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.

Preparation method of wear-resistant microsphere catalyst for acrylic acid (ester) fluidized bed

Abstract: The invention relates to a preparation method of a wear-resistant microsphere catalyst for an acrylic acid (ester) fluidized bed. The preparation method comprises the following processing steps: slurry preparation, spray forming, drying and activated roasting. A catalyst which is suitable for the fluidized bed, is good in abrasive resistance and is used for preparing acrylic acid (ester) is prepared by a spray drying technology. The method comprises the following specific operations: mixing one of a cesium (Cs) salt, a barium (Ba) salt, a strontium (Sr) salt, a magnesium (Mg) salt and a vanadium (V) salt or a mixture salt thereof, a P salt, a salt of an assistant metal M, gamma-Al2O3 fine powder or pseudo-boehmite powder, a templating agent, a binder and 10%-40% (Al2O3 content) of alumina sol to prepare slurry; stirring the slurry in a stirrer for 1-10 hours, mixing the slurry evenly, and carrying out spray forming through a spray dryer to obtain 10-200micon catalyst solid microspheres; and drying the catalyst solid microspheres at 80-150 DEG C, and roasting the catalyst solid microspheres at 450-650 DEG C for 3-24 hours to obtain the required catalyst. The catalyst prepared by the method is relatively high in activity, good in abrasive resistance, uniform in active component distribution and long in service lifetime.

Substrate system for spray forming

Abstract: A substrate system for receiving a deposit of sprayed metal droplets including a movable outer substrate on which the sprayed metal droplets are deposited. The substrate system also includes an inner substrate disposed adjacent the outer substrate where the sprayed metal droplets are deposited on the outer substrate. The inner substrate includes zones of differing thermal conductivity to resist substrate layer porosity and to resist formation of large grains and coarse constituent particles in a bulk layer of the metal droplets which have accumulated on the outer substrate. A spray forming apparatus and associated method of spray forming a molten metal to form a metal product using the substrate system of the invention is also provided.

Successive Spray Forming and Selective Heat Treatment of Composite Tool Steels

Abstract: In many metal forming applications, especially in micro cold forming, the tools are loaded differently in various functional regions. Tailored material properties in the specific regions a...

Hot Deformation Simulation of Spray Formed 7055 Aluminum Alloy

Abstract: The hot deformation behavior of spray formed 7055 aluminum alloy was investigated in this paper. Hot compression deformation was performed on Gleeble-3500 thermal-mechanical simulator at strain rate of 0.001-5s-1 and deformation temperature of 573-723K. The result shows that the flow stress of spray formed 7055 aluminum alloy is increased with the increasing of strain rates, while decreased with the increasing of the deforming temperature. The maximum temperature rising induced by deformation heat is 25K during the test at strain rate of 5s-1, and the corrected flow stress is 20MPa higher than measured value. A flow stress constitutive equation is constituted based on Arrhenius hyperbolic sine function containing the Z parameter, and the hot deformation activation energy is 146.91kJ·mol-1. The average absolute relative error (Er) is introduced to evaluate the performance of the developed constitutive equation. The value of Er is 2.89% , which proves the developed constitutive equation can accurately predict the flow stress of the spray formed 7055 aluminum alloy.