Synthesis and Coating with Electrophoretic Deposition of ZIF-8 for the Improvement of Surface Properties of CoCrW Alloy

Öz

Cobalt-based alloys, which exhibit excellent properties in terms of wear and high corrosion resistance as well as biocompatibility, stand out among other metallic implant materials. However, traditional production methods such as casting, forging and machining are insufficient in many industrial applications for the production of difficult-to-machine metallic special parts such as CoCr alloys. Therefore, with the developing technology, interest in modern production methods such as powder metallurgy and additive manufacturing has increased. Selective laser melting (SLM) with laser powder bed fusion (L-PBF) is one of the most preferred additive manufacturing methods for the production of materials with complex internal structures that traditional manufacturing methods cannot support. In addition, since CoCr alloys, like all other metallic materials, exhibit inert properties in terms of biocompatibility within the body, the lack of behaviors such as osseointegration, bioactivity, antibacteriality in implants produced from these alloys negatively affects the success of the implant. In this respect, surface properties can be improved by applying various surface treatments to the surfaces of these materials. In this sense, ZIF-8 metal organic framework (Zn-Zeolitic imidazolate framework) coating material, which exhibits hydrophobic character with its hexagonal geometry and porous structure, is remarkable for its chemical and thermal stability as well as its antibacterial and biocompatibility. In this study, ZIF-8 coating material was first synthesized with Zn(NO3)2 and 2-methylimidazole using methanol solvent at 50 °C. In addition, CoCrW alloy samples with dimensions of 10 x 10 x 2 mm3 were produced by SLM method. The synthesized ZIF-8 material was coated on the surface of CoCrW samples by electrophoretic deposition (EPD) method. Following the synthesis and coating processes, structural (XRD) and morphological (SEM) characterizations were performed to confirm both the successful synthesis of ZIF-8 material and the successful coating of ZIF-8 material on CoCrW sample surfaces by EPD method.

Anahtar Kelimeler

• CoCrW
• biomaterial
• antibacterial
• ZIF-8
• metal organic frameworks

CoCrW Alaşımının Yüzey Özelliklerinin İyileştirilmesi için ZIF-8 Sentezi ve Elektroforetik Biriktirme ile Kaplanması

Öz

Aşınma ve yüksek korozyon direncinin yanı sıra biyouyumluluk açısından da mükemmel özellikler sergileyen kobalt bazlı alaşımlar, diğer metalik implant malzemeleri arasında öne çıkmaktadır. Ancak döküm, dövme ve talaşlı imalat gibi geleneksel üretim yöntemleri, CoCr alaşımları gibi işlenmesi zor metalik özel parçaların üretimi için birçok endüstriyel uygulamada yetersiz kalmaktadır. Bu nedenle gelişen teknoloji ile birlikte toz metalurjisi ve eklemeli imalat gibi modern üretim yöntemlerine olan ilgi artmıştır. Lazer toz yatağı füzyonu (L-PBF) ile seçici lazer eritme (SLM), geleneksel imalat yöntemlerinin destekleyemediği karmaşık iç yapılara sahip malzemelerin üretimi için en çok tercih edilen eklemeli imalat yöntemlerinden biridir. Ayrıca diğer tüm metalik malzemeler gibi CoCr alaşımları da vücut içerisinde biyouyumluluk açısından inert özellikler sergilediğinden, bu alaşımlardan üretilen implantlarda osseointegrasyon, biyoaktivite, antibakteriyellik gibi davranışların olmaması implantın başarısını olumsuz yönde etkilemektedir. Bu açıdan bu malzemelerin yüzeylerine çeşitli yüzey işlemleri uygulanarak yüzey özellikleri iyileştirilebilmektedir. Bu anlamda, altıgen geometrisi ve gözenekli yapısıyla hidrofobik karakter sergileyen ZIF-8 metal organik çerçeve (Zn-Zeolitik imidazolat çerçeve) kaplama malzemesi, antibakteriyel ve biyouyumluluğunun yanı sıra kimyasal ve termal kararlılığıyla da dikkat çekmektedir. Bu çalışmada, ZIF-8 kaplama malzemesi ilk olarak Zn(NO3)2 ve 2-metilimidazol ile 50 °C'de metanol çözücüsü kullanılarak sentezlenmiştir. Ayrıca SLM yöntemi ile 10 x 10 x 2 mm3 boyutlarında CoCrW alaşım numuneleri üretilmiştir. Sentezlenen ZIF-8 malzemesi elektroforetik biriktirme (EPD) yöntemi ile CoCrW numunelerinin yüzeyine kaplanmıştır. Sentez ve kaplama işlemlerinin ardından, hem ZIF-8 malzemesinin başarılı sentezini hem de ZIF-8 malzemesinin EPD yöntemiyle CoCrW numune yüzeylerine başarılı bir şekilde kaplandığını doğrulamak için yapısal (XRD) ve morfolojik (SEM) karakterizasyonlar gerçekleştirilmiştir.

Anahtar Kelimeler

• CoCrW
• biyomalzeme
• antibakteriyel
• ZIF-8
• metal organik çerçeveler

Kaynakça

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