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mold materials

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Published: 01 November 2010
Fig. 2.12 The most useful cavity mold type for mounting composite materials. A single mold can last for many samples. Each time one is used, it should be release-coated for easy sample removal and extended life. For producing samples for transmitted-light analysis ( Chapter 6 ), this mold More
Image
Published: 01 November 2010
Fig. 2.14 Photograph of mounted composite materials after removal from a rubber mold. This figure shows a polished top surface. More
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Published: 01 November 2019
Figure 16 High magnification (FIB) of the interface pin-to-mold on a good sample (left image) versus a sheared-stitch-bond-sample (right image). The filling of the blue-arrow-indicated line consists of molten mold material More
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Published: 01 August 2018
Fig. 17.107 Malleable cast iron, as cast (before the malleabilization heat treatment). The region close to the surface (to the right of the image) shows the formation of graphite due either to deviation in chemical composition or changes caused by the mold material. Courtesy of J. Sertucha More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000111
EISBN: 978-1-62708-313-3
... is hafnium, which improves ductility, thus reducing hot tearing during solidification. Tantalum also reduces hot tearing, whereas high levels of chromium increase hot tearing. The main drawback to adding hafnium is that it is a very reactive element that attacks mold materials and furnace linings, leading...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140021
EISBN: 978-1-62708-335-5
... at high temperature to remove all free water and organic materials and to cure the binding system being used. Molds are typically preheated and poured under partial vacuum. Christmas-tree gating systems are employed to produce small multiple parts in one mold. Aluminum investment castings can have...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200001
EISBN: 978-1-62708-354-6
... sand and a heated pattern to produce a fused sand mold with excellent detail and dimensional accuracy. Energy and material costs are higher than green sand. This process is not suitable for larger castings. Chemically Bonded Molding Chemically bonded molding uses sand and various chemicals...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740047
EISBN: 978-1-62708-308-9
..., brakes, steering and suspension components, etc.), prosthetics, and gas turbine engine hardware. The steps in making a casting are diagrammed in Fig. 1 . Before a casting can be made, a mold must be made. The mold is usually made of a material with a higher melting point than that of the alloy...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.tb.atia.t59340083
EISBN: 978-1-62708-427-7
... less than 1 mm to several millimeters. The rate of solidification depends on the mold material and heat extraction; for example, metal molds are highly conductive and can lead to higher cooling rates compared with sand ( Fig. 5.4 ). Although solidification is a complex phenomenon, the control...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260119
EISBN: 978-1-62708-336-2
..., respectively. Types of Molds Mold materials requirements include factors such as lightness, good machinability, and good thermal conductivity. Aluminum alloys 6061 and 5052 are suitable mold materials. The cooling system of a DC mold is designed so that the cooling water first comes in contact...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250077
EISBN: 978-1-62708-345-4
... limited as to top operating speed, and were not considered able to transmit motion to a high degree of accuracy. However, improved materials with higher load capacities, advances in mold design and molding technology, and the development of reliable engineering data have led to the successful...
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Published: 30 April 2020
Fig. 11.8 This automotive rotational position sensor consists of two materials molded into one device. The center portion is nonmagnetic stainless steel, while the outer wings are magnetic stainless steel. More
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Published: 01 October 2012
Fig. 12.13 Relative materials properties and costs. SMC, sheet molding compound. Source: Ref 12.21 More
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2023
DOI: 10.31399/asm.tb.ceeg.t59370001
EISBN: 978-1-62708-447-5
... to be recycled are the main characteristics that make sand the most suitable and economical material for molds. In the green sand-molding process, sand is bonded with clay and water and compacted to achieve the strength and rigidity needed for retaining the shape of the mold while the metal is poured. Hollow...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900167
EISBN: 978-1-62708-350-8
...; insufficient time at cure temperature; increased surface area of powdered materials Use proper molding pressure; increase cure time. With powders, quickly seal mold closure and apply pressure to eliminate localized curing. Thermoplastic resins Cottonball Powdered media did not reach maximum...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200164
EISBN: 978-1-62708-354-6
... and cured in a heated mold at 300 to 535 °F (150 to 280 °C) for 10 to 30 seconds to produce a strong bond. The patterns are heated to approximately 500 °F (245 °C) with some temperature fluctuations during each mold cycle. The pattern material must resist warpage and cracking and preferably have a high...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550325
EISBN: 978-1-62708-307-2
..., polycarbonate; PBT, polybutylene terephthalate. Source: Ref 7.2 Mold shrinkage is reduced with the addition of glass fibers. Although a single shrinkage value is usually listed, the addition of glass fibers typically induces anisotropic flow in the material. The result is a significant difference...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.9781627083355
EISBN: 978-1-62708-335-5
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870285
EISBN: 978-1-62708-314-0
... consisting of chopped strands of glass fiber in combination with a resin, in either sheet form (sheet molding compound) or bulk form (bulk molding compound). A “charge” of these compounds is placed in a matched metal mold and cured under heat and pressure. During cure the material flows to fill the mold...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240095
EISBN: 978-1-62708-251-8
... material to help the slurry dry faster and ensure adhesion between subsequent layers. The dipping and stuccoing process is repeated until the desired thickness is obtained, usually 6 to 8 times. When the mold is completely dry, it is placed in an oven, and the wax is melted out. The ceramic mold...