Abstracts Book - IMRC 2018

• SB6-P023
INFILTRATION OF MAGNESIUM IN STRUCTURES NUKBONE
POROUS BY THE CAIS TECHNIQUE
José de Jesús Martínez González 1 , Sebastián Díaz de la Torre 1 , María Cristina Piña Barba 2 , Isaac
Muñoz Juarez 1
1 Centro de Investigación e Innovación Tecnológica, Advanced Materials, Mexico. 2 Universidad
Nacional Autónoma de México, Biomaterials, Mexico.
An alternative metallic-ceramic infiltration process is currently developed in
Centro de Investigación e Innovación Tecnológica CIITEC, which belongs to
Instituto Politécnico Nacional IPN, under the name of CAIS (Current Assisted
Infiltration Sistering). This technique consists of energizing a metallic powder,
which is hold in a graphite dies set, through which the passage of pulsed direct
current DC takes place until the powder reaches its melting temperature Tm.
Next to reaching Tm, uni-axial load pressure is applied directly on the punches
so that the infiltrate fills up into the cavities/pores of the substrate material. On
searching alternative biomaterials that, once performed its function of giving
mechanical support to broken bones and its useful life time has ended, but still
placed inside the patient, and also pursuing that it might dissolved through a
natural process of biodegradation, which cannot lead to secondary effects for
the patient, the CAIS technique is used. In this research, a commercial bovine
de-cellular porous bone growth support called Nukbone ® is used as the
infiltration matrix whereas magnesium powder is used as the infiltrate. The
latter conferring characteristics of plasticity to the composite. A heating ramp of
100 ° C per minute is established room temperature to 750 ° C, so that once the
Mg melting temperature is exceeded, 3kN is applied directly on the punch,
forcing this way to the metal to infiltrate into the porous network of Nukbone.
Thus, Nukbone ® porous structures are homogeneously infiltrated up to 90%.
When making the comparison of the initial and final composition of the infiltrate,
no phase changes are detected. This infiltration process is achieved in less than
15 minutes and bio-degradable bio-screw geometries are obtained.
Keywords: magnesium, infiltration, Nukbone
Presenting authors email: jose_mtz09@hotmail.es