Comparative Study on Compaction and Sintering Behavior of Spray and Freeze Granulated Magnesium Aluminate Spinel Powder

2021 ◽  
pp. 1-8
Author(s):  
Swathi Manivannan ◽  
Papiya Biswas ◽  
Prasenjit Barick ◽  
Sweety Kumari ◽  
Bhaskar Prasad Saha ◽  
...  
Keyword(s):  
Comparative Study ◽  
Magnesium Aluminate ◽  
Sintering Behavior ◽  
Magnesium Aluminate Spinel ◽  
Spinel Powder

scholarly journals THE EFFECT OF Mg-Al Wt% FOR PHASE FORMATION OF SPINEL MgAl2O4 PRODUCED BY METAL DISSOLVED METHOD

2020 ◽  
Vol 12 (1) ◽  
pp. 21
Author(s):  
Chairatul Umamah ◽  
Suminar Pratapa ◽  
Herman Jufri Andi
Keyword(s):  
Raw Materials ◽  
Relative Weight ◽  
Weight Fraction ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Qualitative And Quantitative ◽  
Mixing Method ◽  
Quantitative Analyses ◽  
Spinel Mgal2o4 ◽  
Spinel Powder

<p class="Abstract">Synthesis of magnesium aluminate spinel powder (MgAl<sub>2</sub>O<sub>4</sub>, abbreviated as MA) were prepared by the liquid mixing method. The synthesis of MA involved Mg powders with various weight compositions (4.8; 10; 20; 30; 40; and 60%) and Al powders (95.2; 90; 80; 70; 60 and 40%) as the raw materials, which were independently dissolved in 37% HCl to form MgCl<sub>2</sub> and AlCl<sub>3</sub> solutions. Both solutions were then mixed and stirred for 5 hours and dried to a temperature of about 100-105°C to produce powders with different weight compositions. Each powder resulted from drying was characterized using DTA-TGA, and then calcined at 650 °C; 750 °C and 850 °C for 1 hour. The calcined powder was characterized by XRD to qualitative and quantitative analyses using Rietica. It was found that MA samples contained only MgAl<sub>2</sub>O<sub>4</sub> and MgO as the impurity phase. The relative weight fraction of MgAl<sub>2</sub>O<sub>4</sub> increased up to 99% for 95.2 wt% Al. Using an extrapolative approach to determine the Mg-to-Al composition, nearly pure MA, as high as 99%, was achieved at 95.2% Al and 4.8% Mg.</p>

Gelcasting of Magnesium Aluminate Spinel Powder

2009 ◽  
Vol 92 (2) ◽  
pp. 350-357 ◽  
Author(s):  
Ibram Ganesh ◽  
Susana M. Olhero ◽  
Paula M. C. Torres ◽  
José M. F. Ferreira
Keyword(s):  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Spinel Powder

Effect of HIP on the Properties and Microstructure of Transparent Polycrystalline Spinel

2007 ◽  
Vol 336-338 ◽  
pp. 1200-1202 ◽  
Author(s):  
Mu Yun Lei ◽  
Cun Xin Huang ◽  
Jia Lin Sun
Keyword(s):  
Grain Size ◽  
Optical Properties ◽  
Hot Pressing ◽  
Hot Isostatic Pressing ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Sintering Aid ◽  
Average Transmittance ◽  
Before And After ◽  
Spinel Powder

In this paper, transparent polycrystalline magnesium aluminate spinel was fabricated by hot pressing ultra fine high purity spinel powder using LiF as the sintering aid in vacuum, then hot isostatic pressing (HIPing) the sintered body to improve the optical properties of the sample. The transmittance and the strength of the samples before and after HIPing were measured; morphologies of the fracture surface of the samples before and after HIPing were observed. Following hot pressing, the grain size of the sample is small; the transmission values are low and may varied at different sites in the same sample. After HIPing, the strength of the sample decreased, the grain size increased obviously, and the transmittance and the uniformity of transmittance increased significantly. The panel of transparent spinel up to 200 mm in diameter and 8 mm thick was fabricated by this method; the average transmittance of the spinel is above 80% in the range between 2 μm and 5 μm .

Sintering behavior of magnesium aluminate spinel MgAl 2 O 4 synthesized by different methods

2019 ◽  
Vol 16 (3) ◽  
pp. 1138-1149 ◽  
Author(s):  
Mohamed Mouyane ◽  
Basamat Jaber ◽  
Badis Bendjemil ◽  
Jérôme Bernard ◽  
David Houivet ◽  
...  
Keyword(s):  
Magnesium Aluminate ◽  
Sintering Behavior ◽  
Magnesium Aluminate Spinel
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