scholarly journals Slip Casting of Alumina Powder Mixtures with Bimodal Size Distribution

1996 ◽  
Vol 104 (1209) ◽  
pp. 447-450 ◽  
Author(s):  
Seiichi TARUTA ◽  
Nobuo TAKUSAGAWA ◽  
Kiyoshi OKADA ◽  
Nozomu OTSUKA
Keyword(s):  
Size Distribution ◽  
Slip Casting ◽  
Alumina Powder ◽  
Bimodal Size Distribution ◽  
Powder Mixtures

Effects of Al2O3 Species and Particle Sizes on Properties of Al2O3-Cr2O3 Refractories

2013 ◽  
Vol 745-746 ◽  
pp. 610-615
Author(s):  
Hong Gang Sun ◽  
Peng Tao Li ◽  
Shuang Zhi Yan ◽  
Gang Wang ◽  
Jian Qiang Li ◽  
...  
Keyword(s):  
Pore Size ◽  
Bulk Density ◽  
Size Distribution ◽  
Modulus Of Rupture ◽  
Alumina Powder ◽  
Particle Sizes ◽  
Activated Alumina ◽  
Bimodal Size Distribution ◽  
Lower Porosity ◽  
Shock Resistance

The microstructure of Al2O3-Cr2O3 refractories is an important factor to affect its high temperature performance. The Al2O3-Cr2O3 green bodies were prepared by hot pressing using aluminum oxide and Cr2O3 powder mixture by adding a binder. And then the specimens were sintered at 1650 for 4h in the electric muffle furnace. Properties of specimens with different species of Al2O3 powders were studied, including α-Al2O3 powder, ρ-Al2O3 powder, and fused corundum powder. Moreover, three sizes of α-Al2O3 powder (D50=0.8 μm, 1.4 μm, 4.0 μm) were used as additive. Properties of specimens, including apparent porosity, bulk density, cold modulus of rupture, pore size distribution were tested. The morphology of sintered specimens was analyzed by the Scanning Electron Microscope. The results showed that the specimens adding α-Al2O3 powder had the better properties since α-Al2O3 powder has higher sintering activity, and it was more efficient for Al2O3-Cr2O3 solid solution. The specimens with α-Al2O3 had lower porosity, higher bulk density and cold modulus of rupture, and more uniform pore distribution. There were great differences in sintering activity for specimens with different particle size of α-Al2O3 powder. And the microstructure of Al2O3-Cr2O3 was significantly dissimilar. The specimen with the addition of the activated alumina powder of D50 with the size of 1.4 μm and bimodal size distribution showed the perfect performance, including high density and high flexural strength. The experimental results showed that the microstructure of this specimen was uniform and its pore size was homogeneous. This special microstructure is beneficial for improving the slag resistance and thermal shock resistance of Al2O3-Cr2O3 refractories.

Titanium compacts with controllable porosity by slip casting of binary powder mixtures

2014 ◽  
Vol 266 ◽  
pp. 396-406 ◽  
Author(s):  
Qian Xu ◽  
Brian Gabbitas ◽  
Steven Matthews
Keyword(s):  
Slip Casting ◽  
Powder Mixtures ◽  
Binary Powder Mixtures

Joining of Ceramic Components in the Green State via LPIM

2007 ◽  
Vol 29-30 ◽  
pp. 207-210 ◽  
Author(s):  
Rolf Waesche ◽  
Carl Paulick ◽  
Gabriele Steinborn ◽  
V. Richter ◽  
M. Werner
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Bending Strength ◽  
Ceramic Materials ◽  
Alumina Powder ◽  
Second Phase ◽  
Green State ◽  
Ceramic Components ◽  
Molded Parts

It has been successfully demonstrated that ceramic materials can be joined in the green state without a second phase by using low pressure injection molded parts. The investigation of the joining interface revealed that a high quality interface can be achieved by carefully adjusting the different manufacturing steps. The use of monomodal particle size distribution in the used powder CT3000SG is inferior to a broader particle size distribution obtained by replacing 33% of the finer alumina powder by coarser CT1200SG. In this way the dewaxing process is significantly improved when the wall thickness of the part exceeds 3 mm. The investigation of the mechanical properties of the joined and sintered parts revealed, that the bending strength of the joined specimens achieved about 80 % of the unjoined, monolithic specimens.

Regional and Transported A erosols in Ambient A tmosphere of Raipur,India, during W inter

2021 ◽  
Vol 30 (1) ◽  
pp. 7-17
Author(s):  
Manas Kanti Deb ◽  
Mithlesh Mahilang ◽  
Jayant Nirmalkar
Keyword(s):  
Size Distribution ◽  
Long Range ◽  
Fine Particles ◽  
Characteristic Size ◽  
Long Range Transport ◽  
Bimodal Size Distribution ◽  
Entire Study ◽  
Coarse Mode ◽  
Range Transport ◽  
Air Trajectory

Size fractionated atmospheric aerosols were collected using cascade impactor sampler on quartz flter substrate during October 2015 to February 2016 in campus of Pt Ravishankar Shukla University of Raipur Chhattisgarh. The size of aerosol particles is of crucial importance to several processes in the atmosphere. The relative concentrations in both modes are responsible for the variability observed in the shape of the size distribution. Characteristic size distributions of measured aerosol over central India showed identifcation of three main behaviour types during entire study period: (i) month in which bimodal size distribution dominated in coarse mode (October 2015, 5 December 2015 and January, 2016), (ii) those months in which bimodal distribution equally intense in both one, and coarse modes (November, 2015) and (iii) those which were mainly dominated within fine (February, 2016, December, 2015). The two-subsequent month namely November 2015 and December 2015 shows bimodal size distribution with dominance in fine size range in comparison to coarse mode, possibly these high loading of one particles is due to long range transport. The peculiar observation of air trajectory shows that there is increase in fine particles concentration during December 2015, although there in increase in temperature and wind speed. The reason for this high concentration is long range transport of air masses. However, January has normal trend in particular matter concentration. The important finding of the present study based on characteristic size distribution and air trajectory plots accomplishes that fine particles are obtained through long range transport whereas coarse particles are mainly from local origin.

scholarly journals Effect of Additives on Stability of Alumina—Waste Alumina Suspension for Slip Casting: Optimization Using Box-Behnken Design

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1738 ◽  
Author(s):  
Milan Vukšić ◽  
Irena Žmak ◽  
Lidija Ćurković ◽  
Danko Ćorić
Keyword(s):  
Ceramic Powder ◽  
Slip Casting ◽  
Growth Inhibitor ◽  
Poly Vinyl Alcohol ◽  
Alumina Powder ◽  
Suspension Stability ◽  
Concentrated Suspensions ◽  
Grain Growth Inhibitor ◽  
Ph Values ◽  
Weight Content

The green machining of alumina (Al2O3) green bodies generates a certain amount of waste alumina powder. Waste alumina ceramic powder should be disposed of as non-hazardous waste in a legally compliant manner. The influence of additives on the stability of 70 wt.% (≈40 vol.%) alumina—waste alumina water-based suspension was investigated in the presented research. A Box-Behnken three-factor response surface design was used for the preparation of stable highly-concentrated suspensions with the addition of three additives. The optimal amount of each additive was selected according to the obtained results of minimal apparent viscosity: 0.05 wt.% Tiron as dispersant, 0.1 wt.% poly (vinyl alcohol) as binder and 0.2 wt.% magnesium aluminate spinel as abnormal grain growth inhibitor. The analysis of variance was used to identify the contribution of each additive. The zeta potential and sedimentations tests were performed to confirm the suspension stability measurements at different pH values. Alumina particles were optimally dispersed at pH values between 8 and 11. According to the results, the investigated composition of 20 wt.% waste alumina powder (weight content, dry alumina powder), with the addition of optimal amounts of additives, shows a possible application in the production of ceramics by slip casting.

Dichroism in Ag nanoparticle composites with bimodal size distribution

2009 ◽  
Vol 105 (2) ◽  
pp. 024303 ◽  
Author(s):  
R. H. Magruder ◽  
S. J. Robinson ◽  
C. Smith ◽  
A. Meldrum ◽  
A. Halabica ◽  
...  
Keyword(s):  
Size Distribution ◽  
Ag Nanoparticle ◽  
Bimodal Size Distribution ◽  
Nanoparticle Composites

scholarly journals Near-field spectroscopy of bimodal size distribution of InAs∕AlGaAs single quantum dots

2005 ◽  
Vol 87 (14) ◽  
pp. 143108 ◽  
Author(s):  
Young-Jun Yu ◽  
In-Taek Jeong ◽  
Jong-Chun Woo ◽  
Wonho Jhe
Keyword(s):  
Quantum Dots ◽  
Size Distribution ◽  
Near Field ◽  
Single Quantum ◽  
Bimodal Size Distribution ◽  
Field Spectroscopy ◽  
Single Quantum Dots
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