腐蝕降解行為
(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) 粉末冶金國家重點實驗室，長沙 410083；
2. 中南大學(xué) 湘雅三醫(yī)院，長沙 410013)
摘 要: 以Mg-6%Zn合金為基體、β-Ca3(PO4)2為強化相，采用粉末冶金工藝制備Mg-6%Zn-10%(β-Ca3(PO4)2)復(fù)合材料。利用光學(xué)顯微鏡觀察復(fù)合材料的顯微組織，采用X射線衍射儀分析相組成，采用壓縮試驗評估復(fù)合材料力學(xué)性能，采用動電位極化法和浸泡實驗研究復(fù)合材料在模擬體液(SBF)中的腐蝕行為。結(jié)果表明：β-Ca3(PO4)2在燒結(jié)過程中與基體合金沒有發(fā)生明顯反應(yīng)；復(fù)合材料密度為1.936 g/cm3，壓縮強度為339 MPa，彈性模量為24 GPa；添加β-Ca3(PO4)2可降低Mg-6%Zn在SBF中的腐蝕速度；Mg-6%Zn-10%(β-Ca3(PO4)2)復(fù)合材料在SBF中的電化學(xué)腐蝕速度為2.277 mm/y，浸泡30 d的浸泡腐蝕速度為2.133 mm/y，SBF的 pH值隨著浸泡時間的延長而上升，最終穩(wěn)定在10。
關(guān)鍵字: Mg-6%Zn-10%(β-Ca3(PO)4)；復(fù)合材料；腐蝕；力學(xué)性能；生物降解
Mg-6%Zn-10%(β-Ca3(PO4)2) composite
PEI Sai-min3, WANG Rui-fang3, LI Shao-jun1, HU Ya-nan1
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
3. The Third Xiangya Hospital, Central South University, Changsha 410013, China）
Abstract:Using Mg-6%Zn as the matrix and β-Ca3(PO4)2 as reinforcement, the Mg-6%Zn-10%(β-Ca3(PO4)2) bio- composite was fabricated by the powder metallurgy method. The microstructure of Mg-6%Zn-10%(β- Ca3(PO4)2) biocomposite was observed by optical microscopy and the phases were analyzed by X-ray diffractometry. The mechanical properties were evaluated by compression tests. The corrosion behavior of the bio-composite in simulated body fluid (SBF) was studied by potentiodynamic polarization and immersion tests. The results show that the reaction between β-Ca3(PO4)2 particles and Mg-6%Zn matrix during sintering is not observed. The density of the biocomposite is 1.936 g/cm3, the compression strength is 339 MPa and the elastic modulus is 24 GPa. The additive of β-Ca3(PO4)2 reduces the corrosion rate of Mg-6%Zn. The electrochemical corrosion rate of Mg-6%Zn-10%(β-Ca3(PO4)2) is 2.277 mm/y, and the calculated corrosion rate of the biocomposite immersed in SBF for 30 d is 2.133 mm/y. During the immersion test, the pH value of SBF increases gradually, and at last stabilizes at 10.
Key words: Mg-6%Zn-10%(β-Ca3(PO4)2); biocomposite; corrosion; mechanical property; biodegradation
