Comparative Corrosion Behaviour of Cold Sprayed Titanium/Hydroxyapatite and Titanium/Baghdadite Composite Coatings in Simulated Body Fluid Environment

Avneesh Kumar, Teekam Chand, R. Kant, Harpreet Singh
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Abstract

Bioceramics deposition on medical devices is a widespread area of research for biomedical industries since such deposits can induce excellent chemical and biological properties to the devices. Thermal spraying has been a popular choice for developing coatings to enhance the mechanical, chemical, and biological responses of medical devices. However, the high heat involved during the thermal spraying of bioceramics limits their functionality. In this context, low processing temperature in cold spraying is believed to protect the bioceramics from degradation. However, depositing bioceramics using cold spray and achieving good mechanical properties are still challenging tasks because of their poor ductility. Therefore, bio metal matrix composites with reinforced bioceramics produced using cold spray are expected to give good mechanical, chemical, and biological properties. The present work presents deposition and microstructural characterization of titanium/hydroxyapatite (Ti/HA) and titanium/baghdadite (Ti/BAG) composite coatings by cold spraying. Furthermore, the comparative corrosion response of these coatings under a simulated body fluid environment is reported. The effect of laser remelting on microstructure and corrosion behavior is also discussed.
冷喷涂钛/羟基磷灰石和钛/巴格达石复合涂层在模拟体液环境中的腐蚀行为比较
生物陶瓷沉积在医疗器械上是生物医学工业研究的一个广泛领域,因为这种沉积可以诱导设备具有优异的化学和生物特性。热喷涂已成为开发涂层以增强医疗设备的机械,化学和生物反应的流行选择。然而,生物陶瓷热喷涂过程中涉及的高热限制了它们的功能。在这种情况下,低温冷喷涂的加工温度被认为可以防止生物陶瓷的降解。然而,由于生物陶瓷的延展性差,使用冷喷涂沉积生物陶瓷并获得良好的力学性能仍然是一项具有挑战性的任务。因此,使用冷喷涂技术生产的生物金属基复合材料与增强生物陶瓷有望提供良好的机械、化学和生物性能。采用冷喷涂技术制备了钛/羟基磷灰石(Ti/HA)和钛/巴格达石(Ti/BAG)复合涂层,并对其微观结构进行了表征。此外,还报道了这些涂层在模拟体液环境下的腐蚀响应。讨论了激光重熔对合金显微组织和腐蚀行为的影响。
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