原位TiB/凹凸棒石矿物双相增强Ti基复合材料的制备及其摩擦学性能  

Preparation and Tribological Properties of In-Situ TiB/Attapulgite Mineral Dual-Phase Reinforced Ti Matrix Composites

作　　者：宋占永 王红美 于鹤龙 尹艳丽 周新远 郭永明 SONG Zhanyong;WANG Hongmei;YU Helong;YIN Yanli;ZHOU Xinyuan;GUO Yongming(National Key Laboratory for Remanufacturing,Army Academy of Armored Forces,Beijing 100072,China;School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]陆军装甲兵学院装备再制造技术国防科技重点实验室,北京100072 [2]天津大学材料科学与工程学院,天津300072

出　　处：《摩擦学学报（中英文）》2024年第3期280-291,共12页Tribology

基　　金：国家自然科学基金项目(52075544)资助。

摘　　要：以Ti、Al、B和凹凸棒石矿物粉体为原料,利用放电等离子烧结(SPS)工艺制备了原位TiB/凹凸棒石矿物双相增强Ti基复合材料,借助扫描电镜、能谱仪、X射线衍射仪、X射线光电子能谱仪、显微硬度计和纳米压痕仪等研究了凹凸棒石矿物对原位Ti基复合材料微观组织、物相结构、增强体形态与分布以及微纳力学性能的影响,采用SRV滑动磨损试验机考察了其在油润滑条件下的摩擦学性能,探讨了凹凸棒石改善原位Ti基复合材料力学及摩擦学性能的作用机制.结果表明,SPS工艺制备的原位TiB/凹凸棒石矿物双相增强Ti基复合材料组织致密,原位自生TiB增强体分布均匀,凹凸棒石矿物对复合材料基质相具有明显的细晶强化作用.在摩擦过程中复杂的物理和化学作用下,凹凸棒石矿物与复合材料中的Ti、Al以及对偶钢球的Fe等元素发生摩擦化学反应,在摩擦表面形成了由金属氧化物、二氧化硅、石墨和凹凸棒石矿物等构成的减摩自修复层,从而使钛基复合材料表现出优异的摩擦学性能.The application of Ti alloys as friction components is limited owing to their low hardness,high friction coefficient,and poor wear resistance.Generally,introducing hard reinforcement to obtain discontinuous reinforced titanium-matrix composites by single-phase or multiphase coordination is an effective way to improve the mechanical and tribological performance of titanium-matrix materials.In this study,in situ TiB/attapulgite dual-phase-reinforced Ti matrix composites were prepared using Ti,Al,B and attapulgite natural mineral powders as raw materials by spark plasma sintering (SPS).The effects of attapulgite on the microstructure,phase structure,morphology,and distribution of in situ TiB reinforcements and the micromechanical properties of the composites were studied by means of scanning electron microscopy (SEM),energy dispersive spectroscopy (EDS),X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),microhardness and nanoindentation testing.The tribological properties of the composites under oil lubrication were investigated using an SRV reciprocating sliding-wear tester.Finally,the mechanisms by which attapulgite mineral improved the mechanical and tribological properties of in situ titanium matrix composites were discussed.The results showed that the in situ TiB/attapulgite dual-phase reinforced Ti matrix composites prepared by SPS had a compact structure and uniform distribution of in-situ TiB reinforcements.The attapulgite mineral exhibited an obvious fine-grained strengthening effect on the composites.Compared with the pure in situ TiB/Ti composites,the matrix grain and in situ TiB size of the dual-phase-reinforced composites were refined after the addition of the attapulgite natural mineral.The matrix phase indentation hardness (H_(IT)) and composite microhardness increased by approximately 31.4%and 39.3%,respectively.Compared with pure TiB-reinforced Ti matrix composites,dual-phase reinforced composites exhibited superior tribological properties,and the friction coefficient and wear rate incre

关 键 词：原位TiB 凹凸棒石 钛基复合材料 放电等离子烧结 摩擦学性能 

分 类 号：TH117.1[机械工程—机械设计及理论] TB333[一般工业技术—材料科学与工程]