Effect of CeO2 on Microstructure and Wear Resistance of TiC Bioinert Coatings on Ti6Al4V Alloy by Laser Cladding

Abstract

To solve the lack of wear resistance of titanium alloys for use in biological applications, various prepared coatings on titanium alloys are often used as wear-resistant materials. In this paper, TiC bioinert coatings were fabricated on Ti6Al4V by laser cladding using mixed TiC and ZrO2 powders as the basic pre-placed materials. A certain amount of CeO2 powder was also added to the pre-placed powders to further improve the properties of the TiC coatings. The effects of CeO2 additive on the phase constituents, microstructures and wear resistance of the TiC coatings were researched in detail. Although the effect of CeO2 on the phase constituents of the coatings was slight, it had a significant effect on the microstructure and wear resistance of the coatings. The crystalline grains in the TiC coatings, observed by a scanning electron microscope (SEM), were refined due to the effect of the CeO2. With the increase of CeO2 additive content in the pre-placed powders, finer and more compact dendrites led to improvement of the micro-hardness and wear resistance of the TiC coatings. Also, 5 wt % content of CeO2 additive in the pre-placed powders was the best choice for improving the wear properties of the TiC coatings.

Laser Cladding of Ti-Based Ceramic Coatings on Ti6Al4V Alloy: Effects of CeO2 Nanoparticles Additive on Wear Performance

“…The laser system was mainly made up of an RFL-C500 fiber laser (Wuhan Raycus Fiber Laser Technologies Co., Ltd., Wuhan, China) with a maximum power of 500 W and a BT-230 laser head (RayTools AG, Burgdorf, Switzerland) that integrated a lens with a diameter of 75 mm and a focal length of 250 mm. A fiber with a core radium of 25 µm and a laser head were joined by a QBH connector [14]. During the laser cladding process, a laser beam was irradiated on the surface of the pre-placed powder layer, and then the pre-placed powder and a thin layer of the substrate melted rapidly.…”

“…In order to fabricate a bioinert ceramic coating with high wear-resistant properties, a suitable cladding powder material system should be chosen well. In our previous study [14], TiC powder was used as the principal cladding material to fabricate a bioinert coating. Compared to TiC, titanium carbonitride (TiCN) has better toughness, and TiCN has been reported to exhibit superior properties: High hardness, excellent wear and corrosion resistance, and good chemical stability that makes it useful in aggressive environments [15][16][17].…”

“…In our previous investigation [14], 20 wt % ZrO 2 powder was added into a cladding material system to improve the mechanical properties of the TiC bioinert coating, such as toughness. Since TiCN has good mechanical properties, however, it is widely known that the flowability of ceramic powder is poor, which may cause agglomerate formation [20,21].…”

Improvement of Anti-corrosion and Tribotechnical Properties of Ti6Al4V Alloy by Deposition of Spark Ti-Al-Si-C Coatings

“…Однако использование данного сплава в некоторых важных конструкционных элементах ограничено из-за его сравнительно низкой жаростойкости [3] и плохой износостойкости [4]. Поэтому одной из актуальных проблем является улучшение свойств сплава Ti6Al4V методами модифицирующей поверхностной обработки [5][6][7][8][9][10][11][12][13][14][15][16]. Поверх-ностные свойства титанового сплава могут быть улучшены с помощью технологий модификации поверхности, таких как азотирование и цементация [17][18]19], газопламенное напыление [11], физическое осаждение из паровой фазы [14,20], химическое осаждение из паровой фазы [21], лазерная наплавка [6,8], плазменно-электролитическое оксидирование [10,12], электроискровое легирование [22] и т.д.…”

“…При электроискровом легировании материал анода подвергается электрической эрозии в условиях воздействия электрических разрядов, переносится на катод, перемешивается и образует покрытие, металлургически связанное с подложкой [23]. Эффективные износостойкие покрытия на сплаве Ti6Al4V удается получить за счет использования тугоплавких соединений [5][6]. В связи с этим целью настоящей работы стало исследование состава и свойств покрытий на основе карбида кремния со связкой из интерметаллидов титана-алюминия, устойчивых к воздействию высоких температур и агрессивных сред [24][25].…”