scholarly journals Impurity effects in thermal regelation

Soft Matter ◽  
2020 ◽  
Vol 16 (25) ◽  
pp. 5886-5891 ◽  
Author(s):  
Navaneeth K. Marath ◽  
J. S. Wettlaufer
Keyword(s):  
Liquid Film ◽  
Melting Temperature ◽  
Intermolecular Forces ◽  
Impurity Effects ◽  
Lower Melting ◽  
Lower Melting Temperature

When a particle is placed in a material with a lower bulk melting temperature, intermolecular forces can lead to the existence of a “premelted” liquid film of the lower melting temperature material.

Melt-derived bioactive glass based on SiO2-CaO-Na2O-P2O5 system fabricated at lower melting temperature

2018 ◽  
Vol 732 ◽  
pp. 603-612 ◽  
Author(s):  
Nurul Farhana Ibrahim ◽  
Hasmaliza Mohamad ◽  
Siti Noor Fazliah Mohd Noor ◽  
Nurazreena Ahmad
Keyword(s):  
Bioactive Glass ◽  
Melting Temperature ◽  
Lower Melting ◽  
P2o5 System ◽  
Lower Melting Temperature

CERROLOW-147 Alloy

Alloy Digest ◽  
1981 ◽  
Vol 30 (1) ◽  
Keyword(s):  
Low Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Melting Temperature ◽  
Eutectic Alloy ◽  
Heat Treating ◽  
Freezing Range ◽  
Lower Melting ◽  
Metal Products ◽  
Lower Melting Temperature

Abstract CERROLOW-147 Alloy is a bismuth-base non-eutectic alloy that melts over the narrow, low-temperature range of 142-149 F (61-65 C). It has a slightly lower melting temperature than CERROBEND Alloy (Alloy Digest Bi-6, August 1978) and functions about as well for the same uses if its small freezing range is not objectionable. Cerrolow-147 Alloy provides engineers and technicians with an easily castable material that is ready for use as soon as it freezes. It is highly suitable in industry for such uses as anchoring parts for machining and support for bending tubing and extrusions. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on casting, forming, heat treating, and machining. Filing Code: Bi-21. Producer or source: Cerro Metal Products.

Thermal decomposition of sodium amide, NaNH2, and sodium amide hydroxide composites, NaNH2–NaOH

2016 ◽  
Vol 18 (36) ◽  
pp. 25257-25264 ◽  
Author(s):  
Lars H. Jepsen ◽  
Peikun Wang ◽  
Guotao Wu ◽  
Zhitao Xiong ◽  
Flemming Besenbacher ◽  
...  
Keyword(s):  
Solid Solution ◽  
Thermal Decomposition ◽  
Melting Temperature ◽  
Lower Melting ◽  
Lower Melting Temperature ◽  
Sodium Amide

Composites of NaNH2 and the omnipresent NaOH have a lower melting temperature and form a non-stoichiometric solid solution, Na(OH)1−x(NH2)x, during heating.

scholarly journals On the Effect of Recycled Polyolefins on the Thermorheological Performance of Polymer-Modified Bitumen Used for Roofing-Applications

2021 ◽  
Vol 13 (6) ◽  
pp. 3284
Author(s):  
Martin Wieser ◽  
Andreas Schaur ◽  
Seraphin Hubert Unterberger ◽  
Roman Lackner
Keyword(s):  
Melting Temperature ◽  
Phase Angle ◽  
Homogeneous Distribution ◽  
Modified Bitumen ◽  
Scanning Calorimetry ◽  
High Crystallinity ◽  
Lower Melting ◽  
Technical Specifications ◽  
Polymer Modified Bitumen ◽  
Lower Melting Temperature

In order to meet the technical specifications in roofing applications, the bitumen used for this purpose is standardly modified by polymers. This, in general, allows the re-use of recycled polymer during the production of polymer-modified bitumen (PmB), simultaneously reducing the amount of polymeric waste. Recycling processes, however, may degrade or contaminate polymers, leading to reduced crystallinity and lower melting temperature. Six different recycled polyolefins (high crystallinity: iPP, HDPE; reduced crystallinity: APP, PP Copolymer; waxy polyolefins: Wax 105, Wax 115) were assessed on their suitability for roofing applications. Mixing characteristics, polymer distribution and thermo-mechanical properties of the PmB samples were determined, employing fluorescence microscopy, modulated temperature differential scanning calorimetry (MTDSC) and dynamic shear rheometry (DSR). Depending on mixing properties, two levels of polymer content (5 and 16 wt% or 16 and 30 wt%) were considered. High crystallinity polymers exhibited the biggest increase in |G*| and lowest phase angle. Reduced crystallinity polymers were more easily dispersed and showed improved |G*| and phase angle. Waxy polyolefins improved bitumen similarly to reduced crystallinity polymers and are easily dispersed. The results suggest, that a reduced crystallinity or lower melting temperature of the recycled polymers resulting from degradation or contamination may be beneficial, resulting in improved mixing behavior and a more homogeneous distribution of the polymer within the bitumen.

Thermo-mechanical and wetting behavior of modified SnAg3.5eutectic solder alloy

2015 ◽  
Vol 7 (3) ◽  
pp. 1939-1951 ◽  
Author(s):  
Abu Bakr El-Bediwi
Keyword(s):  
Contact Angle ◽  
Elastic Modulus ◽  
Melting Temperature ◽  
Solder Alloy ◽  
Eutectic Alloy ◽  
Crystal Size ◽  
Matrix Structure ◽  
Wetting Behavior ◽  
Bismuth Content ◽  
Lower Melting Temperature

Effects of adding bismuth content on structure, thermo-mechanical and wetting behavior of SnAg3.5 eutectic alloy have been investigated. Matrix structure of SnAg3.5 eutectic alloy, such as crystallinity, crystal size and lattice parameters, changed after adding bismuth content which effect on all measured properties. Melting temperature of SnAg3.5 eutectic alloy decreased after adding bismuth content. Elastic modulus and contact angle of SnAg3.5 eutectic alloy varied after adding bismuth content. The Sn66.5Ag3.5Bi30alloy has the best solder properties for electronic applications such as lower melting temperature, contact angle and elastic modulus.

Composite Rods for Brazing

2014 ◽  
Vol 1029 ◽  
pp. 72-77 ◽  
Author(s):  
Emilia Binchiciu ◽  
Traian Fleșer ◽  
Ionelia Voiculescu
Keyword(s):  
Melting Point ◽  
Buffer Layer ◽  
Melting Temperature ◽  
Base Metal ◽  
Cost Reduction ◽  
Silver Content ◽  
The Core ◽  
Coating Mixture ◽  
High Silver ◽  
Lower Melting Temperature

The paper presents research conducted for the development of precursors and wrapped rods for brazing, that deposit, through melting, two different alloys, with respect to the level of silver alloying and the melting temperature. The alloy with the high silver content is introduced under the form of powder, in the coating of the brazing rods, in a participation proportion that assures a buffer layer, with advance proprieties of diffusion in the base metal and in the core alloy of the coated rod. The participation ratio of the silver rich powder alloy is established within the following limits 8-12%, depending on their melting point, the grinding degree and mixing with the deoxidizer coat. The development of the precursors was made by homogeneous melting and spraying on a oblique plan, the grains obtained were grounded, the grist obtained is considered optimum to be introduced in the coating mixture after it successfully passed through a sieve with a mesh of 0.1 mm. The alloyed precursors with 45% silver, grounded between the above mentioned limits, were introduced in the deoxidizer coat mixture af the bare rods type Ag30 according to SR EN 1044/1999. The resulted mixture was used to manufacture experimental lots of covered rods for brazing, which were used for testing, in order to achieve highly important joints. The melting temperature of the precursors was established through micro-alloying so that it will be 10-15°C higher than that of the deoxidizer coat, which in turn has a lower melting temperature, by 56-60°C, than the melting temperature of the core alloy. The deoxidizer coat is usually fluoroboric type, conforming to SR EN 1045/2001. Representative joints made with the new experimental rods, after testing, presented results consistent with the requirements, which allowed the authors to appreciate this method as appropriate for cost reduction with brazing materials in the use of composite coated rods.

Crystallization behaviors of ZnxSb100−x thin films for ultralong data retention phase change memory applications

CrystEngComm ◽  
2014 ◽  
Vol 16 (5) ◽  
pp. 757-762 ◽  
Author(s):  
Yimin Chen ◽  
Guoxiang Wang ◽  
Xiang Shen ◽  
Tiefeng Xu ◽  
R. P. Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
Activation Energy ◽  
Phase Change ◽  
Melting Temperature ◽  
Crystallization Temperature ◽  
Phase Change Memory ◽  
Data Retention ◽  
Memory Applications ◽  
Change Memory ◽  
Lower Melting Temperature

ZnSb films have higher crystallization temperature (~257 °C), larger crystalline activation energy (~5.63 eV), better 10 year-data-retention (~201 °C) and lower melting temperature (~500 °C).

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