Structural Control of Surface Modified Layrs through Ultrasonically Distributed Electrical Discharges.

通过超声波分布式放电对表面改性层进行结构控制。

基本信息

批准号：
07555531
负责人：
TSUNEKAWA Yoshiki
金额：
$ 0.58万
依托单位：
Toyota Technological Institute
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555531/
关键词：
In-situ Composite Layr Ultrasonic Vibration Electrical Discharge Alloying Surface Modification Aluminum Alloy Substrate Titanium-carbide Precipitate Compositional Gradient Surface Roughness TiAlマトリックス TiC TiAl生成複合材料アルミニウム合金表面改質 /

项目摘要

In order to improve friction and wear characteristics, surface modification of aluminum matrix composites was carried out by applying the new method named Electrical Discharge Alloying, in which each electrical discharge is forcibly scattered by ultrasonic vibration. Titanium contained in the green compact eletrode, and also carbon and silicon decomposed from the working fluid are transferred to the substrate surface through a single discharged arc. Sinece the application of ultrasonic vibration to the aluminum alloy substrate makes the amount of transferred elements increase, the thickness of modified layrs remarkably become thicker. Then, the volume fraction of in situ TiC in the modified surface increases with applying ultrasonic vibration, so that the hardness of modified surfaces becomes high. The process, electrical discharge alloying, makes it possible not only to coat a composite layr containing in situ TiC with a thickness of nearly 80 mum within a few minutes, but also to get high volume fractions of TiC by applying ultrasonic vibration, which is an additional process parameter to discharge conditions. Hradness of the modified surfaces can be controlled to have any value of 4-14 GPa by varying the volume fraction of TiC.It is also recognized that the process improves wear resistance of the modified surfaces.

为了改善摩擦和磨损特性，通过应用称为电气放电合金的新方法进行铝基质复合材料的表面修饰，其中每个电气放电都被超声振动强行散射。绿色紧凑型链球菌中包含的钛还通过单个放电的弧转移到底物表面。 Sinece将超声振动的应用在铝合金底物中的应用使转移元件的量增加，改性层的厚度明显变厚。然后，通过施加超声振动，改性表面中原位的体积分数会增加，从而使改性表面的硬度变得很高。该过程，即电排放合金，不仅可以在几分钟内涂上含有近80辆厚度的原位层的复合材料外行，而且还可以通过施加超声振动来获得TIC的大量分数，这是用于放电条件的附加过程参数。通过改变TIC的体积分数，可以控制修饰表面的HRADNESS具有4-14 GPA的任何值。它也可以确保该过程提高了改进的表面的磨损阻力。