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•
16 Jul 2014
TL;DR: In this article, a rapid solidification aluminum alloy material and a preparation method was proposed, which comprises 6-10wt% of iron, 2-6w% of mischmetal and the balance of aluminium and inevitable impurities and is mainly used for battery current collector materials and equipment used in high-temperature corrosion environments.
Abstract: The invention relates to a rapid solidification aluminum alloy material and a preparation method thereof. The aluminum alloy material comprises 6-10wt% of iron, 2-6wt% of mischmetal and the balance of aluminium and inevitable impurities. The preparation method comprises the following steps: smelting to obtain Al-Fe intermediate alloy and Al-Re intermediate alloy; smelting pure aluminium ingots, the Al-Fe intermediate alloy and the Al-Re intermediate alloy, then pouring, cooling, demolding so as to obtain an aluminium alloy cast ingot comprising the 6-10wt% of iron and the 2-6w% of mischmetal; crushing and cleaning the alloy ingot; carrying out spray forming so as to prepare the aluminium alloy round ingot; carrying out hot-pressing densification on the aluminium alloy round ingot so as to obtain the densification spraying deposition aluminium alloy which is the rapid solidification aluminum alloy material. Compared with the prior art, the rapid solidification aluminum alloy material prepared by the method has relatively high strength and thermal stability and is mainly used for battery current collector materials and equipment used in high-temperature corrosion environments.
5 citations
TL;DR: In this article, a comparison was made in terms of microstructure, surface morphology as well as isothermal and cyclic oxidation behaviors in the air at 750°C up to 100h and 100 cycles, respectively.
Abstract: To improve the oxidation resistance of near α-titanium alloy IMI834, TiAl-(Cr, Nb, Ta) coatings were deposited by applying high-velocity oxy-fuel (HVOF) and warm spray (WS). Comparison was made in terms of microstructure, surface morphology as well as isothermal and cyclic oxidation behaviors in the air at 750 °C up to 100 h and 100 cycles, respectively. The results show that smoother and less oxidized coatings were deposited by warm spraying. The microstructure of all coatings underwent an appreciable change during the oxidation tests, as in as-sprayed state it occurred in the nonequilibrium state. It was revealed that a small difference in the initial oxidation between the two spraying processes as well as microstructure, the level of porosity and surface roughness significantly influences the oxidation kinetics of the sprayed coatings at high temperature, which should affect the service lifetime as an oxidation-resistant layer for potential applications. After exposure at 750 °C in air, rutile TiO2 was found in addition to α-Al2O3 in the oxide scale formed on the HVOF and warm sprayed coatings. However, isothermal and cyclic oxidation tests of all WS TiAl-(Cr, Nb, Ta) coatings showed improved oxidation resistance of IMI 834 as well as good adherence to the substrate alloy.
5 citations
Journal Article•
TL;DR: In this paper, the status of spray forming of high temperature structural materials was briefly reviewed, including the development of the unique spray forming plants, spray atomization-deposition process and their applications, and spray forming route for compositionally complex high-strength nickel-base superalloy disks was also compared with conventional ingot metallurgy and powder metallomics both metallurgically and economically.
Abstract: As a novel technology to directly produce preforms or semi-products of metal materials using rapid solidification technique,spray forming has been rapidly developed to process high-alloyed and hard-to-process superalloys in recent yearsThe status of the spray forming of high temperature structural materials was briefly reviewed,including the development of the unique spray forming plants,spray atomization-deposition process and their applicationsThe spray forming route for compositionally complex high-strength nickel-base superalloy disks was also compared with conventional ingot metallurgy and powder metallurgy both metallurgically and economicallySound preforms of wrought,powder metallurgy and cast superalloys could be achieved by optimising spray atomization and deposition variables using either nitrogen or argon as atomisation gasThe high-quality preforms exhibited highdensity,refined grains,homogenous microstructures,segregation-free macrostructure,low gas contents,improved workability and enhanced mechanical properties
5 citations
Patent•
03 Jun 2009
TL;DR: In this article, a spray forming liquid delivery tube adopts a brand-new liquid-drone heating mode, which can be adjusted according to practical demands, and can be changed into a ring shape, the effect of atomizing liquid metal is improved, and the deposit preform quality is improved.
Abstract: A heating device of spray forming liquid delivery tube, wherein a liquid delivery tube is located in the middle of a nozzle, the heating device of spray forming liquid delivery tube comprises a heat conduction rod which is inserted into the liquid delivery tube and is made of pure graphite materials, or graphite is arranged inside, fireproof materials are arranged outside, and the heating device of spray forming liquid delivery tube also comprises an induction heating coil arranged outside the heat conduction rod. The induction heating coil is an induction coil for heating a bakie or an induction coil singly arranged. The heat conduction rod is located in the center of the liquid delivery tube, the lower end portion is extended out from the lower end surface of the liquid delivery tube or is aligned with the lower end surface, and the position can be adjusted according to practical demands. The heating device of spray forming liquid delivery tube adopts a brand-new liquid delivery tube heating mode, the liquid delivery tube is heated to the temperature demanded by production rapidly in short time, the whole production waiting time is shortened, simultaneously, columnar liquid metal inside the liquid delivery tube is changed into a ring shape, the effect of atomizing liquid metal is improved, and the deposit preform quality is improved.
5 citations
TL;DR: In this article, the changes of microstructure and mechanical properties of the spray deposited Al-Zn-Mg-Cu alloy underwent ageing, regression and reageing treatment (RRA) was studied by scanning electron microscopy, X-ray diffraction and other methods.
Abstract: The Al-Zn-Mg-Cu (7A04) alloys were prepared by using the method of spraying forming and the hot extrusion. The changes of microstructure and mechanical properties of the spray deposited Al-Zn-Mg-Cu alloy underwent ageing, regression and reageing treatment (RRA) was studied by scanning electron microscopy, X-ray diffraction and other methods. The results show that the tensile strength of the alloy aged at 120°C for 24 hours can reach the peak value (760MPa), but the elongation is only 4.8 percent. The toughness of the alloy regression treated at 160°C for 2 hours can increase to 9.0 percent, but its tensile strength decreases greatly (680MPa). The reaging treatment at 120°C can make the tensile strength up to 740MPa, while the elongation which is 8.2 percent still keeps a higher level.
5 citations