本文選題：鈦合金 + 微弧氧化��； 參考：《沈陽理工大學(xué)》2011年碩士論文

【摘要】：鈦及鈦合金本身具有比強(qiáng)度高、生物相容性和耐蝕性優(yōu)良的性能,但其存在生物活性差、與骨結(jié)合時(shí)間長、在生理環(huán)境中向肌體游離金屬離子等問題,因而對(duì)鈦合金表面改性以完善其生物學(xué)性能引起了人們的日益重視。為了阻止鈦合金金屬離子向體液中游離、改善其生物活性和提高骨愈合速度,本文利用微弧氧化技術(shù)在鈦合金表面制備了微弧氧化陶瓷膜,并對(duì)微弧氧化陶瓷膜進(jìn)行堿處理,通過微弧氧化-堿處理復(fù)合法制備出了生物活性涂層。 研究了電解液組成、濃度和電壓對(duì)微弧氧化過程及陶瓷膜的影響。結(jié)果表明:單一成分的電解液不利于Ti-6Al-4V鈦合金微弧氧化起弧;提高溶液中離子濃度,有利于降低微弧氧化起弧電壓;不同電解質(zhì)對(duì)微弧氧化電流的影響不同,提高NaAC、CaAC濃度,電流增大,而提高Na_2SiO_3濃度,電流降低;可以通過調(diào)節(jié)電解液濃度或電壓來控制陶瓷膜的結(jié)構(gòu)及陶瓷膜表面元素含量,通過改變電解液配方來改變陶瓷膜成分。 研究了堿處理對(duì)不同成分微弧氧化陶瓷膜及其生物活性的影響。結(jié)果表明:堿處理能有效降低和消除Ti-6Al-4V鈦合金微弧氧化陶瓷膜表面的Al和V,從而避免陶瓷膜植入生物體內(nèi)后所帶來的危害;樣品經(jīng)堿液處理后具有良好的生物活性,在模擬體液(SBF)中浸泡2d即有一層羥基磷灰石(HA)膜形成,HA膜的迅速形成能防止陶瓷膜的溶解,有效阻止陶瓷膜表面對(duì)生物體有害元素的滲出;堿液理后,含鈣磷微弧氧化陶瓷膜的生物活性優(yōu)于含鈣微弧氧化陶瓷膜的生物活性。 研究了堿處理工藝(時(shí)間、溫度、濃度)對(duì)微弧氧化陶瓷生物活性的影響。結(jié)果表明:在80°C 3mol/ NaOH的溶液中處理0.5～2h所制備的生物陶瓷膜最為優(yōu)異。 探討了堿處理誘導(dǎo)微弧氧化陶瓷膜沉積HA的機(jī)理。分析表明:堿處理促使微弧氧化陶瓷膜表面生成鈦酸鈉水凝膠和羥基磷灰石是陶瓷膜具有優(yōu)良生物活性的主要原因。
[Abstract]:Titanium and titanium alloys have high specific strength, good biocompatibility and corrosion resistance, but they have some problems such as poor bioactivity, long time of binding to bone, free metal ions in physiological environment and so on.Therefore, the surface modification of titanium alloys to improve their biological properties has attracted increasing attention.In order to prevent titanium alloy metal ions from dissociating into body fluid, to improve its biological activity and to improve bone healing speed, microarc oxidation ceramic film was prepared on titanium alloy surface by micro-arc oxidation technique, and the ceramic membrane was treated with alkali.The bioactive coatings were prepared by microarc oxidation and alkali treatment.The effects of electrolyte composition, concentration and voltage on the process of micro-arc oxidation and ceramic film were studied.The results show that the single component electrolyte is unfavorable to arc starting of Ti-6Al-4V titanium alloy by micro-arc oxidation, increasing ion concentration in solution is beneficial to decrease arc starting voltage of micro-arc oxidation, the effect of different electrolytes on the arc oxidation current is different, and the concentration of NaAC-CaAC is increased.The structure of ceramic membrane and the content of elements on the surface of ceramic membrane can be controlled by adjusting the concentration or voltage of electrolyte, and the composition of ceramic membrane can be changed by changing the composition of electrolyte.The effect of alkali treatment on the microarc oxidation ceramic membrane and its biological activity was studied.The results show that alkali treatment can effectively reduce and eliminate Al and V on the surface of ceramic membrane of Ti-6Al-4V titanium alloy micro-arc oxidation, thus avoiding the harm caused by ceramic membrane implanted into organism, and the sample has good biological activity after alkali treatment.After soaking in SBF for 2 days, there was a layer of hydroxyapatite (HA) membrane formed rapidly, which could prevent the dissolution of ceramic membrane and prevent the exudation of harmful elements on the surface of ceramic membrane, and after lye treatment, the formation of HA membrane could prevent the dissolving of ceramic membrane and prevent the exudation of harmful elements on the surface of ceramic membrane.The bioactivity of the ceramic membrane containing calcium and phosphorus was better than that of the ceramic membrane containing calcium.The effects of alkali treatment (time, temperature and concentration) on the bioactivity of micro-arc oxidation ceramics were studied.The results showed that the bioceramics membrane prepared in 80 擄C 3mol/ NaOH solution for 2 h was the best.The mechanism of HA deposition on micro-arc oxidation ceramic membrane induced by alkali treatment was discussed.The results showed that alkali treatment promoted the formation of sodium titanate hydrogel and hydroxyapatite on the surface of ceramic membrane.
【學(xué)位授予單位】：沈陽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TG174.45

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