Preparation of SiCp/Al composite–bismuthate glass material and its application in mirror blanks

RSC Advances ◽  
2015 ◽  
Vol 5 (64) ◽  
pp. 52167-52173 ◽  
Author(s):  
Shengguan Qu ◽  
Huashan Lou ◽  
Xiaoqiang Li ◽  
Tairong Kuang
Keyword(s):  
Melting Point ◽  
The Novel ◽  
Glass Material ◽  
Al Composite ◽  
Composite Glass

A low melting point bismuthate glass was developed for bonding SiCp/Al composite, and the novel SiCp/Al composite–glass material was prepared.

scholarly journals Eine metastabile Form des dimeren 1,2-Dioxyphenylen-siliciumdichlorids / A Metastable Form of the 1,2-Dioxyphenylene-silicon-dichloride Dimer

1990 ◽  
Vol 45 (7) ◽  
pp. 957-960
Author(s):  
Urszula Dettlaff-Weglikowska ◽  
Wolfgang Hönle ◽  
Dagobert Thiery ◽  
Hans Georg von Schnering
Keyword(s):  
Melting Point ◽  
Spatial Arrangement ◽  
The Novel ◽  
Space Group ◽  
Bond Angles ◽  
Metastable Form

Dimeric 1,2-Dioxyphenylene-dichloride (1) crystallizes dimorphically. The already known monoclinic m-form (space group P21/α) is the thermodynamically stable modification and can be obtained by sublimation. The novel triclinic α-form (space group P1̄) is a metastable modification and can be obtained from CH2Cl2 solution. The α-form crystallizes with a = 591.7(5) pm; b = 1457.0(8) pm; c = 991.7(6) pm; α = 96.68(3)°; β = 106.29(3)°; γ = 91.48(3)° and Z = 4 formula units (2 dimers). The molecules of the a- and the m-form are identical with respect to bond distances, bond angles and their conformations, but they are different in their spatial arrangement. The melting point of the α-form is 126.5 °C, of the m-form 140.0 °C. The melt of 1 solidifies as a glass from which the α-form recrystallizes.

scholarly journals Synthesis of spirooxindoles with three component reaction between β-ketoesters, malononitrile and isatin derivatives in the presence of Alum.SiO2 nanoparticles as a new nano catalyst

2015 ◽  
Vol 37 ◽  
pp. 80 ◽  
Author(s):  
Marziyeh Rohi ◽  
Bahareh Sadeghi ◽  
Mohamadhosaine Moslemin
Keyword(s):  
Melting Point ◽  
Simple Procedure ◽  
The Novel ◽  
Synthetic Route ◽  
Multicomponent Synthesis ◽  
Short Reaction Time ◽  
Nano Catalyst ◽  
Three Component Reaction ◽  
Work Up ◽  
Isatin Derivatives

In this reseaech, some of the spirooxindole derivaties were prepared via β-ketoesters, malonoitrile and isatin derivatives in the presenceAlum.SiO2 NPs as an effective, recyclable and inexpensive catalyst. The products were identified by IR, 1HNMR, 13C NMR spectr a, andmelting point. The size of nanoparticles characterized by SEM and TEM techniques. A novel multicomponent synthesis of a series ofspirooxindol derivatives is described. The procedures was carried out applying Alum/SiO2 supported on NPS as the novel cataly st givingrise to high to excellent yielded synthetic route of spirooxindol compounds. The major advantages of this protocol are short reaction time,good yields , simple procedure work up as well as friendly synthesis. In this work, some of the spirooxindole derivaties wer e prepared via β-ketoesters, malononitrile and isatin derivatives in the presence Alum.SiO2 NPs as an effective, recyclable and inexpensive catalyst. Theproducts were identified by IR,1HNMR,13CNMR spectra, and melting point. The size of nanoparticles characterized by SEM and TEMtechniques.(scheme 1)

Effect of the Content of LaNd on Physical Properties and Solderability of Zn20Sn6Cu Solder

2011 ◽  
Vol 686 ◽  
pp. 515-520
Author(s):  
Kuai Le Zhao ◽  
Yan Fu Yan ◽  
Yong Bing Li
Keyword(s):  
Melting Point ◽  
Physical Properties ◽  
Low Cost ◽  
Lead Free Solder ◽  
The Novel ◽  
Temperature Range ◽  
Maximum Value ◽  
The Matrix ◽  
Free Solder ◽  
Solid Temperature

Zn20Sn6Cu solder with the melting point of 382°C has good mechanical properties and low cost. Therefore it is considered as an ideal high-temperature lead-free solder. However, its physical properties and spreading properties are poor. In this paper a new solder was made by adding trace LaNd into Zn20Sn6Cu alloy to improve the performance. The effect of the content of LaNd on physical properties and weld ability of Zn20Sn6Cu solder was investigated. The experimental results showed that the effect of the content of LaNd on the melting point of Zn20Sn6Cu solder was not obvious and the liquid-solid temperature range of the Zn20Sn6Cu solder increased with the increasing of the content of LaNd (less than 0.5 wt.%). When RE content was 0.1 wt.%, the liquid-solid temperature range of Zn20Sn6Cu0.1RE was only 13.3°C. The resistivity of the novel solders increased with the increasing of the content of LaNd. When LaNd is higher than 0.3 wt%, the resistivity of the novel solder sharply increased. The spreading performance of the new solder alloy was improved obviously by adding trace LaNd into Zn20Sn6Cu solder. When the content of LaNd was 0.1 wt%, the spreading area of Zn20Sn6Cu0.1LaNd solder reached to the maximum value of 32.5% bigger than that of the matrix solder, which mainly related to the formation of the new CuZn5 and Cu5Zn8 phases as well as the intermetallic compounds between the solder and the substrate. Therefore, considering the physical properties and spreading properties of the novel solders, the best content of LaNd is about 0.1 wt.%.

Experimentally constrained atomic order probing of a Si–Al composite glass

2013 ◽  
Vol 94 (8) ◽  
pp. 792-800 ◽  
Author(s):  
K. Karalis ◽  
L. Temleitner ◽  
G.S.E. Antipas ◽  
L. Pusztai ◽  
A. Xenidis
Keyword(s):  
Atomic Order ◽  
Al Composite ◽  
Composite Glass

Time Dependent Leaching in Two-Phase Composite Glasses

1983 ◽  
Vol 26 ◽  
Author(s):  
C. J. Montrose ◽  
Aaron Barkatt ◽  
P. B. Macedo
Keyword(s):  
Steady State ◽  
Continuous Phase ◽  
Time Dependent ◽  
High Dilution ◽  
Two Phase ◽  
Glass Material ◽  
Composite Glass ◽  
Final Steady State

ABSTRACTA model has been developed for the elemental leach rates as a function of time in the high-dilution limit for a two-phase composite glass material in which one phase exists as unconnected inclusions embedded within a major continuous phase. For those elements that are preferentially concentrated in this minor and presumed less durable phase, the leach rates are strongly time-dependent, decreasing significantly from the initial to the final steady-state value.

Synthesis Study of the Antioxidant of Tetrakis(2,4-di-tert-butyl phenyl)-4,4’-Biphenylenediphosphonite Esters

2012 ◽  
Vol 581-582 ◽  
pp. 206-209
Author(s):  
Yan Li ◽  
Jian Zhao ◽  
Qing Yu ◽  
Zhong Wei Wang
Keyword(s):  
Thermal Stability ◽  
Melting Point ◽  
Raw Materials ◽  
Commercial Product ◽  
The Novel ◽  
Target Compound ◽  
Tert Butyl

The antioxidant of tetrakis(2,4-di-tert-butylphenyl)-4,4’-biphenylenediphosphonate (TBBPP) was synthesized using biphenyl, PCl3, AlCl3, and 2,4-di-tert-butylphenol as raw materials. Phosphite esters were selected as the novel decomplex agent to isolate the intermediate of 4,4’-biphenylbisphosphorus dichloride complex from the complex it formed with AlCl3 during the reaction. The separate factors such as the mole ratio of the decomplex agent used, the decomplex temperature, and effect of decomplex agent were studied. The specifications of melting point, thermal stability and transmittance of the target compound synthesized were compared with the commercial product, and the results showed that the TBBPP synthesized in the study showed fairly better quality than the commercial one.

Voids in Irradiated Tungsten and Molybdenum

1969 ◽  
Vol 27 ◽  
pp. 190-191
Author(s):  
Robert C. Rau ◽  
Robert L. Ladd
Keyword(s):  
Melting Point ◽  
Fast Neutron ◽  
Neutron Irradiation ◽  
Elevated Temperatures ◽  
Irradiation Temperature ◽  
The Body ◽  
Face Centered Cubic ◽  
Body Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Recent studies have shown the presence of voids in several face-centered cubic metals after neutron irradiation at elevated temperatures. These voids were found when the irradiation temperature was above 0.3 Tm where Tm is the absolute melting point, and were ascribed to the agglomeration of lattice vacancies resulting from fast neutron generated displacement cascades. The present paper reports the existence of similar voids in the body-centered cubic metals tungsten and molybdenum.

The observation of nano-voids in Au thin films

1987 ◽  
Vol 45 ◽  
pp. 366-367
Author(s):  
William Krakow
Keyword(s):  
Thin Films ◽  
Melting Point ◽  
Present Author ◽  
Stacking Faults ◽  
Damage Threshold ◽  
Ionic Species ◽  
Rare Gases ◽  
Chain Defects ◽  
Vacancy Chains ◽  
Au Thin Films

It has long been known that defects such as stacking faults and voids can be quenched from various alloyed metals heated to near their melting point. Today it is common practice to irradiate samples with various ionic species of rare gases which also form voids containing solidified phases of the same atomic species, e.g. ref. 3. Equivalently, electron irradiation has been used to produce damage events, e.g. ref. 4. Generally all of the above mentioned studies have relied on diffraction contrast to observe the defects produced down to a dimension of perhaps 10 to 20Å. Also all these studies have used ions or electrons which exceeded the damage threshold for knockon events. In the case of higher resolution studies the present author has identified vacancy and interstitial type chain defects in ion irradiated Si and was able to identify both di-interstitial and di-vacancy chains running through the foil.

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