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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20 May 2015
TL;DR: In this paper, a spray forming cooling system and a method for decreasing the temperature of an ingot blank through the spray-forming cooling system was presented. But the authors did not specify the cooling mechanism.
Abstract: The invention discloses a spray forming cooling system and a method for decreasing the temperature of an ingot blank through the spray forming cooling system. The system comprises a spray forming device and a cooling system, the cooling system comprises a heat absorption structure, a cooling device, a circulation power pump, heat conduction media and a heat conduction medium conveying pipeline which is sequentially connected with the heat absorption structure, the cooling device and the circulation power pump to form a heat condition loop. The heat absorption structure is located inside an atomization chamber of the spray forming device and used for cooling the ingot blank or a tray, and the cooling device is located outside the atomization chamber of the spray forming device and used for cooling the heat conduction media of which the temperature is increased because heat of the atomization chamber is absorbed. The heat conduction media flow inside the heat conduction loop in a circulation mode under the action of the circulation power pump to absorb heat in the atomization chamber and perform cooling inside the cooling device. The spray forming cooling system has the advantage that the heat conduction media are adopted for directly cooling the ingot blank or the tray, so that the ingot blank of which the performance meets the requirement is obtained.
2 citations
TL;DR: In this paper, a two-wavelength imaging pyrometer was developed for real-time measurement of the surface temperature distribution of a spray-formed steel billet, which was used to deposit bulk steel on a ceramic substrate in a surface temperature range of 300 degrees C to 400 degrees C, using four, twin-wire arc plasma torches.
Abstract: A two-wavelength, imaging pyrometer was developed for real- time measurement of the surface temperature distribution of a spray-formed steel billet. This new spray-forming process is used to deposit bulk steel on a ceramic substrate in a surface temperature range of 300 degrees C to 400 degrees C, using four, twin-wire arc plasma torches. These steel billets are used as tools in metal forming processes, injection molding and die casting tools, and other processes that may need hard tooling, such as the automotive industry. The steel billet must be formed with a uniform, surface temperature distribution to minimize the thermal stresses within the steel, throughout the process. The imaging pyrometer uses a near-IR InGaAs CCD camera with high quantum efficiency from 0.95 to 1.75 microns. The wavelengths of 1.40 and 1.65 microns were selected to sense the low temperature billet. The camera has a format of 320 x 240 pixels with a pixel spacing of 30 microns and an integral 12-bit A/D converter with both video and digital outputs. The design of the pyrometer provides a working distance of 2.2 meters and a field of view of 0.6 meters. This technical paper describes the calibrations and initial measurement results obtained in a spray forming facility at the Ford Research Laboratory. The calibration provided intensity ratio measurements for surface temperatures ranging from 200 degrees C to 300 degrees C, the expected range of operation. The initial measurements described here depict the surface temperature distribution of the steel billet throughout the spray forming process, typically lasting several hours.
2 citations
TL;DR: The relationship between the Gas to Melt Ratio (GMR) and the solid fraction of an evolving billet surface is investigated numerically using a recently developed integrated procedure for modelling the entire spray forming process.
2 citations
TL;DR: In this paper, a self-reactive spray forming technology was used to prepare Mn-Zn ferrite flake absorbent by self-sensitive spray forming and droplets impacted onto copperplate to achieve flake shape.
Abstract: Fe+MnO +Fe2O3+ZnO reaction system was used to prepare Mn-Zn ferrite flake absorbent by self-reactive spray forming technology. Extrinsic enthalpy (H) and adiabatic temperature (Tad) of system were calculated. The formation mechanism and electromagnetic properties of Mn-Zn ferrite flake absorbent were analyzed. The results show that Tad exceeded 1998K, self-propagation reaction can be ignited and products can be melted. The droplets impacted onto copperplate to achieve flake shape. SEM and XRD were used to characterize the morphology and phase of samples. The results show that most of flake absorbent are at 100μm wide and 10μm thick, and they are constituted by pure Mn0.5Zn0.5Fe2O4 phase with spinel crystal structure. Absorption test show that the absorbent has two absorption peaks, the minimum value of reflectivity is at -27dB and the bandwidth lower than -10dB reaches to 3.5GHz. The Mn-Zn ferrite flake absorbent provides with preferable properties, which is potential in the further investigations.
2 citations
TL;DR: In this article, a fine distribution of Mg2Si is possible by spray forming, where a coarsening of the particles can be avoided due to a higher solidification rate.
Abstract: Aluminum alloys with high Mg2Si-content (> 10%) offer the possibility of a significant decrease in density and an increase in stiffness at the same time. But these alloys can hardly be produced in casting processes, due to an oxidation and a generation of pores by high hydrogen solubility in the melt. Furthermore, the usual solidification rate is not sufficient for a fine microstructure morphology. A fine distribution of Mg2Si is possible by spray forming, where a coarsening of the particles can be avoided due to a higher solidification rate. Different aluminum alloys with high Mg2Si-content (> 10%) have successfully been produced by spray forming, extrusion and age hardening. Mg-excess as well as Si-excess has been investigated. An additional alloying with copper leads to a further increase in strength by the precipitation sequence of Al2Cu. The new light-weight aluminum alloys have been investigated regarding age hardening, physical and mechanical properties. Densities of 2.5–2.6 g/cm3 and Youn...
2 citations