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采用尿素溶液对一种低模量近?型钛合金(Ti-25Nb-3Zr-2Sn-3Mo,或TLM合金)进行不同温度的水热处理。采用SEM、XRD、XPS、压入法和接触角测试分析了TLM合金处理后的表面结构、化学成分、附着性和亲水性。在105和120℃水热处理后,合金表面形成了钛酸铵的纳米片薄膜;而150℃水热处理后形成了纳米颗粒薄膜,由锐钛矿TiO2和Nb2O5组成。随后的400℃退火热处理使铵盐分解和二氧化钛结晶。生成的氧化物薄膜具有良好的附着性。复合处理增强了TLM合金的亲水性,这有利于改善其生物相容性。
A urea solution was used to hydrothermally treat a low modulus near-type titanium alloy (Ti-25Nb-3Zr-2Sn-3Mo, or TLM alloy) at different temperatures. The surface structure, chemical composition, adhesion and hydrophilicity of TLM alloy were analyzed by SEM, XRD, XPS, press-in method and contact angle test. After hydrothermal treatment at 105 and 120 ℃, the nanosheet films of ammonium titanate were formed on the surface of the alloy. After hydrothermal treatment at 150 ℃, nanoparticle films were formed, which consisted of anatase TiO2 and Nb2O5. Subsequent 400 ° C annealing heat treatment decomposes the ammonium salt and crystallizes the titania. The resulting oxide film has good adhesion. The composite treatment enhances the hydrophilicity of the TLM alloy, which is beneficial to improve its biocompatibility.