Abstract:Ti-35Nb-7Zr-10 Calcium pyrophosphate (CPP) composites were prepared by spark plasma sintering (SPS) technology varied from 950 ℃ to 1150 ℃. The effects of the sintering temperature on the relative density, microstructure evolution, and mechanical properties of the composites were investigated. The results showed that the composites were consisted of a β-Ti phase matrix, a little residual α-Ti phase and metal - ceramic phases (Ti2O, CaO, CaTiO3, CaZrO3 and TixPy). With the sintering temperature increasing, the residual α-Ti phase decreased, while the metal - ceramic phase gradually increased. The elastic modulus and compressive strength of composites appeared a tendency of increase with the sintering temperature rising. However, when the sintering temperature was over 1050 ℃, metal - ceramic phases rapidly increased due to the violent reaction between metal and ceramic, which led to the elastic modulus increasing drastically. Thus, when the sintering temperature were in the range of 1000 - 1050 ℃, The elastic modulus and compressive strength of composites were in the range of 42 - 45 GPa and 1240 - 1330 MPa, respectively, revealing better overall mechanical properties. At the same time, the surface of the composite after soaking in SBF for 7 days formed a dense bone-like apatite layer, which showed a good bioactivity.