Phase and structural transformations in refractory SHS-materials

Karpukhin, I. A.; Vladimirov, V. S.; Moizis, S. E.

doi:10.1007/s11148-006-0026-9

Cited by 3 publications

(9 citation statements)

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“…The adhesive at room temperature was composed of amorphous phase, un‐reacted Al(OH) 3 , and Si. Meanwhile, as there was no crystal peaks of CuO appeared at the spectrum, it demonstrated that the adhesive matrix and CuO reacted and formed the amorphous phase which possessed a kind of network structure …”

Section: Resultsmentioning

confidence: 99%

“…The larger the network structure of amorphous phase was, the higher the bonding strength of the adhesive was. Moreover, the adhesive's curing was completed at room temperature through the polymerization of phosphates and CuO as well as the evaporation of water . Judging from Figs.…”

Section: Resultsmentioning

confidence: 99%

“…The adding of Si can enhance adhesive's bonding strength because it can be oxidized with certain volume expansion in the heat‐treatment process as well as its oxidation product participates in the formation of heat‐resistant phases. Besides, CuO can accelerate the adhesive's curing through the polymerization between phosphates and CuO . As is known, the phosphate bonding occurs in two ways: chemical bonding resulting from the chemical reaction and adhesive binding resulting from the formation of amorphous or crystalline condensed phosphates which have the appropriate bonding properties .…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Performance of the Room‐Temperature‐Cured Heat‐Resistant Phosphate Adhesive for C/C Composites Bonding

Wang

Liu

Guo

et al. 2014

Int J Applied Ceramic Tech

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Carbon/carbon(C/C) composites were bonded with a phosphate adhesive prepared from H3PO4 (orthophosphoric acid) and Al(OH)3 as the matrix and Si and CuO as the inorganic fillers. The mechanical properties were tested at room temperature after the bonded specimens were treated from RT to 1500°C. The results showed that the addition of CuO could greatly improve the adhesive's mechanical properties due to the formation of CunSi (copper silicides). The shear strength of bonded specimens could be up to 8.2 MPa without heat treatment and remain above 2 MPa within the whole heat‐treatment temperature range.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation and Performance of the Room‐Temperature‐Cured Heat‐Resistant Phosphate Adhesive for C/C Composites Bonding

Wang

Liu

Guo

et al. 2014

Int J Applied Ceramic Tech

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“…SHS processes in multicomponent systems are complicated [11] and proceed in several successive and parallel stages, which include evaporation of volatile impurities, a change in the aggregate state of one or several initial components (melting) and gas-transport processes (in the heating zone of the SHS wave), formation of grains of intermediate and final phases with respect to exothermal reactions with participation of one-or multicomponent melts (in the zone of the thermal reaction), and final structure formation and partial sintering of the products of heterogeneous interaction in the burn-down zone of the SHS wave [1,12].…”

Section: Resultsmentioning

confidence: 99%

“…According to XPA data, after SHS and subsequent calcination in the furnace for 1 h elementary silicon completely vanishes in the products of synthesis and the fraction of unbound aluminum oxide decreases. According to [11] when aluminum oxide interacts with liquid silicon, which is formed in this system according to the reaction (1), kyanite Al 2 O 3 × SiO 2 can form. According to the XPA results, this compound is absent in the final products.…”

Section: Resultsmentioning

confidence: 99%

Obtaining heatproof coatings on fireclay refractories by SHS

2011

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The possibility of obtaining heatproof coatings on fireclay refractories by self-propagating high-temperature synthesis in the system MgO -SiO 2 -Al using as the binder liquid sodium glass with the additives sodium tripolyphosphate and titanium dioxide, the latter activating the SHS process, is investigate. The optimal composition is determined and the physical-mechanical properties and the macro-and microstructure of the coatings are investigated.Protective heatproof coatings and methods of synthesizing them are chosen on the basis of certain criteria, among which are, for example, good adhesion of the coating to the refractory, closeness of the CLTEs of the coating and the base, and others.In the last ten years the energy-efficient method of selfpropagating high-temperature synthesis (SHS), discovered in 1967 by A. G. Merzhanov and his colleagues, has been used to obtain ceramic refractories and protective coatings on steel [1]. SHS is an intense exothermal interaction of the components in the condensed phase that propagates along a reaction mix similarly to a wave of combustion. The method is characterized by low energy consumption, simple equipment, high speed of the process, high productivity, purity of the products, possibility of synthesizing ceramics with different composition and function, as well as mechanisms of phase and structure formation in the final product which are unusual from the stand point of conventional materials engineering. The exothermal interaction during SHS can proceed in the form of a wave of combustion (classical SHS) and in a fast volume reaction regime (thermal explosion) [1].The SHS method has been used to synthesize refractories in the system MgO -MgAl 2 O 4 [2], masonry mortar in the system Al -Fe 2 O 3 -chromite ore [3], materials based on aluminomagnesia and chromomagnesia spinel [4,5], the refractory system SiC -Al 2 O 3 [6], and materials based on mullite [7]. The SHS method is also convenient to use for producing single refractories, for example, high-temperature articles and various coats, coatings, and solutions.The objective of the present work is to synthesize by the SHS method heatproof coatings on fireclay refractories, used as linings for tanks in heating units, for example, for melting aluminum. The system MgO -SiO 2 -Al was chosen to obtain refractory and chemically stable phases -aluminomagnesia spinel and mullite.Secondary resources -shards of magnesite brick (MgO) (TU 32-34-032-94), silicon dioxide SiO 2 (grade B quartz dust) with particle size less than 315 mm and PAP-2 (GOST 5494-95) aluminum powder -were used as the component of the reaction mixture. The source heat release, supporting the flow of the SHS process in this system, must be a reaction of aluminothermic reduction of silicon oxide. STUDY PROCEDUREThe system MgO -SiO 2 -Al was investigated to obtain protective heatproof coatings based on a spinel phase and aluminosilicate. Silicon dioxide SiO 2 and aluminum powder served as exothermal reagents, magnesium oxide MgO served as the filler and liquid s...

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Geopolymer Binders in Composite Cements and Ceramic-Like Materials

Kaps

Hohmann

2010

Advances in Science and Technology

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Two types of geopolymeric networks have been prepared and characterized: aluminosilicatic binders(1) generated of metaclays for composite cements and iron-phosphate binders(2) formed of iron oxyhydroxites for applications in strong acidic environments. The focus of the investigations was on the influence of the thermal(1) or the acidic(2) activation on the structure and properties of the materials. In both cases, the amount of present water plays an essential role.

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Phase and structural transformations in refractory SHS-materials

Cited by 3 publications

References 0 publications

Preparation and Performance of the Room‐Temperature‐Cured Heat‐Resistant Phosphate Adhesive for C/C Composites Bonding

Preparation and Performance of the Room‐Temperature‐Cured Heat‐Resistant Phosphate Adhesive for C/C Composites Bonding

Obtaining heatproof coatings on fireclay refractories by SHS

Geopolymer Binders in Composite Cements and Ceramic-Like Materials

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