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.

Prediction of the Flattening Ratio and Hardness of Cold Sprayed Deposits

Abstract: Cold spray technology is a solid-state deposition process where solid particles are accelerated to very high velocities by expanding a compressed gas through a supersonic nozzle. The particles impact a substrate located approximately 25 mm from the exit plane of the nozzle. Predicting the deformation and resultant properties helps in developing process parameters and tailoring coatings to get the desired properties. In this study, aluminum, copper, and nickel coatings were produced using a range of process parameters that produced different particle impact velocities. The Hollomon power law relationship and Johnson-Cook flow stress model were utilized to predict the hardness of cold spray coatings. Results showed there was good agreement between the predicted and measured hardness of the respective coatings. Additionally, a methodology was developed to measure deformation in the form of a flattening ratio of the deposited particles. There was good agreement between the predicted and measured flattening ratio, especially for the Al and Ni feedstock powders.

Preparation method of Zn-Al alloy with high wear resistance

Abstract: The invention discloses a preparation method of a Zn-Al alloy with high wear resistance The Zn-Al alloy comprises 25%-35% of Al, 05%-15% of Cu and the balance of Zn With adoption of a spray forming technology and non-restricted gas flow atomization nozzles, atomized gas sprayed by the gas flow atomization nozzles is used for spray forming of alloy melts flowing out of a flow guide pipe, and a forming product is deposited on a receiving disc of a receiving device, wherein spray forming process parameters are as follows: nitrogen is adopted as the atomized gas, the atomization pressure is 06-08 MPa, the temperature of the alloy melts is 973-1073 K, the depositing distance between the outlet of the flow guide pipe to the receiving disc is 400-500 mm, the temperature of the flow guide pipe is 973-1073 K, the scanning frequency of an atomizer is 1-5 Hz, the dropping speed of the receiving device is 20 mm/min, and the dropping angle of the receiving device is 30 degrees The method can refine the Zn-Al eutectoid phase of an alloy structure, improve the wear resistance of the alloy and eliminate massive eutectoid structures in casting alloys

Influence of Master Alloy on the Cleanliness of Spray Formed Superalloy

Abstract: Three kinds of master alloys, including scrap material, vacuum induction melting (VIM) ingot and electro slag remelting (ESR) ingot, were spray formed into different billets. The influence of master alloy on the cleanliness of spray formed superalloy was investigated by means of electron beam (EB) button melting and Scanning Electron Microscopy (SEM), on the basis of optimized process of spray forming and EB button melting. The results show that the inclusions in spray formed preform are mainly composed of alumina and magnesia, stem from master alloy and some refractory materials in the process of remelting. The cleaner the master alloy, the lower level of inclusion contents of the billet. Among three kinds of master alloys, the ESR ingot exhibit the cleanest melt surface in the process of re-melting and contains much smaller inclusions in EB button. The cleanliness of spray formed billet is better than ingot stack for deposition. Superclean sprayforming billet with smaller size inclusions (<100μm) can be attained by the ESR ingots.

Method for spray forming, atomization and heat transfer

Abstract: The present invention is directed to methods and apparatus (201) that use electrostatic and/or electromagnetic fields (203) to enhance the process of spray forming preforms or powders (8). The present invention also describes methods and apparatus for atomization and heat transfer with non-equilibrium plasmas (24). The present invention is also directed to articles, particularly for use in gas turbine engines, produced by the methods of the invention.

Research on Microstructure Evolution of Spray Forming FVS0812 Alloy Varies with Temperature

Abstract: Heat-resistant FVS0812 alloys were prepared by spray forming technique. The effect of temperature on microstructure the alloys was studied by optical microscope (OM), transmission electron microscope (TEM) with energy dispersive spectrometer (EDS), differential scanning calorimeter (DSC) in this paper. The research results show that the microstructure of the material doesnt change obviously after being hold for 3 hours at 420°C temperature. When the temperature is over 420°C, the second coarse phases are found in the alloy. The studies on the microstructure of the alloy exposed at 400°C for 100 hours show that the alloy has excellent high temperature stability.