本文關(guān)鍵詞： D打印 選擇性激光熔化 電子束熔化 多孔鈦支架　出處：《醫(yī)用生物力學(xué)》2017年03期 　論文類型：期刊論文

【摘要】：目的研究3D打印技術(shù)制造的鉆石分子結(jié)構(gòu)多孔鈦支架的微觀孔隙結(jié)構(gòu)和力學(xué)性能,指導(dǎo)3D打印多孔鈦骨科植入物的開發(fā)。方法采用選擇性激光熔化(selective laser melting,SLM)和電子束熔化(electron beam melting,EBM)兩種金屬3D打印制造工藝,制造鉆石分子結(jié)構(gòu)多孔Ti6Al4V支架。使用光學(xué)顯微鏡和掃描電鏡觀察其微觀孔隙結(jié)構(gòu),并使用萬能材料試驗機(jī)對這些支架進(jìn)行壓縮測試。結(jié)果兩種3D打印制造工藝都會存在加工誤差,并且在表面存在半熔融金屬顆粒。SLM工藝相對誤差為20.9%~35.8%。EBM工藝相對誤差為-9.1%~46.8%,且制造不出桿件寬度為0.2 mm的支架。SLM工藝制造的支架抗壓強度為99.7~192.6 MPa,彈性模量為2.43~4.23 GPa。EBM工藝制造的支架抗壓強度為39.5~96.9 MPa,彈性模量為1.44~2.83 GPa。結(jié)論 SLM工藝比EBM工藝制造精度高。支架的孔隙率是影響其抗壓強度和彈性模量的主要因素,相同工藝的情況下,孔隙率越大,抗壓強度越小,彈性模量也越小;相近孔隙率的情況下,SLM工藝比EBM工藝強度高,彈性模量也高。
[Abstract]:Objective to study the microstructure and mechanical properties of porous titanium scaffolds with diamond molecular structure fabricated by 3D printing technology. To guide the development of 3D printed porous titanium orthopedic implants. Methods selective laser melt selective laser melting was used. SLM) and Electron beam melting EBM (electron beam melting) are two metal 3D printing manufacturing processes. The porous Ti6Al4V scaffold with diamond molecular structure was fabricated. The microscopic pore structure of the scaffold was observed by optical microscope and scanning electron microscope. The compression test of these scaffolds was carried out with a universal material testing machine. As a result, there were machining errors in both 3D printing and manufacturing processes. And the relative error of semi-molten metal particle. SLM process is 20.9and 35.8. EBM process relative error is -9.1and 46.8%. The compressive strength of the scaffold made by SLM process is 99.7m ~ 192.6 MPa. The compressive strength of the scaffold fabricated by the elastic modulus of 2.43 ~ 4.23 GPa.EBM is 39.5 MPa. The elastic modulus is 1.44 ~ 2.83 GPa.Conclusion the SLM process is more accurate than the EBM process, and the porosity of the scaffold is the main factor affecting its compressive strength and elastic modulus. Under the same process, the larger the porosity, the smaller the compressive strength and the smaller the elastic modulus. Under the condition of similar porosity, the strength and elastic modulus of EBM process are higher than that of EBM process.
【作者單位】： 上海交通大學(xué)機(jī)械與動力工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51475293)
【分類號】：R318.01;R687
【正文快照】： 在目前使用的生物醫(yī)用金屬材料中,鈦合金具有優(yōu)良的生物相容性和力學(xué)性能,在醫(yī)學(xué)上被廣泛地用于骨外科和牙科的植入物材料。但是鈦合金的彈性模量和人體骨組織的彈性模量不匹配,會產(chǎn)生應(yīng)力遮擋,導(dǎo)致人體骨組織的萎縮,造成植入失敗。將鈦合金制造成多孔結(jié)構(gòu),可以使得多孔鈦合金

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