本文關(guān)鍵詞： 鎳鈦形狀記憶合金 表面改性 高溫氧化 聚合物涂層 附著力　出處：《西安理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：鎳鈦形狀記憶合金(NiTi SMA)是一種具有形狀記憶效應(yīng)和超彈性的新型功能材料,同時(shí)因其具備良好的耐腐蝕性和生物相容性,在生物醫(yī)用領(lǐng)域得以廣泛應(yīng)用。為了避免直接使用時(shí)可能出現(xiàn)的生物不相容性和細(xì)胞毒性,采用表面改性技術(shù)對鎳鈦形狀記憶合金進(jìn)行表面改性處理,在減少鎳(Ni)離子析出的同時(shí),使其具備比基體更優(yōu)良的生物相容性、抗腐蝕性和耐磨性等特殊性能。本研究首先采用表面氧化的方法,在合金表面形成一層氧化層。通過對比化學(xué)氧化和高溫氧化兩種表面氧化方法的氧化效果,選擇了表面氧化層氧含量較高的高溫氧化處理工藝。最后,經(jīng)硅烷偶聯(lián)劑處理后,采用噴涂的方法在合金表面制備一層環(huán)氧樹脂/聚四氟乙烯(EP/PTFE)聚合物涂層。復(fù)合環(huán)氧樹脂和聚四氟乙烯,既保證了涂層的附著力,同時(shí)又改善了涂層表面的耐磨擦力等各方面力學(xué)性能。使用空氣壓縮機(jī)連接的高霧化氣動(dòng)噴漆槍進(jìn)行噴涂,噴涂厚度可達(dá)到幾微米,大大的降低了涂層的厚度。在本研究中,分析研究了表面的化學(xué)成分、形貌、粗糙度和氧化層厚度對鎳鈦形狀記憶合金基材和涂層之間的附著力的影響。經(jīng)硅烷偶聯(lián)劑處理的鎳鈦形狀記憶合金附著力明顯高于未經(jīng)處理的鎳鈦形狀記憶合金。當(dāng)加熱溫度的范圍為300—700℃時(shí),經(jīng)600℃高溫氧化處理過的樣品的附著力最高。與此同時(shí),在所有樣品中,600℃恒溫氧化30分鐘的鎳鈦形狀記憶合金具有最高的附著力。最后,研究分析得出,較高的附著力是由高的表面氧含量,均勻的表面形貌,合適的粗糙度和氧化層厚度決定的。
[Abstract]:Ni-Ti shape memory alloy (Niti SMA) is a new functional material with shape memory effect and superelasticity, and has good corrosion resistance and biocompatibility. In order to avoid the possible biocompatibility and cytotoxicity in direct use, the surface modification of Ni-Ti shape memory alloy was carried out by surface modification. In order to reduce the precipitation of Ni ~ (2 +) ions and make it have better biocompatibility, corrosion resistance and wear resistance than the matrix, this study firstly adopts the method of surface oxidation. A layer of oxidation layer was formed on the surface of the alloy. By comparing the oxidation effect of chemical oxidation and high temperature oxidation, a high temperature oxidation process with high oxygen content was selected. Finally, after silane coupling agent treatment, A coating of epoxy resin / polytetrafluoroethylene (EP / PTFEE) polymer coating was prepared on the alloy surface by spraying method. The adhesive force of the coating was ensured by composite epoxy resin and polytetrafluoroethylene (PTFE). At the same time, the friction resistance of the coating surface is improved. The spray thickness can reach several microns with the high atomization pneumatic spray gun connected by the air compressor, which greatly reduces the coating thickness. The chemical composition and morphology of the surface were analyzed and studied. Effect of roughness and oxide layer thickness on adhesion between substrate and coating of Ni-Ti shape memory alloy. Adhesion of Ni-Ti shape memory alloy treated by silane coupling agent is significantly higher than that of untreated Ni-Ti shape memory alloy. When the heating temperature ranges from 300 鈩，

本文編號(hào)：1546280