Surface modification of dental alloy by electron-beam system.

1.对铸态钛表面性能的影响在我们的表面粗糙度和光泽度测量报告中，纯钛和Ti-6Al-7Nb经过EB辐照后，表面粗糙度明显降低。研究了EB辐照对纯钛和Ti-6Al-7Nb合金耐蚀性能、表面晶型结构和硬度的影响。为了评估耐蚀性，在0.9%NaCl溶液中使用恒电位器（标准伏安测量工具HSV-100 HOKUTO DENKO）以0.5mV/s的速度扫描-500mV至2V，进行阳极极化测量。测定并比较了+1000mV vs SCE时的无源电流密度（I_<通过>）。纯钛和Ti-6Al-7Nb合金经EB辐照后的I_<pass>值小于手工抛光后的I_<pass>值。分析了辐照前后的x射线衍射图。辐照后，Ti-6Al-7Nb合金α峰半值宽度显著增大。另一方面，纯钛经EB辐照后表面硬度降低。对Au-Ag-Pd合金表面性能的影响。采用铸造法制备了Au-Ag-Pd合金试样。用铝喷砂后进行EB辐照。陨石坑是在地表形成的。我们把氧化铝砂换成了玻璃珠。所以，表面是光滑的。并对辐照前后的x射线衍射图进行了分析。EB辐照后出现宽峰。（2 θ=52°）峰呈非晶态。结果表明，在EB辐照下，表面发生轻微聚变

1.Effect on the surface properties of cast TitaniumIn our reports on the surface roughness and glossiness measurement, the surface roughness was significantly decreased after EB irradiation in pure titanium and Ti-6Al-7Nb. In this study we examined the effect of EB irradiation on the properties of corrosion resistance, surface crystalline structure and hardness on pure titanium and Ti-6Al-7Nb alloy. To estimate corrosion resistance, anodic polarization measurement was performed in 0.9%NaCl solution using a potentiostat (standard voltammetry tool HSV-100 HOKUTO DENKO) scanning from -500mV to 2V at a rate of 0.5mV/s. Passive current densities (I_<pass>) at +1000mV vs SCE were determined and compared. In the pure titanium and the Ti-6Al-7Nb alloys, the I_<pass> values after EB irradiation was smaller than those of polished by handwork. X-ray diffraction patterns of before and after EB irradiation were analyzed. After irradiation, half value width of alpha peak of Ti-6Al-7Nb alloy significantly increased. On the other hand, surface hardness after EB irradiation decreased in the pure titanium.2.Effect on the surface properties of Au-Ag-Pd alloy. Specimens of Au-Ag-Pd alloy were made by casting. EB irradiated those specimens after sand blasting with alumina. The crater was generated on the surface. We changed alumina sand to glass beads. So, the surface is smooth. In addition, X-ray diffraction patterns of before and after EB irradiation were analyzed. After EB irradiation, the broad peak appeared. (2 θ=52°) This peak is like to amorphous. They will suggest slight surface fusion by EB irradiation