纯钛离子氮化层在人工唾液中的耐蚀性

用浸泡法和电化学法研究了纯钛(TA2)基体材料及其离子氮化层在人工唾液中的腐蚀行为.浸泡法研究表明,试样随着浸泡时间的延长而增重,而离子氮化层增重明显减缓,其腐蚀速率远小于TA2基材;电化学法研究表明,离子氮化层的自腐蚀电位较TA2基材提高,而腐蚀电流密度和腐蚀速度减小.由失重法和电化学法得出一致结论,离子氮化处理提高了TA2在人工唾液中的耐蚀性.     

加辅助阴极钛板的离子渗氮工艺参数对TC4合金渗层厚度的影响

在辉光离子气体技术的基础上加上辅助阴极钛板,对TC4合金基材进行渗氮处理。通过选择典型的基体温度、保温时间和气体介质,设计了一组正交试验,并以渗层厚度为依据分析了渗氮工艺中基体温度、保温时间和气体介质对渗层厚度的影响。同时采用Axiovert 25CA（Zeiss）光学图像分析仪和GDA750辉光光谱分析仪观察了优化工艺条件下改性层的显微组织及元素分布。结果表明,在辉光离子渗氮工艺中基体温度对TC4合金渗层厚度影响最大,在最优工艺条件下渗氮改性层的形成能显著提高基材表面硬度。     

Corrosion resistance of Molybdenum Nitride modified Ti6Al4V alloy in HCl solution

The Mo-N surface modified layer on Ti6Al4V alloy was obtained by the plasma surface alloying technique. The structure and composition of the Mo-N modified Ti6Al4V alloy were investigated by X-ray diffraction （XRD） and glow discharge optical emission spectroscopy （GDOES）. The Mo-N modified layer contains Mo-N coating on subsurface and diffusion layers between the subsurface and substrate. The X- ray diffraction analysis of the Mo-N modified Ti6Al4V alloy reveals that the outmost surface of the Mo-N modified Ti6Al4V alloy is composed of phase Mo2N （fcc） and Mo2N （tetr）. The electrochemical corrosion performance of the Mo-N modified Ti6Al4V alloy in 0.5 mol/L HCl solution was investigated and compared with that of Ti6Al4V alloy. The chemical corrosion performance of the Mo-N modified Ti6Al4V alloy in boiling 37% HCl solution was investigated and compared with that of Ti6Al4V alloy. Results indicate that self-corroding electric potentials and corrosion-rate of the Mo-N modified Ti6Al4V alloy are higher than that of Ti6Al4V alloy in 0.5 mol/L HCl solution. The corrosion-rate of the Mo-N modified Ti6Al4V alloy is lower than that of Ti6Al4V alloy in boiling 37% HCl solution.     

硫对Inconel718高温合金组织性能的影响

对不同硫含量的４炉Ｉｎｃｏｎｅｌ７１８合金进行力学性能测试及显微组织分析结果表明，硫具有严重的危害作用，表现在试样最终热处理后的６５０℃持久寿命和塑性的恶化和６５０℃高温拉伸塑性的降低。     

空心阴极烧结粉末冶金制品工艺研究

为了克服常现粉末冶金制品烧结工艺的缺点，试验研究了空心阴极等离子烧结工艺。介绍了空心阴极烧结装置、烧结方法、空心阴极功率输出特性和应用实例。     

表面冶金高速钢组织的研究

研究了20钢经辉光离子W-Mo共渗,再经渗碳后,形成的表面冶金高速钢组织,并测试了淬火、回火后的硬度及红硬性,结果表明,此种表面冶金高速钢无碳化物偏析,其硬度及红硬性基本达到M2高速钢水平。     

Plasma boronizing of Ti6AlV4 using solid precursors by double glow plasma alloying technique

Solid state B-offerings （FeB compound） were used for plasma-assisted boronizing on Ti6Al4V alloy by double glow discharge plasma alloying technique （DGPSA）. During all experiment processing there was no harmful and toxic. The thickness and morphology, phase formation, elements concentrations and wear properties of boride layers were examined by means of optical microscopy, Vickers microhardness, X-ray diffraction, glow discharge optical emission spectroscopy and Ball-disk wear tests. The results show that friction coefficient of boride alloying samples versus cortmdum ball is lower than that of Ti6Al4V samples, as well as wear rate. This indicates that plasma-assisted boronizing of Ti6Al4V alloy has a high potential for industrial applications under tribological conditions.     

无氢等离子氮化纯钛降低细菌黏附的研究

纯钛在双层辉光放电等离子体条件下进行无氢氮化处理，表面得到一层均匀、致密的改性层。经过改性层的显微组织观察，硬度测量，元素分布情况测定，X射线衍射分析改性层结构，处理前、后表面细菌黏附等的分析和表征，发现纯钛表面经等离子氮化得到的氮化膜层最外层中包括Ti2N及TiN的2种氮化物，近表面过渡层是氮在a—Ti中的固溶体。与改性前相比，等离子氮化处理的纯钛表面能显著地降低细菌黏附。     

等离子复合处理制备光催化性能TiO_2薄膜

利用离子渗镀和真空热氧化复合处理技术,在不锈钢表面制备成分结构可控的TiO2薄膜.借助图像分析仪、辉光放电光谱分析仪(GDOES)和X射线衍射仪对薄膜进行表征与分析.以苯酚废水为对象进行了光催化降解试验,对比研究了不锈钢基材TiO2薄膜与商品TiO2粉末的光催化活性.结果表明:在400～600℃工艺温度范围,不锈钢表面均形成了致密、均匀的锐钛矿型TiO2薄膜,且Ti、O元素呈梯度分布;TiO2薄膜具有较高的光催化活性,3h内降解率达74.5%.     

Structure and corrosion behaviours of Mo modified titanium in saliva

The Mo surface modified layer on titanium was obtained by the plasma surface alloying technique. The structure and composition of the Mo modified titanium were investigated by X-ray diffraction (XRD) and glow discharge optical emission spectroscopy (GDOES). The Mo modified layer contains Mo coating on subsurface and diffusion layers between the subsurface and substrate. The X- ray diffraction analysis of the Mo modified titanium reveals that the outmost surface of the Mo modified titanium is composed of pure Mo. The electrochemical corrosion performance of the Mo modified titanium in saliva was investigated and compared with that of titanium. The chemical corrosion performance of the Mo modified titanium in 37 °C saliva was investigated and compared with that of titanium. The experimental results indicated that self-corroding electric potentials and corrosion-rate of the Mo modified titanium were higher than that of titanium in saliva. Corrosion-rate of the Mo modified titanium was lower than that of titanium in 37 °C saliva.