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temperature coefficients

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Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005436
EISBN: 978-1-62708-196-2
... called the burn-out temperature, T BC . Tensi, Stich, and Totten ( Ref 21 ) indicted that increasing the surface roughness and the thermal diffusivity of the material results in an increased heat-transfer coefficient. Increasing sample diameter and oxidation decrease the measured heat-transfer...
Book Chapter

Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003799
EISBN: 978-1-62708-183-2
... Abstract This article discusses a tool for the conversion of measurements made against various reference electrodes at different temperatures. It reviews different electrode potential temperature coefficients, namely, isothermal temperature coefficient and thermal temperature coefficient. The...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005423
EISBN: 978-1-62708-196-2
... defined as: q = h ( T 2 − T 1 ) in which h is the interface heat-transfer coefficient, and ( T 2 − T 1 ) is the temperature drop across the interface ( Fig. 1 ). Hence, the interface region is not explicitly modeled but instead is treated as a zero-volume surface that...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
... Abstract High-temperature corrosion can occur in numerous environments and is affected by various parameters such as temperature, alloy and protective coating compositions, stress, time, and gas composition. This article discusses the primary mechanisms of high-temperature corrosion, namely...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005417
EISBN: 978-1-62708-196-2
... v Rolling velocity v rel Relative velocity α s Area fraction of the gaps formed from the through-thickness cracks at the interface and filled with fresh metal γ Pressure viscosity coefficient δ Temperature viscosity coefficient δ ox Scale thickness δ oxt Scale...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005789
EISBN: 978-1-62708-165-8
... coefficient initial heat-flux density liquid quenchants oil quenching polymer quenching quenching temperature gradient This section includes discussion on probes for laboratory tests and resultant curves, the scope of laboratory tests, and the calculation of the heat...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003159
EISBN: 978-1-62708-199-3
... physical properties thermal expansion coefficient LOW-EXPANSION ALLOYS are materials with dimensions that do not change appreciably with temperature. Alloys included in this category are various binary iron-nickel alloys and several ternary alloys of iron combined with nickel-chromium, nickel-cobalt...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003156
EISBN: 978-1-62708-199-3
.... The primary requirements for resistance alloys are uniform resistivity, stable resistance (no time-dependent aging effects), reproducible temperature coefficient of resistance, and low thermoelectric potential versus copper. Properties of secondary importance are coefficient of expansion, mechanical...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004025
EISBN: 978-1-62708-185-6
... temperature for some commonly used metals. Fig. 15 Differential scanning calorimetry cell Fig. 16 Specific heat versus temperature for selected nonferrous alloys (a) and steels (b). Source: Ref 12 The coefficient of thermal expansion (CTE) is simply a measurement of the strain...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001299
EISBN: 978-1-62708-170-2
... Abstract This article discusses the various tests applied to a thermal barrier coating system and to the zirconia layer to establish thermomechanical, environmental stability, and thermal design properties such as coefficient of thermal expansion, specific heat, and thermal transport properties...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009013
EISBN: 978-1-62708-185-6
... coefficient of thermal expansion (CTE) is a measurement of strain resulting from a temperature change. Instruments that measure CTE are based on a precisely controlled and highly uniform temperature furnace combined with a system for measuring the change in length of the specimen or a change relative to a...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009010
EISBN: 978-1-62708-185-6
...-tension test data, which helps to gain information on a number of material parameters and material coefficients. It details the effect of test conditions on flow behavior. The article briefly describes the detailed interpretation of data from the isothermal hot-tension test using numerical model. It also...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005824
EISBN: 978-1-62708-165-8
... thermal conductivity is temperature independent. In this case, the H -value depends only on the heat-transfer coefficient at the surface of the body ( h ) and therefore on the cooling properties of the quenchant. Instead of the Biot number, Grossmann et al. used the term HD , a dimensionless number...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
... surface, and the coefficient of friction can rise to approximately 0.1 ( Ref 29 ). However, if there is a substantial increase in load, speed, or lubricant temperature, then severe scoring will set in, with large material-transfer regions spreading quickly throughout the contact. Sometimes scoring is...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005430
EISBN: 978-1-62708-196-2
... interdiffusion coefficients for the nickel-tungsten system as a function of composition for temperatures ranging from 900 to 1300 °C. (a) Calculated diffusivities before optimization; observed composition dependence is entirely from the composition dependence of the chemical potentials. (b) Calculated...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005191
EISBN: 978-1-62708-187-0
... − 11.291 T 9598 − 20.517 T Sn(l)=Sn 4.68 5845 − 2.245 T 5845 − 14.333 T Zn(l)=Zn 1.92 2538 − 1.007 T 2538 − 11.911 T Source: Ref 5 Table 21 Interaction coefficients for elements in liquid aluminum i j ε j i Temperature, K Ag Ag −3.1 1273...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005415
EISBN: 978-1-62708-196-2
... temperature and pressure. To present them in tractable forms for practical modeling, one generally must (1) choose appropriate base functions to represent these quantities, and (2) determine the coefficients in the base functions by fitting the free energy and mobilities to thermodynamic and mobility...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005968
EISBN: 978-1-62708-166-5
... well as the importance of time, and temperature control in heat treatment. Temperature Uniformity Survey, a testing procedure intended to map variations in temperature throughout the furnace work zone, helps in precise control of temperature. The article focuses on the measuring instruments used to...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0004050
EISBN: 978-1-62708-183-2
... Low vapor pressure, to resist evaporation Oxide film and metal have close to the same coefficients of thermal expansion (CTE) Oxide film has high-temperature plasticity, to accommodate differences in specific volumes of oxide and parent metal and differences in CTE Oxide film has low...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003239
EISBN: 978-1-62708-199-3
... temperature coefficient of a bolometer is from 0.3 to 0.5%/°C. A thermocouple consists of a junction of two dissimilar metals. As the junction temperature is raised, a thermoelectric electromotive force is produced. Thermocouples are always used in pairs in a bridge circuit so that the measured...