Open AccessMETAL-MATRIX COMPOSITES AND THERMAL SPRAY COATINGS FOR EARTH MOVING MACHINES
Author(s) -
Matthew T Kiser
Publication year - 2002
Language(s) - English
Resource type - Reports
DOI - 10.2172/793663
Subject(s) - materials science , composite number , brinell scale , wetting , composite material , abrasive , metallurgy , temperature cycling , abrasion (mechanical) , infiltration (hvac) , thermal , alloy , physics , meteorology
In the fourth quarter, more pressure casting trials on steel/WC-Co composite were carried out. In addition, initial trials on steel/Al{sub 2}O{sub 3} composite were started. The effects of processing parameters on infiltration process were investigated. It was found the quality of infiltration was determined by wettability of the liquid steel on hard particles, preheating temperature of the die, pouring temperature, and applied pressure. From the preliminary study on pressure casting of steel/Al{sub 2}O{sub 3} composites, little infiltration was observed because of poor wetting and rapid solidification of liquid steel. UC Santa Barbara was able to make a steel/Al{sub 2}O{sub 3} composite in a hot isostatic press which will be used to evaluate the viability of this composite system. For thermal spray coatings, another round of coupons were sprayed for arc-lamp processing trials at Oak Ridge National Lab. Low stress scratching wear measurements at Albany Research Center on coupons from the previous arc-lamp trial demonstrated that the coatings had 3-10X higher abrasive wear resistance than Brinell 500 abrasion resistant plate. An overview of the progress during the 4th quarter of this project is given below. Research details are provided in the limited rights appendix to this report