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Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001468
EISBN: 978-1-62708-173-3
... Abstract This article discusses the material combinations, design details, and fabrication processes considered in the adhesive bonding or melt-fuse interface (amorphous bond) bonding method of joining resin-matrix composites to metals. adhesive bonding bolted joints bonded joints...
Abstract
This article discusses the material combinations, design details, and fabrication processes considered in the adhesive bonding or melt-fuse interface (amorphous bond) bonding method of joining resin-matrix composites to metals.
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003593
EISBN: 978-1-62708-182-5
..., the relevant salt depth and the gaseous atmosphere must be respected. The chemistry and corrosion have been studied for many fused salt systems: chlorides, fluorides, carbonates, sulfates, hydroxides, oxides, and nitrate/nitrite. In analog to aqueous solutions, each of these melts is a dominant ionic...
Abstract
Metals and ceramics exposed to high-temperature salt solutions are susceptible to a form of corrosion caused by fused salts accumulating on unprotected surfaces. This article examines the electrochemistry of such hot corrosion processes, focusing on sodium sulfate systems generated by the combustion of fossil fuels. It explains how salt chemistry, including acid/base and oxidizing properties, affects corrosion rates and mechanisms. The article also provides information on electrochemical testing and explains how Pourbaix methods, normally associated with aqueous corrosion, can be used to study fused-salt corrosion.
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003609
EISBN: 978-1-62708-182-5
... for the different metal-fused salt systems are also provided. The metal-fused salt systems include molten fluorides, chloride salts, molten nitrates, molten sulfates, hydroxide melts, and carbonate melts. The article concludes with information on prevention of molten salt corrosion. corrosion molten salts...
Abstract
This article discusses two general mechanisms of corrosion in molten salts. One is the metal dissolution caused by the solubility of the metal in the melt. The second and most common mechanism is the oxidation of the metal to ions. Specific examples of the types of corrosion expected for the different metal-fused salt systems are also provided. The metal-fused salt systems include molten fluorides, chloride salts, molten nitrates, molten sulfates, hydroxide melts, and carbonate melts. The article concludes with information on prevention of molten salt corrosion.
Book Chapter
Modeling for Polymer Additive Manufacturing Processes
Available to PurchaseSeries: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006546
EISBN: 978-1-62708-290-7
... radius, a is the initial particle radius (assuming a 1 = a 2 from Fig. 8 ), Γ is the surface energy, μ is the viscosity, and t is the sintering or fusing time. Fig. 8 Progression of coalescence of polymer particles as they melt and become liquid, which is described by the Frenkel...
Abstract
This article focuses on four industrial additive manufacturing approaches that are used to create polymer parts. The first section focuses on material extrusion, providing information on lumped-parameter material flow models and higher-fidelity models developed to estimate temperature distribution. The second section covers polymer powder-bed sintering/ fusion, discussing the different levels of scale used to address modeling and the impact of process settings: thermodynamics at the powder-bed surface, consolidation of adjacent particles in the fusion process, and fusion and molecular-level behavior within particles. The third section on vat photopolymerization (VPP) discusses two primary approaches to modeling VPP processes, namely a lumped-parameter approach to estimate cured regions in the vat, known as the Jacobs model, and a high-fidelity, continuum approach that uses finite-element methods. The final section is devoted to material jetting, focusing on simulations used to study droplet generation at the nozzle and droplet impact.
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006543
EISBN: 978-1-62708-290-7
... Abstract Powder bed fusion (PBF) of polymers is a collection of additive manufacturing processes that melt and fuse polymer in a powder bed. This article provides a complete suite of materials and processes involved in PBF of polymers. The discussion includes details of thermal...
Abstract
Powder bed fusion (PBF) of polymers is a collection of additive manufacturing processes that melt and fuse polymer in a powder bed. This article provides a complete suite of materials and processes involved in PBF of polymers. The discussion includes details of thermal and manufacturing issues, and safety, postprocessing, and finishing considerations, as well as of principal defects in PBF polymer parts and the mechanical properties of the parts produced by PBF. The article provides case studies on the applications of polymer PBF.
Book Chapter
Processing and Joining of Thermoplastic Composites
Available to PurchaseBook: Composites
Series: ASM Handbook Archive
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003425
EISBN: 978-1-62708-195-5
... options Product form Description Postimpregnated (a) Film stacked Alternating sheets of fiber and resin film stacked and melt fused together Co-woven Narrow slit film woven with fibers Co-mingled Fine resin filaments interwoven with fibers Powder coated Resin powder attached...
Abstract
Advanced thermoplastic composites possess impact resistance, fracture toughness, and elevated temperature endurance properties due to their melt-fusible nature. This article presents the material options available for thermoplastic composites such as pseudothermoplastics, post-impregnated thermoplastics, and true thermoplastics. It describes the processing methods of thermoplastic composites, including weaving, seaming, autoclaving, preconsolidation, roll consolidation, roll forming/pultruding, thermoforming, press forming, hydroforming, and diaphragm forming. The article provides information on different types of joints, namely, fastened, adhesive bonded, dual polymer bonded, co-consolidated, and welded joints. It explains the joining methods of thermoplastic composites, such as press forming, diaphragm forming, autoclaving, ultrasonic welding, resistance welding, and induction welding.
Book Chapter
Evaluation and Quality Control of Resistance-Welded Joints
Available to PurchaseSeries: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005628
EISBN: 978-1-62708-174-0
... of a peeled weld button. (b) Cross section of the same weld When the contact resistance at the electrode-sheet interface is high, excessive heating at the interface may melt the metal, which may be ejected under the electrode pressure. One example is shown in Fig. 4 ( Ref 1 ). Similar to other...
Abstract
This article presents the structural attributes and internal characteristics of spot welds as well as the commonly inspected imperfections in resistance welds. It describes the industrial requirements for weld quality. Commonly performed destructive evaluations, namely, manual testing, quasi-static mechanical tests, dynamic mechanical tests, and metallographic examination, are reviewed. The article reviews weld-quality monitoring using various process signals and provides a discussion on the on-line and off-line nondestructive evaluation methods of spot weld quality.
Book Chapter
Performance of Refractories in Severe Environments
Available to PurchaseBook: Corrosion: Materials
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003841
EISBN: 978-1-62708-183-2
.... Beneficiation is done to remove impurities, increasing potential applications of the material. Many minerals are fused or sintered to produce refractory raw materials of controlled grain size or purity, causing a balance between material cost and performance. The refractory material of today (2005) may...
Abstract
This article provides an overview of the corrosion theory relating to refractories on the basis of acid/base reactions, thermodynamics, and kinetic considerations. The tests to evaluate refractory corrosive wear are reviewed. The article describes the specific refractories used in steel, glass, aluminum, and chemical-resistant applications. Specific material issues that should be considered or evaluated when choosing or using refractory materials are discussed.
Book Chapter
Corrosion Failures of Industrial Refractories and Technical Ceramics
Available to PurchaseSeries: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003551
EISBN: 978-1-62708-180-1
... are susceptible to attack at low and intermediate temperatures. The normally protective SiO 2 layer that forms on SiC and Si 3 N 4 may explain why such ceramics have a poor corrosion resistance in basic salts. Corrosion resistance of structural ceramics to fused salts, alkalis, and low-melting oxides Table...
Abstract
This article provides a discussion on the structural ceramics used in gas turbine components, the automotive and aerospace industries, or as heat exchangers in various segments of the chemical and power generation industries. It covers the fundamental aspects of chemical corrosion and describes the corrosion resistance characteristics of specific classes of refractories and structural ceramics. The article also examines the prevention strategies that minimize corrosion failures of both classes of materials.
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
... between room temperature and 1205–1580 °C (2200–2875 °F). Source: Ref 2 Figure 1 shows a cross section of the interface of a joint made by the silver brazing of cast iron to carbon steel. The cast iron had been cleaned by the fused-salt method described in the section “Cleaning and Fixturing...
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, and dissimilar metals. It describes the factors considered in the selection of filler-metal for cast iron and carbon steel brazing, such as temperature and environment, brazed joint design, heat source, and heat-treatment requirements. The article also discusses the basic considerations in cleaning and fixturing procedures, filler metal and flux/atmosphere feeding procedures, and the heating methods of cast iron and carbon steel brazing.
Book Chapter
Corrosion Failures of Industrial Refractories and Technical Ceramics
Available to PurchaseBook: Corrosion: Materials
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 31 January 2025
DOI: 10.31399/asm.hb.v13b.a0007042
EISBN: 978-1-62708-183-2
... poor corrosion resistance in basic salts. Corrosion resistance of structural ceramics to fused salts, alkalis, and low-melting oxides Table 2 Corrosion resistance of structural ceramics to fused salts, alkalis, and low-melting oxides Ceramics at purity (>99.5%) Resistance to indicated...
Abstract
This article provides a discussion on the corrosion of industrial refractory materials and technical ceramics. These materials, which are used to minimize heat losses and provide a barrier between the vessel and its contents, are utilized in the metallurgical, chemical process, power generation, automotive, and aerospace industries. The article covers the fundamental principles of chemical corrosion of refractories and ceramics, and the use of thermodynamic calculations and kinetic models to evaluate the probability of the occurrence of corrosion-causing chemical reactions. It describes the corrosion resistance characteristics of specific classes of refractories and structural ceramics. The article also examines the prevention strategies that minimize corrosion failures of both classes of materials.
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001384
EISBN: 978-1-62708-173-3
... is completed without having fully melted metal at the interface when the correct combination of force, power, and time parameters are used. Interface temperature rise is greater for metals with low thermal conductivity (for example, steel) than it is for metals of high conductivity (for example, aluminum...
Abstract
This article begins with a discussion on the advantages and limitation of ultrasonic welding (USW). It describes variations of the USW process which can produce different weld geometries. These variations are helpful in producing spot welds, line welds, continuous seam welds, ring welds, and microelectronic welds. The article provides information on the functions of USW personnel and describes the special conditions in USW which include the condition of the surface, the use of an interlayer, and the control of resonance. It concludes with a description on the weld quality, the influencing factors, surface appearance and deformation, and metallographic examination.
Series: ASM Handbook
Volume: 23A
Publisher: ASM International
Published: 12 September 2022
DOI: 10.31399/asm.hb.v23A.a0006900
EISBN: 978-1-62708-392-8
... Limitations Fused deposition modeling Abrasion resistance consistent with neat material Amorphous and semicrystalline materials can be processed. Minimal chemical or thermal postprocessing Filaments must be produced before printing. Temperature process based on melting General low...
Abstract
The application of three-dimensional printers can be revolutionary as a tool for the customization and personalization of pharmaceutical dosage forms. The areas of 3D printing applicable to pharmaceutical manufacturing can be segregated into three categories: extrusion technologies, powder-bed fusion, and stereolithography. Common extrusion-based technologies are fused deposition modeling and pressure-assisted microsyringe; powder-bed fusion is separated by binder jet and selective laser sintering. The synergies between pharmaceutical, or active pharmaceutical ingredient (API), and polymer printing are discussed in this article, with particular attention to how the incorporation of small-molecule APIs changes the material selection, design considerations, processing parameters, and challenges associated with each technology.
Book Chapter
Traditional Applications for Ceramics
Available to PurchaseSeries: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003051
EISBN: 978-1-62708-200-6
... bonding of the constituents; thus, it determines the strength of the unit. A product with a high amount of fused material is called vitreous , while products with lesser amounts are termed semivitreous. The boundary between vitreous and semivitreous is indefinite and changes with product type...
Abstract
Traditional ceramics, one of two general classes, are commonly used in high-volume manufacturing to make building materials, household products, and various industrial goods. Although there is a tendency to equate traditional ceramics with low technology, sophisticated processes and advanced manufacturing techniques are often used where these materials are employed. This article examines several traditional ceramics, including structural clay, whiteware, glazes, enamels, portland cements, and concrete. It also provides a detailed account of fabrication methods, properties, and applications. As an example, common applications for structural clay include facing materials, load-bearing units, pavers, and ceramic tiles.
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001332
EISBN: 978-1-62708-173-3
..., intimate interfacial contact is achieved by interposing a liquid of substantially similar composition as the base metal. If the surface contamination is soluble, then it is dissolved in the liquid. If it is insoluble, then it will float away from the liquid-solid interface. Energy-Source Intensity...
Abstract
Welding and joining processes are essential for the development of virtually every manufactured product. This article discusses the fundamentals of fusion welding processes, with an emphasis on the underlying scientific principles. It reviews the role of energy-source intensity and the width of the heat-affected zone in fusion welding processes. The article contains figures from which the properties of any heat source can be estimated readily.
Book Chapter
Carbide- and Boride-Based Thick Coatings for Abrasive Wear-Protection Applications
Available to PurchaseSeries: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006364
EISBN: 978-1-62708-192-4
... with respect to material fracture toughness and hardness. MMC, metal-matrix composite; FTC, fused tungsten carbide. Source: Ref 12 Figure 1 shows that microploughing (e.g., in pure metals) and microcutting (e.g., steels, hard alloys) occur if soft or medium-hard materials with a sufficient fracture...
Abstract
This article provides a brief introduction to abrasive wear-resistant coating materials that contain a large amount of hard phases, such as borides, carbides, or carboborides. It describes some of the commonly used methods of producing thick wear-resistant coatings. The article also provides information on metal-matrix composites and cemented carbides. The three base-alloying concepts, including cobalt-, iron-, and nickel-base alloys used for wear-protection applications, are also described. The article compares the tribomechanical properties of the materials in a qualitative manner, thus allowing a rough materials selection for practitioners. It presents a brief discussion on hot isostatic pressing (HIP) cladding, sinter cladding, and manufacturing of thick wear-resistant coatings by extrusion or ring rolling. The article also discusses the processing sequence of thick wear-resistant coatings, namely, compound casting, deposition welding, and thermal spraying.
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005632
EISBN: 978-1-62708-174-0
... of these two methods has distinct advantages depending on the application. Powder Bed Methods Powder bed methods raster or direct the laser beam across a bed of powder material to selectively melt and fuse the material by turning the laser beam on and off. The powder bed is indexed downward, and a new...
Abstract
Laser deposition involves the articulation of a laser beam and the introduction of material into the beam path to fuse the material onto a substrate or into a functional shape. It can be divided into two broad categories: cladding and near-net shape processing. This article provides a discussion on the material combinations, characteristics of laser cladding, and the comparison with arc cladding. It reviews the characteristics and applications of near-net shape processing and explains the process involved in powder bed methods and direct powder methods.
Book Chapter
Material Aspects of Additively Manufactured Medical Devices
Available to PurchaseSeries: ASM Handbook
Volume: 23A
Publisher: ASM International
Published: 12 September 2022
DOI: 10.31399/asm.hb.v23A.a0006862
EISBN: 978-1-62708-392-8
...-by-layer material deposition through an extrusion printhead ( Ref 88 ). The material-extrusion-based AM processes can be classified into two broad groups, which involve material melting and deposition at high temperatures: Fused deposition modeling/fused filament fabrication ( Ref 89 , 90...
Abstract
The article presents an in-depth discussion on the various additive manufacturing techniques such as binder jetting, directed-energy deposition, material extrusion, material jetting, powder-bed fusion, sheet lamination, and vat polymerization processes. This article then discusses the different critical material aspects of additively manufactured medical devices, beginning with the preprinting phase (material consistency and recycling), the printing phase (build orientation), and the postprinting phase (part evaluation, biocompatibility, and sterilization) with supporting materials.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001282
EISBN: 978-1-62708-170-2
... THERMAL SPRAY is a generic term for a group of processes in which metallic, ceramic, cermet, and some polymeric materials in the form of powder, wire, or rod are fed to a torch or gun with which they are heated to near or somewhat above their melting point. The resulting molten or nearly molten droplets...
Abstract
This article introduces thermal spray coatings and describes the various types of coating processes and coating devices, including the flame spray, electric-arc spray, plasma spray, transferred plasma arc, high-velocity oxyfuel, and detonation gun. It provides information on the surface preparation methods and finishing treatments of coated parts. The article also explains the tests to evaluate the coating quality and the effects of coating structures and mechanical properties on coated parts. It concludes with a discussion on the uses of thermal spray coatings.
Series: ASM Handbook
Volume: 23A
Publisher: ASM International
Published: 12 September 2022
DOI: 10.31399/asm.hb.v23A.a0006859
EISBN: 978-1-62708-392-8
...-bed fusion (PBF) is a group of additive manufacturing (AM) processes that includes selective laser sintering, selective laser melting, and electron beam melting. The PBF systems work by depositing layers of powder materials onto a print bed, which are then successively fused layer by layer to form...
Abstract
Powder-bed fusion (PBF) is a group of additive manufacturing (AM) processes that includes selective laser sintering, selective laser melting, and electron beam melting. This article explains the processes and parameters of PBF systems that are used for biomedical applications. It also presents the desirable properties of biomedical devices and the advantages of using PBF systems for biomedical applications.
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