Effect of binder and particle size on the nature of the exothermic reaction for NiCr-Al composite powder

1992 ◽  
Vol 31 (12) ◽  
pp. 1043-1047
Author(s):  
A. L. Borisova ◽  
L. K. Doroshenko ◽  
I. V. Mits ◽  
G. M. Grigorenko
Keyword(s):  
Particle Size ◽  
Composite Powder ◽  
Exothermic Reaction ◽  
Al Composite

Hydrogen Generation by Hydrolysis of the Ball Milled Al-C-KCl Composite Powder in Distilled Water

2012 ◽  
Vol 519 ◽  
pp. 87-91 ◽  
Author(s):  
Xia Ni Huang ◽  
Zhang Han Wu ◽  
Ke Cao ◽  
Wen Zeng ◽  
Chun Ju Lv ◽  
...  
Keyword(s):  
Particle Size ◽  
Reaction Temperature ◽  
Fine Particle ◽  
Composite Powder ◽  
Hydrogen Generation ◽  
Aluminum Particle ◽  
Generation Rate ◽  
Composite Powders ◽  
Fine Particle Size ◽  
Hydrolysis Of

In the present investigation, the Al-C-KCl composite powders were prepared by a ball milling processing in an attempt to improve the hydrogen evolution capacity of aluminum in water. The results showed that the hydrogen generation reaction is affected by KCl amount, preparation processing, initial aluminum particle size and reaction temperature. Increasing KCl amount led to an increased hydrogen generation volume. The use of aluminum powder with a fine particle size could promote the aluminum hydrolysis reaction and get an increased hydrogen generation rate. The reaction temperature played an important role in hydrogen generation rate and the maximum hydrogen generation rate of 44.8 cm3 min-1g-1of Al was obtained at 75oC. The XRD results identified that the hydrolysis byproducts are bayerite (Al(OH)3) and boehmite (AlOOH).

Shear-induced particle size segregation in composite powder transfer films

2014 ◽  
Vol 264 ◽  
pp. 133-139 ◽  
Author(s):  
Patrick S.M. Dougherty ◽  
Martin C. Marinack ◽  
Cecily M. Sunday ◽  
C. Fred Higgs
Keyword(s):  
Particle Size ◽  
Composite Powder ◽  
Size Segregation ◽  
Transfer Films

Self-propagating high-temperature synthesis of the SiC

1986 ◽  
Vol 1 (2) ◽  
pp. 275-279 ◽  
Author(s):  
Osamu Yamada ◽  
Yoshinari Miyamoto ◽  
Mitsue Koizumi
Keyword(s):  
Particle Size ◽  
High Temperature ◽  
Exothermic Reaction ◽  
Experimental System ◽  
Ignition Process ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Effect Of Particle Size ◽  
Constituent Elements ◽  
Heat Released

Self-propagating high-temperature synthesis (SHS), also called combustion synthesis, is useful for fabricating numerous ceramics. In the case of SiC, heat released from the exothermic reaction is not sufficient to completely convert the mixed reactants of constituent elements into SiC in the usual nonadiabatic experimental system. This disadvantage could be overcome by a new ignition process called, the “direct passing method of electric current.” By using this method, stoichiometric fine SiC powder could be obtained rapidly and efficiently with low electric power. This paper also involves the effect of particle size of Si and C initial reactant powders on conversion efficiency into SiC and also on particle size of SiC powder fabricated by this method.

Electrochemical Performance of Barium Strontium Cobalt Ferrite -Samarium Doped Ceria- Argentum for Low Temperature Solid Oxide Fuel Cell

2020 ◽  
Vol 991 ◽  
pp. 94-100
Author(s):  
Umira Asyikin Yusop ◽  
Tan Kang Huai ◽  
Hamimah Abdul Rahman ◽  
Nurul Akidah Baharuddin ◽  
Jarot Raharjo
Keyword(s):  
Particle Size ◽  
Low Temperature ◽  
Composite Powder ◽  
Cobalt Ferrite ◽  
High Energy ◽  
Solid Oxide ◽  
Electrochemical Characteristics ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Barium Strontium

A low operating temperature is one of the concerns in commercialising solid oxide fuel cells (SOFCs) as a portable power source. The aim of this research is to develop a new cathode material, barium strontium cobalt ferrite–samarium doped ceria (BSCF-SDC) added with argentum (Ag) for low-temperature SOFCs (LT-SOFCs). The composite powder was prepared through high-energy ball milling at 550 rpm for 2 h with a BSCF:SDC powder ratio of 50:50. The composite powder was calcined at 950 °C for 2 h and then mixed with Ag (1wt%, 3wt% and 5wt%) via dry milling at 150 rpm. The phase stability of the resulting samples was examined by X-ray diffractometry, and powder particle sizes were determined by using a Zeta-Sizer Nano ZS. The thermal stability of each sample was determined on the basis of thermal expansion coefficients (TECs), and electrochemical characteristics were determined through electrochemical impedance spectroscopy to investigate the performance of BSCF-SDC-Ag in LT-SOFCs (400–600 °C). Phase analysis demonstrated no impurity phases existed. Particle size analysis revealed that increment in Ag content affect the particle size of BSCF-SDCC. TEC analysis demonstrated that BSCF-SDC-Ag1% has a mismatch value of 16.39%, which is within the acceptable TEC range of 15%–20%. BSCF-SDC-Ag1% showed a maximum conductivity of 39.37Scm-1 at 600 °C.

Fabrication of Zirconia Coatings using Electrophoretic Deposition and Reactive Sintering

2002 ◽  
Vol 750 ◽  
Author(s):  
Ying Yuan ◽  
Xin Wang ◽  
Ping Xiao
Keyword(s):  
Particle Size ◽  
Thermal Treatment ◽  
Electrophoretic Deposition ◽  
Powder Mixture ◽  
Milling Time ◽  
Composite Coatings ◽  
Thermal Analyses ◽  
Reactive Sintering ◽  
Attrition Milling ◽  
Al Composite

ABSTRACTElectrophoretic deposition (EPD) technique has been used to fabricate green YSZ/Al composite coatings with controlled thickness and morphology. Such green coating was transformed into the YSZ/Al2O3 composite coating during following thermal treatment in air at temperatures up to 1200°C. Suspension for EPD was prepared by attrition-milling a mixture of yttria -stabilised zirconia (YSZ) and aluminium (Al) in acetyl-acetone (ACAC). The attrition milling reduced the particle size of the powder mixture. A mechanical alloying behaviour is believed to control the agglomeration and the breaking of large Al particles. Attrition milling also reduced the YSZ crystallite size, which can be attributed to the chemical reaction between YSZ/Al particles and ACAC. Thermal analyses and dilatometry measurements of the green compact indicate the temperature range for oxidation of Al and its effect on sintering of the coating. The coating obtained from EPD in the suspension after a longer milling time was found to have more uniform in microstructure.

Study on the structure and properties of core–shell Fe/Al composite powder synthesized by MOCVD in fluidized bed

2014 ◽  
Vol 25 (2) ◽  
pp. 676-681 ◽  
Author(s):  
Zhenye Wang ◽  
Mulin Hu ◽  
Zhian Chen ◽  
Zhengxin Lu ◽  
Changsheng Xie
Keyword(s):  
Fluidized Bed ◽  
Composite Powder ◽  
Core Shell ◽  
Structure And Properties ◽  
Al Composite

B4C/5083 Al Composite Prepared by Cryomilling

2011 ◽  
Vol 233-235 ◽  
pp. 1825-1829
Author(s):  
Bin Hao ◽  
Ji Shan Zhang ◽  
Da Cheng Liu
Keyword(s):  
Composite Powder ◽  
Milling Time ◽  
Hot Extrusion ◽  
Coarse Grained ◽  
Coarse Grain ◽  
X Ray Diffraction ◽  
X Ray ◽  
Blended Powder ◽  
Al Composite ◽  
B4c Particles

In the present investigation, the composite powder with 20wt.% particulate B4C and 80wt.% nanocrystalline 5083 Al was fabricated using mechanically milling at cryogenic temperature (cryomilling). After this, the cryomilled composite powder was homogeneously blended with an equal amount of unmilled coarse-grained 5083 Al. The blended powder was consolidated with hot-pressing at 500°C, followed by hot extrusion at 410°C. The consolidated composite consists of 10wt.% B4C, 50wt.% coarse grain 5083 Al and the balance nanocrystalline 5083 Al. The microstructure evolution of the composite during cryomilling and consolidation was investigated by X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM). The results show that the particle size of the cryomilled composite powder became smaller and then bigger with milling time longer. This demonstrates the course rely mainly on broken first, and then rely mainly on cold welding with milling time longer. B4C particles can be distributed in 5083 Al matrix uniformly. In addition, the presence of oxygen and nitrogen in cryomilled powders has been demonstrated in this paper.

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