Experimental Investigation of the Effect of Polyisobutilene Additives to Mineral Oil on Cooling Characteristics

Lohvynenko, Petro; Moskalenko, A. A.; Kobasko, N. I.; Karsim, L. O.; Riabov, S.V.

doi:10.1520/mpc20150072

Cited by 3 publications

(7 citation statements)

References 6 publications

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“…o C: 1 -no additives at all; 2-7 % of PIB 950; 3-5 % of PIB 1300; 4-4 % of PIB 2400 [13,14] As seen from Fig. 7, a small amount of PIB additives decrease completely film boiling during quenching due to creation of an insulating layer [13,14]. This is a new approach in controlling cooling intensity of liquid quenchants.…”

Section: Materials Sciencementioning

confidence: 95%

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Research on Maximizing Critical and Reducing Initial Heat Flux Densities to Eliminate Any Film Boiling and Minimize Distortion During Quenching

Kobasko¹,

Moskalenko

Lohvynenko

et al. 2017

EUREKA: Physics and Engineering

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In the paper the results of testing three types of FUCHS oils: Thermisol QH 120, Thermisol QH 10 and Thermisol QB 46 are discussed. The main attention is paid to critical heat flux densities evaluation because they create a basis for optimizing cooling intensity of any liquid quenchant. In the paper is underlined that any film boiling during quenching is undesirable since it is a reason for big distortion and non-uniform surface harness. It is shown that intensive quenching decreases distortion of steel parts during quenching. To eliminate film boiling during quenching in mineral oils, optimal temperature of oil should be chosen which maximize the first critical heat flux density and special additives should be used to decrease initial heat flux by creating surface micro-coating. Along with the evaluation of heat transfer coefficients, critical heat flux densities inherent to liquid quenchant must be measured first to optimize quenching processes. International DATABASE on cooling characteristics of liquid quenchants must include critical heat flux densities, initial heat flux densities, and heat transfer coefficients allowing optimizing and governing quenching processes.

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Section: Materials Sciencementioning

confidence: 95%

“…Also, special additives creating micro-insulating layer on the surface of steel parts are used to decrease initial heat flux density and by this way eliminate film boiling (Fig. 7) [13,14]. o C: 1 -no additives at all; 2-7 % of PIB 950; 3-5 % of PIB 1300; 4-4 % of PIB 2400 [13,14] As seen from Fig.…”

Section: Materials Sciencementioning

confidence: 99%

Research on Maximizing Critical and Reducing Initial Heat Flux Densities to Eliminate Any Film Boiling and Minimize Distortion During Quenching

Kobasko¹,

Moskalenko

Lohvynenko

et al. 2017

EUREKA: Physics and Engineering

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“…Focusing on this idea, the authors used for testing different kinds of oils, I-8A, I-12A, I-20A, and an Inconel 600 cylindrical probe 10 mm in diameter and 30 mm long. The thermal conductivity and diffusivity of Inconel 600 are provided in Table 1 [5]. A thermocouple was located at the center of the probe.…”

Section: Materials Methods and Experimental Proceduresmentioning

confidence: 99%

“…In the paper a patented technology is discussed [1]. In 1987 authors proposed an original idea [2] on the possibility of eliminating film boiling during quenching by creating an insulating layer on the surface of steel parts to be hardened.…”

Section: Introductionmentioning

confidence: 99%

“…In this case technology becomes significantly cheaper resulting in decreased distortion of the steel parts after quenching. Recently, authors of an original investigation [5] reported on the possibility to eliminate film boiling completely during quenching in mineral oil I-20A if PIB-2400 in amount of 3 % is added to mineral oil. Authors were sure that such phenomenon is connected with the physical properties change of oil I-20A, specifically a change to the surface tension due to presence of PIB-2400 in oil in the amount of 3 %.…”

Section: Introductionmentioning

confidence: 99%

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An Effect of Pib Additives to Mineral Oil Resulting in Elimination of Film Boiling During Steel Parts Quenching

Kobasko¹,

Moskalenko

Lohvynenko

et al. 2016

EUREKA: Physics and Engineering

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To control the process of film boiling during quenching in oils, quench oil makers as a rule manipulate physical properties such as a surface tension and viscosity. However, there is much experimental data showing that special additives can eliminate film boiling in oils without changing their physical properties and which is counterintuitive. Authors explain such phenomenon by showing that the addition of a special additive, for example PIB (polyisobutylene polymer), will create an insulating layer on the surface of steel parts during quenching in oils that will eliminate film boiling without affecting physical properties of the oil. Insulating layer decreases initial heat flux density which becomes less than critical one and of the oil will not begin film boiling during quenching with the PIB additive. Authors believe that such approach will allow engineers to solve effectively the problem of part distortion after quenching. The new oil quenchant containing special additive PIB is patented in Ukraine and is manufactured by Barkor Ltd for needs of the heat treating industry.

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Impact Mechanism of Interfacial Polymer Film Formation in Aqueous Quenchants

Peter¹,

Anatoly²

2020

IJFMTS

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The results of studies of the cooling ability, rheological and surface-active properties of aqueous solutions of polyalkyleneglycol, sodium salt of carboxymethyl cellulose and polyacrylamide are presented. The choice of polymers is due to the problem of studying the mechanism of the cooling process in aqueous solutions of polymers. Comparison of the results of complex studies and video surveillance made it possible to propose a substantiated version of the mechanism of heat transfer during cooling of a metal sample in aqueous solutions of polymers. At the moment of shock boiling, a substance is formed in the wall layer, which is a nanosol (for PAG solutions) or a nanogassuspension (for Na-CMC and PAA). Under the action of a shock wave, it is directed from the heated metal surface to the interface between the polymer solution-vapor film, forming an interfacial polymer shock film. One of the stages of the shock mechanism of the formation of a polymer film is the adsorption increase in the polymer concentration on the surface of the bubbles formed during shock boiling; the next stage, the polymer shell of the bubbles, is spent on the formation of an interfacial polymer film. Heat fluxes and heat transfer coefficients are presented as a function of polymer concentration and surface temperature. The research results can be useful for assessing the effect of an interfacial polymer film on the ratio of the initial, first q cr 1 and second q cr 2 critical heat fluxes density, which determines the passage of heat transfer stages in water-polymer quenching media (WPQM).

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Experimental Investigation of the Effect of Polyisobutilene Additives to Mineral Oil on Cooling Characteristics

Cited by 3 publications

References 6 publications

Research on Maximizing Critical and Reducing Initial Heat Flux Densities to Eliminate Any Film Boiling and Minimize Distortion During Quenching

Research on Maximizing Critical and Reducing Initial Heat Flux Densities to Eliminate Any Film Boiling and Minimize Distortion During Quenching

An Effect of Pib Additives to Mineral Oil Resulting in Elimination of Film Boiling During Steel Parts Quenching

Impact Mechanism of Interfacial Polymer Film Formation in Aqueous Quenchants

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