Abrasive wear behavior of NiAl and NiAl-TiB{sub}2 composites

摘要

Abrasive wear of NiAl and NiAl with 10, 20, and 40 vol.% TiB{sub}2 has been investigated using particles of different types and sizes. The addition of TiB{sub}2 as a particulate reinforcement to NiAl increases the hardness of the composite withrespect to NiAl, and reduces the wear rate at all volume fractions on garnet and Al{sub}2O{sub}3 abrasives. Abrasion on SiC resulted in a minimum of the wear rate for the composite with 20% TiB{sub}2 for most conditions. The composite with 40% TiB{sub}2consistently exhibited wear rates higher than the other composites when abraded on SiC. The only instance when the NiAl-40% TiB{sub}2 composite had a lower wear rate was when it was abraded on 16 and 37μm SiC particles. The NiAl-TiB{sub}2 compositeserves as a model system for studying the effect of reinforcement volume fraction on composite wear behavior and is discussed in terms of a composite wear model developed by Axen and Jacobson.