原位自生TiCp/Ni60A复合涂层组织结构及长大特性  

Microstructure and Growth Characteristic of In-Situ Synthesized TiC/Ni Based Composite Coating

作　　者：王振廷[1] 孟君晟[1] 王永东[1] 胡国梁[1] 

机构地区：[1]黑龙江科技学院,黑龙江哈尔滨150027

出　　处：《稀有金属材料与工程》2007年第A02期709-711,共3页Rare Metal Materials and Engineering

基　　金：国家自然资金项目(50075085);黑龙江省普通高等学校骨干教师创新计划项目(1054G046)

摘　　要：以Ni60A、钛粉和石墨粉为原料,采用高频感应熔覆技术,在16Mn钢表面原位合成了TiC颗粒增强镍基复合材料涂层。借助扫描电境、X射线衍射仪、显微硬度计对复合涂层的组织结构、TiC颗粒的生长方式和性能进行了分析。结果表明:TiC是由钛粉和石墨粉原位反应生成的,原位形成的TiC颗粒细小,分布均匀,平均尺寸为0.5～1μm。熔覆层与基体呈冶金结合,涂层无裂纹、无气孔等缺陷。熔覆层组织由TiC颗粒、γ-Ni奥氏体枝晶和枝晶间M_(23)C_6共晶组织组成。熔覆层中TiC颗粒的形状有2种,一种是规则形状的八面体,另一种是由微小的八面体TiC堆积而成的花瓣状。TiC颗粒的长大是由微小的八面体TiC颗粒堆积而成,以对角连接方式长大速度最快。涂层的维氏硬度可达9800 MPa～10000 MPa。Ni-based composite coating reinforced by TiC particle was fabricated on a substrate of 16Mn steel by induction cladding of the Ni60A, Ti and C alloy powders. The growth morphology of the TiC particles and microstructure and properties of coating were investigated by SEM, X-Ray diffraction meter, transmission electron microscope and microhardness tester. The results indicate that TiC particles is synthesized in-situ, and TiC particles in-situ synthesized are fine in size of 0.5 μm- 1.0μm and distributed uniformly. The excellent bonding between the coating and the 16Mn steel substrate is ensured by the strong metallurgical bonding, and the coating is uniform, continuous and almost defect-free. The microstructure of induction clad coating consist of TiC particles, 7-Ni and eutectic structure M23C6. TiC particles are formed by the stacking of the micro-octahedron TiC, which are in the shape of octahedron or petal. The petal shape TiC is composed of a great deal of micro-octahedron TiC, growing in the forms of verte-linked. The microhardness of clad coating was HV9800 MPa- 10000 MPa.

关 键 词：感应熔覆 复合TiC涂层 原位自生 长大特性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]