Fibre Laser Cutting and Chemical Etching of AZ31 for Manufacturing Biodegradable Stents

Table 3

Physical properties of the biodegradable stent material AZ31, the traditional stent material AISI 316L, and the oxides of their main alloying components, MgO and FeO [27–30].

		AZ31	AISI 316L	MgO	FeO
Density	𝜌 (kg/m^3)	1770	8000	3580	5700
Heat capacity	𝑐𝑝 (J/kgK)	1020	500	920	803
Melting temperature	𝑇𝑚 (K)	905	1723	3098	1643
Boiling temperature	𝑇𝑏 (K)	1363	3273	3533	N/A
Thermal conductivity	𝐾 (W/mK)	96	21.5	50	10
Thermal diffusivity	𝛼 (m^2/s)	5.32⋅10^−5	0.54⋅10^−5	1.52⋅10^−5	0.22⋅10^−5
Oxidation enthalpy	Δ𝐻 (kJ/mol)	−602 (Mg)	−260 (Fe)	N/A	N/A
Viscosity at 𝑇𝑚	𝜂 (mPa s)	1.25 (Mg)	6	1.41	40