Nickel Aluminum Matrix Solid-Lubricating Composite Lubricated by Silver and Silver Vanadate Formed by Tribochemistry at Elevated Temperature

2019 ◽  
Vol 141 (3) ◽  
Author(s):  
Shengyu Zhu ◽  
Hui Tan ◽  
Jun Cheng ◽  
Yuan Yu ◽  
Zhuhui Qiao ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Friction Coefficient ◽  
High Temperatures ◽  
Matrix Composite ◽  
Wide Temperature Range ◽  
Room Temperature ◽  
Aluminum Matrix ◽  
Solid Lubricants ◽  
Nickel Aluminum ◽  
Silver Vanadate

The synergistic effect of solid lubricants plays a significant role in wide-temperature-range lubrication, where the combination of lubricious oxide and Ag is the promising solid lubricants. In this paper, the friction and wear performances of Ni3Al with the addition of Ag and V2O5 solid-lubricating composites were evaluated from room temperature to 1000 °C. It was found that Ni3Al matrix composite with the addition of V2O5 has high friction coefficient of 0.3–0.7, while Ni3Al matrix composite with simultaneous addition of Ag and 2 wt % V2O5 has a relatively low friction coefficient of 0.25–0.4 between room temperature and 1000 °C and wear rate with the magnitude of 10−5 mm3/N m at high temperatures. The results revealed that nickel aluminum matrix solid-lubricating composite lubricated by silver and in situ formed silver vanadate at elevated temperature achieves a wide-temperature-range lubrication, which is attributed to the synergistic action of silver and silver vanadate formed at high temperatures.

Preparation and Tribological Behavior of Self-Lubrication Composites Ni-W-Cr-Fe-Cu-MoS2-Graphite at Elevated Temperature

2013 ◽  
Vol 668 ◽  
pp. 3-8 ◽  
Author(s):  
Jian Rong Sun ◽  
Chang Sheng Li ◽  
Hua Tang ◽  
Zhi Cheng Guo ◽  
Jin Ying Zi Liu
Keyword(s):  
Tensile Strength ◽  
Elevated Temperature ◽  
Powder Metallurgy ◽  
Friction Coefficient ◽  
Tribological Properties ◽  
Room Temperature ◽  
Tribological Behavior ◽  
Strengthening Effect ◽  
Wear Rates ◽  
Increasing Temperature

The composites of Ni-W-Cr-Fe-Cu-MoS2-Graphite with nano-MoS2 were prepared by powder metallurgy. Its tribological properties were investigated using the UTM-2 Nano+Micro Tribometer from room temperature to 600°C. The effects of amount of MoS2 and Ni-W-Cr prealloy powder, load, and temperature on the tribological properties were investigated and discussed. The results indicated that the addition of 43~45wt.% Ni-W-Cr prealloy powder had a strengthening effect on the hardness, anti-press and tensile strength. The tensile strength of the composite decreases with the addition of Nano-MoS2 and graphite, and the friction coefficient decrease with increase of the additives over the wide temperature range of 25°C∼600°C. The friction coefficients and wear rates of the composites reach the optimization value at 2.5wt.% MoS2,While its wear rates increase with the increasing temperature and load.

Sliding Behavior of Alumina/Nickel and Alumina/Nickel Aluminide Couples at Room and Elevated Temperature

1988 ◽  
Vol 110 (4) ◽  
pp. 646-652 ◽  
Author(s):  
Peter J. Blau ◽  
Charles E. DeVore
Keyword(s):  
Elevated Temperature ◽  
Friction Coefficient ◽  
Nickel Aluminide ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Sliding Friction ◽  
Surface Damage ◽  
Polycrystalline Alumina ◽  
Ordered Intermetallic ◽  
Pin On Disk

Nickel aluminide alloys are ordered intermetallic compounds which show promise for elevated temperature applications, some of which involve sliding contact. The present investigation was conducted to develop an initial understanding of the unlubricated sliding behavior of a nickel aluminide alloy at room and elevated temperatures. In particular, the variations in the friction coefficient and the wear track morphology during the break-in stage and subsequent transitions were studied. Pin-on-disk experiments were conducted at room temperature and at 650° C (923° K) in air using fixed 9.5 mm diameter polycrystalline alumina balls as the pin material. To provide a comparison in behavior, nickel (Ni-200) disks were tested under the same conditions. The sliding friction coefficient of alumina on nickel aluminide was considerably higher than that for alumina on nickel at room temperature, but it was only slightly higher at 650° C. The wear was similar for both materials at room temperature, but the nickel aluminide exhibited relatively mild wear at 650° C, displaying less severe surface damage than the nickel. Work on identifying key friction and wear mechanisms and on evaluating the temperature limitations for future applications will continue.

DUPLEX Al2O3/DLC COATING ON 15SiCp/2024 ALUMINUM MATRIX COMPOSITE USING COMBINED MICROARC OXIDATION AND FILTERED CATHODIC VACUUM ARC DEPOSITION

2012 ◽  
Vol 19 (04) ◽  
pp. 1250036 ◽  
Author(s):  
WENBIN XUE ◽  
HUA TIAN ◽  
JIANCHENG DU ◽  
MING HUA ◽  
XU ZHANG ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Matrix Composite ◽  
Carbon Film ◽  
Microarc Oxidation ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Vacuum Arc ◽  
Low Friction ◽  
Dlc Coating ◽  
Filtered Cathodic Vacuum Arc

Microarc oxidation (MAO) treatment produces a thick Al2O3 coating on the 15SiCp/2024 aluminum matrix composite. After pretreatment of Ti ion implantation, a thin diamond-like carbon film (DLC) was deposited on the top of polished Al2O3 coating by a pulsed filtered cathodic vacuum arc (FCVA) deposition system with a metal vapor vacuum arc (MEVVA) source. The morphology and tribological properties of the duplex Al2O3 /DLC multiplayer coating were investigated by Raman spectroscopy, scanning electron microscopy (SEM) and SRV ball-on-disk friction tester. It is found that the duplex Al2O3 /DLC coating had good adhesion and a low friction coefficient of less than 0.07. As compared to a single Al2O3 or DLC coating, the duplex Al2O3 /DLC coating on aluminum matrix composite exhibited a better wear resistance against ZrO2 ball under dry sliding, because the Al2O3 coating as an intermediate layer improved load support for the top DLC coating on 15SiCp/2024 composite substrate, meanwhile the top DLC coating displayed low friction coefficient.

Large Deformation Thermal-Plasticity in a Shape Active Aluminum Metal Matrix Composite

2000 ◽  
Author(s):  
William D. Armstrong ◽  
Torben Lorentzen
Keyword(s):  
Shape Memory ◽  
Large Deformation ◽  
Matrix Composite ◽  
Room Temperature ◽  
Tensile Elongation ◽  
Linear Thermal Expansion ◽  
Aluminum Matrix ◽  
Heating Process ◽  
Compressive Creep ◽  
Thermal Plasticity

Abstract The present work reports macroscopic thermal mechanical and in-situ neutron diffraction measurements from a 14.4 volume percent, 50.7 at% Ni-Ti fiber actuated 6082-T4 aluminum matrix composite and 6082-T4 homogeneous aluminum control material subjected to a room temperature 5% tensile elongation, and subsequent room temperature to 120 deg. C unconstrained heating process. During the unconstrained room temperature to 120 deg. C heating process, the composite exhibited a 2.2%, nonlinear thermal contraction, while the homogeneous control exhibited the expected linear thermal expansion. The composite thermal compression was clearly the result of a powerful shape memory response in the actuating NiTi fibers. During a subsequent temperature hold at 120 deg. C the composite exhibited an external stress free compressive creep response. The compressive creep behavior was the result of matrix creep under the large compressive stresses imposed by the shape memory active NiTi fibers. In summary, the experimental composite has demonstrated a new form of large deformation self thermal-plastic response which may be used in thermally controlled adaptive machine parts and structures.

High Temperature Lubricating Behavior of NiAl Matrix Composites With Addition of CuO

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
Shengyu Zhu ◽  
Jun Cheng ◽  
Zhuhui Qiao ◽  
Yuan Tian ◽  
Jun Yang
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Powder Metallurgy ◽  
Friction Coefficient ◽  
High Temperatures ◽  
Room Temperature ◽  
Tribological Behavior ◽  
Matrix Composites ◽  
Powder Metallurgy Technique ◽  
Nial Matrix

High temperature self-lubricating NiAl matrix composites with addition of CuO (15, 20, and 25 wt.%) were fabricated by powder metallurgy technique, and the tribological behavior from room temperature to 1000 °C was investigated. It was found that Ni–Cu and Al2O3 phases formed during the fabrication process due to reaction of NiAl and CuO. The tribological results showed that the composite with addition of 25 wt.% CuO has a favorable friction coefficient of about 0.2 and excellent wear resistance with the magnitude of 10−6 mm3 N−1 m−1 at high temperatures (800 and 1000 °C).

Macro-Micro Relationship of Dimensional Changing Behavior of Aluminum Matrix Composite

2020 ◽  
Author(s):  
Deng Gong ◽  
Longtao Jiang ◽  
Youfang Cao ◽  
Yuanzi Zhou ◽  
Tingting Guo ◽  
...  
Keyword(s):  
Matrix Composite ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Relationship Of

Nanocarbon in the Structure of a Hypereutectic Aluminum-Matrix Composite

2020 ◽  
Vol 14 (4) ◽  
pp. 668-672 ◽  
Author(s):  
A. S. Aronin ◽  
I. M. Aristova ◽  
G. E. Abrosimova ◽  
V. V. Vasenev ◽  
V. N. Mironenko
Keyword(s):  
Matrix Composite ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite

scholarly journals Analysis of the Microstructure and Mechanical Properties of TiBw/Ti-6Al-4V Ti Matrix Composite Joint Fabricated Using TiCuNiZr Amorphous Brazing Filler Metal

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 875
Author(s):  
Hao Tian ◽  
Jianchao He ◽  
Jinbao Hou ◽  
Yanlong Lv
Keyword(s):  
Mechanical Properties ◽  
Base Metal ◽  
Matrix Composite ◽  
Room Temperature ◽  
Filler Metal ◽  
Ceramic Fiber ◽  
Tensile Fracture ◽  
Alloy Matrix ◽  
Composite Joint ◽  
Secondary Cracks

TiB crystal whiskers (TiBw) can be synthesized in situ in Ti alloy matrix through powder metallurgy for the preparation of a new type of ceramic fiber-reinforced Ti matrix composite (TMC) TiBw/Ti-6Al-4V. In the TiBw/Ti-6Al-4V TMC, the reinforced phase/matrix interface is clean and has superior comprehensive mechanical properties, but its machinability is degraded. Hence, the bonding of reliable materials is important. To further optimize the TiBw/Ti-6Al-4V brazing technology and determine the relationship between the microstructure and tensile property of the brazed joint, results demonstrate that the elements of brazing filler metal are under sufficient and uniform diffusion, the microstructure is the typical Widmanstätten structure, and fine granular compounds in β phase are observed. The average tensile strength of the brazing specimen is 998 MPa under room temperature, which is 97.3% of that of the base metal. During the high-temperature (400 °C) tensile process, a fracture occurred at the base metal of the highest tensile test specimen with strength reaching 689 MPa, and the tensile fracture involved a combination of intergranular and transgranular modes at both room temperature and 400 °C. The fracture surface has dimples, secondary cracks are generated by the fracture of TiB whiskers, and large holes form when whole TiB whiskers are removed. The proposed algorithm provides evidence for promoting the application of TiBw/Ti-6Al-4V TMCs in practical production.

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