scholarly journals Development and tribological characterization of fly ash reinforced iron based functionally gradient friction materials

2021 ◽  
Vol 41 (3) ◽  
Author(s):  
Kasi Rajesh Kannan ◽  
Ramalingam Vaira Vignesh ◽  
Kota Pavan Kalyan ◽  
Myilsamy Govindaraju
Keyword(s):  
Fly Ash ◽  
Wear Rate ◽  
Wind Turbines ◽  
Friction Material ◽  
Hard Phase ◽  
Friction Materials ◽  
Functional Gradient ◽  
Backing Plate ◽  
Functionally Gradient ◽  
Iron Based

The tribological and thermal properties enable iron based sintered materials with hard phase ceramic reinforcements as promising friction material for heavy-duty wind turbines. In wind turbines, the braking system consists of aerodynamic and mechanical braking systems. During application of mechanical brakes, the friction materials are pressed against the rotating low-speed shaft. The desired braking efficiency is achieved by utilizing a number of friction materials, which in turn are joined in a steel backing plate. Though this arrangement increases the braking efficiency, the hard phase ceramic reinforcement particles reduces the bonding strength between the friction material and steel backing plate. The joint failure leads to catastrophic failure of wind turbine. Therefore, the need of the hour is to develop friction materials with functional gradients that have high wear resistance (contact area) and high bond strength (interface). In this study, an attempt is made to fabricate and characterize a friction material with gradient profile of composition along the cross section to provide functional gradient property. The functional gradient friction material is synthesized by gradient deposition of Fe, Cu, Cg, SiC and fly ash powders which is then compacted and sintered. The prepared functional gradient friction material was characterized in terms of microstructure and microhardness. The tribological performance (wear rate and coefficient of friction) of the developed functionally gradient friction material was investigated at various loads using pin-on disc apparatus. The results show that as the load increases, the wear rate decreases and at the same time the COF tends to increase at higher loads. The predominant wear mechanism was deduced from the morphology of the worn surface.

Development of fly ash based friction material for wind turbines by liquid phase sintering technology

2020 ◽  
pp. 135065012096399
Author(s):  
K Rajesh Kannan ◽  
M Govindaraju ◽  
R Vaira Vignesh
Keyword(s):  
Fly Ash ◽  
Liquid Phase ◽  
Wind Turbines ◽  
Friction Material ◽  
Comprehensive Analysis ◽  
Liquid Phase Sintering ◽  
Brake Pad ◽  
Friction Materials ◽  
Evolution Of Microstructure ◽  
Sintered Materials

Fly ash based sintered materials are identified as potential brake pad materials for wind turbines. However, fly ash based friction materials fabricated through conventional techniques results in more porosity and undesirable tribological properties. This study attempts to develop liquid phase sintering technology for fly ash using Cu as a liquid phase sintering agent. The study presents a comprehensive analysis of the evolution of microstructure, microhardness, and tribological performance of the specimens sintered in Argon and Air environment.

scholarly journals Effects of the brake shoe friction material on the railway wheel damage

2018 ◽  
Vol 149 ◽  
pp. 01090 ◽  
Author(s):  
Abdelmajid Hamdaoui ◽  
El Houcine Jaddi
Keyword(s):  
Wear Rate ◽  
Dynamic Stability ◽  
Friction Material ◽  
Brake Shoe ◽  
Friction Materials ◽  
Railway Wheel ◽  
Railway Vehicles ◽  
Railway Axle ◽  
Critical Components

The wheels of a railway axle are the most critical components of a train. These wheels are subjected to several forms of deterioration, including wear, which significantly influences the safety of traffic as well as the dynamic stability of railway vehicles and the lifetime of wheelsets. The objective of this work is to compare the effect of two friction materials of brake shoes at the damage and the wear rate of the ER8 steel wheels.

Research of Nanometer TiO2/PF Composites and the Properties of Semi-Metallic Friction Material

2013 ◽  
Vol 631-632 ◽  
pp. 239-245 ◽  
Author(s):  
Hua Wei Nie ◽  
Yuan Kang Zhou ◽  
Yang Cao ◽  
Guo Qing Li
Keyword(s):  
Wear Rate ◽  
Friction And Wear ◽  
Phenolic Resin ◽  
Friction Material ◽  
Carbon Residue ◽  
Wear Property ◽  
Friction Materials ◽  
Thermal Analyzer ◽  
Made In ◽  
Metallic Friction

A type of phenolic resin (PF) was prepared by using TiO2 nanoparticles modified with KH-550 as composite filler and modifier, and then the composite modified PF were used as adhesive to prepare semi-metallic friction materials samples. TG analysis of the prepared nano-TiO2 /PF composites was conducted on SETARAM-TG2DSC92216 thermal analyzer that was made in France, and the friction and wear property comparison tests of the samples were carried out on XD-MSM fixed speed friction-wear machine. The results show that the heat resistance of phenolic resin after being compositely modified by TiO2 nanoparticles can be improved, carbon residue rate increases10% at 600°C；the friction coefficient of the corresponding sample slightly increases；the wear rate clearly decreases at high temperature, and wear rate decreases 10% at 350°C.

Research on the Performance Influence of Second Adhesive to Friction Materials

2013 ◽  
Vol 461 ◽  
pp. 415-420
Author(s):  
Jie Peng ◽  
Yu Cheng Liu ◽  
Zhi Feng Yan ◽  
Bao Gang Wang ◽  
Fu Dong Lin ◽  
...  
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Friction Material ◽  
Molten State ◽  
Wear Performance ◽  
Friction Materials ◽  
Low Wear ◽  
The One ◽  
Better Than

The friction materials have many species and they are being used widely, but people have higher requests to friction materials along with the development of technology. the friction material of this expermental optimization formula have the advantages of suitable and stable friction coefficient under high temperature, low wear rate, good restoration characteristics and so on. It can effcetively reduce heat fade of friction and wear under high temperature barking. fricton and wear performance of friction material with second adhesive is better than common preparation friction material , it has higher friction coefficient and lower wear rate, It was determined by physical chemical properities of tin and sulfer. while heating or wearing, the temperature of friction material reach melting temperature of tin, it will become molten state, and sulfer has strong oxidation, on the one hand, tin and sulfer occurred chemical reaction, generating sulfide, stannous (one sulfide tin),on the other hand, while the sulfer is being molten state, it will absorb some abrasive dust, at the same time of generating sulfide, abrasive dust will be adsorb and solidify to pits of friction surface, forming abrasive dust membrane, let the friction coefficient of sample become stable rapidly, reducing the wear rate of friction material.

Study on Friction Properties of Cu-Based Friction Materials with Ni Coated Nano-SiO2 Particles

2010 ◽  
Vol 97-101 ◽  
pp. 1134-1137
Author(s):  
Jian Hua Du ◽  
Jian Guo Han ◽  
Jiang Ping Tu ◽  
Cheng Fa Xu
Keyword(s):  
Powder Metallurgy ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Adhesive Wear ◽  
Optical Microscope ◽  
Friction Material ◽  
Friction Materials ◽  
Friction Tester ◽  
Sio2 Particles ◽  
Nanometer Sio2

The Cu-based friction material with Ni coated nanometer SiO2 (Ni/n-SiO2) particles was prepared by the powder metallurgy technology. Friction properties of the friction materials were evaluated by a friction tester. The microstructure and worn morphology were characterized by optical microscope (OM) and scanning electric microscope (SEM). The results indicate that the microstructure is uniform. The Ni/n-SiO2 particles can enhance the wear ability of Cu-based friction materials. The wear rate of the friction material with Ni/n-SiO2 is 6.58 times of that without Ni/n-SiO2. The main wear mechanisms are abrasive wear and adhesive wear, and Ni/n-SiO2 particles can reduce the abrasive wear and adhesive wear.

Studies on Dynamic Tribology Properties of Friction Materials by Using an Approximate In Situ Observation for Worn Surfaces

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
Weitao Sun ◽  
Wenlong Zhou ◽  
Jianfa Liu ◽  
Xuesong Fu ◽  
Guoqing Chen ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Friction Material ◽  
In Situ Observation ◽  
Friction Materials ◽  
In Situ Method ◽  
Friction Tester ◽  
Tribology Performance ◽  
Worn Surfaces

This paper primarily focused on the dynamic tribology properties of one certain nonasbestos organic (NAO) friction material by using an approximate in situ method. This study was performed through a pad-on-disk type friction tester under different temperature conditions. Results showed that temperature has a significant effect on the dynamic tribology performance. At 100 °C, friction coefficient and wear rate after the running-in stage varied little with time. At 250 °C, friction coefficient after the running-in stage increased gradually and then tended to be stable, while wear rate decreased gradually. From 100 to 350 °C, friction coefficient increased first as a function of temperature, but decreased sharply when the temperature was over 250 °C. Simultaneously, wear rate also increased sharply over 250 °C. Additionally, three dynamic evolution models of worn surfaces corresponding to different cases were established.

scholarly journals EXPERIMENTAL STUDIES ON MECHANICAL, FRICTION AND WEAR OF NON ASBESTOS ORGANIC BRAKE LININGS FOR LIGHT MOTOR VEHICLE

2013 ◽  
pp. 272-280
Author(s):  
M.P. NATARAJAN ◽  
B. RAJMOHAN ◽  
S. DEVARAJULU
Keyword(s):  
Fly Ash ◽  
Friction Coefficient ◽  
Glass Fiber ◽  
Coefficient Of Friction ◽  
Motor Vehicle ◽  
Experimental Studies ◽  
Friction Material ◽  
Wear Loss ◽  
Friction Materials ◽  
Brake Lining

In this study, flyash based non asbestos organic brake lining composition of more than 14 ingredients was investigated to study the effect of ingredients on various behavior of friction properties. Two types of friction materials with different combinations were developed: i) fly ash range (10 %to 60%) and ii) without fly ash based friction materials were investigated to study the effect of ingredients on the friction characteristics and wear. The main focus on the average normal coefficient of friction, hot coefficient of friction (Fade and recovery), wear loss, mechanical, as the function of the relative amount of the ingredient. The results also showed that the friction coefficient of fly ash based friction material was better in the range of 0.35 to 0.48 when compared barites based brake linings in the range of 0.46 to 0.58. The materials such as potassium titanate(terraces), wollastonite, friction dust powder have strongly influence on friction coefficient. The wear résistance of the brake linings was strongly affected by the presence of rock wool calcium hydroxide and zircon silicate. The presence of glass fiber, twaron fiber, glass fiber has increased the strength of the friction material. All these samples were tested on chase type friction tester at automobile ancillary unit.

Effect Multiple Addition (TiO2 and Fly Ash) on Wear Behavior and Hardness of 2024 Al Alloy

2021 ◽  
Vol 1039 ◽  
pp. 201-208
Author(s):  
Ruaa A. Salman ◽  
Naser K. Zedin
Keyword(s):  
Wear Resistance ◽  
Fly Ash ◽  
Wear Rate ◽  
Wear Behavior ◽  
Weight Percent ◽  
Al Alloy ◽  
Sliding Speed ◽  
Multiple Addition

This research is devoted to study the effect of addition (2%) TiO2 with different weight percent of fly ash particulate (0, 2, 4, 6%) to 2024 Al alloy on the wear behavior and hardness. The alloy was fabricated by the liquid metallurgy method. The results founds that the wear rate decreased from 0.55 with 0% fly ash to 0.18 at addition percentage of 6% fly ash. Also, the results reveal increasing the samples wear rate with increasing the load and loaded time. The rate of wear was decreased with increasing the sliding speed. Also, the values of hardness increased from 120VH to 160VH with rising the fly ash from 0% to 6%. Keywords: Fly Ash addition, TiO2, 2024 Al Alloy, Wear Resistance, Hardness.

A Review on Non-Asbestos Friction Materials: Material Composition and Manufacturing

2018 ◽  
Vol 1150 ◽  
pp. 22-42
Author(s):  
Dinesh Shinde ◽  
Kishore N. Mistry ◽  
Suyog Jhavar ◽  
Sunil Pathak
Keyword(s):  
Composite Materials ◽  
Material Properties ◽  
Single Phase ◽  
Friction Material ◽  
Material Surface ◽  
Surface Wear ◽  
Friction Modifier ◽  
Friction Materials ◽  
Morphological Studies ◽  
The Impact

The peculiar feature of friction materials to absorb the kinetic energy of rotating wheels of an automobile to control the speed makes them remarkable in automobile field. The regulation of speed cannot be achieved with the use of single phase material as a friction material. Consequently, the friction material should be comprised of composite materials which consist of several ingredients. Incidentally, the friction materials were formulated with friction modifier, binders, fillers and reinforcements. Due to its pleasant physical properties, asbestos was being used as a filler. Past few decades, it is found that asbestos causes dangerous cancer to its inhaler, which provides a scope its replacement. Several attempts have been made to find an alternative to the hazardous asbestos. The efforts made by different researchers for the impact of every composition of composite friction material in the field are reviewed and studied for their effect on the properties of friction material. Surface morphological studies of different friction material are compared to interpret the concept of surface wear and its correlation with material properties.

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