating is much more uniform than that in MZM coating. Additionally, the SZM coating exhibits a high compactness and much better oxidation-resistance at 1500 °C compared to the MZM coating.

关 键 词：ZrB2-MoSi2 低压等离子喷涂 氧化 碳/碳复合材料 

分 类 号：TB306[一般工业技术—材料科学与工程]