
	Where results make sense

Topic: Coefficient of thermal expansion

Related Topics

Thermal shock

Grashof number

Thermal conductivity

Invar

Physical compression

Reinforced concrete

Bimetallic strip

Glass

Compressive stress

Convection

Temperature gauge

Gauge

Platinum

Toughness

Space Shuttle

	Thermal expansion
		The coefficient of thermal expansion is generally defined as the fractional increase in length per unit rise in temperature.
		The former is related to the slope of the tangent to the length – temperature plot, while the latter is governed by the slope of the chord between two points on this curve.
		Determination of the thermal expansion coefficient requires the measurement of two physical quantities, displacement and temperature, for a sample of the material that is undergoing an appropriate thermal cycle.
	irc.swan.ac.uk /ThExpansion.htm (1201 words)

	thermal coefficient and thermal coefficient resources (Site not responding. Last check: )
		Evaluation of the thermal coefficient of the resistance to fluorophore rotationin model membranes.
		The accurate value of thermal expansion coefficient (a) of thin film is animportant thermal property in the design of microelectronic devices and.
		The thermal coefficient for vegetation (C) has fixed values of 1 × 10-5 thermal coefficient.For bare ground, the thermal coefficient is given by in which wsat (soil water.
	www.artcrimes.info /thermal+coefficient.html (338 words)

	Method for accounting for clamp expansion in a coefficient of thermal expansion measurement - Patent 6672759
		The predicate for the present invention is the discovery that in the course of determining the CTE of materials using a TMA, the clamps used in the TMA apparatus to hold the sample, contribute to the overall observed dimensional change of the sample.
		expansion or contraction, during the process are accounted for by fabricating the clamps from a material with a known, fixed CTE, thereby eliminating the influence of the CTE of the clamp material.
		The method of present invention for increasing the accuracy in determining the coefficient of thermal expansion of a silicon sample material using a thermal mechanical analyzer apparatus (TMA) was employed on a sample having dimensions of 20 mm length, 3 mm width and 1 mm thickness.
	www.freepatentsonline.com /6672759.html (5577 words)

	Thermal Coefficient of Portland Cement Concrete - Concrete - Research - Pavements - FHWA (Site not responding. Last check: )
		The coefficient of thermal expansion (CTE) is a measure of a material's expansion or contraction with temperature.
		The CTE of hardened cement paste, which is a function of factors such as w/c ratio, cement fineness, cement composition, and age, also affects the CTE of concrete.
		The LTPP CTE data are being used in the development of the 2002 Guide, and may also be used by future users of the guide to estimate appropriate CTE input values when material-specific data are not available.
	www.fhwa.dot.gov /pavement/pccp/thermal.cfm (800 words)

	NETZSCH Services
		The 400 Series is designed primarily for high-temperature applications in the thermal analysis of ceramics, minerals, metals, polymer composites, etc. and the determination of thermophysical properties.
		Thermal expansion of solids and, in some cases, liquids and softening behavior
		Heat flow meters are typically used to test foam, fiberglass or fill insulations used in building and home applications as well as some structural materials and moisture barrier material.
	www.4netzsch.com /products.htm (558 words)

	Coefficient of Thermal Expansion (CTE) testing laboratory. (Site not responding. Last check: )
		Coefficient of Thermal Expansion - CTE is usually defined as the fractional increase in length per unit rise in temperature.
		Coefficient of Thermal Expansion - CTE is tested by PMIC which employs the Michelson laser interferometry to measure real time coefficient of thermal expansion / contraction for maximum resolution and accuracy.
		The slope of the strain/temperature curve at a given temperature is the instantaneous coefficient of thermal expansion.
	www.pmiclab.com /wolffe/testing/cte/cte.html (378 words)

	Melles Griot Optics Guide - ZERODUR (Site not responding. Last check: )
		This Schott glass is subjected to special thermal cycling during manufacture so that approximately 75% of the vitreous material is converted to the crystalline quartz form.
		The overall linear thermal expansion coefficient of the combination is almost zero at useful temperatures.
		A comparison of the thermal expansion coefficients of ZERODUR and fused silica is shown in the figure.
	www.mellesgriot.com /products/optics/mp_3_6.htm (310 words)

	PMIC - CTE testing laboratory. Coefficient of Thermal conductivity testing laboratory. (Site not responding. Last check: )
		CTE, cte, CTE - Coefficient of Thermal Expansion, CTE testing laboratory, Coefficient of Thermal Expansion testing laboratory, index.html CTE test lab, Coefficient of Thermal Expansion test lab, CTE sample testing, Coefficient of Thermal Expansion sample testing, CTE testing, cte testing, coefficient, thermal, expansion, coefficient of thermal expansion, Advanced Materials Testing Laboratory, laser interferometry.
		Thermal Emittance Thermal Emittance ASTM.html With NASA assistance, PMIC has developed a calorimetric technique for total hemispherical emittance based on ASTM C835-95 and D.A. Jaworske "Thermal Modeling of a Calorimetric Technique for Measuring the Emittance of Surfaces and Coatings" Thin Solid Films Volume 236, pp146-152 (1993).
		Thermal Emittance Thermal_Expansion.html Thermal_Diffusivity.html Thermal_Conductivity.html Inspection Meter Techniques Based on ASTM E408-90, this method uses a radiation thermometer for temperatures of 120 to 2800 deg C and to measure emissivity from 0.2 to 1.0.
	www.pmiclab.com /thermexpa (437 words)

	Superalloys with low thermal-expansion coefficient - Patent 5192497
		The lowest coefficient of thermal expansion can be obtained depending on the balance between the contents of Ni and Co, and the sum of the two components is a very important value.
		Low coefficients of thermal expansion of the alloys of this invention are within a range lower than the coefficient of thermal expansion of the alloy, containing the sum of 1.235Ni and Co, disclosed in JP-B-41-2767.
		and has a coefficient of thermal expansion which is higher by 20% or more (not weight percent) than the coefficients of thermal expansion of the alloys of this invention.
	www.freepatentsonline.com /5192497.html (3429 words)

	Thermal Expansion Measurement of Glasses
		The thermal expansion is caused by the asymmetry of the amplitude of thermal vibrations in the glass [1].
		Thermal expansion measurements on glass are usually performed using push rod dilatometers (single push rod, or differential double push rod) [16, 17].
		Stozharov, V. Bogatyreva: "The thermal expansion coefficient and the stability of the refractive index of glasses"; Sov.
	glassproperties.com /expansion/ExpansionMeasurement.htm (1472 words)

	Thermal Expansion
		The linear coefficient of thermal expansion (a) describes the relative change in length of a material per degree temperature change.
		Thermal expansion (and contraction) must be taken into account when designing products with close tolerance fits as these tolerances will change as temperature changes if the materials used in the design have different coefficients of thermal expansion.
		It should also be understood that thermal expansion can cause significant stress in a component if the design does not allow for expansion and contraction of components.
	www.ndt-ed.org /EducationResources/CommunityCollege/Materials/Physical_Chemical/ThermalExpansion.htm (265 words)

	Alloys having low coefficient of thermal expansion and methods of making same patent invention
		A material's coefficient of thermal expansion variously refers to a change in length, area, or volume as a function of change in the temperature of the material.
		Because a material's CTE may depend on the particular temperature range in which the property is evaluated, it is often necessary to specify the temperature or temperature range when reporting the CTE of a material.
		However, although the "Invar" name was coined to allude to the alloy family's "invariable" expansion, the CTE of 36Ni/Fe alloys does vary depending on variations in composition and the temperature range in which CTE is measured.
	www.freshpatents.com /Alloys-having-low-coefficient-of-thermal-expansion-and-methods-of-making-same-dt20051215ptan20050274438.php (1918 words)

	Determination of the coefficient of thermal expansion for two Äspö rocks, diorite and granite
		The coefficient of thermal expansion can be determined in the laboratory by measuring the expansion of a sample over a temperature interval.
		The coefficient of thermal expansion (a) was then calculated by dividing the measured expansion with the temperature interval.
		The value of the volumetric coefficient is often assumed to be equal to three times the value of the axial coefficient.
	epubl.luth.se /1402-1617/2001/139/index-en.html (309 words)

	Thermal Physics [encyclopedia] (Site not responding. Last check: )
		Thermal physics is a particular interesting aspect of physics as it underlies the operation of engines and refrigeration systems.
		The temperature of the object was then a measure of the thermal energy, essentially an average of the kinetic energy of all the molecules of that object.
		Thermal action would also cause the ratchet to bounce out of place, and the skewed configuration of the gear teeth would make it more likely the gear would move in reverse if that happened.
	www.kosmoi.com /Science/Physics/Thermodynamics (7454 words)

	Coefficient of Thermal Expansion
		Materials expand because an increase in temperature leads to greater thermal vibration of the atoms in a material, and hence to an increase in the average separation distance of adjacent atoms.
		The CTE is often not the same in all axes (that is, not ‘isotropic’;).
		The CTE is rarely linear and should be quoted either at a specific temperature or as an average over a given temperature range.
	www.ami.ac.uk /courses/topics/0197_cte (729 words)

	Coefficient of Thermal Expansion ASTM E831 D696 ISO 11359
		Coefficient of Thermal Expansion ASTM E831 D696 ISO 11359
		Linear Thermal Expansion is used to determine the rate at which a material expands as a function of temperature.
		The coefficient of linear thermal expansion is calculated between the desired temperature ranges.
	www.ptli.com /testlopedia/tests/COTE-E831.asp (287 words)

	Thermal Expansion of electroless nickel plating - Component Technologies, Inc. (Site not responding. Last check: )
		Thermal properties of electroless nickel vary with deposit composition.
		The coefficient of thermal expansion for high phosphorus coatings are approximate to that of steel.
		It should be noted at this point that the variation of C.T.E. between the electroless nickel deposit and the substrate has a profound effect on the extrinsic stress and should be considered when matching deposit to substrate.
	www.componenttechnologiesinc.com /coefficient_of_thermal_expansion_2.htm (93 words)

	Thermal expansion
		The parameter a is called the linear coefficient of thermal expansion; it is a material property that is indicative of the extent to which a material expands upon heating, and has units of reciprocal temperature [ (
		Examples: Mercury is liquid in the temperature range of -40° C to 357° C. Mercury expands as it gets warmer and its expansion rate is linear with the increase in temperature.
		The expansion coefficient of water (ice) are not at all typical!
	www.fisk.edu /~aburger/Published03_06/Introduction/Thermal/Thermal_expansion/thermal_expansion.html (217 words)

	t-clad insulated metal substrate thermal management materials/home
		The major concern with thermal expansion is the stress the solder joint experiences in power (or thermal) cycling.
		Thermal Clad is normally purchased in one of the standard constructions in the table below.
		When using electrical or thermal vias, it is important to match the circuit and base coefficients of thermal expansion as closely as possible.
	www.bergquistcompany.com /ts_base.cfm (357 words)

	DoITPoMS TLP - Thermal expansion and the bi-material strip - Thermal expansion
		The asymmetrical nature of the potential well means that this is accompanied by an increase in the average inter-atomic spacing for longitudinal vibrations.
		The Coefficient of Thermal Expansion (CTE), or thermal expansivity, α, is the relative change in linear dimensions, per unit of temperature change.
		Thermal expansivity values for some selected engineering materials, along with some other material data, are given in this properties table.
	www.doitpoms.ac.uk /tlplib/thermal-expansion/thermal-expansion.php (155 words)

	Laboratory Services: Materials Testing (Site not responding. Last check: )
		Touchstone is equipped with two dilatometers which measure the coefficient of thermal expansion within the thermal range of -150o C to +1500o C. Typical sample lengths are 2 to 4 inches and are less than.75 inches in diameter.
		The dilatometers are calibrated using materials, such as sapphire, quartz, or borosilicate glass, that are appropriate to the temperature range of interest.
		For example, Touchstone developed an apparatus to measure the thermal conductivity of jet engine insulating blankets using hot gas as the heat source impinging upon the blankets.
	www.trl.com /services/materialstesting/thermal.html (244 words)

	CPVC Duct Thermal Expansion & Contraction—Harvel Plastics, Inc. (Site not responding. Last check: )
		The coefficient of linear expansion (y) for Harvel CPVC Duct is 3.9 x 10-5 in/in/ªF, the lowest thermal expansion rate of commonly used thermoplastics.
		As with all piping products, thermal expansion and contraction of the system must be considered and properly addressed during the design and installation of the system.
		The effects of thermal expansion and contraction can also be compensated by using the inherent line flexibility of the system to construct expansion loops and offsets where required.
	www.harvel.com /duct-cpvc-expans.asp (235 words)

	Encyclopedia of Laser Physics and Technology - thermal lensing, laser gain medium, beam quality
		The cavity design should be made so that changes of the thermal lens do not affect too much the mode sizes in the laser cavity, and that aberrations of the thermal lens have only a small effect.
		A phenomenon related to thermal lensing is thermally induced depolarization loss.
		Ask RP Photonics for calculations of thermal lensing effects, or for designs of laser cavities with minimum sensitivity to thermal lensing.
	www.rp-photonics.com /thermal_lensing.html (658 words)

	EXPERIMENT 4: THERMAL COEFFICIENT OF EXPANSION
		The amount of expansion over the temperature range is critical to some applications.
		Your task is to determine the coefficient of thermal expansion of the material.
		Determine how to connect the two material specimens in the bridge circuit so the thermal effects on the strain gages are compensated for or cancelled.
	www.mines.edu /academic/courses/eng/EGGN383/exp4 (366 words)

	Coefficient of thermal expansion of liquids
		RE: Coefficient of thermal expansion of liquids (Blaine, Roger) 2.
		RE: Determination of Composition of Tin/Lead Solders by DS C (Blaine, Roger) --__--__-- Message: 1 From: "Blaine, Roger" To: "'thermal@egr.msu.edu'" Subject: RE: Coefficient of thermal expansion of liquids Date: Mon, 13 Aug 2001 08:00:06 -0400 Reply-To: thermal@egr.msu.edu Hi, Albert - There are no ASTM standards for volumetric expansion using thermomechanical analysis.
		August 2001 19:54 An: 'THERMAL@egr.msu.edu' Betreff: Coefficient of thermal expansion of liquids THERMAL NEWS GROUP: Dear THERMAL Subscribers: I have been asked by a customer to determine the coefficient of thermal expansion of a liquid monomer.
	www.egr.msu.edu /mailman-archives/thermal/2001-August/000575.html (684 words)

	On the Determination of Thermal Expansion Coefficient of Thermal Oxide
		The accurate value of thermal expansion coefficient (a) of thin film is an important thermal property in the design of microelectronic devices and microsystem.
		Moreover, in order to obtain the (a) value of thermal SiO2 film in accuracy, the nanoindentation system and the optical microscope with high resolution gauge were used to determine the elastic modulus of thermal SiO2 film and the (a) of silicon substrate, respectively.
		After experimental and FEM using thermal mechanical analysis approaches, the (a) value of thermal SiO2 film was calculated.
	www.nsti.org /BioNano2005/showabstract.html?absno=203 (248 words)

	High-Temperature Oxidation-Resistant and Low Coefficient of Thermal Expansion NiAl-Base Bond Coat Developed for a ...
		TBC life is frequently limited by the oxidation resistance of the bond coat, along with a thermal expansion mismatch between the metallic bond coat and the ceramic top coat.
		The aim of this investigation at the NASA Glenn Research Center was to develop a new longer life, higher temperature bond coat by improving both the oxidation resistance and the thermal expansion characteristics of the bond coat.
		The CTE measurements were made between room temperature and 1000 °C in an argon atmosphere.
	www.grc.nasa.gov /WWW/RT2002/5000/5120hebsur1.html (571 words)

	D6341-98(2005) Standard Test Method for Determination of the Linear Coefficient of Thermal Expansion of Plastic Lumber ...
		1.2 The thermal expansion of plastic lumber and shapes is composed of a reversible component on which may be superimposed changes in length due to changes in moisture content, curing, loss of plasticizer or solvents, release of stresses, phase changes, voids, inclusions, and other factors.
		This test method is intended to determine the coefficient of linear thermal expansion under the exclusion of non-linear factors as far as possible.
		For this reason, the test method can be expected to give a reasonable approximation but not necessarily precise determination of the linear coefficient of thermal expansion.
	www.astm.org /DATABASE.CART/REDLINE_PAGES/D6341.htm (442 words)

Try your search on: Qwika (all wikis)