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.

Multi-mode electro-hydro dynamics spray forming device and control method thereof

Abstract: The invention discloses a multi-mode electro-hydro dynamics spray forming device and a control method of the multi-mode electro-hydro dynamics spray forming device. The multi-mode electro-hydro dynamics spray forming device comprises a machine frame, a bearing platform, a liquid spraying module, a platform conversion mechanism and a pattern forming platform. A gap groove is formed in the middle of the bearing platform. The liquid spraying module is arranged on the bearing platform through an X-axis sliding mechanism and the Z-axis sliding mechanism and provided with a liquid spraying mechanism used for spraying solution. The liquid spraying mechanism is used for spraying the solution to a substrate to conduct pattern formation. The platform conversion mechanism is arranged on the bearing platform through a Y-axis sliding mechanism. The platform conversion mechanism comprises two supporting pieces which are in bilateral symmetry and arranged on a Y-axis sliding mechanism in a sliding manner. A rotating shaft is arranged between the supporting pieces. A plurality of pattern forming platforms are axially distributed along the rotating shaft. The pattern forming platform can change the position along with rotation of the rotating shaft. Through the arranged rotatable platform conversion mechanism, the pattern forming platforms are switched through the control method of the multi-mode electro-hydro dynamics spray forming device, so that multi-mode spray formation is achieved, and the demand for formation of different patterns is met.

Cooling system and method for spray forming of silicon-aluminum alloy

Abstract: The invention discloses a cooling system and method for spray forming of silicon-aluminum alloy. The system is composed of a first-level deposition surface cooling system and a second-level deposition room cooling system. The deposition surface cooling system comprises a gas supplying system, gas cooling devices and spraying pipes, wherein the gas supplying system, the gas cooling devices and the spraying pipes are connected in sequence through pipelines. The deposition room cooling system comprises heat sucking devices, a cooling device, a heat conduction medium inlet distribution pipeline and a heat conduction medium outlet gathering pipeline. According to the two-level cooling method, the problem that the temperature of a deposition room and the temperature of a deposition surface are too high in the spray forming process, and consequently the solidification velocity of silicon-aluminum particles is reduced is solved, and the defects that in the prior art, the cooling efficiency is low, and the deposition surface cannot be directly cooled are overcome.

Spray forming and mechanical properties of a new type powder metallurgy superalloy

Abstract: The deposited billet of a new type powder metallurgy (PM) superalloy FGH4095M for use in turbine disk manufacturing has been fabricated using spray forming technology. The metallurgical quality of the deposited billet was analyzed in terms of density, texture, and grain size. Comparative research was done on the microstructure and mechanical properties between the flat disk preform prepared with hot isostatic pressing (HIP) and the same alloy forgings prepared with HIP followed by isothermal forging (IF). The results show that the density of the spray-formed and nitrogen-atomized deposit billet is above 99% of the theoretical density, indicating a compact structure. The grains are uniform and fine. The billet has weak texture with a random distribution in the spray deposition direction and perpendicular to the direction of deposition. A part of atomizing nitrogen exists in the preform in the form of carbonitride. Nitrogen-induced microporosity causes the density reduction of the preform. Compared with the process of HIP+IF, the superalloy FGH4095M after HIP has better mechanical properties at both room temperature and high temperature. The sizes of the γ' phase are finer in microstructure of the preform after HIP in comparison with the forgings after HIP+IF. This work shows that SF+HIP is a viable processing route for FGH4095M as a turbine-disk material.

Research on Combustion Reaction of Flying Particles during Process of Self-reactive Spray Forming Multi-phased Ceramic

Abstract: Based on the SHS reaction of Ti-B4C-sucrose system,Ti(C,N)-TiB2 ceramic preforms were prepared by self-reactive spray forming technology.The characters of combustion and SHS reaction during the spray process were investigated by water-quenching experiments and collision experiments.The results show that during the spray process,the sprayed particles transform into ceramic beads after the process of heating,surface melting and reacting.The reaction begins with the melting of titanium.And the nitridation and oxidation of titanium go with the whole spray process.Each sprayed particle acts as an individual reactive unit,and there is no macro combustion wave and surface moving in the system.Each particle reacts and transforms in the different time by its own flight track.The transforming extent of the sprayed particles depends on their temperature and size.The sprayed particles with optimal size and high temperature can all transform into ceramic beads.The relative density,micro-hardness and fracture toughness of the sprayed preforms are 97.7%,HV0.2 2029 and 6.0MPa·m1/2 respectively.

Mg65Cu25Gd10 BMG Rod and Ribbon and Composite Synthesized via Spray Forming

Abstract: Mg bulk metallic glass rod, ribbon and composite plate were synthesized via injection casting, melt spinning, and spray forming, respectively. The BMG composite plate has various microstructure combinations, from fully amorphous phase to mixture of nanocrystals, crystals and amorphous phase. XRD analyses were done on the rod and ribbon and throughout the vertical locations of the plates at the maximum thickness. Glass transition temperature (Tg) and onset crystallization temperature (Tx) were measured with DSC, and GFA (Glass Forming Ability) was estimated with various GFA models. The microhardness of the spray-formed Mg-Cu-Gd layered composite plate at various positions and Mg-Cu-Gd rod and ribbon were measured.