Mechanical and wear properties on in-situ directly nitrided sintered Al-AlN composite material

摘要

In-Situ directly nitrided and sintered Al-AlN composite material has been developed by utilizing a chemical reaction between aluminum and nitrogen gas at temperatures below 823K. It shows superior mechanical properties to those of conventionallypremixed and sintered Al-AlN composite. It is primarily due to good bonding of the in-situ formed AlN to the matrix. The advanced P/M aluminum alloy shows an extremely low friction coefficient, such as 0.004 to 0.008 under oil lubrication. It also hasexcellent wear resistance and anti-seizure property compared to I/M aluminum alloys with hard anodized plating. This is because micro oil grooves existing along in-situ formed AlN seems to work as oil pits and make it easy to keep hydraulic lubricationwith thin oil films on the sliding surface.