AN ABNORMAL BEHAVIOR OF NANO-CRYSTALLINE IN SiO_2 SUBSTRATE

Temperature dependence of the hyperfine field of Fe nanocrystalline in SiO2matrix prepared by using an ion implantation and subsequent heat treatment can not be described by a formula for the isolated Fe nanocrystalline.The large stresses or chemical bond force to which interface atoms may be subjected lead to increase effective anisotropic constant. In addition a little concentration of oxygen atoms contained in the crystalline might enhance the hyperfine field.

类金刚石薄膜在模拟体液中的电化学阻抗

利用双放电腔微波等离子体源全方位离子注入设备,分别采用等离子体增强化学气相沉积技术、等离子体源离子注入和等离子体增强化学气相沉积复合技术两种工艺对医用316L不锈钢进行类金刚石薄膜表面改性。利用电化学阻抗谱法考察了两种工艺制备的类金刚石薄膜在模拟体液中的抗腐蚀性能。结果表明:与采用等离子体增强化学气相沉积技术制备的类金刚石薄膜相比,在72 h的浸泡时间内,采用等离子体源离子注入和等离子体增强化学气相沉积复合技术制备的类金刚石薄膜防腐蚀性能明显增高,腐蚀阻抗较高,碳注入层可有效抑制溶液渗入薄膜和基体之间的界面,起到了腐蚀防护层的作用。动电位极化测试表明:采用复合技术制备的类金刚石薄膜在模拟体液中的腐蚀倾向性更低,钝态稳定性更好。

^(57)Fe注入多晶氧化铝陶瓷的表面电性能和结构

本文应用 X 射线电子能谱(XPS)、穆斯堡尔谱和电学测量研究^(57)Fe 注入氧化铝陶瓷的表面电性能和结构,及其热退火的影响.结果表明,注入层的电阻率大大降低,同时,注入剂量较高和退火温度适宜可以达到改善材料的表面电导性能.注入的铁以 Fe^(3+)、Fe^(2+)和 Fe°三种价态存在.并且,经退火后这些价态的相对比例发生变化.最后,简短地讨论了样品注入层的导电机理.

NiTi合金的离子注入穆斯堡尔谱学

简要介绍了离子注入穆斯堡尔谱学的基本原理，讨论了离子注入的不同途径，及离子注入穆斯堡尔谱学的应用．

N_2^+、N^+与Cu基底中α-Fe纳米颗粒相互作用的穆斯堡尔谱研究

利用穆斯堡尔方法研究了Ｎ２＋、Ｎ＋与 Ｃｕ基底中α－Ｆｅ纳米颗粒相互碰撞和碰撞后的热动力学过程。实验结果表明，Ｎ２＋与α－Ｆｅ纳米颗粒的相互作用存在着明显的非线性，即Ｎ２＋与α－ Ｆｅ纳米颗粒的碰撞截面，远大于 Ｎ＋与α－ Ｆｅ纳米颗粒的碰撞截面。

Studies on Surface Modification of Metals by Ion Beam Mixing Implanting With Plasma Source Ion Implantation

Ion implantation, as currently practiced, has been shown to be quite effective in production of semiconductor and integrated circuit as well as surface modification of metal. But it is a line-of-sight process and if the target is non-planar, target manipulation, such as translation or rotation, is required to implant all sides of the target. Even with sophisticated target manipulation system, the performance of beam-line implantor is still limited by the retained dose problem,, i.e. the maximum dose retained by the target is governed by the angle of incidence of the beam. In order to achieve reasonable dose uniformity on targets with curved surfaces, target masking may be employed to restrict the ion beam angle of incidence. Even though the target has sufficient symmetry to accommodate masking, the masking degrades the system performance, and furthermore, sputtering of the masking contaminates the target.

THE MODIFICATION AND ANALYSIS OF 9Cr18 STAINLESS BEARING STEEL AFTER N^+ IMPLANTATION

Ⅰ. INTRODUCTIONMuch work has been done on the modification and phase analysis after N^+ implatation for various carbon content steel, low alloy steel and stainless steel containing low carbon. This article reports the observed modification of 9Cr18 steel after N^+ implatation, and the investigation of the phase variation within the N^+ implantation layer by conversion electron Mssbauer spectroscopy (CEMS)method and X-ray diffraction. Some discussions are also given.

A Mossbauer effect study on high-dose high-flux Ti implantsin stainless steel

The surface properties on both friction and wear resistance can be improved by Ti-ionimplantation.The results show that the significant effect has been obtained by high-dose(】1017cm-2)implantation.This condition can just be satisfied by a metal vapor vacuumarc（MEVVA）ion source.It works in pulse mode and delivers an intense pulse ion cur-rent up to 1 A,which leads to an average ion-beam current density of about