Cold Gas Dynamic Spray (CGDS) Technology and Applications

Abstract

Thermal spray coatings are obtained by sending powder particles with high heat and/or kinetic energy onto a target substrate material in molten or semi-molten form. Nowadays, thermal spray coatings are used in many areas such as particularly aviation and defense industry and also energy, electronic and biomedical applications. These coatings, which provide superior properties such as wear, oxidation, corrosion and high mechanical strength on the surfaces applied, can be applied using different spray coating methods according to surface properties demanded. In addition to plasma spray coatings which are commonly used and allow a fast, economical and efficient coating production, High Velocity Oxy-Fuel (HVOF) coatings are also widely used due to the fact that they allow high quality coating production. However, HVOF coatings have a technology with high cost due to equipments and process properties used. In recent years, as alternative to plasma spray and HVOF coatings, Cold Gas Dynamic Spray (CGDS) coatings, which have superior properties, oxide-free and dense coating structure, have came into the forefront. The reason of why this system is called as "Cold Gas Dynamic Spray" is that outlet temperature of the gas present in nozzle is relatively lower than that of other methods. In this study, CGDS coating technology and applications, which is the center of interest for researcher and industrial users, were discussed and explained.

Keywords

• Cold Gas Dynamic Spray (CGDS), Plastic deformation, Thermal spray coating, Kinetic energy

Soğuk Gaz Dinamik Sprey (CGDS) Kaplama Teknolojisi ve Uygulamaları

Abstract

Termal sprey kaplamalar, hedef bir altlık malzeme üzerine yüksek ısıl ve/veya kinetik enerjiye sahip, erimiş ya da yarı erimiş formdaki toz parçacıkların gönderilmesi yoluyla elde edilmektedir. Günümüzde termal sprey kaplamalar; havacılık ve savunma sektörleri başta olmak üzere otomotiv, enerji, elektronik ve biyomedikal uygulamalar gibi birçok alanda kullanılmaktadır. Uygulandıkları yüzeyler üzerinde aşınma, oksidasyon, korozyon ve yüksek mekaniksel dayanım gibi üstün özelliklerin eldesine imkan veren bu kaplamalar istenilen yüzey özelliklerine göre farklı sprey kaplama yöntemleri kullanılarak uygulanabilmektedir. Yaygın olarak kullanılan hızlı, ekonomik ve verimli bir kaplama üretimine olanak veren plazma sprey kaplamaların yanında yüksek kaliteye sahip kaplama üretimine olanak veren Yüksek Hızlı Oksi-Yakıt Püskürtme (HVOF) kaplamalarda endüstride geniş bir yelpazede kullanım alanı bulmakta ancak kullanılan ekipman ve proses özellikleri yönüyle daha maliyetli bir teknolojiye sahiptir. Son yıllarda, plazma sprey ve HVOF kaplamalara alternatif olarak üstün özelliklere, oksitsiz ve yoğun kaplama yapısına sahip Soğuk Gaz Dinamik Sprey (CGDS) kaplamalar ön plana çıkmaktadır. Bu sistemin 'Soğuk Gaz Dinamik Sprey' olarak isimlendirilmesinin sebebi, göreceli olarak nozuldaki mevcut olan gaz çıkış sıcaklığının diğer yöntemlere göre düşük olmasıdır. Bu çalışmada, araştırmacı ve endüstriyel kullanıcılar için ilgi odağı oluşturan CGDS kaplama teknolojisi ele alınarak açıklanmıştır.

Keywords

• Soğuk Gaz Dinamik Sprey (CGDS), Plastik deformasyon, Termal sprey kaplama, Kinetik enerji

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