Topic
Spray forming
About: Spray forming is a research topic. Over the lifetime, 1153 publications have been published within this topic receiving 12869 citations. The topic is also known as: spray casting & spray deposition.
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TL;DR: In this paper, the simulation software of compressible gas flow process in spray forming equipment was developed under three-dimensional cylindrical coordinates, where the gas flow strands sprayed from some definite angles into the atomizer chamber, they converged at the definite height in axial line then expanded outside which showed the jet current characteristic.
Abstract: The simulation software of compressible gas flow process in spray forming equipment was developed under three-dimensional cylindrical coordinates. When the gas flow strands sprayed from some definite angles into the atomizer chamber, they converged at the definite height in axial line then expanded outside which showed the jet current characteristic. The substrate stagnated the divergence jet strands of gas and then separated the flow strand into two big recycle zones in whole space. One of the recycle flow zone directed downwards, the other recycle flow zone, directed upwards and reached the inlet area, which is the main reason caused the bonding of small liquid drop in the delivery hole.
1 citations
31 Dec 1996
TL;DR: In this article, the effects of the Hartman cavity on performance of the USGA (Ultrasonic Gas Atomizer) used for spray forming were investigated and it was found that Hartman cavities had little effect on droplet sizes generated; also little effect in spray development.
Abstract: This paper addresses the effects of the Hartman cavity on performance of the USGA (Ultrasonic Gas Atomizer) used for Al spray forming Numerical simulations of the gas flow field were done in order to establish effects of the cavity on flow development both inside and outside the air nozzles PDPA measurements were made of gas velocity and turbulence intensity, droplet mean and fluctuating velocity, and droplet size across planes at various distances downstream High speed imaging is used in the flow region near the orifice exit where recirculation zones are generated and there is concern about metal droplet deposition on atomizer surfaces Shadowgraphy show presence of shock waves and cells in the emerging gas jets It was found that the Hartman cavity has little effect on droplet sizes generated; also little effect on spray development The rectangular slit orifices for the 2 gas jets and the liquid jet generate a spray, after impingement, which is somewhat rectangular in cross section As the spray develops downstream, it changes shape under influence of entrainment from the gas surrounding the spray After a distance of 254 mm from nozzle exit, width and breadth of the jet are equal but significant shape change occur further downstream Gaussian velocity distributions result in liquid flux distributions and metal deposits with Gaussian shapes instead of deposits with uniform thickness
1 citations
Patent•
09 Sep 2015
TL;DR: In this article, a spray-formed tool steel is described, which comprises the following chemical components by mass percent: 1.5%-2.5% of W, less than or equal to 3.9% of Cr, 5.0%-10.0% of Mo, 4.2%-5.9%, and balance iron and impurities.
Abstract: The invention relates to a spray formed tool steel, which comprises the following chemical components by mass percent: 1.5%-2.5% of C, 0.1%-0.5% of W, less than or equal to 3.0% of Mo, 4.2%-5.9% of Cr, 5.0%-10.2% of V, 1.25%-2.1% of Nb, 0.05%-0.5% of Co, less than or equal to 1.0% of Si, 0.2%-1.0% of Mn, 0.05%-0.3% of N, and the balance iron and impurities. The carbide of the spray formed tool steel is MC carbide in the type of (V, Nb)(C, N). The prepared spray formed tool steel has excellent toughness and wear resistance, can meet the needs of different application fields, and has extensive use. The tool steel provided by the invention is prepared by a spray forming process, and the alloy preparation cost is lower than that of powder metallurgy process, thus being conducive to reducing the overall cost of alloy.
1 citations
01 Jan 1994
TL;DR: In this paper, the strength of plasma sprayed MoSi{sub 2} tubes were measured via diametral compression of O-ring and C-ring sections in air at room temperature.
Abstract: Plasma-spray forming has been used to fabricate thick-wall tubes of MoSi{sub 2} and MoSi{sub 2} containing concentric layers of Al{sub 2}O{sub 3}. This process is being investigated as a potential fabrication method for producing tubular components of MoSi{sub 2} and MoSi{sub 2} composites for use in high temperature fuel-burner applications. Results are reported on spray forming method used to produce various tube sizes. Room temperature strength of pure MoSi{sub 2} tubes in the as-deposited condition, and after heat-treating at 1500 C for 2 hours in vacuum is also reported. Strength of plasma sprayed MoSi{sub 2} tubes were measured via diametral compression of O-ring and C-ring sections in air at room temperature. Prediction of the strength distribution was based on Weibull statistical theory.
1 citations
TL;DR: In this paper, a numerical model was developed to simulate the distribution of polygonal grain size in a sprayed microstructure formed from an alloy droplet spray containing a large number of solid, mushy and liquid droplets.
Abstract: A numerical model has been developed to simulate the distribution of polygonal grain size in a sprayed microstructure formed from an alloy droplet spray containing a large number of solid, mushy and liquid droplets The model takes into account the effects of: (1) the droplet size distribution; (2) its corresponding distribution of solid, mushy and liquid droplets at the instant of deposition; (3) the overall thermal condition of the spray formed preform during final solidification The model has been validated against experiments of the spray forming of Ni superalloy rings, with modelled grain size distributions giving good agreement with measurements obtained by electron backscatter diffraction
1 citations