Which of the glass do you select from the table below to join silicon carbide (SiC) rods. Justify your answer and show complete work. Material/properties Elastic modulus Thermal expansion Thermal coefficient (x106/°C | (MPa.m2) conductivity at 25-1000°C) (GPa) (W/m.K) SiC 410 4.0 4.6 120 Glass I 70 0.5 0.6 1.38 Glass II 75 4.5 1.0 2.00 Glass III 72 8.0 1.0 2.00

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Temperature Difference and Heat Transfer

Whenever there is a flow of heat flux resulting from a temperature gradient within the material or between two materials, there is heat transfer. Heat transfer primarily arises due to temperature differences between two bodies or within bodies. The term temperature gradient denotes temperature differences or variation of temperature due to change in some quantity. The fundamental use of the concept of temperature is found in the zeroth law of thermodynamics.