Relationship Between Impact Velocity of Al2O3 Particles and Deposition Efficiency in Aerosol Deposition Method

Naoe, Kazuaki; Nishiki, Masashi; Yumoto, Atsushi

doi:10.1007/s11666-013-0031-8

Cited by 38 publications

(22 citation statements)

References 16 publications

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“…Naoe et al showed that, for Al 2 O 3 particles, the deposition efficiency and film‐substrate interface depends on the particle impact velocity. In addition, by using electron energy‐loss spectroscopy and previously reported first principles calculation, the authors inferred the existence of ionic and covalent bonding at the interface of Al 2 O 3 ceramic films on Cu substrates.…”

Section: Introductionmentioning

confidence: 99%

Revealing the effects of aerosol deposition on the substrate‐film interface using NaCl coating

Khansur

Eckstein

et al. 2019

J Am Ceram Soc

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Aerosol deposition is a feasible method of fabricating dense ceramic films at room temperature by the impact consolidation of submicron‐sized particles on ceramic, metal, glass, and polymer substrates at a rapid rate. Despite the potential usefulness of the aerosol deposition process, there are issues, such as deposition mechanisms and structure of the film‐substrate interface, that are not well understood. We have used complementary structural and microstructural analysis to capture the state of the substrate surface after the aerosol deposition process. The results reveal that modification of the substrate surface by the ejected submicron‐sized particles is essential for the formation of anchoring layer, thereby, a change in internal residual stress state and surface free energy of the substrate is required to deposit film using AD process. Our analysis also suggests that the adhesion between the metal substrate and ceramic particles is possibly contributed by both physical bonding and mechanical interlocking.

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Section: Introductionmentioning

confidence: 99%

Revealing the effects of aerosol deposition on the substrate‐film interface using NaCl coating

Khansur

Eckstein

et al. 2019

J Am Ceram Soc

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“…The method has received additional attention and undergone development because it is an attractive method of forming dense ceramic coatings 2,3) . Many ceramic powders, such as ZrO 2 4-6) , α-Al 2 O 3 2, 3,[7][8][9] , Pb(Zr 52 ,Ti 48 ) O 3 3,10) , Ni-Zn-Fe 3 O 4 3) , Li 4 Ti 5 O 12 11) , AlN 3) , MgB…”

Section: Introductionmentioning

confidence: 99%

Texture Development of α-Al<sub>2</sub>O<sub>3</sub> Ceramic Coatings by Aerosol Deposition

et al. 2016

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X-ray diffraction and electron backscattering diffraction analyses of the surfaces of α-Al 2 O 3 coatings formed by aerosol deposition and heat treatment up to 1573 K reveal that the coatings have textures. A texture with the (0001) plane inclined approximately 15 away from the coating plane is observed in an as-deposited specimen. During heat treatment, the (0001) plane becomes almost parallel to the coating plane. Texture development is observed with increasing heat treatment temperature.

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“…19) 하지만 VKS 공 정과 같이 크기와 밀도가 작은 세라믹 입자를 사용하는 경우, 가스 흐름에 의해 입자의 유동이 민감하기 때문 에 SCM 실험법으로는 유동장 내의 입자의 거동을 예 측하기 어렵다. 반대로 가스 및 입자 유동 해석 프로그 램인 computational fluid dynamics(이하 CFD) 전산모사 를 사용한 경우, [20][21][22] 25) Fig. 9(a)를 통 해 가스 유량에 따라 관 내의 가스 밀도가 변화하는 것 을 알 수 있다.…”

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Research on Acceleration Mechanism of Inflight Particle and Gas Flow Effect for the Velocity Control in Vacuum Kinetic Spray Process

Park¹,

Kwon²,

Lee³

et al. 2014

Korean Journal of Materials Research

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Vacuum kinetic spray(VKS) is a relatively advanced process for fabricating thin/thick and dense ceramic coatings via submicron-sized particle impact at room temperature. However, unfortunately, the particle velocity, which is an important value for investigating the deposition mechanism, has not been clarified yet. Thus, in this research, VKS average particle velocities were derived by numerical analysis method(CFD: computational fluid dynamics) connected with an experimental approach(SCM: slit cell method). When the process gas or powder particles are accelerated by a compressive force generated by gas pressure in kinetic spraying, a tensile force generated by the vacuum in the VKS system accelerates the process gas. As a result, the gas is able to reach supersonic speed even though only 0.6 MPa gas pressure is used in VKS. In addition, small size powders can be accelerated up to supersonic velocity by means of the drag-force of the low pressure process gas flow. Furthermore, in this process, the increase of gas flow makes the drag-force stronger and gas distribution more homogenized in the pipe, by which the total particle average velocity becomes higher and the difference between max. and min. particle velocity decreases. Consequently, the control of particle size and gas flow rate are important factors in making the velocity of particles high enough for successful deposition in the VKS system. Key words vacuum kinetic spray(aerosol deposition), particle velocity, computational fluid dynamics(CFD), slit cell method(SCM), process gas flow.

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Relationship Between Impact Velocity of Al2O3 Particles and Deposition Efficiency in Aerosol Deposition Method

Cited by 38 publications

References 16 publications

Revealing the effects of aerosol deposition on the substrate‐film interface using NaCl coating

Revealing the effects of aerosol deposition on the substrate‐film interface using NaCl coating

Texture Development of α-Al<sub>2</sub>O<sub>3</sub> Ceramic Coatings by Aerosol Deposition

Research on Acceleration Mechanism of Inflight Particle and Gas Flow Effect for the Velocity Control in Vacuum Kinetic Spray Process

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