Experimental and analytical study of ultrasonic micro powder feeding

Yang, Yong; Li, Xiaochun

doi:10.1088/0022-3727/36/11/316

Cited by 36 publications

(13 citation statements)

References 16 publications

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“…Ultrasonic vibration assisted dry powder dispensing has been investigated widely for different applications [11][12][13][14][15]. The studies demonstrated that dry powder flow rates can be effectively and accurately regulated by controlling the electrical pulses to the piezoelectric transducer.…”

Section: Introductionmentioning

confidence: 99%

3D printing of multiple metallic materials via modified selective laser melting

et al. 2018

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Selective Laser Melting (SLM) is a powder bed layer-by-layer fusion technique mainly applied for additive manufacturing of 3D metallic components of complex geometry. However, the technology is currently limited to printing a single material across each layer. In many applications such as the manufacture of certain aero engine components, conformably cooled dies, medical implants and functional gradient structures, printing of multiple materials are desirable. This paper reports an investigation into the 3D printing of multiple metallic materials including 316L stainless steel, In718 nickel alloy and Cu10Sn copper alloy within a single build-up process using a specially designed multiple material SLM system combining powder-bed with point by point powder dispensing and selective material removal, for the first time. Material delivery system design, multiple material interactions, and component characteristics are described and the associated mechanisms are discussed. 3D printing, selective laser melting, multiple materials 2. Experimental materials and procedure 2.1. Materials Gas atomized spherical 316L stainless steel powder (LPW-718-AACF, 10-45 µm, LPW Technology Ltd., UK), In718 nickel alloy powder (LPW-316-AAHH, 10-45 µm LPW Technology Ltd., UK), Contents lists available at SciVerse ScienceDirect CIRP Annals Manufacturing Technology

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Section: Introductionmentioning

confidence: 99%

3D printing of multiple metallic materials via modified selective laser melting

et al. 2018

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“…A method using a vibrating capillary tube has been developed to control the mass flow rate of fine powders (Matsusaka et al, 1995(Matsusaka et al, , 1996Yang and Li, 2003;Evans, 2003, 2005). Using the vibrating capillary tube technique, the flowability of fine powders will be characterized in actual powder flow through obtaining the critical amplitude of vibration making the powder flow and the mass flow rate as a function of the amplitude of vibration.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Flowability of Composite Particles and Powder Mixtures by a Vibrating Capillary Method

Jiang

Matsusaka

Masuda

et al. 2006

J. Chem. Eng. Japan

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Flowability of micrometer-sized particles treated with nanometer-sized particles has been studied by a vibrating capillary method. Two different types of treatments, i.e. dry particle coating based on the mechanofusion and simple mixing through shaking manually, were adopted to prepare composite particles and powder mixtures, respectively. The micrometer-sized core particle was polymethylmethacrylate (PMMA), and the coating nano-particles were TiO 2 , Al 2 O 3 , or SiO 2 . Surface morphology of the treated particles was * To whom correspondence should be addressed. E-mail: matsu@cheme.kyoto-u.ac.jp 2 analyzed by digital processing of SEM photographs, and flow behavior of powders in the vibrating capillary tube was studied with particular attention to the effects of the kind of nano-particles, its concentration, and the treatment method. Two factors were introduced to evaluate the flowability; one is the critical amplitude of vibration making the powder flow, and the other is the mass flow rate as a function of the vibration amplitude. The experimental results show that the mechanofusion treatment gave a remarkable improvement in the powder flowability evaluated by the two factors mentioned above. The general tendency of the improvement can be explained by the projected-area ratio defined as the ratio of the total projected-area of nano-particles adhering to core-particle surface and the projected-area of the core-particle itself.

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“…Therefore, PFA is a mixture of both dust and micron-and submicron-size spherical particles. Parker describes the distribution in size as a log-normal [8]. The median is given as 10 µm; the mode is 5 µm.…”

Section: Powder Propertiesmentioning

confidence: 99%

Removal of Electrostatically Deposited Powders Using High Intensity Low Frequency Sound Part 1: Experimental Deposition and Removal

Seiffert

Gibbs

2010

Journal of Low Frequency Noise, Vibration and Active Control

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This paper describes the controlled removal of powder layers using high intensity low frequency sound. The research has an industrial application, the cleaning of electrostatic precipitator filters in coal-fired power stations. The aim of the work is to quantify the sound pressure level and frequency content required to overcome adhesive and cohesive bonding forces formed when powder is electrostatically deposited onto a metal surface. In this, the first of two papers, a repeatable method for electrostatically depositing powder layers on to a metal surface is described. The design, construction and calibration of a high intensity wave tube also are described. The measured sound pressure level required for removal is compared with prediction. Measurements in a reverberant acoustic field using commercially available acoustic cleaning systems also are reported.

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Experimental and analytical study of ultrasonic micro powder feeding

Cited by 36 publications

References 16 publications

3D printing of multiple metallic materials via modified selective laser melting

3D printing of multiple metallic materials via modified selective laser melting

Evaluation of Flowability of Composite Particles and Powder Mixtures by a Vibrating Capillary Method

Removal of Electrostatically Deposited Powders Using High Intensity Low Frequency Sound Part 1: Experimental Deposition and Removal

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