Dependency of thermal conductivity on the temperature and composition of d-camphor in the neopentylglycol–d-camphor alloys

Bayram, Ümit; Aksöz, Sezen; Maraşlı, Necmetti̇n

doi:10.1016/j.tca.2011.12.021

Cited by 9 publications

(2 citation statements)

References 19 publications

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“…3 the difference of thermocouples readings, DT * , at the melting temperature of organic material was ±0.1-0.2 K. As can be seen from Table 1, the temperature difference between two fixed thermocouples, DT = T 1 -T 2 at above 308 K setting temperature was 15-30 K. Thus, the uncertainty in the temperature measurement at 308 K is less than 0.5 %. Therefore, the total fractional uncertainty in the measurements of thermal conductivity of solid phases is about 5 % [28,29]. Determination of the temperature coefficient According to reports [3] and [17], the dependence of the thermal conductivity of solid phase on the temperature for a given composition can be expressed as…”

Section: Measurement Of Thermal Conductivity Of Solid Phasementioning

confidence: 99%

Temperature dependency of thermal conductivity of solid phases for fatty acids

Bayram

Aksöz

Maraşlı

2014

J Therm Anal Calorim

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Thermal conductivity variations with temperature of solid phases for lauric acid (LA), myristic acid (MA), pivalic acid (PA), and stearic acid (SA) have been measured with radial heat-flow method. Temperature dependencies of the thermal conductivity for same organic materials have been obtained by linear regression analysis. From graphs of thermal conductivity versus temperature, the thermal conductivity of solid phase at their melting temperature and temperature coefficients of thermal conductivity for LA, MA, PA, and SA have been found to be 0.37, 0.39, 0.23, and 0.35 W K -1 m -1 and 0.00935, 0.00446, 0.01095, and 0.00295 K -1 , respectively. The ratios of thermal conductivity of liquid phase to thermal conductivity of solid phase for LA, MA, PA, and SA have also been measured to be 0.52, 0.48, 0.25, and 0.59, respectively, with a Bridgman-type directional solidification apparatus.

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Section: Measurement Of Thermal Conductivity Of Solid Phasementioning

confidence: 99%

Temperature dependency of thermal conductivity of solid phases for fatty acids

Bayram

Aksöz

Maraşlı

2014

J Therm Anal Calorim

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“…1 (a). At ordinary temperatures and pressure, camphor sublimates into its gas, avoiding liquid form [7]. Needle coke is a special type of petroleum product prepared with coal and crude oil through delayed cocking and calcining process.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Porosity of the Ceramic Shell in Investment Casting Process Using Needle Coke and Camphor

Tamta

Karunakar

2014

AMM

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Investment casting process has been a widely used process for centuries. It is known for its ability to produce components of complex shapes with dimensional accuracy and excellent surface finish. Investment casting has been used to make manufacture weapons, jewellery and art castings during the ancient civilization and today it is used to manufacture engineering components. In Investment casting wax patterns are made by wax injection and then coating of the wax patterns are done by ceramic slurry, made with silica flour and binder. After dewaxing and firing molten metal is poured in the shell and solidified casting can be achieved. Investment casting can be cast any ferrous and non ferrous metal which is difficult in die casting. Finishing operations are negligible and very thin sections as.75mm can also be cast which is not possible in sand casting but there are many challenges in Investment casting. It is relatively slow process because preparation of ceramic shell consumes a lot of time, permeability of shell is very low which causes gas permeability. Incorporation of chills is very difficult. Among all these challenges gas porosity is main problem because of poor permeability, entrapment of gases due to complex geometry of the shell, reuse of scrap metal. In the present work porosity of the shell can be increase by addition of mixture of Camphor and needle coke. After firing of the shell camphor and needle coke will be burnt leaving pores for the escape of entrapped gases. Mechanical properties of the both shell will be compared with each other.

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