Lithium silicon compound enhanced bioactive ceramic material and preparation method thereof
A technology of bioactive ceramics and silicon compounds, which is applied in tissue regeneration, pharmaceutical formulations, dental preparations, etc., can solve the problems that the preparation methods are difficult to obtain mechanical properties and bioactivity, and achieve excellent bioactivity and degradation performance. Effect of low porosity and low sintering temperature
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[0036] In a first aspect, the present invention provides a method for preparing a lithium-silicon compound enhanced bioactive ceramic material, the method comprising the following steps:
[0037] (1) Mix lithium-silicon compound, bioactive ceramic powder and binder uniformly to obtain a mixture, and then shape the mixture to obtain a ceramic body; the bioactive ceramic powder is preferably silicon calcium phosphate Powder;
[0038] (2) Sintering the ceramic green body obtained in step (1) at 500-1300° C. (normal pressure sintering) to obtain a lithium-silicon compound-enhanced bioactive ceramic material.
[0039] Although lithium-silicon compounds (such as lithium disilicate) and bioactive ceramic materials (such as silicon calcium phosphate) are potential biological and medical materials. However, usually as a dental restoration material, lithium disilicate needs to have high strength and non-degradable characteristics, while an ideal bioactive ceramic should have good mecha...
Embodiment 1
[0066] First weigh 2.5g lithium disilicate Li 2 Si 2 o 5 Whiskers and 47.5g silicon calcium phosphate powder, add 50g deionized water, add 5.0g concentration and be 10wt% polyvinyl alcohol aqueous solution (bonding agent), roller ball milling 3h, make the mixture of uniform dispersion, then in 60 Dry at ℃ for 12 hours, sieve to obtain a mixture with uniform particle size; then carry out dry pressing (dry pressing molding pressure 50MPa, holding time 5min) and cold isostatic pressing (cold isostatic molding) of the obtained mixture successively. Press molding pressure 200MPa, holding time 5min) to obtain a test strip with a length, width, and height of 3mm×4mm×40mm; finally, place the test strip on an alumina crucible cover for normal pressure sintering at 2°C / min The heating rate is raised to 500°C and kept for 2 hours to remove the binder, and then the temperature is raised to 1000°C (final sintering temperature) at a heating rate of 2°C / min and kept for 2 hours to obtain l...
Embodiment 2
[0070] Embodiment 2 is basically the same as Embodiment 1, the difference is:
[0071] Lithium disilicate Li 2 Si 2 o 5 The consumption of whisker is 5g, and the consumption of silicon calcium phosphate powder is 45g,
[0072] A lithium-silicon compound-reinforced silicon calcium phosphate bioactive ceramic material with an added amount of lithium disilicate whiskers of 10 wt% was obtained; other differences are shown in Table 1.
[0073] The fracture morphology of the lithium-silicon compound reinforced bioactive ceramic material prepared in this example is as follows: Figure 4 shown.
[0074] comprehensive Figure 4 As can be seen from Table 1, with the increase in the amount of lithium disilicate whiskers added, the densification degree of the lithium-silicon compound reinforced silicon calcium phosphate bioactive ceramic material increases, the content of rod-shaped calcium silicate increases, and the flexural strength increases significantly.
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