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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Patent•
17 Aug 2011
TL;DR: In this paper, an assisted densification ultrasonic vibration and deposition device for a spray-formed deposition billet, and relates to an ultrasonic vibrational and deposition devices, which is used for solving the problem that the deposition billets with excellent properties can be obtained after densification treatment due to the wide freezing range, high viscosity, difficulty in spreading and high possibility of gap formation during the existing fogdrop deposition process.
Abstract: The invention provides an assisted densification ultrasonic vibration and deposition device for a spray-formed deposition billet, and relates to an ultrasonic vibration and deposition device, which is used for solving the problem that the deposition billet with excellent properties can be obtained after densification treatment due to the wide freezing range, high viscosity, difficulty in spreading and high possibility of gap formation during the existing fogdrop deposition process. The assisted densification ultrasonic vibration and deposition device comprises a deposition disk (1) and a rotary motor (2), wherein, the deposition disk (1) is arranged on an output shaft of the rotary motor (2); and the device further comprises a flange (3), a piezoelectric ceramic (4) and a support disk (5) which are sequentially and fixedly connected together and sheathed on the rotary motor (2) from the top to bottom. The assisted densification ultrasonic vibration and deposition device is suitable for preparing the deposition billet during the spray forming process; and the prepared deposition billet has the advantages of high quality and good uniformity, thus being applicable to finished billets and industrial production.
TL;DR: In this article, the ageing precipitation and strengthening behavior of the spray formed Al-Zn-Mg-Cu alloy were studied by microhardness tests, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM).
Abstract: In this study, the Al-Zn-Mg-Cu alloy was prepared by spray forming process. The ageing precipitation and strengthening behavior of the spray formed Al-Zn-Mg-Cu alloy were studied by microhardness tests, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) .The results show that the main strengthening precipitates of the spray formed Al-Zn-Mg-Cu alloy are GPI (solute-rich clusters), GPII (vacancy-rich clusters) under peak aging condition. The effect of the microstructure on ageing hardness is controlled by the size and amount of the existing precipitates, and therefore depends critically on the ageing temperature and ageing time. Strength of this alloy is influenced significantly during natural ageing at room temperature, which is related to the dominant formation of GPI. During the initial stage of artificial ageing at 120°C, strong age-strengthening response is due to the formation of GP zones (both GPI and GPII ) .During later stages of artificial ageing , GPII precipitation is accelerated significantly but GPI is not affected clearly.
Patent•
02 Jan 2013
TL;DR: In this article, a spray forming pouring method is described, in which a pouring pipe is arranged in a tundish and is provided with taper, and the lower part of the pipe is inserted into a drainage pipe.
Abstract: The invention discloses a spray forming pouring method. A pouring pipe is arranged in a tundish and is provided with taper; the lower part of the pouring pipe is inserted into a drainage pipe; the pouring pipe is a refractory material piece; high-temperature molten steel is injected into the tundish and flows to the drainage pipe along the bottom of an inner cavity of the tundish; because the pouring pipe is inserted above the drainage pipe, the molten steel is accumulated in a cavity between the pouring pipe and the drainage pipe; initial stream of the molten steel is accumulated in the cavity and is preheated in the drainage pipe, and the initial molten steel is subjected to temperature compensation through the subsequent molten steel, so that the overall temperature of the molten steel is raised, the molten steel is accumulated, and the impact strength in the injection process is relieved; and therefore, steel slag generated by turbulence flow is mixed inside the tundish and upwards floats, after the liquid level height of the accumulated molten steel exceeds the pouring pipe, the molten steel uniformly flows into the pouring pipe through an orifice above the pouring pipe, is drained to the drainage pipe from the pouring pipe, and finally flows out of the drainage pipe.
TL;DR: In this paper, the microstructure of an as-deposited alloy is fine and homogeneous and in-situ TiC particles prevent the unsteady phases from coming into being.
Abstract: Heat-resistant Al-Fe-V-Si aluminum alloys enhanced by in-situ TiC particles have been prepared by spray forming process with suitable process parameters. Research results show that the microstructure of as-deposited alloy is fine and homogeneous. In-situ TiC particles prevent the unsteady phases from coming into being. On the other hand, the TiC particles increase the volume fraction of heat-resistant phases. So the mechanical properties of the enhanced alloy by in-situ TiC particles are better than that of Al-Fe-V-Si alloy without TiC particles. The hot extrusion temperature is also an important parameter to understand. Under the permission, it is better to extrude the alloy at lower temperature. The tensile strength of the alloy without TiC particles is about 435MPa at room temperature and is about 204MPa at 350°C. However, when the alloy is enhanced by in-situ TiC particles, the strength of alloy is about 482MPa at room temperature and is about 224MPa at 350°C temperature.
01 Jan 1997
TL;DR: In this article, the effect of process variables during spray forming of a commercial Babbit alloy containing Pb74,Sn12,Sb11.5,Cu1.25,NiO on its microstructure and wear characteristics were investigated.
Abstract: The effect of process variables during spray forming of a commercial Babbit alloy containing Pb74—Sn12—Sb11.5—Cu1.25—NiO.75—Cd0.3—As0.2 on its microstructure and wear characteristics were investigated. Variation in atomization gas pressure from 0.6 to 1.2 MPa and nozzle to substrate distance from 0.2 to 0.4 m revealed considerable change in the nature of porosity and microstructural features of the spray deposits. The process variables during spray deposition were optimized to achieve microstructural homogeneity and refinement in second phase particles of this alloy. The wear study of both the spray formed and as-cast alloy under an applied load of 10 to 70 N and sliding velocity of 0.2 to 1.5 ms~1 indicated two distinct regimes of mild and severe wear. In both the regimes, the spray-formed alloy consistently indicated a low wear rate compared to that of the as-cast alloy. In addition, the mild wear regime of the spray-formed alloy was extended to higher load and sliding velocity. Wear characteristics of the spray formed alloy is discussed in light of its microstructural features induced during spray deposition processing.