Metal-Matrix Composites and Thermal Spray Coatings for Earth Moving Machines

Weaver, D. Trent ; Zok, Frank W. ; Levi, Carlos G. ; Kiser, Matthew T.

Caterpillar Inc.

关键词: Abrasives;    Fractures;    Testing;    Hardness;    Steels;   

DOI  :  10.2172/820934
RP-ID  :  NONE
RP-ID  :  FC26-01NT41054
RP-ID  :  820934

美国|英语

来源: UNT Digital Library

【 摘 要 】

In the ninth quarter, investigations in steel matrix composites focused on characterization of abrasive wear and fracture test coupons in order to gain a better understanding of the material attributes contributing to the observed behavior in each test. Both the wear and fracture work found that the performance of the carbide cermet based composites was significantly affected by the dissolution of the hard particles and the elements added in hopes of discouraging dissolution. both thrusts focused on abrasive wear characterization. In abrasive wear this led to increase matrix hardness which increased wear resistance, however the fracture toughness of the composites were significantly reduced. In contrast, the oxide based composites demonstrated good fracture characteristics and the oxide particles provided superior protection to the high stress gouging wear imparted by pin-abrasion testing. For the thermal spray coating effort, modified coatings and fusing parameters were explored on simulated components. Significant improvements appear to have been achieved, and are demonstrated in the lack of observable cracking in the coatings. The abrasive wear characteristics of these components will be explored in the 10th quarter. An overview of the progress during the 9th quarter of this project is given below. Additional research details are provided in the limited rights appendix to this report.