MEDICAL DEVICES BASED ON BIOINSPIRED CERAMICS - Advanced Biomaterials: Fundamentals, Processing, and Applications - page 355

Wood

Pyrolysis

Precise
machinning

Si infiltration

Low-cost
net-shape biosic

Figure 11.1. Schematic of the bioSiC fabrication process.

A

f

A

I

A

e

S

R

T

R R

T

T

r

0.2 mm

Figure 11.2. Microstructure of a ring-porous hardwood (left) and softwood (right).39 Noted
features are planes perpendicular to the axial (A), radial (R), and tangential (T) directions, sap
channels (s), fi ber cells (f), rays (r), earlywood (e), and latewood (l).

These wood pieces are dried at 100 °C for a few hours and pyrolyzed in argon
atmosphere with well-controlled heating and cooling ramps up to 1100 °C to
create carbonaceous performs that mimic the wood microstructure (Figure 11.3).
Typically in all kind of woods, approximately 75 ± 5% of the starting weight of the