Synthesis and characterization of nano-alumina powder by milling of Al and MnO2 powder mixture

2021 ◽  
Author(s):  
K.S. Ravikumar ◽  
S. Ghanaraja ◽  
M.R. Ramesh
Keyword(s):  
Powder Mixture ◽  
Synthesis And Characterization ◽  
Alumina Powder ◽  
Nano Alumina

Synthesis and Characterization of Ti3(Al1-n Gen)C2 by a Reactive Hot Pressing of TiCx, Al, and Ge Powder Mixture

2007 ◽  
Vol 124-126 ◽  
pp. 751-754 ◽  
Author(s):  
Jae Ho Han ◽  
Kyung Don Nam ◽  
Sang Whan Park ◽  
Young Do Kim
Keyword(s):  
Flexural Strength ◽  
Powder Mixture ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Indentation Load ◽  
Synthesis And Characterization ◽  
Solid Reaction ◽  
Ternary Carbide ◽  
Reactive Hot Pressing

Bulk Ti3(Al1-nGen)C2 (n=0, 0.3, 0.5, 0.7, 1.0)were synthesized by a reactive hot pressing of TiCX (x=0.6), Al and Ge powder mixture at 1400 °C for 1 h under 25 MPa. A series of Ti3(Al1-nGen)C2 was successfully synthesised by a hot pressing through a direct liquid-solid reaction between Al-Ge melt and TiCx, and simultaneous densification. Synthesized bulk Ti3(Al1-nGen)C2 was maintained a typical layered structure as shown in other ternary carbide such as Ti3AlC2 and Ti3GeC2. With increasing Al or Ge contents in Ti3(Al1-nGen)C2, both of Vickers hardness and flexural strength of Ti3(Al1-nGen)C2 were increased compared to those of pure Ti3AlC2 and Ti3GeC2 . The maximum flexural strength of Ti3(Al1-nGen)C2 (n=0.3) was about 600 MPa, which was about 3 times higher than that of pure Ti3GeC2. The Vickers hardnesses of Ti3(Al1-nGen)C2 and Ti3AlC2 were slightly decreased with increasing an indentation load.

scholarly journals Preparation and characterization of electroless Ni coated nano alumina powder under different sensitization - activation conditions

10.30544/467 ◽  
2020 ◽  
Author(s):  
Sameer Kumar Devarakonda ◽  
Naga Sai Suman K ◽  
Kalyana Krishna Y
Keyword(s):  
Alumina Powder ◽  
Metallic Ions ◽  
Nano Alumina ◽  
Characterization Studies ◽  
Electroless Coatings ◽  
Activation Conditions ◽  
Average Size ◽  
Electroless Ni

The development of electroless coatings on various substrates has gained much interest among researchers for the sake of improved properties. However, the coating on ceramic particles as a source of reinforcement is still a challenge for the researchers and requires a good comprehension of fundamentals since the coating thickness relies upon many parameters. Particularly the sensitization and activation conditions are more important for the creation of an ideal environment to draw metallic ions as a coating layer. Therefore, this paper examines the role of sensitization and activation conditions on the viability of nickel coating on the alumina particles of an average size of 50 nm. A comparison is made between two environments, namely individual and blended activations in the preparation of coated particles. Characterization studies are also presented to support the discussion. 

Characterization of microwave-sintered ceramic composites

1993 ◽  
Vol 51 ◽  
pp. 1136-1137
Author(s):  
X. Zhang ◽  
Y. Pan ◽  
T.T. Meek
Keyword(s):  
Matrix Material ◽  
Maximum Output Power ◽  
Ceramic Matrix Composite ◽  
Ceramic Composites ◽  
Processing Technique ◽  
Structure Characterization ◽  
Alumina Powder ◽  
Maximum Output ◽  
Sintered Ceramic

Industrial microwave heating technology has emerged as a new ceramic processing technique. The unique advantages of fast sintering, high density, and improved materials properties makes it superior in certain respects to other processing methods. This work presents the structure characterization of a microwave sintered ceramic matrix composite.Commercial α-alumina powder A-16 (Alcoa) is chosen as the matrix material, β-silicon carbide whiskers (Third Millennium Technologies, Inc.) are used as the reinforcing element. The green samples consisted of 90 vol% Al2O3 powder and 10 vol% ultrasonically-dispersed SiC whiskers. The powder mixture is blended together, and then uniaxially pressed into a cylindrical pellet under a pressure of 230 MPa, which yields a 52% green density. The sintering experiments are carried out using an industry microwave system (Gober, Model S6F) which generates microwave radiation at 2.45 GHz with a maximum output power of 6 kW. The composites are sintered at two different temperatures (1550°C and 1650°C) with various isothermal processing time intervals ranging from 10 to 20 min.

Synthesis and Characterization of the Three Dicyclopentapyrenes

1996 ◽  
Vol 61 (10) ◽  
pp. 3572-3572
Author(s):  
Lawrence T. Scott ◽  
Atena Necula
Keyword(s):  
Synthesis And Characterization
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