Properties Research Of TC4/HA Biomedical Composite Materials Prepared By SPS

In this paper, the Ti6A14V alloy and hydroxylapatite (HA) and their composite materials in biomedical applications were generalized. The sintering mechanism application status and development trend of the discharge plasma sintering (SPS) method were presented.We tried to create a composite material of Ti6Al4V and hydroxylapatite (HA) through the discharge plasma sintering (SPS) method. Using the T16A14V alloy high strength and corrosion resistance, combining the biocompatibility of the hydroxylapatite (HA) to make a biomedical implant material can satisfy the human body needs.The micron grade Ti6A14V alloy powder particles and nano-scale hydroxylapatite (HA) powder particle mixing grinding 30 min, the hydroxyl-apatite powder evenly coated on the surface of Ti6A14V alloy. Use mixture powder particles into the mold, the discharge plasma sintering (SPS) equipment for sintering.The scanning electronic microscope (SEM), X-ray diffraction (XRD) and energy spectrum analysis (SMD) method were used to test the samples. We can see that hydroxyl-apatite wrapped around the Ti6A14V alloy, evenly to form spatial reticulated structure, dividing the Ti6A14V alloy. On the one hand, this structure blocked the connection between the Ti6A14V alloy, hindered its growth; On the other hand, the existence of nano-sized particles also promoted the sintering, lowered sintering temperature. Network of hydroxyl-apatite (HA) is helpful for biological tissue along its growth, and promote the combination of biological tissue and the implants.Sintered samples were respectively proceeded the detection of density, hardness, compression strength and the analysis of the electrochemical properties. The results show that under the condition of the experiment used, performance indicators can be a good sample. On the premise of fixed other experimental conditions, samples of various performance indicators are increased with the sintering temperature and improve, and decreased with the increase of heating rate. In all six group contrast experiment, the sintering pressure 500 MPa, sintering temperature of 750℃,100℃ heating rate/min, the holding time of 3 min can be obtained under the condition of the best mechanics performance index. Density can reach 98.8%, hydroxyapatite phase 495.31 Hv hardness, yield strength is 1271.96 MPa, the compressive strength of 1238.22 MPa, the elastic modulus of 28.20 GPa. These indicators can reach the standard required for medical implants.