Performance and Wear Test Results for a 20 kW-Class Ion Engine with Carbon-Carbon Grids

2005 ◽  
Author(s):  
Jay Polk ◽  
Dan Goebel ◽  
John Synder ◽  
Analyn Schneider ◽  
Lee Johnson ◽  
...  
Keyword(s):  
Wear Test ◽  
Test Results

Effect of nano Al2O3 coated Ag reinforced Cu matrix nanocomposites on mechanical and tribological behavior synthesis by P/M technique

2020 ◽  
Vol 54 (30) ◽  
pp. 4921-4928
Author(s):  
A Mohamed ◽  
MM Mohammed ◽  
AF Ibrahim ◽  
Omyma A El-Kady
Keyword(s):  
Wear Behavior ◽  
Composite Coatings ◽  
Microstructural Analysis ◽  
Wear Test ◽  
Test Results ◽  
X Ray Diffraction ◽  
X Ray ◽  
Average Hardness ◽  
Ag Particles ◽  
Matrix Nanocomposites

In this study, copper powder was reinforced with different weight percentages of Al2O3 particles (0, 5, 10, and 15 wt.% Al2O3 coated Ag) to produce Cu-Al2O3 composites by mechanical alloying and uniaxial cold pressing/sintering route. Electro-less deposition was used to coat Al2O3 particles with Ag. The microstructure of the consolidated samples was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) elemental mapping. The porosity, microhardness, and wear behavior of the consolidated samples were also investigated as a function of Al2O3 content. The EDX mapping images reveal that the Al2O3 reinforcement particles were homogeneously distributed into the Cu matrix. Microstructural analysis shows that the addition of Al2O3 coated Ag particles improves density of the composites coating. SEM micrographs result shows that slight porosities exist in the composites produced. Furthermore, the average hardness of the composite coatings varies from 72.3 to 187.6 HV as Al2O3 content increases from 0 to 15 wt.%. The wear test results showed that the composite with higher Al2O3 content 15 wt.% showed the best wear resistance.

Wear Characteristics of Polycrystalline Diamond Compact Drill Bits in Small Diameter Rock Drilling

1985 ◽  
Vol 107 (4) ◽  
pp. 534-542 ◽  
Author(s):  
C. L. Hough ◽  
B. Das
Keyword(s):  
Small Diameter ◽  
Polycrystalline Diamond ◽  
Wear Test ◽  
Test Results ◽  
Failure Characteristics ◽  
Wear Characteristics ◽  
Drill Bits ◽  
Rotary Speed ◽  
Polycrystalline Diamond Compact ◽  
Single Material

The wear characteristics of polycrystalline diamond compact (PDC) drill bits were investigated in the context of drilling small holes in a hard abrasive medium. An efficient method for measuring wear of the PDC drill bits was developed. The wear test results were grouped or categorized in terms of rotary speed, feed and wear or failure characteristics. Contrary to the three classical wear phases (break-in, uniform wear and rapid breakdown) of the single material cutters, four distinctive wear phases were formed for the PDC cutters: I–break-in, II–diamond wear, III–carbide wear, and IV–rapid breakdown. The characteristics of the wear phases were identified and some suggestions were made to alleviate the wear problem.

Adsorption and Tribochemical Reactions

1989 ◽  
Vol 159 ◽  
Author(s):  
W. M. Mullins ◽  
T. E. Fischer
Keyword(s):  
Free Energy ◽  
Band Gap ◽  
Reaction Rate ◽  
Water Adsorption ◽  
Surface Reaction ◽  
Wear Test ◽  
Aqueous Solubility ◽  
Test Results ◽  
Effect Of Water ◽  
Model Fluids

ABSTRACTA model for chemisorption based on the Lewis theory is proposed and developed. The model reproduces the observed relationship between aqueous solubility and band gap for covalent oxides. A relationship is shown between the calculated free-energy of the surface reactions and the observed effect of water on the wear of these materials. This relationship is explained in terms of surface reaction rate and equilibrium. Similar calculations for the adsorption of -CH3 functional groups are presented. The results are compared to water adsorption calculations and related to experimental wear test results for model fluids on covalent oxides. The effect of water on lubricant adsorption is discussed.

scholarly journals Characterization of mechanical properties of composite materials with filler coconut shell powder and sawdust with coconut fiber reinforcement as an alternative to low loaded brake friction materials

2021 ◽  
Vol 9 (2) ◽  
pp. 017-023
Author(s):  
Anak Agung Alit Triadi ◽  
Sujita Darmo
Keyword(s):  
Wear Test ◽  
Hardness Test ◽  
Friction Material ◽  
Test Results ◽  
Sintering Process ◽  
Wear Rates ◽  
Safety Standards ◽  
Composition Variation ◽  
Brake Lining

The purpose of the study is to determine the best composition variation of the fifth variation of the composition of the composite material against the wear test, hardness test, tensile test comparing values ​​ with the safety standards of the brake lining composite SAEJ 661. Making the specimens was performed by mixing the ingredients with a mixer for 15 minutes and then do the process of compaction, with a load of 4 tons and detained achieve holding time is desired, then dies (mould) are placed in the oven and do the sintering process at a temperature of 1500 C for 180 minutes and specimens removed from the mould, the process of finishing and testing. These test results show that the composition of the material that is on variation V best price obtained 96.575 HBN hardness, wear rates of 1,29x10-6 gr / (mm2.detik), and a tensile strength of 0.842 MPa, but the brake friction material not meet safety standards SAEJ brake 661.

Microstructural characteristics and protection performances of plasma-sprayed Al2O3–Al composite coatings on AZ91D magnesium alloy

2016 ◽  
Vol 23 (5) ◽  
pp. 467-474 ◽  
Author(s):  
Huanhuan Sun ◽  
Shuqin Ma
Keyword(s):  
Composite Coatings ◽  
Wear Test ◽  
Az91d Alloy ◽  
Test Results ◽  
Microstructural Characteristics ◽  
Az91d Magnesium Alloy ◽  
Eds Analysis ◽  
Al Composite ◽  
Chloride Environment ◽  
Plasma Sprayed

AbstractFour Al2O3-Al composite coatings were successfully fabricated on AZ91D alloy by plasma sprayed with changing ratios of Al2O3 and Al mixed powders, respectively. XRD results indicate that all the composite coatings are composed of γ-Al2O3, α-Al2O3, and Al. SEM and EDS analysis find that Al2O3-Al composite coatings present the interlaced structures of Al and Al2O3 bands. VIDAS image analysis reveals that the porosities of the composite coatings are increased by adding Al2O3. In the composite coatings, the hardness of Al is about 62 HV and that of Al2O3 is up to 1380 HV. The electrochemical polarization tests testify that Al2O3-Al composite coatings can effectively protect AZ91D alloy from corroding in a chloride environment. The wear test results confirm that the wear resistance of Al2O3-Al composite coatings is markedly superior to that of AZ91D alloy. The excellent protection degrees are attributed to their particular compositions, microstructures, and properties. Moreover, the effect of Al2O3 contents on the microstructures and protection performances of Al2O3-Al composite coatings was also studied and discussed in detail.

The effect of ball hardness on four-ball wear test results

Wear ◽  
2008 ◽  
Vol 264 (7-8) ◽  
pp. 662-670 ◽  
Author(s):  
T. Leśniewski ◽  
S. Krawiec
Keyword(s):  
Wear Test ◽  
Test Results

Dilution and C Content Estimation of Stellite 6 Fabricated on a 1050 Steel Substrate by Laser Cladding

2017 ◽  
Vol 263 ◽  
pp. 131-136
Author(s):  
Alain Kusmoko ◽  
Druce Dunne ◽  
Hui Jun Li
Keyword(s):  
Laser Cladding ◽  
Steel Substrate ◽  
Testing Machine ◽  
Wear Test ◽  
Wear Testing ◽  
Chemical Compositions ◽  
Test Results ◽  
Stellite 6 ◽  
Service Conditions ◽  
Stellite Coating

Stellite 6 was fabricated by laser cladding on a 1050 steel (MS) substrate with laser powers of 1 kW (MS-1) and 1.8 kW (MS-1.8). The chemical compositions and microstructures of the coatings were analysed by X-Ray Fluoroscense, optical microscopy and scanning electron microscopy. The microhardness of the coatings was examined and the wear mechanism of the coatings was evaluated using a ball-on-plate wear testing machine. The results indicated less cracking and pore development for Stellite 6 coatings applied to the 1050 steel substrate with the lower laser power (MS-1). Moreover, the Stellite coating for MS-1 was significantly harder than that obtained for MS-1.8. The wear test results showed that the weight loss for MS-1 was much lower than for MS-1.8. The evaluations of dilution and calculation of carbon content indicated that MS-1 has lower dilution and higher coating C content than MS-1.8. It is concluded that the lower hardness of the coating for MS-1.8, substantially reduced the wear resistance of the Stellite 6 coating and the lower hardness of the coating for MS-1.8 was due to higher level of dilution and lower coating C content. The coating-substrate couple must be considered in assessing the likely performance of the coating under service conditions.

Assessment of Correlation Between Bench Wear Test Results and Engine Cylinder Wear, Short-Trip Service

2000 ◽  
Author(s):  
Simon C. Tung ◽  
Shirley E. Schwartz ◽  
Kevin B. Brogan ◽  
Chris J. Mettrick
Keyword(s):  
Wear Test ◽  
Test Results ◽  
Short Trip ◽  
Engine Cylinder
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