scholarly journals Magnesia-zircon brick: Evolution of microstructure, properties and performance with increasing sintering temperature

2013 ◽  
Vol 45 (2) ◽  
pp. 181-188
Author(s):  
J. Gao ◽  
Z. Guo ◽  
L. Wang ◽  
W. Jiang
Keyword(s):  
Bulk Density ◽  
Microstructural Evolution ◽  
Creep Resistance ◽  
Sintering Temperature ◽  
Modulus Of Rupture ◽  
Crushing Strength ◽  
Cold Crushing Strength ◽  
And Performance ◽  
Evolution Of Microstructure ◽  
Font Color

Depending on phase components and densification, Magnesia-Zircon brick varies in appearance from white to veined and then brown with increasing sintering temperature. Properties including bulk density, apparent porosity and hot modulus of rupture as well as performance embodied with creep resistance and refractoriness continue to improve with sustaining enhancement of sintering temperature. Exceptionally, cold crushing strength first increases then decreases with rising sintering temperature and a peak exists at 1550oC. Microstructural evolution suffers zircon decomposition companying by silica escape, forsterite formation, matrix solidification and zirconia coagulation, until a zirconia/forsterite composites belt tightly coating on magnesia aggregates. Excessive coagulation of zirconia caused by oversintering probably results in microcracks formation and defects enlargement thereby degrades cold crushing strength.<br><br><font color="red"><b> This article has been retracted. Link to the retraction <u><a href="http://dx.doi.org/10.2298/SOS1303387E">10.2298/SOS1303387E</a><u></b></font>

Research on the Sinterability of MgAl2O3/SiC Composites in Air Atmosphere

2011 ◽  
Vol 399-401 ◽  
pp. 834-837
Author(s):  
Chun Hui Cao ◽  
Jun Cong Wei ◽  
Jian Kun Huang ◽  
Jun Bo Tu
Keyword(s):  
Physical Properties ◽  
Bulk Density ◽  
Room Temperature ◽  
Sintering Temperature ◽  
Apparent Porosity ◽  
National Standards ◽  
Crushing Strength ◽  
Air Atmosphere ◽  
Cold Crushing Strength ◽  
Sic Composites

MgAl2O4-SiC composites were prepared by using MgAl2O4 and SiC powder as main starting materials, being pressed to cylindrical specimens of Φ30mm×30mm at 200 MPa and heated respectively at 1400°C and 1500°C for 3 hours in air atmosphere. The room temperature physical properties of sintered samples were tested according to related national standards. The phase compositions were analyzed by XRD. The microstructure of the fracture of the samples was observed by SEM. The results showed that MgAl2O4-SiC materials could sintered well in air atmosphere. The mechanism is that SiC was oxidized to form active SiO2, which reacted with MgAl2O4 to produce liquid cordierite promoting the sintering of the materials. The sinterability of MgAl2O4-SiC materials was overall improved with increasing the sintering temperature. When the content of SiC of MgAl2O4-SiC materials was 10%, the cold crushing strength and bulk density of the samples reached maximums and apparent porosity reached a minimum; the content of SiC was more than 10%, the sinterability of samples deteriorated.

Preparation and Properties of High-Purity Porous Calcium Hexaluminate Material

2016 ◽  
Vol 697 ◽  
pp. 547-550 ◽  
Author(s):  
Meng Fei Wu ◽  
Yuan Bing Li ◽  
Shu Jing Li ◽  
Ya Wei Li ◽  
Shao Bai Sang
Keyword(s):  
Thermal Conductivity ◽  
Calcium Carbonate ◽  
Bulk Density ◽  
High Purity ◽  
Sintering Temperature ◽  
Raw Materials ◽  
True Density ◽  
Crushing Strength ◽  
Calcium Hexaluminate ◽  
Cold Crushing Strength

In this paper, high-purity porous calcium hexaluminate materials were prepared with α-alumina, nano-meter calcium carbonate and ρ-alumina as raw materials. The properties of the prepared porous materials, such as bulk density, true density, thermal conductivity, and cold crushing strength, were investigated. The increase in sintering temperature led to the increase of true density. Bulk density and cold crushing strength of the specimen fired at 1500°C had the lowest values. As ρ-alumina content increased, bulk density, true density, and cold crushing strength had no obvious changes, but the thermal conductivity decreased at first and then increased. The calcium hexaluminate formation was intense from 1450°C to 1500°C and finished at 1500°C. Above 1500°C, the main phase of specimens was calcium hexaluminate (CA6). And CA6 grains were regular hexagonal plates morphology and widely spread after firing at 1550°C.

scholarly journals Retracted: Magnesia-zircon brick: Evolution of microstructure, properties and performance with increasing sintering temperature

2013 ◽  
Vol 45 (3) ◽  
pp. 387-387
Author(s):  
U Urednistvo
Keyword(s):  
Intellectual Property ◽  
Research And Development ◽  
Sintering Temperature ◽  
Technology Center ◽  
Retracted Article ◽  
And Performance ◽  
Evolution Of Microstructure ◽  
Font Color

(retraction) This article has been retracted: please see Science of Sintering Policy on Article Withdrawal (http://www.iiss.sanu.ac.rs/forauthors.htm, see Withdrawal policy). This article has been retracted at the request of Mr. Bernd Buchberger, Head of Corporate Research and Development of the RHI AG Technology Center and Mr. Alfons Luftenegger, Head of Innovation and Intellectual Property Menagement of the RHI AG Technology Center, due to legal limitations, since the publication of this article was not authorized by RHI AG or any company within the RHI Group. <br><br><font color="red"><b> Link to the retracted article <u><a href="http://dx.doi.org/10.2298/SOS1302181G">10.2298/SOS1302181G</a></b></u>

scholarly journals EVALUATION AND CHARACTERIZATION OF GAKEM AND ABOUCHICHE CLAY SAMPLES IN BEKWARRA LGA OF CROSS RIVER STATE FOR USE AS REFRACTORY MATERIALS

2017 ◽  
Vol 36 (3) ◽  
pp. 844-848
Author(s):  
FA Ovat ◽  
DE Ewa ◽  
EA Egbe
Keyword(s):  
Bulk Density ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Linear Shrinkage ◽  
Apparent Porosity ◽  
Refractory Materials ◽  
Crushing Strength ◽  
Cold Crushing Strength ◽  
Shock Resistance

The characterization of some clay as refractory materials for furnace lining has become relevant to find solutions to the cost involved in the purchase and importation of these refractory materials. This work investigated the refractory properties of clay samples for their suitability for use in the industries. Clay samples were collected from Gakem and Abouchiche areas and analysed for physical and chemical properties to determine the suitability of the clays as refractory materials. The results showed cold crushing strength (21.46MN/m2), thermal shock resistance (27 cycles), bulk density (3.52g/cm3), linear shrinkage(3.80%), apparent porosity (28.84%) and permeability (80%) for Gakem; and cold cold crushing strength (18.40MN/m2), thermal shock resistance (25 cycles), bulk density(2.81g/cm3), linear shrinkage (3.70%), apparent porosity (25.86%) and permeability (77%) for Abouchiche respectively. The chemical compositions of these clay samples were also investigated. The results showed that the samples fall under Aluminosilicate type of clay because of their high values of Aluminium Oxide and Silicon Oxide. Tests showed that clay from these areas can be used to produce refractory materials that can withstand a furnace temperature of about 1600°C. http://dx.doi.org/10.4314/njt.v36i3.26

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