In recent years, the demand for biomedical materials has grown rapidly. In 2005, the total market of biomedical materials in the world has reached 210 billion US dollars, and the total sales in China has reached 80 billion yuan, of which medical planting biomaterials account for a large proportion. Mainly used to restore the structure and function of tissues and organs. Metal and metal-based biomaterials have become the mainstream of implant materials in clinical practice due to their good mechanical properties.

However, most medical implants need to be individually designed and manufactured for individual patients, which is technically very difficult and causes problems such as high cost and long cycle. To date, the fabrication of metal implants has been carried out by forging or casting methods, and the processing process is complicated, the processing cycle is long, and the cost is high, which has become a major problem hindering its development. Compared with traditional processing methods, laser forming of biomaterials not only saves time and materials, simplifies process steps, achieves digitization, moldless end-to-end forming, but also enables individualized design and processing to meet the individual patient's personality. It has great application value in the field of biomedical material preparation.

In recent years, the research of laser stereo forming technology has gradually emerged. This technology can realize the rapid prototyping of high-performance dense metal parts with complex shapes, which provides an important way for the preparation of high-performance medical implants. Extensive attention in the field.

The so-called laser solid forming technology (LaserSolidForming, LSF), the basic principle is: first generate a three-dimensional model of the part in the computer, and then layer the slice "slice" according to a certain thickness, that is, convert the three-dimensional data information of the part into a series of two Dimension information, and then laser coating method, the laser is used to melt and solidify the powder to form a metallurgical bond, and the material is stacked layer by layer according to the contour trajectory, and finally a three-dimensional solid part blank is formed.

The laser stereo forming technology can prepare completely dense parts, and the powder is quickly cooled after being melted, and the obtained material has fine structure and no component segregation, so that the prepared medical metal parts have high mechanical properties and corrosion resistance; Appropriate atmosphere protection can keep the alloy components from being contaminated during the preparation process, thus retaining the original biological properties of the alloy.

At present, there are many units abroad, such as Washington State University, Ohio State University, University of Louisville and Aachen University in Germany, etc., which have carried out laser stereolithography to prepare titanium alloy, stainless steel spine, joint, bone and bioporous materials. the study.

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