Refractory plastic mixtures based on highly concentrated ceramic binding suspensions (HCBS). 1. Structural and mechanical properties of suspensions (Pastes) of refractory clays

Pivinskii, Yu. E.; Doroganov, V. A.; Doroganov, E. A.

doi:10.1007/bf02693769

Cited by 11 publications

(6 citation statements)

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“…Thus, tests performed on compounds by the methods examined above permit obtaining an adequate set of structural-mechanical parameters characterizing the system as solid or plastic body in the range of shear stresses for which a flow regime with the maximum friction (Shvedov creep [5,6,10,15]). At the same time a critical analysis shows that the same parameter obtained using different instruments has a different name.…”

Section: M Tolstoi's Plastometer With Parallel-moving Plate Constmentioning

confidence: 99%

“…The result of the measurements is a set of curves of the development of deformations in time. The process of deformation development is described satisfactorily by the Maxwell -Shvedov and Kelvin model [1,6,9,15] …”

Section: Stamp With a Constant Cross Sectionmentioning

confidence: 99%

“…For example, the moisture content of a compound can be determined according to the value of the plastic strength [1,6,15,17]. A stamp with a constant cross section is suitable for studying compounds which have a short induction period, for example, molding compounds containing ce- ment [1,16,21].…”

Section: M Tolstoi's Plastometer With Parallel-moving Plate Constmentioning

confidence: 99%

“…instruments with a plane-parallel gap (measurement of the development of tangential displacement in time) [4,5,6,15];…”

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confidence: 99%

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Methods of measuring the rheological properties of compounds for extrusion

Prokof’ev

2010

Glass Ceram

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A classification is given for methods of measuring the rheological properties of ceramic compounds for extrusion. Depending on the magnitude of the shear stresses under which the testing is performed, it is proposed that the methods of investigation be divided into structural-mechanical and rheological. The most informative methods as well as the structural-mechanical and rheological parameters obtained with these measurements are described. Recommendations are given for using each method for scientific investigations and for checking the parameters of the molding compounds in the production of extruded ceramic articles.

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Section: M Tolstoi's Plastometer With Parallel-moving Plate Constmentioning

confidence: 99%

Section: Stamp With a Constant Cross Sectionmentioning

confidence: 99%

Section: M Tolstoi's Plastometer With Parallel-moving Plate Constmentioning

confidence: 99%

“…instruments with a plane-parallel gap (measurement of the development of tangential displacement in time) [4,5,6,15];…”

mentioning

confidence: 99%

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Methods of measuring the rheological properties of compounds for extrusion

Prokof’ev

2010

Glass Ceram

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“…Introducing highly dispersed refractory clays into "lean" HCBSs provides a route towards plastic mixes with quite satisfactory molding properties at relatively low molding pressure [1,4]. The concentration of plasticized HCBSs may vary within 35 -45% (by weight) or within 40 -55% (by volume) depending on the HCBS granular composition, molding pressure, etc.…”

mentioning

confidence: 99%

Structure-Mechanical Properties of Plasticized Mixes Based on Highly Concentrated Ceramic Binding Suspensions (HCBS) of High-Alumina Chamotte

Doroganov

Pivinskii

2005

Refract Ind Ceram

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Plastic mixes based on high-alumina chamotte HCBS and a multifractional refractory filler are prepared; the mixes molded at low pressures (30 MPa) make it possible to obtain materials with an initial porosity of 14 -15%. This effect is attained by adding a composite plasticizer (a refractory clay and a complex organomineral thinner) to the mix.Highly concentrated ceramic binding suspensions (HCBS) and HCBS-based plastic (plasticized) mixes are promising in the technology of unshaped refractories [1 -4]. From this standpoint, of special interest are high-alumina mixes.Efficiency of composite additives. It was shown in [5] that a highly dispersed refractory clay and a complex organomineral thinner (COMT) (composed of sodium tripolyphosphate and SB-5 organic plasticizer) when added to the high-alumina chamotte (75% Al 2 O 3 ) HCBS produced an exceptional thinning and plasticizing effect. Relevant illustrative data are shown in Figs. 1 and 2. The difference in porosity of green specimens free of COMT (Fig. 1a, curve 1 ) and containing COMT (curve 2 ) amounts to 2.5%. As the concentration of clay C is raised, the difference tends to increase, and at C = 3%, it reaches 8%. This difference is likewise retained in specimens heat-treated at 1000 and 1300°C ( Fig. 1b and c). The compressive strength of green and heat-treated specimens is likewise controlled by the clay concentration (Fig. 2). In clay-free specimens, the compressive strength s c does not differ much, 20 and 22 MPa (Fig. 2a, curves 1 and 2 ). With increase in C, curves 1 and 2 behave in a different manner; their course is quite clear and does not need detailed comment. Relationships compressive strength versus concentration C for heat-treated specimens are shown in Fig. 2b and c).It was noted in [5] that the high efficiency of the composite additive (COMT + refractory clay) is due to its ability to reduce the amount of kinetically bound liquid in HCBS-based systems.Elastoplastic viscous properties. Introducing highly dispersed refractory clays into "lean" HCBSs provides a route towards plastic mixes with quite satisfactory molding properties at relatively low molding pressure [1, 4]. The concentration of plasticized HCBSs may vary within 35 -45% (by weight) or within 40 -55% (by volume) depending on the HCBS granular composition, molding pressure, etc. In analogy with refractory castables [4,6], the moldability (placeability) of plastic mixes is mainly controlled by rheological properties of the matrix. Therefore it was of interest to explore rheological properties of HCBS in a flow state [5] and in a plastic state which is attained by partial dehydration of precursor HCBS.Our goal in this work was to study in some detail elastoplastic viscosity and structure-mechanical properties of precursor HCBS (free of additives) and HCBS containing additives COMT and refractory clay. Structural and mechanical properties of plastic mixes are typically characterized in terms of the yield limit, elasticity, plasticity, and plastic viscosity [7 -9].

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