Microstructure and High-Temperature Frictional Wear Property of Mo-Based Composites Reinforced by Aluminum and Lanthanum Oxides

This paper have studied the high temperature frictional wear properties of Ni-P coatings on 20CrMo steel manufactured by electro-brush plating. A ball-on-disc configuration with no lubricants was employed and 4 mm diameter Si3N4 ball was used as static counterpart. The results showed that with the coating time increased from 0 to 24 minutes, the overall average friction coefficient and the mass worn loss of specimens were both declined in the wear test at 450 oC for 180 minutes. The wear became slighter as the coating time increased. When the coating time were 0, 6, 12 and 18 minutes, the main wear form of samples were deep microscopic plough cutting and spalling failure. As the coating time increased to 24 minutes, its main wear form were shallower microscopic plough cutting, almost no spalling failure.

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Characteristics of the Nial/Ni3al Matrix Composite With Tib2 Particles Fabricated By High Pressure – High Temperature Sintering

Archives of Metallurgy and Materials ◽

10.1515/amm-2017-0234 ◽

2017 ◽

Vol 62 (3) ◽

pp. 1511-1520 ◽

Cited By ~ 3

Author(s):

P. Hyjek ◽

I. Sulima ◽

L. Jaworska

Keyword(s):

High Pressure ◽

High Temperature ◽

Matrix Material ◽

Two Phase ◽

Reinforcing Particles ◽

Frictional Wear ◽

High Pressure High Temperature ◽

Composite Hardness ◽

Tib2 Particles ◽

Al Matrix

AbstractThe article presents the results of tests carried out on the manufactured composite materials based on a two-phase NiAl/Ni3Al matrix, which was enriched with the addition of TiB2ceramic particles added in an amount of 4 and 7 vol%. The resulting mixtures were sintered by the High Pressure High Temperature (HP-HT) process. The results were compared to the results obtained for the sole matrix material produced under the same conditions. It has been shown that, at a lower density, the addition of reinforcing particles increases the composite hardness, Young’s modulus and resistance to frictional wear. However, higher addition of TiB2(7 vol%) was observed to yield less satisfactory results, and despite higher hardness and lower density caused a decrease in other properties tested. The produced materials were characterized by a compact and highly differentiated microstructure free from any noticeable cracks and pores.

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Effect of Sliding Speed on Wear Property of MoSi2 at High Temperature

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.66-68.150 ◽

2011 ◽

Vol 66-68 ◽

pp. 150-154

Author(s):

Hou An Zhang ◽

Si Yong Gu

Keyword(s):

Electron Microscope ◽

High Temperature ◽

Friction Coefficient ◽

Wear Rate ◽

Friction And Wear ◽

Wear Property ◽

Sliding Speed ◽

X Ray ◽

Very High ◽

Scanning Electron

Wear behaviors of MoSi2against Al2O3or SiC under 30N at 1000°C in air have been investigated by using an XP-5 type High Temperature Friction and Wear Tester. The worn surfaces and phases of samples were characterized by scanning electron microscope (SEM) and X-ray diffractometer, respectively. Result shows the wear rate and friction coefficient of MoSi2decreases with the increase of sliding speed. SiC is superior to Al2O3as the counter-face materials of MoSi2. Serious adhesion leads to very high wear rate of Al2O3in this experiment. SiC shows a surprising mass weighing phenomenon, which is caused by oxidation. The main wear mechanism of MoSi2against Al2O3is oxidation and adhesion. However when against SiC, it is chiefly controlled by grinding.

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