A kind of graphene-reinforced titanium-based/nanometer HA composite material and preparation method thereof
A composite material and graphene technology, applied in prosthetics, medical science, etc., can solve problems such as stress shielding, densification difficulties, severe interface reactions, etc., and achieve the effect of optimizing performance, improving biological performance or mechanical properties, and simple process
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Embodiment 1
[0080] Prepare modified graphene
[0081] 0.25 g of graphene was added to 100 ml of 0.02 μg / mL rutin aqueous solution, and ultrasonically dispersed for 30 min. After standing for 24 hours, filter, remove the filter residue and vacuum dry at 60° C. for 2 hours to obtain surface-modified graphene (modified graphene). Graphene without surface modification is in the form of flocs or bundles in water, and its dispersibility is poor; the surface of modified graphene is smooth, and its dispersibility in water is good, showing a highly dispersed state.
[0082] Mixture
[0083] Weigh and prepare Ti-29.2Nb-12.2Ta-4.3Zr (wt%) alloy powder raw material according to the design ratio and put it into a ball mill jar, use a particle ball mill to carry out mechanical ball milling, the ball milling speed is 350r / min, the medium is tert-butanol, and ball milling The duration is 5h. When the ball milling reaches the 3rd hour, add the lanthanum powder and the above-mentioned modified graphene ...
Embodiment 2
[0092] Sintering
[0093]Weigh the mixed powder prepared in Example 1, put it into a cylindrical graphite mold with the bottom surface and the inner wall close to the graphite paper, make the mixed powder fill the middle cylinder, and the side of the graphite paper contacting the powder is coated with nitrogen Boron. Put the assembled mold with powder into the sintering furnace, and sinter according to the designed sintering process. The sintering temperature in the vacuum hot pressing sintering process is 1000°C. During the sintering process, the furnace temperature was raised from room temperature to 800°C at a rate of 10°C / min. Then, heat up to the sintering temperature at a rate of 8°C / min, keep the temperature for 2 hours, pressurize at 25Mpa during the heat preservation, and keep the pressure for 1 hour. Allow to cool in the furnace, then remove the pressure. Afterwards, the sintered bulk cylinder sample was cut by wire cutting method to obtain samples of different...
Embodiment 3
[0114] Referring to the process of mixing materials and sintering sample preparation in Example 1-2, according to the following raw material ratios in parts by weight: 3-15% of hydroxyapatite HA, 0.1% of lanthanum, 1.0% of modified graphene, and the balance of titanium alloy , a total of 100%, processed to prepare composite materials. Using the modified graphene prepared in Example 1, the titanium alloy raw material is the same as in Example 1, and the only change in the sample is the content of HA (3%, 5%, 8%, 10%, 15%).
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