Enhancing porous tantalum implant selective laser preparation method and implant

Abstract

The invention discloses an enhancing porous tantalum implant selective laser preparation method and an implant. The enhancing porous tantalum implant selective laser preparation method comprises the following steps: during the selective laser smelting and forming process, melting spherical tantalum powder under laser radiation, enabling hydride of nano tantalum to decompose hydrogen due to high temperature, and enabling hydrogen to blast and overflow under the action of high temperature and high pressure to form a first-stage porous structure on the surface of formed tantalum; due to a gap existing between an SLM forming melting track and a melting track, forming an included angle of 30-90 degrees between a current-layer melting track and a next-layer melting track to form a second-stage porous structure; and melting and solidifying spherical tantalum powder to form a third-stage porous structure and a fourth-stage porous structure customized by CAD design software. The four stages ofporous structures form cross-stage nanoscale, micro-nanoscale, micrometer scale, millimeter scale and multiple cross-scale macro and microcosmic integrated multi-stage porous tantalum implant. According to the enhancing porous tantalum implant selective laser preparation method, decomposed hydrogen blasts and overflows to generate an enhancing structure to expand the extreme and tiny capacity of SLM forming and enhance the capacity for forming porous tantalum through selective laser melting.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a method for preparing an enhanced porous tantalum implant by laser selection and the implant. Background technique [0002] Laser selective melting technology is already a widely used and mature metal additive manufacturing technology. This technology uses laser as the heat source, focuses the laser beam on the metal powder on the forming plane through the control of the precise optical scanning system, and moves the laser focus at high speed according to the predetermined path, so that the scanned metal powder on the forming plane melts rapidly Afterwards, it is rapidly cooled and solidified, and the three-dimensional solid metal structure is finally processed by scanning the cross-sectional area layer by layer and superimposing the molding method layer by layer. In principle, the laser selective fusion molding technology breaks through the limitatio...

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Problems solved by technology

[0004] The main purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, to enhance the preparation method of porous tantalum implants by laser selection and implants, and to solve the problem that laser selective melting cannot form microstructures below 100 microns to match real bone trabecular structures , and the problem that the oxygen content of the powder will increase during long-term use

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