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susceptor material selection
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Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005912
EISBN: 978-1-62708-167-2
... materials, namely, cost, temperature cycling, and the impact on the product. cladding glass induction furnaces optical fibers optical pyrometers susceptor material selection The use of induction heating in the processing of bulk glass ingots—optical fiber preforms—into optical fiber...
Abstract
The optical fiber preform is a long cylinder of glass that contains core and cladding glasses. This article describes the relationship between the peak furnace temperature, fiber draw tension, and fiber draw speed. It focuses on temperature requirements such as product viscosity, hot zone length, temperature profile, and heating cycle to draw the glass. The article provides information on process gases in the draw induction furnace, insulation package for induction heating operations, and furnace design and scalability. It reviews the key factors for the selection of susceptor materials, namely, cost, temperature cycling, and the impact on the product.
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005920
EISBN: 978-1-62708-167-2
... define a glass composition, the weight percent or mole percent of the raw materials is listed to give the glass formula: for example, 76SiO 2 -14Na 2 O-10CaO is a soda-lime-silicate composition in weight percent. When initiating a glass melt, the raw material selection is important. Raw materials...
Abstract
Induction heating for glass melting is an alternative to resistance heating element furnaces. This article provides information on the basics of glass fabrication process. It focuses on crucible melt furnace for small-scale glass melting and the induction melting process. It also describes induction glass forming (forming from the melt) and glass forming by induction heating (post-melt). The article compares the benefits of using induction heating and refractory-lined resistance heating.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001284
EISBN: 978-1-62708-170-2
... and gases used in MOCVD are highly corrosive, components must be constructed of corrosion-resistant materials. Most MOCVD reactors use seamless 316 stainless steel tubing that has been electropolished inside. Selecting the proper gasket materials in fittings and valves is equally important. More information...
Abstract
This article describes the vapor-phase growth techniques applied to the epitaxial deposition of semiconductor films and discusses the fundamental processes involved in metal-organic chemical vapor deposition (MOCVD). It reviews the thermodynamics that determine the driving force behind the overall growth process and the kinetics that define the rates at which the various processes occur. The article provides information on the reactor systems and hardware, MOCVD starting materials, engineering considerations that optimize growth, and the growth parameters for a variety of Group III-V, II-VI, and IV semiconductors.
Book: Composites
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003425
EISBN: 978-1-62708-195-5
... ultrasonic or resistance. Cycle times are dependent on the melt temperature one is trying to achieve, pressure applied (material contact as melt progresses improves conduction), input power, and susceptor type. As with all localized welding techniques, pressure on the part must be maintained above...
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: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001285
EISBN: 978-1-62708-170-2
... reactors plasma-enhanced chemical vapor deposition polycrystalline silicon films PLASMA-ENHANCED CHEMICAL VAPOR DEPOSITION (PECVD), also known as plasma-assisted CVD, is an important technique used for depositing films of a wide variety of crystalline and noncrystalline materials. Examples of films...
Abstract
This article discusses the application of amorphous and crystalline films through plasma-enhanced chemical vapor deposition (PECVD) from the view point of microelectronic device fabrication. It describes the various types of PECVD reactors and deposition techniques. Plasma enhancement of the CVD process is discussed briefly. The article also describes the properties of amorphous and crystalline films deposited by the PECVD process for integrated circuit fabrication.
Book Chapter
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005834
EISBN: 978-1-62708-167-2
... minimize scale and hence material losses. The rapid heating boosts production rates. Induction heating is also useful for selectively preheating bar stock for warm and hot forming operations such as heading and upsetting. Heat Treating Induction heating is used in surface and through hardening...
Abstract
Electromagnetic induction is a way to heat electrically conductive materials such as metals. This article provides a brief history of electromagnetic induction and the development of induction heating technology. It explores various applications such as heating prior to metalworking, heat treating, melting, joining (welding, brazing/soldering, and shrink fitting), coating, paint curing, adhesive bonding, and zone refining of semiconductors. The article also discusses the advantages of induction heating.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003043
EISBN: 978-1-62708-200-6
..., electromagnetic welding, and polymer-coated material welding. adhesive bonding adhesive types assembly fastener selection considerations fusion bonding joining methods mechanical fastening polymer-matrix composites THE STRUCTURAL EFFICIENCY of a composite structure is established, with very few...
Abstract
The structural efficiency of a composite structure is established by its joints and assembly. Adhesive bonding, mechanical fastening, and fusion bonding are three types of joining methods for polymer-matrix composites. This article provides information on surface treatment and the applications of adhesive bonding. It discusses the types of adhesives, namely, epoxy adhesives, epoxy-phenolic adhesives, condensation-reaction PI adhesives, addition-reaction PI adhesives, bismaleimide adhesives, and structural adhesives. The article provides information on fastener selection considerations, including corrosion compatibility, fastener materials and strength, head configurations, importance of clamp-up, interference fit fasteners, lightning strike protection, blind fastening, and sensitivity to hole quality. Types of fusion bonding are presented, namely, thermal welding, friction welding, electromagnetic welding, and polymer-coated material welding.
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005434
EISBN: 978-1-62708-196-2
..., for protection of bulk materials against corrosion or wear, or in optical applications (e.g., spectrally selective coatings); powders and nanostructures can also be prepared. Vapor deposition processes are traditionally divided into physical vapor deposition and chemical vapor deposition processes, as further...
Abstract
This article focuses on transport phenomena and modeling approaches that are specific to vapor-phase processes (VPP). It discusses the VPP for the synthesis of materials. The article reviews the basic notions of molecular collisions and gas flows, and presents transport equations. It describes the modeling of vapor-surface interactions and kinetics of hetereogeneous processes as well as the modeling and kinetics of homogenous reactions in chemical vapor deposition (CVD). The article provides information on the various stages of developing models for numerical simulation of the transport phenomena in continuous media and transition regime flows of VPP. It explains the methods used for molecular modeling in computational materials science. The article also presents examples that illustrate multiscale simulations of CVD or PVD processes and examples that focus on sputtering deposition and reactive or ion beam etching.
Book: Powder Metallurgy
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006069
EISBN: 978-1-62708-175-7
... sintering nitrogen sintering overpressure sintering oxygen content partial-pressure sintering pressure-assisted sintering pressureless sintering sintering sintering furnaces vacuum sintering HARDMETALS (cemented carbide and cemented tungsten carbide) are classic two-phase materials consisting...
Abstract
This article discusses two major sintering methods: pressureless and pressure-assisted sintering. Pressureless sintering techniques include vacuum and partial-pressure, hydrogen, and microwave sintering. Pressure-assisted consolidation techniques include overpressure sintering, sintering followed by postsinter hot isostatic pressing, hot pressing, and several rapid hot consolidation techniques. The article describes nitrogen sintering and the sintering of cermets. It reviews the furnaces used for sintering and presents the lubrication removal techniques. The article also outlines the need to control carbon and oxygen to obtain optimal properties and explains microstructure development and grain size control.
Book: Powder Metallurgy
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006045
EISBN: 978-1-62708-175-7
... slightly exceeded the allowable limit for grade 5 Ti-6Al-4V. The chemical analysis for selected elements of the roll-compacted materials is also shown in Table 2 . Fig. 5 Ametek roll-compacted CP titanium sheet. Copyright 2005 by The Minerals, Metals & Materials Society. Reprinted...
Abstract
Consolidation of titanium powders at room temperature may be performed by low-cost conventional powder metallurgy processes. This article provides information on various consolidation methods, namely, die pressing, direct powder rolling, and cold isostatic pressing. It also describes the sintering of blended elemental powders, high-strength titanium alloys, and porous material as well as the sintering of titanium powders by microwave heating.
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005886
EISBN: 978-1-62708-167-2
... susceptors (36), and cooling fixtures (42), and (b) shows an example nickel base rotor with local temperature and grain size (ASTM grain size number) measurements noted. Source: Ref 23 Induction surface treating is commonly performed for a range of materials to increase local properties...
Abstract
This article discusses special considerations relative to induction heating of stainless steels and nickel-base superalloys. It focuses on the various industrial and high-temperature applications of induction heating to stainless steel and superalloy components, namely, primary melting processes, preheating for primary and secondary forming processes, heat treatments, brazing, and thermal processing for fusion welds. The article also provides information on computational modeling of induction heating processes for super alloys and stainless steels.
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003314
EISBN: 978-1-62708-176-4
... to accomplish closed loop control of materials testing systems in performing standard materials tests and for the development of custom testing applications. It explores the advanced software tools for materials testing. The article includes a description of baseline isothermal fatigue testing, creep-fatigue...
Abstract
This article describes the phenomena of crack initiation and early growth. It examines specimen design and preparation as well as the apparatus used in crack initiation testing. The article provides descriptions of the various commercially available fatigue testing machines: axial fatigue testing machines and bending fatigue machines. Load cells, grips and alignment devices, extensometry and strain measuring devices, environmental chambers, graphic recorders, furnaces, and heating systems of ancillary equipment are discussed. The article presents technologies available to accomplish closed loop control of materials testing systems in performing standard materials tests and for the development of custom testing applications. It explores the advanced software tools for materials testing. The article includes a description of baseline isothermal fatigue testing, creep-fatigue interaction, and thermomechanical fatigue. The effects of various variables on fatigue resistance and guidelines for fatigue testing are also presented.
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005848
EISBN: 978-1-62708-167-2
...-lamination decarburization annealing, powder metal sintering, and carbon restoration of hot worked or forged materials. Table 6 lists compositions of typical carbon-controlled atmospheres and where they are used. Compositions of carbon-controlled atmospheres for selected applications Table 6...
Abstract
Controlled atmosphere chambers are used to control the surface chemistry of the metals that are being processed. This article focuses on the various types of controlled atmospheres used in induction heat treating and brazing, namely, inert gas atmospheres based on argon and helium; prepared and commercial nitrogen-base atmospheres; and brazing atmospheres. It provides detailed information on two types of controlled atmosphere chambers: atmosphere and vacuum. The article also describes the selection factors, advantages, and disadvantages of these chambers.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003198
EISBN: 978-1-62708-199-3
... with a specific type of furnace equipment. Pots Furnace design is the most important consideration in the selection of material for pots holding molten lead or salt. Externally heated pots act as a muffle or barrier between the heating and work zones. This type of service is severe because of the great...
Abstract
Batch furnaces and continuous furnaces are commonly used in heat treating. This article provides a detailed account of various heat treating equipment and its furnace types, including salt bath equipment (externally heated, immersed-electrode and submerged-electrode furnaces), and fluidized-bed equipment (external-resistance-heated fluidized beds). It describes various auxiliary equipment used in cold-wall furnaces, namely, heating elements and pumping systems. Five types of heat-resistant alloys are used for furnace parts, trays, and fixtures: Fe-Cr alloys, Fe-Cr-Ni alloys, Fe-Ni-Cr alloys, nickel-base alloys and cobalt-base alloys. The article lists the recommended applications for alloys for parts and fixtures for various types of heat treating furnaces.
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003304
EISBN: 978-1-62708-176-4
... in the magnetic target. A graphite susceptor holder is employed to position the target and heat nonconductive materials. Ceramic foam is placed between the sample and the copper coil to confine heat to the sample. A copper tube is connected to a water line to keep its temperature low and shield electromagnetic...
Abstract
Impact tests are used to study dynamic deformation and failure modes of materials. This article discusses low-velocity impact experiments in single-stage gas guns. It describes surface velocity measurements with laser interferometric techniques. The article details plate impact soft-recovery experiments, pressure-shear friction experiments, and low-velocity penetration experiments. It reviews two types of plate impact soft-recovery experiments: normal plate impact and pressure-shear plate impact experiments. The article provides information on low-velocity penetration experiments, which include the setup for direct penetration experiment (rod-on-plate) and the reverse penetration experiment (plate-on-rod). It also considers high-temperature plate impact testing and impact techniques with in-material stress and velocity measurements.
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003175
EISBN: 978-1-62708-199-3
..., the silica content of these first two coats must be minimized, and the refractory used in the dips and stuccos is selected from materials that are thermodynamically more stable than titanium dioxide. Investment cast molds may be preheated but are not normally preheated to temperatures as high as those used...
Abstract
Aluminum alloys are primarily used for nonferrous castings because of their light weight and corrosion resistance. This article discusses at length the melting and metal treatment, structure control, sand casting, permanent mold casting, and die casting of aluminum alloys. It also covers the types and melting and casting practices of copper alloys, zinc alloys, magnesium alloys, titanium alloys, and superalloys, and provides a brief account on the casting technique of metal-matrix composites.
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003269
EISBN: 978-1-62708-176-4
... multiaxial testing fasteners mill products through-thickness tests in-plane shear tests double-notched shear test motors twist transducers torque transducers torque sensors heating systems specimen preparation THE MECHANICAL BEHAVIOR of materials under complex stresses can be evaluated...
Abstract
This article reviews the common methods of shear and multiaxial testing for the evaluation of engineering components such as fasteners and mill products. It discusses shear test methods, including through-thickness tests, in-plane shear tests, and double-notched shear test. The article provides information on torsional (rotational shear) tests as well as the basic equipment and setup of torsion testing. Motors, twist and torque transducers, torque sensors, and heating systems as well as the specimen preparation procedure are also discussed.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003054
EISBN: 978-1-62708-200-6
... include the volatilization of binders and lubricants introduced during the manufacturing process, the oxidation of organic materials that are found in many clays (especially in sedimentary clays), and reversible solid-state reactions during the firing cycle, such as phase transformations and glass...
Abstract
Sintering provides the interparticle bonding that generates the attractive forces needed to hold together the otherwise loose ceramic powder mass. It also improves hardness, strength, transparency, toughness, electrical conductivity, thermal expansion, magnetic saturation, corrosion resistance, and other properties. This article discusses the fundamentals of sintering and its effects on pore structures and particle density. It addresses some of the more common sintering methods, including solid-state, liquid-phase, and gas pressure sintering, and presents alternative processes such as reaction sintering and self-propagating, high-temperature synthesis. It also describes several pressure densification methods, including hot isostatic pressing, gas pressure sintering, molten particle deposition, and sol-gel processing. The article concludes with a section on grain growth that discusses the underlying mechanisms and kinetics and the relationship between grain growth and densification.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001287
EISBN: 978-1-62708-170-2
... rate can be carefully controlled by controlling the temperature of the source ( Ref 4 ) or by mechanically interrupting the beam ( Ref 5 ). Figure 2(a) and 2(b) shows the vapor pressure of selected materials as a function of temperature. Note that the slopes of the vapor pressure curves...
Abstract
This article discusses the fundamentals of thermal vaporization and condensation and provides information on the various vaporization sources and methods of vacuum deposition. It offers an overview of reactive evaporation and its deposition techniques. The article also explains the advantages, limitations, and applications of vacuum deposition processes. Finally, it provides information on the gas evaporation process, its processing chamber, and related systems.
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001051
EISBN: 978-1-62708-161-0
... that is now possible with serpentine cores and multiple shaped-hole film cooling ( Fig. 1 ) enables high-pressure turbine blades and vanes to operate with turbine inlet temperatures of typically 1343 °C (2450 °F), which is above the melting point of the superalloy materials. Turbine inlet temperatures as high...
Abstract
Directionally solidified (DS) and single-crystal (SX) superalloys and process technology are contributing to significant advances in turbine engine efficiency and durability. These gains are expected to arise from the development of higher creep strength and improved oxidation-resistant SX alloy compositions as well as from the development of SX casting and fabrication technology to utilize advanced transpiration-cooling schemes. This article provides a detailed discussion on the chemistry and castability of first- and second-generation DS and SX superalloys. It summarizes the chemistry modifications applied to MAR-M 247 to develop CMSX-2 with respect to function and objectives. The article also lists the nominal compositions of first- and second-generation DS and SX superalloys.
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