Technology method for improving surface abrasion resistance of laser additive manufacturing metal artificial knee joint

Abstract

The invention discloses a technology method for improving surface abrasion resistance of a laser additive manufacturing metal artificial knee joint, and belongs to the technical field of surface treatment. The technology method comprises the following steps that firstly, sand blasting treatment is conducted, sand blasting treatment is conducted on the surface of the artificial knee joint, and thesurface roughness reaches Ra3.2; secondly, preheating treatment is conducted, the artificial knee joint is heated to 40-50 DEG C, and nanometer zirconia powder is sprayed and heated to 40-50 DEG C; and thirdly, spraying is conducted, and zirconia ceramic powder is used for conducting plasma spraying on the sprayed surface. Nanometer zirconia particles are sprayed to the surface of the artificial knee joint, and inherent defects that a traditional knee joint is low in abrasion resistance, and full ceramic joint toughness is poor are overcome. A layer structure with anisotropism is formed on theceramic surface obtained after plasma spraying, the ceramic layer brittle fracture tendency can be greatly reduced through the structure, the structure and other structures are well matched after spraying, inherent forming and moving states of the knee joint cannot be influenced, the service life of the artificial knee joint is prolonged, and the pain of patients is reduced.

Description

technical field [0001] The invention discloses a process method for improving the wear resistance of the surface of a metal artificial knee joint manufactured by laser additive manufacturing, and belongs to the technical field of surface treatment. Background technique [0002] As a bioalloy, cobalt-chromium-molybdenum alloy has the advantages of excellent wear resistance and corrosion resistance, high fatigue strength and good biocompatibility, but the traditional process is difficult to process and prepare complex structures. The patient's individual customization needs, and the additive manufacturing technology can quickly and precisely manufacture parts of any complex shape, which solves the difficulties in the processing and preparation of biological CoCrMo, but this does not mean that all problems are solved. Artificial knee joints The working environment of the knee joint is complex, and under the combined effects of body fluid corrosion, temperature changes in the hu...

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Problems solved by technology

[0002] As a bioalloy, cobalt-chromium-molybdenum alloy has the advantages of excellent wear resistance and corrosion resistance, high fatigue strength and good biocompatibility, but the traditional process is difficult to process and prepare complex structures. The patient's individual customization needs, and the additive manufacturing technology can quickly and precisely manufacture parts of any complex shape, which solves the difficulties in the processing and preparation of biological CoCrMo, but this does not mean that all problems are solved. Artificial knee joints The working environment is complex. Under the joint action of body fluid corrosion, temperature changes in the human body, and cell growth, the wear performance of the knee joint decreases, the pain of the patient increases, and the service life decreases.

[0003] Articular surface wear products are toxic to the human body and will cause adverse physiological tissue reactions, and after the alloy undergoes ion precipitation in the human body fluid environment, the precipitated free Co and Cr plasma may form carcinogens after accumulating a certain amount

However, ceramic joints, which are promising in the future, are difficult to process and costly due to the high hardness and poor toughness of the material, and more importantly, the difficulty in personalized modeling. Therefore, large-scale clinical applications face severe challenges.

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