Effects of Glass Glaze on Wear Resistance of Cr2O3 Ceramic Coating

2012 ◽  
Vol 252 ◽  
pp. 267-270
Author(s):  
Shu Pin Zhang ◽  
Zan Liu ◽  
Chang Jun Qiu
Keyword(s):  
Weight Loss ◽  
Wear Resistance ◽  
Room Temperature ◽  
Ceramic Coating ◽  
Thermal Spraying ◽  
Ceramic Coatings ◽  
Mass Ratio ◽  
Resistance Furnace ◽  
The Impact ◽  
Spray Gun

In this paper, the thermal spraying powder, which was made by sintering, was respectively mixed by Cr2O3 and glass glaze at the mass ratio of 85%, 95%, and 100%.The three mixed powders were sprayed on the surface of 45 steel by CP-3000 subsonic spray gun. Then the samples were heated in the resistance furnace until the temperature reached 1050°C. At room temperature,the wear resistance of these three kinds of coatings were investigated along with load and time changing under water lubricating. The impact of glass glaze on coatings was found after analyzing the change of the weight loss of the coatings. The result showed that there was not the shedding of splat except some brittle micro-peeling at the rim of splat and furrow on the surface of 85% and 95% Cr2O3 ceramic coatings. The wear resistance of the coatings was improved with the increase of the percentage of glass glaze , and began to desend when the percentage arrived at a certain degree. It indicated that the wear resistance was the best when the percentage was about 95% in this experiment.

scholarly journals Physical and metabolic alterations in "Prata Anã" banana induced by mechanical damage at room temperature

2011 ◽  
Vol 68 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Victor Martins Maia ◽  
Luiz Carlos Chamhum Salomão ◽  
Dalmo Lopes Siqueira ◽  
Rolf Puschman ◽  
Virgílio Jamir Gonçalves Mota Filho ◽  
...  
Keyword(s):  
Weight Loss ◽  
Enzyme Activity ◽  
Electrolyte Leakage ◽  
Room Temperature ◽  
Soluble Sugar ◽  
Mechanical Damage ◽  
Fresh Weight ◽  
Physiological Level ◽  
Metabolic Alterations ◽  
The Impact

Bananas respond at the physical and physiological level to mechanical damage. Mechanical injuries cause alterations in color and flavor, tissue softening, faster ripening, increased weight loss, increased invasion of microorganisms, and higher enzyme activity in the affected area. The purpose of this study was to verify the physical and metabolic alterations in 'Prata Anã' bananas induced by mechanical stress at room temperature. The experiment was conducted in a completely randomized, split-plot in time design, consisting of one control and four mechanical injury types: cutting, abrasion, impact and compression, sampled over time. The percentage of accumulated and daily fresh weight loss, electrolyte leakage from the injured peel region, total soluble sugar and starch contents and enzyme activity of polyphenoloxidase and peroxidase were measured. The damage caused by cutting and abrasion resulted in the highest percentage of fresh weight loss. All types of mechanical damage increased electrolyte leakage during the evaluation period, in comparison with the control. The impact damage anticipated the ripening, besides affecting the conversion of starch into total soluble sugars in the pulp. By impact and abrasion injuries, the polyphenoloxidase and peroxidase activity in the peel was increased by up to 231% and 90%, and 618% and 956%, respectively, compared to the control.

Solid Particle Erosion of Selected HVOF Sprayed Coatings

2016 ◽  
Vol 827 ◽  
pp. 39-46
Author(s):  
Šárka Houdková ◽  
Zdeněk Česánek ◽  
Pavel Polach
Keyword(s):  
Wear Resistance ◽  
Wear Mechanism ◽  
Thermal Spraying ◽  
Impact Angle ◽  
Erosion Wear ◽  
Wear Properties ◽  
Experimental Development ◽  
The Subject ◽  
The Impact ◽  
Super Alloy

The paper involves the subject and the chosen results of up to now solving of work package “Development of advanced surface treatment of components used in parts of turbines working under the condition of operational temperatures of steam using the HP/HVOF technology of thermal spraying” of the Competence Centre project “Centre of Research and Experimental Development of Reliable Energy Production”. The subject belongs to the field of material engineering and results of solving contribute to fulfilling the main project aim, which is a long time safeguarding of safe, reliable and financially available both classical thermal and nuclear sources of electric power, which consists in extending service life of existing and building new turbo generator blocks. The erosion wear resistance is one of the areas, which were observed. The impact of hard particles on the surface under variable impact angles was simulated in laboratory conditions using an in-house equipment. The wear resistance of selected HVOF sprayed hardmetal and super-alloy coatings was measured and the wear mechanism was evaluated. A strong influence of impact angle on both material volume loss and wear mechanism was monitored. The superior erosion wear properties of super-alloy coatings were proved, regardless the higher hardness of hardmetal coatings.

scholarly journals Analysis and Development Review of Metal and Metal/Ceramic Composite Coating Prepared on Magnesium Alloy Surface

2022 ◽  
Vol 2152 (1) ◽  
pp. 012025
Author(s):  
Haichuan Zhang ◽  
Xuemei Pu ◽  
Hua Yang ◽  
Yifan Jiang ◽  
Xiao Wang
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Magnetron Sputtering ◽  
Ceramic Composite ◽  
Ceramic Coatings ◽  
Research Progress ◽  
Alloy Surface ◽  
Metal Ceramic ◽  
The Impact

Abstract Magnesium, as one of the lightest metal structural materials, also has its advantages such as high specific strength, good electromagnetic shielding characteristics, good processability and easy recycling, so it has a wide application prospect. However, its poor insulation, corrosion resistance, wear resistance and other properties limited it to be an alloy that can be used in a large area. Therefore, how to improve the corrosion resistance and wear resistance of magnesium alloy is the key to promote the development of magnesium alloy field. This paper reviews the research progress of using magnetron sputtering technology to prepare ceramic composite film on the surface of magnesium alloy and briefly introduces the film corrosion resistance and wear resistance of the thin films. It analyzes the impact of metal transition layer, process parameters and other factors on structure and properties of metal / ceramic coatings and prospects for the development prospects of magnetron sputtering in the field of magnesium alloy surface protection.

Impact and Sliding Wear Resistance of Hadfield and Rail Steel

2011 ◽  
Vol 146 ◽  
pp. 112-123 ◽  
Author(s):  
R. Harzallah ◽  
A. Mouftiez ◽  
S. Hariri ◽  
E. Felder ◽  
J.P. Maujean
Keyword(s):  
Weight Loss ◽  
Wear Resistance ◽  
Sliding Wear ◽  
Rail Steel ◽  
Fatigue Behaviour ◽  
Contact Forces ◽  
Hadfield Steel ◽  
Surface Examination ◽  
The Impact ◽  
Time In Service

Railway networks are subjected to more and more severe loading conditions requiring the use of steels with a high resistance to wear and good fatigue behaviour. The surveys carried out on out of use equipment, such as rails or switches, show that these equipments fail by wear after quite a long period of use, but they can fail by fatigue in a substantially shorter time. In service, crossings are submitted to rolling, impact and sliding stresses. The impact-sliding is the result of the wheel transition from rail wing to crossing nose. Very high contact forces act on the crossing nose while such wheels are passing over it. These large contact forces between wheel and crossing can cause severe damage at crossing nose and wing rail. The influence of contact parameters on the damage of the crossing alloy (Hadfield steel GX120Mn13) in comparison with rail steel (R260) was investigated by impact and impact-sliding tests. The results are described and discussed using weight loss and microhardness measurements, optical and scanning electron microscopy observations of the contact surface. Examination of the results shows large plastic deformation in surface and subsurface of samples. In comparison with impact tests, sliding produces a change in size and shape of the contact area, a higher weight loss and lower hardening. A better impact–sliding wear resistance of Hadfield steel has been confirmed.

Fabrication and Properties of In Situ B13P2 Reinforced Cu-Based Composites

2017 ◽  
Vol 898 ◽  
pp. 1007-1014
Author(s):  
Zu Xin Sun ◽  
Yu Ying Wu ◽  
Xiao Li Cui ◽  
Guo Jun Zhang ◽  
Xiang Fa Liu
Keyword(s):  
Weight Loss ◽  
Wear Resistance ◽  
Matrix Composite ◽  
Total Content ◽  
Reinforced Composites ◽  
Mass Ratio ◽  
New Type ◽  
Pure Cu ◽  
Resistance Data

In this work, a new type of B13P2 reinforced Cu matrix composite (B13P2/Cu) with excellent wear resistance properties has been fabricated. The experimental results reveal that when the total content of P and B was 3wt.% and the mass ratio of P to B was 2:3, the brittle reticular divorced eutectic Cu3P disappeared and B13P2 phase uniformly distributed in Cu matrix. The microstructure can be controlled and designed according to the ratio of P and B. The microhardness of B13P2 reached up to 1837 HV, which was as high as that of SiC, while the mircohardness of Cu matrix was about 5 times more than pure that of Cu. The wear resistance data indicate that the largest weight loss of pure Cu was approximately four times more than that of the B13P2 reinforced composites at the 40 min. The CTE of the new composites also decreased as compared with pure Cu.

scholarly journals Egg quality of Banat naked neck hens during storage

2021 ◽  
Vol 37 (2) ◽  
pp. 87-97
Author(s):  
Zdenka Skrbic ◽  
Milos Lukic ◽  
Veselin Petricevic ◽  
Snezana Bogosavljevic-Boskovic ◽  
Simeon Rakonjac ◽  
...  
Keyword(s):  
Weight Loss ◽  
Room Temperature ◽  
Storage Time ◽  
Egg Quality ◽  
Internal Quality ◽  
Egg Weight ◽  
Naked Neck ◽  
The Impact ◽  
Temperature Storage

In less intensive production systems, native poultry breeds can be used in order to diversify the products and achieve self-sustainability of these breeds through production. Given the missing data on the sustainability of quality of eggs obtained from indigenous, native hens, during storage, the aim of the study was to determine the most important parameters of egg quality of indigenous breed of Banat Naked Neck hens during a four-week period in different storage conditions. The design of the experiment was two-factorial with 4 levels of storage time factors (fresh eggs - 0, 1, 2, 3 and 4 weeks of storage) and 2 levels of temperature storage condition factors (room temperature and refrigerator). The room temperature was on average 21.3?C and the refrigerator temperature 8?C. Quality analysis was performed on a total of 200 eggs, and it included following parameters: egg weight, egg weight loss, weight and proportion of structural components: shell, yolk and albumen, albumen height, yolk colour, Haugh Units and albumen pH. The storage time had a significant effect on all properties of egg quality, except for the yolk colour, which was under the impact of the interaction of storage time and temperature. Storage temperature influenced egg weight loss (<0.001), shell weight (<0.05), albumen height (<0.0001), Haugh Units (<0.0001) and albumen pH (<0.0001). By storing in the refrigerator, changes in internal quality were significantly slowed down. After 28 days of storage in the refrigerator, the values of albumen and Haugh Units were higher than the same parameters of eggs stored for only 7 days at room temperature.

Structure and tribological properties of super-hardened strengthening coatings based on boron carbide

2020 ◽  
pp. 134-140
Author(s):  
Aleksey G. Ipatov ◽  
Evgeniy V. Kharanzhevskiy ◽  
Sergey N. Shmykov
Keyword(s):  
Wear Resistance ◽  
Boron Carbide ◽  
Fusion Zone ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Mechanical Engineering ◽  
Ceramic Coatings ◽  
Research Purpose ◽  
Powder Materials ◽  
The Impact

The use of standard alloys, in particular steels, to increase the wear resistance of contact surfaces in mechanical engineering in most cases has lost its relevance due to low mechanical and tribological properties. Currently, in mechanical engineering, as well as in repair production, technologies for obtaining functional and restorative coatings that differ significantly from the properties of the product material are widely implemented. (Research purpose) The research purpose is in studying the physical and tribological properties of ceramic coatings obtained by laser melting of fine powder materials. (Materials and methods) Authors used a powder mixture based on boron carbide and nitride as the initial powder materials as the most solid, heat-resistant and chemically inert compounds, additionally doped with magnesium oxide and lithium. Authors used an ytterbium fiber laser with a maximum power of 50 watts as a laser radiation generator. (Results and discussion) It was found that laboratory studies confirm the high adhesion of the ceramic coating with a steel substrate. It also was found that stable chemical compounds based on iron carbides and borides are formed in the fusion zone. The article notes that the high impact strength of the coating was confirmed by the shock tests of samples-in the impact (destruction) zone, there is no formation of significant cracks and chips of the coating, the fusion zone without traces of separation and destruction. The article shows that the lowest coefficient of friction at elevated temperature and dynamic loads is observed in coatings with the presence of metal oxides, this is explained by the accelerated formation of a tribofilm based on boric acid. (Conclusions) The presented results have a high scientific basis and practical potential. The low coefficient of friction and high wear resistance allow to use the results of research in tribo-couplings that are operated under high temperatures and kinematic characteristics.

scholarly journals Microstructure and Wear Behaviors of Plasma-Sprayed MoAlB Ceramic Coating

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 474
Author(s):  
Fuzhu Li ◽  
Shengnan Sun ◽  
Yong Xu ◽  
Lihui Tian ◽  
Yun Wang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Plasma Spraying ◽  
Ceramic Coating ◽  
Adhesive Wear ◽  
Ceramic Coatings ◽  
Atmospheric Plasma ◽  
Wear Rates ◽  
Arc Power ◽  
Plasma Sprayed

MoAlB ceramic coatings were prepared on a 316 steel surface by atmospheric plasma spraying with different arc power levels. The phase composition, microstructure and wear resistance of coatings against GCr15 and Si3N4 counterparts were studied. The MoAlB ceramic decomposed and was oxidized to form MoB and Al2O3 during plasma spraying. With the increase of the arc power, MoAlB experienced more decomposition, but the coatings became denser. When the arc power increased from 30 to 36 kW, the wear rates of coatings against GCr15 and Si3N4 balls reduced by 91% and 78%, respectively. The characterization of wear tracks shows that when against GCr15 counterparts, the main wear mechanisms are abrasive and adhesive wear, and when against Si3N4 counterparts, fatigue and abrasive wear are dominant. The refinement of wear resistance by increasing arc power can be attributed to the improvement of density and adhesive strength among splats.

scholarly journals Kualitas Telur Puyuh Selama Penyimpanan dan Temperatur yang Berbeda

2020 ◽  
Vol 10 (1) ◽  
pp. 70
Author(s):  
Rizki Arizona ◽  
Abdul Rahman Ollong
Keyword(s):  
Weight Loss ◽  
Factorial Design ◽  
Cell Size ◽  
Room Temperature ◽  
Storage Time ◽  
Shape Index ◽  
Refrigerated Storage ◽  
Significant Difference ◽  
The Impact

The objective of this study is to determine the quality of quail eggs stored at room temperature and refrigerated. The variables evaluated are weight loss, shape index, air cell size, and the height of both the albumen and the yolk. Several factors, such as storage time and temperature could affect the quality of quail eggs. Therefore, we investigated the impact of both factors. The samples used for this experiment include 360 quail eggs. This research uses a completely randomized factorial design with two treatments. The treatments consisted of storage time (0, 7, 14, and 21 days) and temperature (room temperature and refrigerator). Each treatment was replicated 9 times. Analyses of variance had been applied to analyze the data and followed with Duncan’s test to see whether there was a significant difference between treatments. The result showed that storage time and temperature have significant effects on weight loss of the eggs, air cell size, and albumen and yolk height. The interaction between treatments had a significant impact on air cell size and yolk height. Refrigerated storage for 21 days showed the best result.

Evaluation of Hardness, Local Strength and Contact Fatigue of Brittle Ceramic Coatings at High Temperatures by Hertz Indentation

2010 ◽  
Vol 434-435 ◽  
pp. 558-561
Author(s):  
De Tian Wan ◽  
Yi Wang Bao ◽  
Xiao Gen Liu ◽  
Kun Ming Li
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Room Temperature ◽  
Ceramic Coating ◽  
Brinell Hardness ◽  
Contact Fatigue ◽  
Ceramic Coatings ◽  
Indentation Method ◽  
Fatigue Lifetime ◽  
Local Strength

In this work, Hertz indentation method was proposed to investigate the hardness, local strength and cyclic contact fatigue of brittle ceramic coating at high temperatures. The testing fixture for high temperature tests is designed, which is made of SiC. A Si3N4 ball with a diameter of 5 mm is used as the indenter and the CVD SiC/SiC composite is used as testing samples. The applied loads are ranged from 300 N to 700 N and the temperatures are among of room temperature to 1100 oC. The critical load and indent size are used to calculate the Brinell hardness and local strength of CVD SiC coating at room temperature and high temperatures. The contact damage under different loading number and period are analyzed. The mechanisms for the improved local strength and contact fatigue lifetime are discussed.

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