摘要
在电解液中加入cr203微粒，以共生沉积方式在Ti6A14V表面制备微弧氧化／Cr2O3复合膜。利用SEM、XRD、EDS等研究复合膜的生长规律及Cr2O3微粒的沉积方式，通过摩擦试验分析不同生长阶段的复合膜的摩擦磨损性能。结果表明：在0～30min内，复合膜呈近线性增长，之后生长速率明显变缓，膜层表面也出现了大块Cr2O3团聚体。复合膜主要由金红石TiO2、锐钛矿TiO2及Cr2O3相组成。随氧化时间的延长，锐钛矿TiO2逐渐减少，金红石TiO2含量先增加后趋于稳定，而Cr2O3的衍射峰一直增强，复合膜的耐磨性也先增后降；氧化20min时，复合膜的耐磨性最好，摩擦系数最小，仅为0．05～0．2。在微弧氧化过程中，Cr2O3微粒或直接吸附在熔融态的氧化膜表面，或被捕捉、锁定到氧化膜的表面微孔中；也有部分Cr2O3微粒被高温放电产生的熔融物裹覆并一起遇冷凝固到氧化膜中。
The microarc oxidation （MAO） composite coating containing Cr203 microparticles on Ti6AI4V alloy was prepared by co-deposition in the electrolyte with Cr203 microparticles addition. The growing characters of the composite coating and deposition styles of Cr203 microparticles were studied by SEM, XRD and EDS. The tribological behaviors of the composite coating formed at different oxidation time were evaluated using abrasive tests. The results show that the thickness of the composite coating is linearly increased in 30 min; afterwards the growth rate of the composite coating decreases evidently, and large lumps of Cr203 agglomerate appear on the film surface in the later stage. The composite coating is mainly composed of rutile-TiO2, anatase-TiO2 and Cr203 phase. The anatase-TiO2 decreases gradually, the content of rutile-TiO2 increases firstly and then becomes stable, but the diffraction peak of Cr203 phase strengthens continuously with the increasing of oxidation time. Besides, the wear-resistance of the composite coating is improved firstly and then reduced with the increasing of oxidation time. The composite coating formed at 20 min exhibits good antifriction property, whose friction coefficient is 0.05-0.2. In the process of MAO, Cr2O3 microparticles may be adsorbed directly on the surface of the molten oxidation coating, or may be caught and locked into the irregular pores of oxidation coating. In additon, some Cr2O3 particles may be wrapped by molten products generated in the microarc discharge channel, and solidified together into the oxidation coating.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第7期1402-1406,共5页
Rare Metal Materials and Engineering
基金
江西省自然科学基金(20122BAB206017)
