Synthesis of Ti-Based Glassy Alloy/Hydroxyapatite Composite by Spark Plasma Sintering

Abstract

The spark plasma sintering process has been used to fabricate Ti 40 Zr 10 Cu 36 Pd 14 glassy alloy/hydroxyapatite composites. XRD, DSC, SEM and compression testes were used to examine the microstructure and properties of the composites. No crystallization was observed in the glassy alloy matrix. The glass transition temperature (T g ) is independent of the HA addition and the onset temperature of crystallization (T x ) slightly decreases with increasing HA content. The sintered composite exhibited reduced value of Young's moduli as compared with the as-cast Ti 40 Zr 10 Cu 36 Pd 14 bulk glassy alloy.

Effect of hydroxyapatite content on the microstructure, thermal and mechanical properties of Ti-based glassy alloy/hydroxyapatite composite prepared by spark plasma sintering

“…In addition, the decrease in contact area due to increasing HA content also depresses coalescence of glassy alloy powders thus influences the homogeneous distribution of glassy alloy phase in the composite. The fact that compressive strength of the sintered samples decreases with increasing HA content may be attributed to three possible reasons: 1) the HA phase has lower strength which results from the insufficient densification under the present sintering conditions; 2) decreasing direct contact areas among glassy alloy powders affect the neck formation during the sintering process, hence the lower strength of the sintered composite samples [17]; 3) partial crystallization of glassy alloy powders decrease the compressive strength of glassy alloy matrix. The third reason may account for the sharp decrease of compressive strength when HA content is higher than 2 wt%.…”

“…Moreover, traditional sintering methods cannot be used for synthesis of Ti-based glassy alloy/HA composite as high sintering temperatures would give rise to crystallization of glassy alloy matrix. Therefore, a novel rapid sintering technique, spark plasma sintering (SPS), was introduced to prepare Ti-based glassy alloy/HA composite at lower temperatures and in a shorter time than the traditional sintering process to prevent crystallization [17]. In the present paper, we focus our interest in the effect of HA content on the microstructure, thermal and mechanical properties of Ti-based glassy alloy/HA composite prepared by SPS method.…”

Ti Particles Dispersed Ti-Based Metallic Glass Matrix Composite Prepared by Spark Plasma Sintering

“…This favors the sintering of MG materials or metastable phase materials. 23) In the present work, the sintering temperature is 643 K, which is far lower than the crystallization temperature (723 K). Therefore, the crystallization during sintering would not occur.…”

“…In addition, Ti 40 Zr 10 Cu 36 Pd 14 MG powders would also have a strong deformation during the sintering process due to the viscous flow of MG at the high temperature above 0.7T g . 23) These deformations cause the reduction of the pores in the sintered samples. The bonding at the interface between MG matrix and Ti particles can be improved through the formation of the protrusion by both plastic deformation of Ti particles and viscous flow deformation of MG powders.…”

“…Hence, the MG powders were partially crystallized. 23) In the present work, Ti particles were chosen as improve phase. Above mentioned partial crystallization was avoided completely.…”