Effect of Binders on the Properties of Chromia/Alumina Refractory Castables

2012 ◽  
Vol 217-219 ◽  
pp. 1103-1105
Author(s):  
Jing Ming Zhao ◽  
Su Jeong Shin ◽  
Kyu Hong Hwang ◽  
Jong Kook Lee ◽  
Dong Sik Bae
Keyword(s):  
Bulk Density ◽  
Chromium Oxide ◽  
Mercury Porosimetry ◽  
Alumina Powder ◽  
Dihydrogen Phosphate ◽  
High Chromium ◽  
Solid Aluminum ◽  
Refractory Castables ◽  
Alumina Refractory ◽  
White Fused Alumina

Refractory castable specimens were prepared using industrial white fused alumina as aggregates, chromium oxide green and ultrafine alumina powder as matrix materials, solid aluminum dihydrogen phosphate (Al(H2PO4)3) or liquid AlPO4 as binder materials. Effect of different binder additions on the propertiSubscript textes of high chromium oxide IGCC refractory castables, such as bulk density, apparent porosity, strength was evaluated and their microstructures were observed by SEM and mercury porosimetry.

Effect of Micro-Sized Alumina Powder on the Hydration Process of Calcium Aluminate Cement

2018 ◽  
Vol 281 ◽  
pp. 249-254
Author(s):  
Zhong Feng Xia ◽  
Zhou Fu Wang ◽  
Xi Tang Wang ◽  
Hao Liu ◽  
Yan Ma
Keyword(s):  
Calcium Aluminate ◽  
Cement Hydration ◽  
Calcium Aluminate Cement ◽  
Hydration Heat ◽  
High Alumina ◽  
Alumina Powder ◽  
Hydration Products ◽  
Refractory Castables ◽  
Alumina Refractory ◽  
Aluminate Cement

Micro-sized alumina powder is widely used in low cement high-alumina refractory castables. The hydration of calcium aluminate cement can be affected by adding micro-sized alumina powder. This work addresses the hydration of a commercial cement at 25°C with 50 wt% micro-sized alumina powder added. The hydration heat was measured by isothermal micro-calorimetry. The phase composition and microstructure of the hydration products at the designated times were studied by XRD and SEM, respectively. The results showed that micro-sized alumina powder accelerated the dissolution of CAC. The induction period of the cement hydration reduced from 13h to 4.5h, and the hydration heat within 50hs was increased from 469J/g to 587J/g with the addition of micro-sized alumina powder. The morphology of the hydrates was flocculent amorphous at the beginning, and then transformed to short rods or cubic shape with micro-sized alumina powder added.

scholarly journals Binder effect on ZnAl2O4-containing high-alumina refractory castables

2022 ◽  
Author(s):  
V.S. Pinto ◽  
A.P. Luz ◽  
O.H. Borges ◽  
V.C. Pandolfelli
Keyword(s):  
High Alumina ◽  
Refractory Castables ◽  
Alumina Refractory

Self-reinforced high-alumina refractory castables

2018 ◽  
Vol 44 (2) ◽  
pp. 2364-2375 ◽  
Author(s):  
A.P. Luz ◽  
A.H.G. Gabriel ◽  
L.B. Consoni ◽  
C.G. Aneziris ◽  
V.C. Pandolfelli
Keyword(s):  
High Alumina ◽  
Refractory Castables ◽  
Alumina Refractory

Effect of MgO/CuO on the Microstructure and Thermal Properties of Cordierite–Alumina Ceramics

2012 ◽  
Vol 509 ◽  
pp. 240-244
Author(s):  
Li Ying Tang ◽  
Xi Cheng ◽  
Ping Lu ◽  
Fang Yue
Keyword(s):  
Thermal Conductivity ◽  
Bulk Density ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Raw Materials ◽  
Laser Flash ◽  
Alumina Powder ◽  
Alumina Ceramics ◽  
Conductivity Increase ◽  
Shock Resistance

Abstract: Cordierite–alumina ceramics were prepared with the raw materials of cordierite and α-alumina powder, and TiO2，CuO and MgO were added as composite additives. The effect of MgO/ CuO ratios on the microstructure, thermal conductivity and thermal shock resistance of cordierite–alumina ceramics were researched by X-ray diffraction, scanning electron microscopy and laser flash analyzer; the bulk density and the porosity of cordierite – alumina ceramics were measured. The results show that with increasing of MgO/CuO ratios, the bulk density and thermal conductivity increase firstly and then decrease, and have a minimum with 0.4wt% MgO and 0.667 MgO/CuO; and the porosity of ceramics decreases firstly and then increases and has a maximum with 0.4wt% MgO and 0.667 MgO/CuO;There are little changes in the size of the grain of the ceramics, and a small amount of magnesium aluminate spinel precipitate; the thermal shock resistance performance of the ceramics is developed with the increasing of MgO/CuO ratios.

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