(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. 中南大學(xué) 湘雅口腔醫(yī)院，長沙 410078；
3. 中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 金剛石薄膜可以加強牙科用鈦合金(TC4)基臺止動螺釘穩(wěn)定性，延長其使用壽命。通過熱絲輔助化學(xué)氣相沉積(HFCVD)在TC4上沉積微米晶金剛石(MCD)和納米金剛石(NCD)薄膜，分別采用SEM、AFM和Raman光譜對金剛石薄膜的形貌和質(zhì)量進(jìn)行表征，采用劃痕實驗檢測了薄膜的結(jié)合強度。結(jié)果表明：沉積得到的NCD和MCD薄膜連續(xù)致密，表面粗糙度小，結(jié)合良好；金剛石薄膜有效地降低了TC4表面的摩擦因數(shù)和磨損率，NCD的摩擦因數(shù)約為0.09~0.15，MCD的約為0.18~0.22，其中在人工唾液環(huán)境下表現(xiàn)出更低的摩擦因數(shù)；金剛石薄膜人工唾液環(huán)境中能有效地提升材料的耐腐蝕性能，TC4表面沉積所得NCD薄膜的各項性能指標(biāo)均優(yōu)于MCD薄膜的。
關(guān)鍵字: 金剛石薄膜；鈦合金；結(jié)合強度；摩擦學(xué)性能；耐腐蝕性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Xiangya Stomatological Hospital, Central South University, Changsha 410078, China;
3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The diamond coatings may strengthen the stability of the titanium abutment screw in dentistry for improving its lifespan. The nanocrystalline diamond (NCD) and microcrystalline diamond (MCD) films were deposited on titanium alloy (TC4) by hot-？lament-assisted chemical vapor deposition (HFCVD). The morphology and quality of the diamond films were evaluated by SEM, AFM and Raman spectroscopy, respectively. The adhesive strength between the film and substrate was characterized by scratch test. The results show that as-deposited NCD and MCD films have continuous, dense, small surface roughness and good adhesion. The friction experiments indicate that diamond coating lowers the friction coefficient and friction rate. The friction coefficient of NCD and MCD are about 0.09-0.15 and 0.18-0.22, wherein, the artificial saliva exhibit even lower. MCD coating also promotes the corrosion resistance in artificial saliva. All the results present that TC4 surface deposited with NCD film provides superior performances than MCD film.
Key words: diamond film; titanium alloy; adhesive strength; tribological behavior; corrosion resistance
