effect of magnesia on strength of hydratable aluminaalumina magnesia refractory castable

Nanotechnology in castable refractoryScienceDirect

 · Silicon carbide (SiC) is popular among researcher as a refractory material because SiC can be stable above 2700 °C and it has high strength ( 800–1000 MPa) and fracture toughness (6–10 MPa m 1/2).It can also be used in aggressive environments due to the formation of a protective coating of SiO 2 on its surface at high temperature. SiC refractories are available as both non-oxide and

The Influence of TiO 2 Addition on the Modulus of Rupture

 · Considering the raw materials effect on the overall expansion behavior of this sort of refractory as reported in the literature the addition of hydratable alumina colloidal alumina suspension or nanomagnesia can be alternatives to lower the spinel formation starting temperature and reduce the final dimensional variation (Ref 3 4). An effective option to master the expansion behavior of alumina-magnesia castables

Papersrefractories-worldforum

 · Keywords magnesia chromite bricks alumina spinel castable corrosion ladle slag RH degasser ladle thermochemical calculations FactSage Abstract References Full Article Corrosion of Al2SiO5–SiC and Al2SiO5–ZrSiO4 Refractories in the Corroding

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 ·  6 KO Y C CHAN C F. Effect of spinel content on hot strength of alumina-spinel castables in the temperature range 1 000 J 1) Eur Ceram Soc 1999 19 2633–2639.

Reasons for crack propagation and strength loss in

 · alumina reactive alumina hydratable alumina calcium aluminate cement silica fume and colloidal suspen-sions etc.). Therefore when cement is used in a refractory castable s matrix the amount of cement as well as the content of Al 2O 3 in the cement will strongly affect the castable

An experimental investigation of hydration mechanism of

 · Magnesia (MgO) is widely used in the production of refractory materials due to its ultra-high melting point and ability to form the binding system based on M–S–H (M≡MgO S≡SiO 2 H≡H 2 O) phase under moist conditions and in the presence of for example silica fume 1 2 3 4 .Magnesium oxide with high chemical activity can be obtained by optimizing the technological parameters

 · Characterization of tensile failure behaviour of magnesia refractory materials by a modified dog-bone shape direct tensile method and splitting tests. Ceramics International

The Third International Symposium on Refractories

 · Factors Affecting Performance of T-Type Tundish Castable Refractory in China Steel (86) Yu-Chen Lee Taiwan China Study on MgO-CaO Coating Material Used for Tundish (91) Zhu Dezhi He Zhiyong and Zhang Xiaojun China Development and Application of Magnesia Based Dam Block (95) Rong Wei and Yin Jianshu China

MOISTURE PICK UP AND STRENGTH OF HYDRAULIC

 · However the overall strength level of this castable after drying at 450°C is considerably lower when compared to those dried at 200 or 350°C (12 vs. 16 and 21MPa). Therefore drying at 450°C seems in general not to be recommended for Alphabond bonded pre-cast shapes. Only the VIB AB-F does not show the strength loss after 450°C drying.

Papersrefractories-worldforum

 · Keywords magnesia chromite bricks alumina spinel castable corrosion ladle slag RH degasser ladle thermochemical calculations FactSage Abstract References Full Article Corrosion of Al2SiO5–SiC and Al2SiO5–ZrSiO4 Refractories in the Corroding

(PDF) Monoaluminum phosphate-bonded refractory

Phosphate-bonded refractories may be applied as repairing materials due to their short setting time and good thermo-mechanical properties in the °C temperature range. This works addresses the development of vibratable high-alumina castables

Improving MgO-containing castable refractories without

 · The only sample that had strength comparable to the MgO-free control sample had a 3-mass percent addition of Mg(OH) 2 precursor that had been calcined at 600ºC and dried at 1000ºC which showed that within a narrow range magnesia can be part of a castable binder formulation.

Binders for Refractory Castables An Overview SpringerLink

 · Abstract A binder for refractory castables is a bonding material that bonds a loose powdery mix retains its shape after casting and allows the cast shape to set and harden for handling and further processing. A binder also improves sintering as the castables are not compacted during shaping causing poor densification and strength. Initially plastic clay was used as a binder for castables

(PDF) Monoaluminum phosphate-bonded refractory

Phosphate-bonded refractories may be applied as repairing materials due to their short setting time and good thermo-mechanical properties in the °C temperature range. This works addresses the development of vibratable high-alumina castables

Nanotechnology in castable refractoryScienceDirect

 · Silicon carbide (SiC) is popular among researcher as a refractory material because SiC can be stable above 2700 °C and it has high strength ( 800–1000 MPa) and fracture toughness (6–10 MPa m 1/2).It can also be used in aggressive environments due to the formation of a protective coating of SiO 2 on its surface at high temperature. SiC refractories are available as both non-oxide and

Selection of binders for in situ spinel refractory

 · This effect can counterbalance the in situ spinel expansion affecting the volumetric stability of alumina–magnesia refractory castables. Considering these aspects the objective of this paper is to analyze the effect of partial or total replacement of calcium aluminate cement with hydratable alumina on the expansion behavior of alumina–magnesia

Hydratable Alumina-Bonded Suspensions Evolution of

 · Hydratable alumina (HA) is a calcium-free and high-refractoriness binder for alumina-based suspensions. Although recent studies have improved its dispersion mixing and drying behaviours a drawback related to its loss of strength between 250 and 900°C remains unexplored. Pores generated after decomposition of HA curing products are usually an explanation for the effect however no

Hydratable Alumina-Bonded Suspensions Evolution of

 · Hydratable alumina (HA) is a calcium-free and high-refractoriness binder for alumina-based suspensions. Although recent studies have improved its dispersion mixing and drying behaviours a drawback related to its loss of strength between 250 and 900°C remains unexplored. Pores generated after decomposition of HA curing products are usually an explanation for the effect however no

Hydratable Alumina-Bonded Suspensions Evolution of

 · Hydratable alumina (HA) is a calcium-free and high-refractoriness binder for alumina-based suspensions. Although recent studies have improved its dispersion mixing and drying behaviours a drawback related to its loss of strength between 250 and 900°C remains unexplored. Pores generated after decomposition of HA curing products are usually an explanation for the effect however no

An experimental investigation of hydration mechanism of

 · Magnesia (MgO) is widely used in the production of refractory materials due to its ultra-high melting point and ability to form the binding system based on M–S–H (M≡MgO S≡SiO 2 H≡H 2 O) phase under moist conditions and in the presence of for example silica fume 1 2 3 4 .Magnesium oxide with high chemical activity can be obtained by optimizing the technological parameters

Improving MgO-containing castable refractories without

 · The only sample that had strength comparable to the MgO-free control sample had a 3-mass percent addition of Mg(OH) 2 precursor that had been calcined at 600ºC and dried at 1000ºC which showed that within a narrow range magnesia can be part of a castable binder formulation.

Monolithic Refractory Research PapersAcademia.edu

Influence of phosphate binders on the physical and mechanical properties of magnesia carbon monolithics composed of recycled refractory aggregates In this study the effect of using phosphate bonding materials such as sodium hexametaphosphate (SHMP) and sodium tripolyphosphate was investigated in the presence of water and recycled magnesia

Reasons for crack propagation and strength loss in

 · alumina reactive alumina hydratable alumina calcium aluminate cement silica fume and colloidal suspen-sions etc.). Therefore when cement is used in a refractory castable s matrix the amount of cement as well as the content of Al 2O 3 in the cement will strongly affect the castable

Monolithic Refractory Research PapersAcademia.edu

Influence of phosphate binders on the physical and mechanical properties of magnesia carbon monolithics composed of recycled refractory aggregates In this study the effect of using phosphate bonding materials such as sodium hexametaphosphate (SHMP) and sodium tripolyphosphate was investigated in the presence of water and recycled magnesia

Reasons for crack propagation and strength loss in

 · alumina reactive alumina hydratable alumina calcium aluminate cement silica fume and colloidal suspen-sions etc.). Therefore when cement is used in a refractory castable s matrix the amount of cement as well as the content of Al 2O 3 in the cement will strongly affect the castable

MECHANISMS OF WEAR OF REFRACTORY MATERIALS IN SNORKELS OF

the effect of hydratable alumina on the properties of the sic- high alumina- and mgo-based self-flowing castables new approachs to waste magnesia chrome bricks recycling for refractory castable production used at iranian sarcheshmeh copper complex alumina magnesia castables the effect of curing conditions and matrix composition on the

Rheology of refractory concrete An article review

Castables are composed of refractory aggregates with different sizes from 300 μm to 20 mm for strength and hot properties beside matrix components bonding agents modifiers and admixtures as shown in Table 2. The most abundant aggregates are fused or sintered alumina because they have low thermal expansion coefficient and high strength

Al2O3-MgO refractory castables with enhanced explosion

 · The effect of these phases (i.e. derived from MgO and hydratable alumina interaction) when contained in the matrix of magnesia or alumina -based castables has been reported elsewhere. These studies pointed out that the compositions with in situ hydrotalcite generation presented higher mechanical strength after curing and drying steps than

Binders for Refractory Castables An Overview SpringerLink

 · Abstract A binder for refractory castables is a bonding material that bonds a loose powdery mix retains its shape after casting and allows the cast shape to set and harden for handling and further processing. A binder also improves sintering as the castables are not compacted during shaping causing poor densification and strength. Initially plastic clay was used as a binder for castables

The Third International Symposium on Refractories

 · Factors Affecting Performance of T-Type Tundish Castable Refractory in China Steel (86) Yu-Chen Lee Taiwan China Study on MgO-CaO Coating Material Used for Tundish (91) Zhu Dezhi He Zhiyong and Zhang Xiaojun China Development and Application of Magnesia Based Dam Block (95) Rong Wei and Yin Jianshu China

Effect of particle size distribution and calcium

Abstract Previous works based on statistical design of experiments (DoE) defined a model all-alumina self-flow refractory castable (SFRC) with optimized particle size distribution for simultaneous high flowability index (FI) and superior post-sintering performance. This work compares the SFRC rheological behaviour and setting time with those of alternative all-alumina castables with different