Determination of interface heat transfer coefficient between aluminum casting and graphite mold

Баженов, В. Е.; Колтыгин, А. В.; Tselovalnik, Yu. V.; Sannikov, A. V.

doi:10.3103/s1067821217020031

Cited by 19 publications

(3 citation statements)

References 25 publications

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“…The differences in R c or s gmax exceed 30%. This indicates that the technology of graphite production significantly affects its final properties [8,9]. It is very important to keep the porosity P at a very low level; therefore, the impregnation of graphite at the stage of graphitization during the technological process plays an important role.…”

Section: Determination Of Resistance Indicatorsmentioning

confidence: 99%

Effect of Graphite Microstructure on their Physical Parameters and Wettability Properties

et al. 2021

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To produce castings of titanium, nickel, zinc, copper and many other metal alloys, graphite molds can be used. Using graphite molds has many advantages, including that no lubricate or coating layers are needed, a high cooling rate, and ease of production of complex shapes. However, for high quality castings, high quality graphite is required with high mechanical properties and a high heat transfer coefficient. Since there is no room for adjusting the chemical composition of graphite molds, the most important factor determining the properties of the molds is their production process. Thus, in the present study, mechanical properties of two different types of graphite are investigated. The two types of graphite were produced by different technological processes: a typical process of graphite production from isotropic coke, and an electrolytic method of production. The research included mechanical testing and structural investigation by scanning electron microscopy. Chemical analysis was performed by Energy Dispersive x-ray Spectroscopy, and x-ray phase analysis was performed by XRD. Mechanical properties were determined by compression and three-point flexural testing at room temperature. It was found that the porosity of graphite is the key parameter determining its mechanical properties. In addition, it was found that mechanical anisotropy of graphite is dependent on the production method where the size and distribution of pores play an important role.

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Section: Determination Of Resistance Indicatorsmentioning

confidence: 99%

Effect of Graphite Microstructure on their Physical Parameters and Wettability Properties

et al. 2021

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“…Therefore, the exothermic heat release, and hence the oxidation effects are not included in our thermal model. Moreover, the heat transfer between air and graphite is ignored, as it is quite negligible (~1.2%) compared to the heat transfer along the thickness of the graphite sheet even at high temperatures [56].…”

Section: Thermal Properties Of Graphitementioning

confidence: 99%

Photon diffusion in microscale solids

Das

Brown

Mah³

et al. 2019

J. Phys.: Condens. Matter

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This paper presents a theoretical and experimental investigation of photon diffusion in highly absorbing microscale graphite. A Nd:YAG continuous wave laser is used to heat the graphite samples with thicknesses of 40 μm and 100 μm. Optical intensities of 10 kW cm−2 and 20 kW cm−2 are used in the laser heating. The graphite samples are heated to temperatures of thousands of kelvins within milliseconds, which are recorded by a 2-color, high speed pyrometer. To compare the observed temperatures, differential equation of heat conduction is solved across the samples with proper initial and boundary conditions. In addition to lattice vibrations, photon diffusion is incorporated in the analytical model of thermal conductivity for solving the heat equation. The numerical simulations showed close matching between experiment and theory only when including the photon diffusion equations and existing material properties data found in the previously published works with no fitting constants. The results indicate that the commonly-overlooked mechanism of photon diffusion dominates the heat transfer of many microscale structures near their evaporation temperatures. In addition, the treatment explains the discrepancies between thermal conductivity measurements and theory that were previously described in the scientific literature.

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“…%): сухого коллоидального графита 20-25 и графитовых порошков 75-80 марок ГМЗ, ЭК зернистостью 0,03-0,1 мм [11]. Использование графитовых форм позволяет производить отливки с улучшенными механическими свойствами (из-за высокой скорости охлаждения) и высокой точностью размеров [12].…”

Section: удк 669 ббк 343 э94unclassified

Технологии Изготовления Индивидуально Разрабатываемых Эндопротезов Из Титановых Сплавов

Кенжалиев¹,

обогащения»²,

Чукманова³

2018

Эффективные Технологии Обогащения Минерального И Техногенного Сырья

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An analytical review of the methods of manufacturing implants from titanium alloys is presented. The characteristics of such methods as milling, casting, laser sintering of powder materials are shown. The main advantages and disadvantages of these methods are formulated. It is noted that the physico-chemical properties of titanium alloys cause a wide application in the manufacture of implants and endoprostheses.

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Determination of interface heat transfer coefficient between aluminum casting and graphite mold

Cited by 19 publications

References 25 publications

Effect of Graphite Microstructure on their Physical Parameters and Wettability Properties

Effect of Graphite Microstructure on their Physical Parameters and Wettability Properties

Photon diffusion in microscale solids

Технологии Изготовления Индивидуально Разрабатываемых Эндопротезов Из Титановых Сплавов

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