id	keyword
ajst-8906	wear
ajst-8906	friction
ajst-8906	alloy
ajst-8906	composites
ajst-8906	sliding
ajst-8906	properties
ajst-8906	nano
ajst-8906	surface
ajst-8906	materials
ajst-8906	metal
ajst-8906	temperature
ajst-8906	steel
ajst-8906	lubricating
ajst-8906	rate
ajst-8906	self
ajst-8906	fig