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spray cast preforms

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By P.S. Grant
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005225
EISBN: 978-1-62708-187-0
... Abstract Spray casting, also known as spray forming, is a niche casting process for the manufacture of preforms. This article lists commercial examples of alloys manufactured by spray casting and provides sequential steps of the spray casting process. Gas atomization is a chaotic, stochastic...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006488
EISBN: 978-1-62708-207-5
... metalworking techniques, such as extrusion and forging. Wrought aluminum MMCs typically contain less than 40 vol% reinforcement. These composites are manufactured by preparing a billet or an ingot, which is subsequently forged, rolled, or extruded. The billet can be produced using casting, spray forming...
Image
Published: 01 December 2008
Fig. 4 (a) Typical 25 kg (55 lb) development-scale spray cast Al-5.35Mg-1.2Li-0.28Zr preform. (b) orresponding as-cast microstructural orientation map obtained by electron backscattered diffraction showing the noncolumnar/dendritic equiaxed polygonal grains characteristic of the spray casting More
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003420
EISBN: 978-1-62708-195-5
... of graphite/epoxy, in which components are molded in an open-faced tool. The mold in this case is a self-heating, slip cast ceramic tool that contains the profile of the finished part. A plasma-sprayed aluminum preform is laid into the mold, heated to near molten aluminum temperature, and pressure...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004024
EISBN: 978-1-62708-185-6
... and performance. The process is relatively cheap and fast. Indirect rapid tooling technologies use a two-step process to create tooling. First, they create a master geometry from the computer model. This master is used as a mold to cast, spray, or free form the actual tooling. In the second step, they can use...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003163
EISBN: 978-1-62708-199-3
...-matrix composites, superalloy-matrix composites, and intermetallic-matrix composites. It describes the processing methods of discontinuous aluminum MMCs which include casting processes, liquid-metal infiltration, spray deposition and powder metallurgy. The article provides useful information on aluminum...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005249
EISBN: 978-1-62708-187-0
... for the production of composite molds: a set of oversized preform patterns for molding the coarse backup material and a second set of patterns, representative of the dimensional accuracy desired in the casting, for molding the ceramic facing. Thus, for cope-and-drag molding, a total of four patterns may be required...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002465
EISBN: 978-1-62708-194-8
... is parallel to the mold centerline or to the mold surfaces. Thin-Shell Molding by Blow Molding, Rotational Molding, or Slip Casting Thin-shell molding by blow molding, rotational molding, or slip casting uses a liquid resin plus a preform of fiber in a resin matrix that is cured with a temperature...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001101
EISBN: 978-1-62708-162-7
... processing techniques have been investigated for use in the production of cast particle Gr/Al for applications needing an inexpensive antifriction material ( Ref 35 ). Discontinuous Al 2 O 3 /Al MMCs are made using short fibers, particles, or compacted staple fiber preforms as reinforcements...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006080
EISBN: 978-1-62708-175-7
... to full, or nearly full, density. Both processes occur within a die that gives shape to the final densified component. At a more detailed level, forging and hot pressing are significantly different. Forging involves the deformation of a powder preform in which considerable lateral flow occurs ( Fig...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001451
EISBN: 978-1-62708-173-3
... Abstract Cast irons and carbon steels are brazeable materials, although the brazeability of cast iron is lower than that of carbon steel. The article provides a detailed discussion on the brazeability of different types of cast iron (malleable iron, ductile iron, and gray iron), carbon steels...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005745
EISBN: 978-1-62708-171-9
... also be improved through the use of high-temperature wear and corrosion-resistant coatings. Examples include conveyer rollers, bearing boxes, and ladle pivots. Casting Salvage Casting salvage is another area in which thermal spray operations contribute to the foundry industry. Large castings...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005227
EISBN: 978-1-62708-187-0
..., or centrifugal casting, or by novel techniques such as squeeze casting (liquid forging), spray codeposition, melt spinning, or laser-engineered net shaping processing. Many of these casting techniques are covered in detail in other articles in this volume some typical squeeze casting parameters are shown...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005740
EISBN: 978-1-62708-171-9
... composites bore Linerless solution, regular heat transfer, but expensive Cast-in ceramic-fiber preform Etching processing required to improve antiscuffing property Longer casting time to make aluminum permeate between fibers 6 Thermal spraying on bore surface Linerless solution, regular heat...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003350
EISBN: 978-1-62708-195-5
... polymers, where the discontinuous phase is more compliant and more ductile than the polymer, resulting in improved toughness. Similarly, steel wires have been used to reinforce gray cast iron in truck and trailer brake drums. Composites are commonly classified at two distinct levels. The first level...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003413
EISBN: 978-1-62708-195-5
... circulation are used commonly. Steam, water, and oil require a circulating path in the mold body. In the case of shell molds, pipes can be added to the rear face of the shell, while they can be cast-in-place for ceramic, Kirksite, or metal spray molds. Gun drilling is generally used to transport the fluid...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004005
EISBN: 978-1-62708-185-6
... in inches Steel was extrusion-quality 1039 in 42.9 mm (1 11 16 in.) diam bars. The bars were sheared to lengths of 757 to 929 mm (29 13 16 to 36 9 16 in.), then hot forged and shot blasted. A continuous conveyor took the hot upset preforms through a hot alkaline spray...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003988
EISBN: 978-1-62708-185-6
... preform is densified by forging in a single blow. Heat facilitates the densification and deformation aspects of the process in producing a net or near-net shape. Typically, forging is performed in heated, totally enclosed dies, and virtually no flash is generated. This contrasts with forging of cast...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001315
EISBN: 978-1-62708-170-2
... is still widely practiced. Often buffed die castings are sprayed with, or dipped in, the hot solvent and then subjected to vapor degreasing to remove the last traces of grease and compound. This method is effective provided that adequate measures are taken to remove the fine abrasive and metallic particles...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006112
EISBN: 978-1-62708-175-7
... to 140 ksi). Preforms may be graphite coated to prevent oxidation and decarburization during reheating and transfer to the forging die. The dies are typically made of hot-work steels such as AISI H13 and H21. Lubrication of die and punches is usually accomplished by spraying a water-graphite suspension...