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Showing 1 to 20 of 429 for “"thermal expansion"”.
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Thermal expansion of chemically modified mullite
… solid solutions in an effort to lower their thermal expansion coefficients. TiO₂, B₂O₃, CrPO₄, P2O₅, Ga₂O₃, Cr2O₃, and WO₃ and the half-breed SiO₂ compounds AlPas, BPO₄, GaPO₄, BAsO₄, AIAsO₄, GaAsO₄, and GeO₂ were chosen as the modifiers. The results indicate that, apart from TiO₂, none of …
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Low-temperature thermal expansion of amorphous solids
… and temperature dependences of specific heat, thermal conductivity and ultrasonic dispersion are qualitatively similar, independent of chemical composition. It has been suggested that thermal expansion also exhibits this universal behavior. The development of a dilatometer cap- 12 able of …
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Thermal expansion and magnetostriction studies on iron pnictides
… was set up and used for measurements of the thermal expansion and magnetostriction of novel superconducting iron pinictides and related materials. In particular, \re~with R\,=\,La, Ce, Pr, Sm, Gd, \laf~and Ca(Fe$_{1-x}$Co$_x$)$_2$As$_2$ have been investigated. The data on polycrystalline …
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High thermal expansion phosphorus oxide and oxynitride glasses
… of (a) identifying phosphate glasses whose thermal expansion and chemical durability make them suitable for sealing to high expansion metals like aluminum alloys and stainless steels, (b) learning more about how the dissolution of nitrogen in a glass can be affected by the processing …
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Plasma spraying low thermal expansion alumino-silicate glasses
… compositions.</p><p>Crystallization behavior and thermal expansion of near-stoichiometric cordierite glasses and glass-ceramics doped with TiO<sub>2</sub> were investigated. The activation energy for growth of surface nucleated crystals was shown to be 433kJ/mol. and was related to titanium cation …
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Lattice parameter and thermal expansion in solid methane
… position and width was verified by independent thermal arrest measurements. The average entropy discontinuity was 0.65 cal/mole/deg. A phenomenological study of the data in the range 2.5 to 12 K was made to gain some understanding of the observed negative thermal expansion below 9.75 K. The …
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Thermal expansion behavior of Mo-Si-B system intermetallics
… However, Mo5Si3 single crystal has significant thermal expansion anisotropy along the a and c directions with α[Subscript C]/α[Subscript a]=2.2. Calculation by C. L. Fu et al. shows that this can result in substantially high residual thermal stresses, up to 1.8 Gpa, due to thermal expansion …
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Epoxy coating systems: Probing negative thermal expansion with zinc cyanide
The purpose of this document is two-fold. First, as a formal written submission of the work completed for my degree, but secondly, as a useful reference for myself as I continue to work in the line of composite materials and any others who venture into this area. As such, Chapter 1 gives the …
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Thermal Expansion, Internal Stress, and Strength of Glass-Crystal Composites
Made available in DSpace on 2014-12-10T17:32:38Z (GMT). No. of bitstreams: 1 6915410.pdf: 3084944 bytes, checksum: b7bc29b46702c51d414feb4a93759bc3 (MD5) Previous issue date: 1969
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Synthesis and characterization of ultralow thermal expansion NZP- type compounds
New ultra-low thermal expansion materials, based on the NZP structure, have been developed and evaluated for future application in ceramic diesel engines which require exceptional thermal shock resistance. Twenty-four cation substitutions, with electron valence ranging from +1 to +5, were used to …
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Negative Thermal Expansion in Zincblende Structure: an EXAFS study of CdTe
… In this work an accurate evaluation of the bond thermal expansion, parallel and perpendicular MSRDs and distribution asymmetry of the first shell of CdTe has been made, obtaining a good agreement between two different procedures of the data analysis (i) ratio method (ii) FEFF6-FEFFIT method. The …
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Measurements of Thermal Expansion and Thermal Equilibrium Defects in Puresilver-Chloride
Made available in DSpace on 2015-05-12T21:41:27Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6406057.PDF: 2300991 bytes, checksum: 8cab353bd7427ad0e6a0b757365e5e30 (MD5) Previous issue date: 1963
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The Thermal Expansion of Ammonium-Chloride Near The Order-Disorder Transition
Made available in DSpace on 2015-05-12T21:41:54Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7013317.PDF: 1632496 bytes, checksum: 1156d0c31f173690e869ea8ee4121a9c (MD5) Previous issue date: 1969
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The thermal expansion of ammonium chloride near the order-disorder transition
… possibility of the first order transition. The thermal expansion at constant pressure of ammonium chloride was measured in order to test the predictions of the theory. A three terminal bridge measurement of an electrical capacitance determined by the length of single crystals of ammonium …
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Weld development for Incoloy alloy 908, a low thermal expansion superalloy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1995.
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A finite element mesh optimization procedure using a thermal expansion analogy
… optimum meshes are synthesized by the use of thermal expansion principles in conjunction with an analogous temperature field computed from the element strain energy contents. Elements having high strain energy contents are shrunk and those with low strain energy contents are expanded until all …
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Elastic constants and thermal expansion of niobium as a function of temperature
… A few measurements were also carried out on the thermal expansion of niobium, from 140°-280°K, and this quantity determined at a function of the temperature. The average expansion coefficient over the whole range studied was 6.24x10 to the -6th deg -1, which agreed moderately well with earlier …
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Thermal expansion and phase transformation behavior in the rare-earth titanate system
In this work, the thermal expansion behavior in the Ln2TiO5 system was explored, and mechanisms behind such behavior were described. The components of the thermal expansion tensor were calculated from the refined d-spacings using the program CTEAS for the cubic, orthorhombic, and hexagonal phases. …
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