A lower-melting-point solder alloy for surface mounts

JOM ◽  
1996 ◽  
Vol 48 (5) ◽  
pp. 54-56 ◽  
Author(s):  
M. T. McCormack ◽  
Y. Degani ◽  
H. S. Chen ◽  
W. R. Gesick
Keyword(s):  
Melting Point ◽  
Solder Alloy ◽  
Lower Melting ◽  
Lower Melting Point ◽  
Surface Mounts

scholarly journals Beiträge zur Chemie des Phosphors, 68 Tri-t-butyl-cyclotriphosphan.

1976 ◽  
Vol 31 (10) ◽  
pp. 1305-1310 ◽  
Author(s):  
Marianne Baudler ◽  
Josef Hahn ◽  
Hermann Dietsch ◽  
Gabriele Fürstenberg
Keyword(s):  
Reaction Time ◽  
Melting Point ◽  
Ir Spectra ◽  
Pure State ◽  
Molar Mass ◽  
Fractional Distillation ◽  
Ring Plane ◽  
Lower Melting ◽  
Lower Melting Point

In the reaction of magnesium with trimethylchlorosilane and t-butyldichlorophosphane the hitherto unknown tri-t-butyl-cyclotriphosphane, (t-BuP)3 (1), is produced besides the partially silylated phosphanes t-BuP(SiMe3)2 and (t-BuPSiMe3)2 as well as the cyclotetraphosphane (t-BuP)4. Shortly after the beginning of the reaction the amount of 1 is about 50 mole-% and decreases during the reaction time. Thermally and in solution the P3 ring compound (1) is surprisingly stable and can be isolated in a pure state by fractional distillation. (t-BuP)3 clearly differs from the oligomeric (t-BuP)4 by the lower melting point, the molar mass and by the 31P NMR and IR spectra. The t-butyl groups in 1 are situated above and below the P3 ring plane.

scholarly journals Chlorosulphonation of 2,4-dimethylacetanilide

1972 ◽  
Vol 25 (1) ◽  
pp. 221 ◽  
Author(s):  
WLF Armarego
Keyword(s):  
Melting Point ◽  
Authentic Sample ◽  
Rigorous Proof ◽  
Lower Melting ◽  
Lower Melting Point ◽  
Made In

The reaction of chlorosulphonic acid with 2,4-dimethylacetanilide was described in two patents the orientation of the sulphonyl group in the sulphonyl chloride formed (m.p.147�) was not stated. This reaction was later repeated and was said to yield 5-acetamido-2,4-dimethylbenzenesulphonyl chloride which had a lower melting point (133-134�). Because no rigorous proof of the constitution of the product was given by these authors, the reaction was reexamined and is reported here. The acetamidodimethylbenzenesulphonyl chloride obtained in this work had m.p. 146.5-147�. It reacted with ammonia to give 5-acetamido-2,4-dimethylbenzene-sulphonamide which was hydrolysed to 5-amino-2.4-dimethylbenzenesulphonamide. The constitution of these products was established by diazotizing the latter compound and converting it into 5-iodo-2,4-dimethylbenzenesulphonamide. The melting point of the iodo compound (188-188.5�) differed from the melting point (176�) described in the literature for this compound which was prepared by sulphonation of 1-iodo-2,4-dimethylbenzene followed by conversion into the sulphonyl chloride and then into the amide. 5-Iodo-2,4-dimethylbenzenesulphonamide was reduced with zinc and ammonia to 2,4-dimethylbenzenesulphonamide whose melting point was similar to the value in the 1iterature it did not depress the melting point of an authentic sample made in two steps from sodium 2,4-dimethylbenzenesulphonate, and its p.m.r. spectrum was consistent with its structure, i.e. H5 and H6 gave a quartet with a coupling of 9 Hz characteristic of ortho benzene protons.

Phase and Morphological Transformation of Preformed AZ91D Magnesium Alloys in Remelting

2005 ◽  
Vol 475-479 ◽  
pp. 473-476
Author(s):  
Ming-Xu Xia ◽  
Hong-xing Zheng ◽  
Sen Yuan ◽  
Jian Guo Li
Keyword(s):  
Melting Point ◽  
Magnesium Alloys ◽  
Semisolid State ◽  
Melting Points ◽  
Morphological Transformation ◽  
Lower Melting ◽  
Partial Remelting ◽  
Final Microstructure ◽  
Lower Melting Point ◽  
Two Stages

The phase and morphological transformation during the remelting process was investigated by isothermal soaking and rapidly quenching of preformed AZ91D magnesium alloys in semisolid state. It was revealed that the morphological transformation of preformed alloys is crucial to obtain homogenously fine spheroidal grains and affect the final forming ability. The transformation is divided into two stages, local remelting of the whole experiment and partial remelting of the respective grains, which behave as liquid bands and liquid cells structures, respectively. In the partial melting, the lower melting point phase, β-Mg17Al12, diffused to the grains boundary and center of the grains and separated to Al2Mg and Mg. The Al2Mg and Mg phases with lower melting points melt into cells structures. The final microstructure of the remelting experiments is composed of cells structures, spheroidal grains and liquid phase.

A Vertical Type Tandem Twin Roll Caster for Clad Strip Equipped with a Scraper

2014 ◽  
Vol 611-612 ◽  
pp. 623-628 ◽  
Author(s):  
Toshio Haga ◽  
Hiroshi Tsuge ◽  
Takuya Ishihara ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Melting Point ◽  
Lower Melting ◽  
Lower Melting Point ◽  
Twin Roll Caster ◽  
Twin Roll

A vertical type tandem twin roll caster equipped with a scraper for the clad strip was invented. This roll caster could cast three layers clad strip which base strip had lower melting point than that of the overlay strips. The base strip was cast by an upper twin roll caster and the overlay strips were cast by a lower twin roll caster. The scrapers were attached to the lower twin roll caster, and were innovated to cast this type of three layers of clad strip. Solidification layers those became the overlay strips were pulled from between the scraper and the roll. The melt of the alloy which was as same as the base strip was poured between the scraper and the base strip. This melt connect the overlay strip and the base strip. The base strip was not re-melted. The scraper enabled that the solidification layer of the overlay strip contact to the melt of the base strip without mixing of the melt of the base and overlay strip. In this way, the sound three layers clad strip which base strip had lower melting point than that of the overlay strip could be cast by the vertical type tandem twin roll caster equipped with a scraper.

scholarly journals Bi2(C2O4)3·7H2O and Bi(C2O4)OH Oxalates Thermal Decomposition Revisited. Formation of Nanoparticles with a Lower Melting Point than Bulk Bismuth

2017 ◽  
Vol 56 (16) ◽  
pp. 9486-9496 ◽  
Author(s):  
Pierre Roumanille ◽  
Valérie Baco-Carles ◽  
Corine Bonningue ◽  
Michel Gougeon ◽  
Benjamin Duployer ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Melting Point ◽  
Lower Melting ◽  
Lower Melting Point

Enhanced thermoelectric properties in Pb-doped BiCuSeO oxyselenides prepared by ultrafast synthesis

RSC Advances ◽  
2015 ◽  
Vol 5 (85) ◽  
pp. 69878-69885 ◽  
Author(s):  
Guang-Kun Ren ◽  
Jin-le Lan ◽  
Sajid Butt ◽  
Kyle J. Ventura ◽  
Yuan-Hua Lin ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Melting Point ◽  
Thermoelectric Properties ◽  
Ignition Temperature ◽  
Lower Melting ◽  
Lower Melting Point

SHS process reduces period from over 10 h to less than 1 min, and thermal analysis indicates the ignition temperature of BiCuSeO approaches the second lower melting point of the compound. ZT = 0.91 at 873 K for Bi0.96Pb0.04CuSeO was achieved.

Viscosity Determination of High Oxidizability Refining Slag and Its Buildup Solution

2010 ◽  
Vol 146-147 ◽  
pp. 1198-1201
Author(s):  
Xiao Ping Liang ◽  
Yang Jin ◽  
Yu Wang
Keyword(s):  
Melting Point ◽  
Refining Process ◽  
Refining Slag ◽  
Ladle Slag ◽  
High Crystallinity ◽  
Lower Melting ◽  
Lower Melting Point ◽  
The Relationship ◽  
Viscosity Determination

The principal purpose of this paper are to determine the viscosity of refining slag with the features of high crystallinity and strongly oxidizability, and to solve the problem that slag sticked onto the RH immersion tube during the RH refining process. Then, the fluid length method was used to determine the viscosity, and the effect of compositions on melting point and viscosity of refining ladle slag was studied. Overall, the relationship between viscosity and fluid length was acquired, and it achieved the slag with lower melting point and good fluidity which can avoid slag building-up on RH immersion tube by adjusting the basicity of refining slag to 4-5, the content of Al2O3 to 14-15% with additives.

scholarly journals BIODEGRADATION OF POLYBLEND POLYPROPILENE- PALM OIL-AMYLUM BY Bacillus subtilus AND Clostridium botulinum

2010 ◽  
Vol 3 (3) ◽  
pp. 160-165
Author(s):  
Zainal Fanani ◽  
Miksusanti Miksusanti ◽  
Desnelli Desnelli
Keyword(s):  
Tensile Strength ◽  
Melting Point ◽  
Palm Oil ◽  
Clostridium Botulinum ◽  
Lower Melting ◽  
Before And After ◽  
Lower Melting Point ◽  
Bacillus Subtilus ◽  
Function Group

It had been done a biodegradation polyblend from blending polypropilene-palm oil-amylum with three composition of polyblend i.e polyblend A 80% polypropilene- 19.5% palm oil- 0.5% amylum, poliblend B 80% polypropilene- 19% palm oil- 1% amylum and polyblend C 80% polypropilene-18% palm oil- 2% amylum by B. subtilus and C. botulinum, time incubation was twenty five days. The characterization of polyblend before and after biodegradation has done with FTIR, DTA, Viscometre and tensile strength of polyblend. The result showed that Bacillus subtilus and Clostridium botulinum can biodegradate polyblend and make holes as well as chink on polyblend especially polyblend C, because it has more carbohidrat than polyblend A and B. Analysis from FTIR showed compatible of poliblend because it did not have a new function group and did not change of wavelength. Data of tensile strength showed lower value after biodegradation at polyblend C and from DTA and Viscometre showed lower melting point and lower average molecule weight, respectively.   Keywords: Biodegradation, Polyblend, Bacillus, Clostridium

A Roll Caster to Cast Clad Strip

2013 ◽  
Vol 554-557 ◽  
pp. 1902-1909 ◽  
Author(s):  
Toshio Haga ◽  
Hiroshi Tsuge ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Melting Point ◽  
Hot Rolling ◽  
Direct Chill ◽  
Al Alloys ◽  
Mg Alloy ◽  
Lower Melting ◽  
Lower Melting Point ◽  
Dc Casting ◽  
Twin Roll Caster ◽  
Twin Roll

A tandem-type roll caster that can cast a three-layered clad strip was developed by mounting one twin roll caster on another twin roll caster. In this caster, the base strip is cast by the upper twin roll caster, and the overlay strips are cast by the lower caster. The three strips are metallurgically bonded by the lower caster. This study investigated three aspects of this caster. First, the clad ratio could be controlled by the solidification lengths of strips from the upper and lower twin roll casters, and a clad ratio of 1:8:1 was attained. Second, although it is known that fabrication of clad strips from Al-Mg alloy and other Al alloys is very difficult, the clad strip with the Al-Mg alloy as the base strip or the overlay strip could be cast. Finally, by adding scrapers, the caster could cast the clad strip with a base strip having a lower melting point than the overlay strip. Element strips of the clad strip are made by many processes, such as direct chill (DC) casting, scraping of the ingot surface, heat treatment, hot rolling, and cold rolling. Typically, surface treatment and hot rolling are used to clad the strips. Since many processes are required, clad strips require consume much energy. Therefore, producing clad strips is expensive. A vertical-type tandem twin roll caster was developed to cast clad strips. This caster has the advantages of process saving and energy saving, and so can fabricate economical clad strips. In the fabrication of clad strips, control of the clad ratio is very important. In the brazing sheet for automobile radiators, the base strip is made from AA3003 and the overlay strips are made from AA4045, and the clad ratio is usually 1:8:1. In the present study, a clad strip with a clad ratio of 1:8:1 was attained. The cladding by hot rolling of Al-Mg and other aluminum alloys, which is considered to be a very difficult process, was also investigated. Clad strips with either a base strip or an overlay strip of an Al-Mg alloy were cast by the roll caster. Although the cladding was not easy, the Al-Mg alloy could be cast into the clad strip. In addition, a clad strip with a base strip having a lower melting point than that of the overlay strip was investigated. Such cladding cannot be cast by the vertical-type tandem twin roll caster as mentioned above because the base strip is re-melted from the heat of the overlay strips. In the present study, a scraper was developed and adopted to cast a clad strip with a base having a lower melting point than that of the overlay strips. This type of clad strip could be cast because the scrapers prevented the re-melting of the base strip. In this paper, these three aspects of fabrication are reported.

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