Application of Reclaimed Ladle Bricks in Magnesium Aluminate Spinel Based Castables

2013 ◽  
Vol 395-396 ◽  
pp. 544-547
Author(s):  
Zhi Hui Li ◽  
Dian Li Qu ◽  
Jing Li ◽  
Lin Wang
Keyword(s):  
Thermal Shock ◽  
Erosion Resistance ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Comprehensive Properties ◽  
High Bulk Density ◽  
Shock Resistance ◽  
High Bulk ◽  
Diagram Analysis ◽  
Slag Erosion

The way of producing ladle used MgO-Al2O3 castables using reclaimed bricks of ladle as aggregate is researched by structure analysis, XRD and phase diagram analysis. Influence on structure and physical properties of castables added different percentage of reclaimed bricks is discussed. The following conclusions are got: Adding suitable reclaimed ladle bricks won’t decrease the strength of the specimens, all the specimens have high bulk density(≥2.98g/cm3) and low apparent porosity(≤14%); Suitable addition of reclaimed ladle bricks as aggregate can improve the thermal shock resistance of MgO-Al2O3 castables, however, over-addition will weaken its thermal shock resitance; Slag erosion resistance increases with the addition of reclaimed ladle bricks. To sum up, reclaimed ladle bricks can be used in MgO-Al2O3 castables and castables with excellent comprehensive properties can be got when 12.5% reclaimed ladle bricks are added as aggregate.

Performance Studies on In Situ Spinel Solid Solution Bonded Periclase Refractories

2014 ◽  
Vol 633 ◽  
pp. 245-248
Author(s):  
Xin Lin ◽  
Yong Li ◽  
Yan Jing Li ◽  
Jun Jie Zhang ◽  
Chang He Gao ◽  
...  
Keyword(s):  
Solid Solution ◽  
Phase Composition ◽  
Performance Studies ◽  
Magnesium Aluminate ◽  
Spinel Solid Solution ◽  
Magnesium Aluminate Spinel ◽  
Crushing Strength ◽  
Cold Crushing Strength ◽  
Shock Resistance

Specimens were prepared using iron-rich magnesia (3~1 mm、≤1 mm) and high purity magnesia (≤0.088 mm) as the main starting materials, adding tabular alumina at different size (3~2、2~1、≤1 mm) and content:3%、6%、9%、12%、15% to discover the influence of tabular alumina on sample performance. Phase composition and microstructure were also analyzed. The results show that specimen with content of 6% of corundum possessed the best comprehensive performance:apparent porosity 17%, bulk density 2.95 g·cm-3, cold crushing strength 74 MPa, refractoriness under load 1700 °C, heat shock resistance of up to 18 times. The formations of magnesium aluminate spinel and hercynite solid solution were enhanced by Fe ion at high temperatures in the iron-rich magnesia-corundum system at the presence of iron oxides, which are able to largely dissolved in periclase.

Effect of Heat Treatment Temperature on Properties of SiO2-ZrO2-Al2O3-Cr2O3 Coatings on Stainless Steel Substrate

2012 ◽  
Vol 538-541 ◽  
pp. 359-362
Author(s):  
Qing Mei Jia ◽  
Yong Hong Tang ◽  
Ke Nan Meng
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Thermal Shock ◽  
Abrasion Resistance ◽  
Thermal Shock Resistance ◽  
Ceramic Coating ◽  
Erosion Resistance ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Shock Resistance

The SiO2-ZrO2-Al2O3-Cr2O3 film is coated on the surface of stainless steel using analytical reagent TEOS, ZrOCl2·8H2O, Al(NO3)3·9H2O and Cr(NO3)3·9H2O as precursor and basing on mole ratio to calculate through Sol-gel method. The phase transformation behavior，erosion resistance，thermal shock resistance and abrasion resistance of ceramic coating by different heat treatment are studied. The results show that: 1)The SiO2-ZrO2-Al2O3-Cr2O3 gel coatings has non-crystalline structure after the treatment at 700°C and 800°C. New substance is not created below 700°C 2) The stainless steel substrate with ceramic coating has a higher erosion resistance at high temperature (700°Cand 800°C)than that without coating.3) Thermal shock resistance of the samples treated in 700°C is the best which has reached within 17-21cycles (900°C, air cooling). 4) The stainless steel substrate with ceramic coating has a higher abrasion resistance than that without coating. The samples treated at 700°Cand 800°C have the best abrasion resistance.

Development and Application of Shotcreting Castable for Steel Ladle

2011 ◽  
Vol 396-398 ◽  
pp. 848-853
Author(s):  
Yan Qin ◽  
Guo Tao Liu ◽  
Ze Ming Tong ◽  
Yong Chen
Keyword(s):  
Service Life ◽  
Physical Properties ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Erosion Resistance ◽  
Raw Material ◽  
Steel Ladle ◽  
Shock Resistance ◽  
Good Workability ◽  
Aluminate Cement

The article mainly introduct the development and application of shotcreting castable for metallurgical steel ladle. The shotcreting castable mainly use tabular alumina, white fused corundum, fused spinel, aluminate cement, alumina micro powder, fused magnesium as raw material, After studied by the workability and physical properties of gunning machine, it is proved by application in steel ladle, the shotcreting castable has a good workability, with higher adhesive rate, faster hardening speed, better thermal shock resistance and stronger erosion resistance ability. So the shotcreting castable has a higher service life.

scholarly journals The effect of Y2O3 addition on thermal shock behavior of magnesium aluminate spinel

2009 ◽  
Vol 41 (1) ◽  
pp. 75-81 ◽  
Author(s):  
Milica Posarac ◽  
A. Devecerski ◽  
T. Volkov-Husovic ◽  
B. Matovic ◽  
D.M. Minic
Keyword(s):  
Thermal Shock ◽  
Young Modulus ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Ultrasonic Determination ◽  
Spinel Mgal2o4 ◽  
Thermal Shock Behavior ◽  
Y2o3 Addition ◽  
New Phase

The effect of yttria additive on the thermal shock behavior of magnesium aluminate spinel has been investigated. As a starting material we used spinel (MgAl2O4) obtained by the modified glycine nitrate procedure (MGNP). Sintered products were characterized in terms of phase analysis, densities, thermal shock, monitoring the damaged surface area in the refractory specimen during thermal shock and ultrasonic determination of the Dynamic Young modulus of elasticity. It was found that a new phase between yttria and alumina is formed, which improved thermal shock properties of the spinel refractories. Also densification of samples is enhanced by yttria addition.

Effect of Heat Treatment Temperature on Properties of SiO2-ZrO2-Al2O3-Cr2O3 Coatings on Stainless Steel Substrate

2010 ◽  
Vol 177 ◽  
pp. 321-324
Author(s):  
Shu Xian Liu ◽  
Qian Ping Wang ◽  
Yi Miao Nie
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Thermal Shock ◽  
Abrasion Resistance ◽  
Thermal Shock Resistance ◽  
Ceramic Coating ◽  
Erosion Resistance ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Shock Resistance

The SiO2-ZrO2-Al2O3-Cr2O3 film is coated on the surface of stainless steel using analytical reagent TEOS, ZrOCl2•8H2O, Al(NO3)3•9H2O and Cr(NO3)3•9H2O as precursor and basing on mole ratio to calculate through Sol-gel method. The phase transformation behavior, erosion resistance, thermal shock resistance and abrasion resistance of ceramic coating by different heat treatment are studied. The results show that: 1) The SiO2-ZrO2-Al2O3-Cr2O3 gel coatings has non-crystalline structure after the treatment at 700°C and 800°C. New substance is not created below 700°C. 2) The stainless steel substrate with ceramic coating has a higher erosion resistance at high temperature (700°C and 800°C)than that without coating.3) Thermal shock resistance of the samples treated in 700°C is the best which has reached within 17-21cycles (900°C, air cooling). 4) The stainless steel substrate with ceramic coating has a higher abrasion resistance than that without coating. The samples treated at 700°C and 800°C have the best abrasion resistance.

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