Performance controllable silicon nitride ceramic implant and preparation method thereof

Abstract

The invention relates to a performance controllable silicon nitride ceramic implant and a preparation method of the implant. The implant comprises silicon nitride and additives, wherein the additivescomprise a first additive, a second additive and a third additive; the first additive is one or a mixture of more than one of magnesium oxide, aluminum oxide, yttrium oxide, strontium oxide, cerium oxide, chromic oxide, titanium carbide, titanium nitride and boron nitride; the second additive is one or a mixture of more than one of erbium oxide, thulium oxide, ytterbium oxide and lutetium oxide; and the third additive is one or a mixture of more than one of praseodymium oxide, samarium oxide, cerium dioxide, neodymium sesquioxide and calcium titanate. An outer layer of the implant mainly comprises alpha phase silicon nitride; the interior of the implant mainly comprises beta phase silicon nitride, so that the implant achieves an effect of the hard surface and the tenacious interior; the hardness and wear resistance as well as fracture toughness and strength of the implant can be improved; cracks are resisted; and corresponding damage risks are reduced.

Description

technical field [0001] The invention relates to the technical field of biomedical implants, in particular to a performance-controllable silicon nitride ceramic implant and a preparation method thereof. Background technique [0002] Although artificial joint replacement is one of the most successful surgical procedures, several issues related to prosthetic materials remain unresolved. According to data from the 2018 annual report of the American Joint Replacement Registry, the reasons for more than 70% of revision surgery are osteolysis, wear, infection, aseptic loosening and dislocation. Among the above-mentioned reasons for revision, the articular surface material used in the prosthesis and the quantity, size and biological effect of the wear particles play a decisive role. [0003] The incidence of metal hypersensitivity and anaphylaxis is increasing in industrialized countries worldwide. The possibility of metal hypersensitivity in patients receiving metal-on-metal pros...

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Problems solved by technology

Whether it is toughened by phase change or plate crystal toughened powder pottery, the toughness is improved by adding impurities, especially the addition of 10% to 30% zirconia has aging problems, and aging generally starts from the surface , gradually develops to the inside, and the aging is more serious in a humid environment. In the complex physiological environment of the human body, how will its performance change? It is still uncertain whether it is a time bomb in the body

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