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摘要钛及钛合金不仅拥有着强度高、耐蚀性好、生物相容性好等诸多优点，被广泛应用在航空航天、化工、汽车、医用等各个方面。但是硬度低、耐磨性差。因此需要对钛及钛合金进行表面改性。本文以Ti-6Al-4V为基体，在其表面制备一层含Ca-P的复合膜层。控制占空比为60%，频率为2000HZ，通过改变电解液的组成成分、脉冲电压的大小、处理时长的长短来探讨其对复合膜层的组织和性能的影响。处理后的试样表面生成了Ca（H2PO4）2和CaHPO4等钙磷盐新物相。研究结果表明，以硝酸钙和磷酸钠为电解液溶质，增大脉冲电压延长处理时间等都会使含Ca-P的复合膜层孔洞的孔径增大，数量减少，厚度增加，表面粗糙度增加。最终得出当脉冲电压为300V，处理时间为20min，占空比为60%，频率为2000HZ时，得到的复合膜层的耐蚀性最佳。30767
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关键词 钛及钛合金 阴极液相等离子体 Ca-P复合膜层 耐蚀性
毕业论文设计说明书外文摘要
Title Microstructure and properties of composite ceramic coating containing Ca-P on Titanium alloy fabricated by cathodic plasma electrolytic technology Abstract
Titanium and titanium alloy has a high strength, good corrosion resistance, good biocompatibility, and many other advantages. It is widely used in aerospace, chemical, automotive, medical and other aspects. But its shortcomings are obvious, such as low hardness and poor wear resistance. So for titanium and titanium alloy, performance improvement is imminent. In this paper, composite coating containing Ca-P was fabricated by plasma electrolytic technology on TC4. The effects of electrolytic solutions, pulse voltages, and treat time on the microstructure and performances were studied by X-ray diffraction, scanning electronic microscope, energy dispersive spectrometer and corrosion resistance test.New phases like Ca(H2PO4)2 and CaHPO4 occur on tne earth of the sample which has been disposed already. Results show that the morphology characteristic of the coating is porous, and its radius increases with the increment of the working voltage and time. The best corrosion resistance of sample could be obtained when the working voltage is 300V and treat time is 20 min in solution consisted of calcium nitrate and sodium phosphate.
Keywords Titanium and titanium alloy cathodic plasma electrolytic composite coating containing Ca-P corrosion resistance
目 次
1 绪论1
1.1 钛及钛合金 1
1.1.1钛及钛合金的概述 1
1.1.2钛合金分类 1
1.1.3钛合金应用 2
1.2钛合金表面处理技术 2
1.2.1电镀、电刷镀及电沉积法 3
1.2.2表面氧化处理 3
1.2.3表面化学处理 3
1.2.4激光表面处理 3
1.2.5离子注入及薄膜技术 4
1.3 本课题研究内容 4
1.3.1钛合金表面含Ca-P复合膜层概述 4
1.3.2钛合金表面含Ca-P复合膜层的性能特点及其应用前景4
1.3.3影响钛合金表面含Ca-P复合膜层的因素4
2实验原理及方法6
2.1 液相等离子体电解现象及其原理6
2.1.1液相等离子体电解技术6
2.1.2液相阴极等离子体电解渗技术应用前景展望7
2.1.3液相等离子体现象及其原理7
2.2工艺条件8
2.2.1样品及实验仪器8
2.2.2电解液的构成及制备9
2.2.3工艺条件9
3实验结果和讨论10
3.1脉冲电压对表面改性层的影响10
3.2处理时长对表面改性层的影响16
3.3电解液配方成分对表面改性层的影响21