Physico-chemical properties and microstructure of hydroxyapatite-316L stainless steel biomaterials

Abstract

Sintering shrinkage, compressive strength, bending strength, metallurgical morphology, microstructure and chemical composiIion diffusion of hydroxyapatite-316L stainless steel(HA-316L SS) composites were investigated. The results show that the sintering shrinkage of HA-316L SS composites decreases from 27.38% to 8.87% for cylinder sample or from 27.18% to 8.62~ for cuboid sample with decreasing the volume ratio of HA to 316L SS, which leads to higher sintering activity of HA compared with that of 316L SS. The compressive strength of HA-3161. SS composites changes just like parabolic curve (245.3--~126.3--,-202.8 MPa) with reducing the volume ratio of HA to 316L SS. Bending strength increases from 86.3MPa to 124. 2 MPa with increasing the content of 316L SS. Furthermore, comprehensive mechanical properties of 1.0 : 3.0 (volume ratio of HA to 316L SS) composite are optimal with compressive strength and bending strength equal to 202. 8 MPa and 124.2 MPa, respectively. The microstructure and metallurgical structure vary regularly with the volume ratio of HA to 316L SS. Some chemical reaction takes place at the interface of the composites during sintering.

Corrosion behavior of HA-316L SS biocomposites in aqueous solutions

“…In the 50% HA-316L composite some steel grains are rich in Ca and O too (P12- Figure 1d, Table 1) and in the HA regions, besides the presence of Ca, P and O, Fe and Cr were also detected (P11- Figure 1d, Table 1). This could be related to some reaction between 316L steel and HA during sintering 7 . Similarly, in the HA regions of the 20% HA-316 composite, Fe, Cr and Ni are present (P8- Figure 1c, Table 1).…”

“…Fan et al 9 studied the formation of bone-like apatite on HA/316L SS composites in simulated body fluid (SBF) and proved that the composites are excellent bioactive materials. Nevertheless, HA is brittle and the mechanical resistance of the HA-316L composites is lower than that of 316L stainless steel 7 . It is well known that stainless steels are generally passive in neutral media but are susceptible to pitting and crevice corrosion in chloride media.…”

“…Simultaneously, the HA coating helps to prevent the release of metal ions from the steel implant and their accumulation in the internal organs. Another alternative to improve the interaction between the steel implant and the bone is the development of 316L steel based biocomposites containing HA [6][7][8][9][10] . Fan et al 9 studied the formation of bone-like apatite on HA/316L SS composites in simulated body fluid (SBF) and proved that the composites are excellent bioactive materials.…”

Effect of sintering parameters on physical and mechanical properties of powder injection moulded stainless steel-hydroxyapatite composite

“…Therefore, HA with good mechanical properties is required to expand its application in the bone implant application. In order to improve the mechanical properties of HA, several works have been conducted by adding a mixture of metallic element in HA and produce a metal-ceramic composite [ 24 , 25 , 26 ]. Such approach has been conducted Zou et al .…”

Fabrication, property characterization and toughening mechanism of HA-ZrO2(CaO)/316L fibre composite biomaterials

“…Since bending strength of HA/316L powder composites is 85 127 MPa [13] , toughening effect of 316L fibre is better than that of 316L powder. Young's modulus of HA-ZrO 2 (CaO)/316L fibre composites is 103.1 123.5 GPa ( Figure 5), which is larger than that of human bone (7 25 GPa) and much lower than that of ZrO 2 (210 GPa) or Al 2 O 3 (380 GPa) inert bioceramics.…”